DE102008005400A1 - Heat exchanger valve device for exhaust gas heat exchanger, has valve housing with inlet for fluid flow and outlet through which larger or smaller liquid flow is guided to heat exchanger - Google Patents

Abstract

The heat exchanger valve device has a valve housing with an inlet for the fluid flow and a heat exchanger outlet through which a larger or smaller liquid flow is guided to the heat exchanger. The valve housing has a by-pass outlet through which an actuator is movable to and fro in the valve housing parallel to its longitudinal axis. The liquid flow is passed over at the heat-exchanger. Independent claims are also included for the following: (1) a method for cleaning heat exchanger valve device (2) an exhaust gas return system.

Description

The The invention relates to a heat transfer valve device for regulating a fluid flow, in particular an exhaust gas or charge air flow, with a valve housing, the one entrance for the fluid flow and a heat exchanger output having, by a heat exchanger, especially a cooler, dependent on from the position of a valve body a more or less big one Fluid flow supplied becomes.

In usual Exhaust systems become an exhaust gas control valve for regulating the exhaust gas flow used. For distributing the exhaust gas, an exhaust valve is used, the exhaust flow either through the radiator or through a bypass past the radiator passes.

task The invention is an improved heat exchanger valve device according to the generic term of claim 1, the simple design and inexpensive to produce is.

The Task is with a heat exchanger valve device for regulating a fluid flow, in particular an exhaust gas or charge air flow, with a valve housing, the one entrance for the fluid flow and a heat exchanger output having, by a heat exchanger, especially a cooler, dependent on from the position of a valve body a more or less big one Fluid flow supplied is solved by that the valve housing has a further output, in particular a bypass output, by the dependent from the position of an actuator having a longitudinal axis and parallel to its longitudinal axis is arranged to be movable in the valve housing, one more or less big Fluid flow to the heat exchanger passed by. According to one essential aspect of the invention are the functions rules and Distributing the fluid flow combined in a single valve device. With the heat exchanger valve device according to the invention Is it possible, the fluid stream entering through the inlet into the valve housing regulated to the heat exchanger outlet or to lead to the bypass output. According to another aspect of the Invention, the input with the valve spool also complete getting closed. The valve spool may also be referred to as a valve body become. The valve spool is controlled by electric actuators, in particular electromagnetic actuator, or by pneumatic actuator, in particular by at least one vacuum box, operated. The conventional Exhaust flap can be omitted.

One preferred embodiment the heat exchanger valve device is characterized in that the actuator between a first Extreme position, in which the further output is closed and the Heat exchanger outlet open is, and a second extreme position is movable back and forth, in which the other output is opened and the heat exchanger output closed is. By the actuator can also at high pressures a sufficient tightness guaranteed become.

One Another preferred embodiment the heat exchanger valve device is characterized in that in a further valve position of the actuator, the other output and the heat exchanger output closed are.

One Another preferred embodiment the heat exchanger valve device is characterized in that in a further valve position of Actuator the other output and the heat exchanger output partially open are.

One Another preferred embodiment the heat exchanger valve device is characterized in that in a further valve position the actuator of the other output and the heat exchanger output are opened.

One Another preferred embodiment the heat exchanger valve device is characterized in that in a further valve position the actuator of the other output in particular partially opened and the heat exchanger output closed is.

One Another preferred embodiment the heat exchanger valve device is characterized in that in a further valve position the actuator of the heat transfer output in particular partially open and the other exit is closed.

One Another preferred embodiment the heat exchanger valve device characterized in that the actuator is a substantially circular cylindrical Includes closing body. The closing body is received in a recess of the valve housing to and fro.

One Another preferred embodiment the heat exchanger valve device is characterized in that the closing body has a central through hole having. The central through hole serves to perform a Piston rod through which the closing body with a drive device is coupled.

Another preferred embodiment of the heat exchanger valve device is there characterized in that the closing body has at least one end face a plurality of projections. The projections extend in the direction of movement of the closing body and serve to guide the closing body in the valve housing.

One Another preferred embodiment the heat exchanger valve device is characterized in that the closing body on both end sides several projections having. As a result, in the extreme positions of the back and forth Movement of the closing body one stable leadership of the closing body in ensured the valve body.

One Another preferred embodiment the heat exchanger valve device is characterized in that the actuator between two spring elements biased to a zero position in which the entrance is closed is. If the actuator is in its zero position, then the connection between the input and the outputs is interrupted by the closing body. By the spring elements allow a fail-safe function.

One Another preferred embodiment the heat exchanger valve device is characterized in that the actuator by a symmetrical prestressed spring is held in the zero position, in which the Entrance is closed.

One Another preferred embodiment the heat exchanger valve device is characterized in that the closing body by two bearing rings guided is. The bearing rings are preferably formed of ceramic and respectively between a shoulder in the valve housing and a retaining ring fixed in the axial direction.

One Another preferred embodiment the heat exchanger valve device is characterized in that the actuator is partially made of ceramic is formed. Stainless steel can also be used instead of ceramics become. The actuator may be partially or completely off Be made of stainless steel.

One Another preferred embodiment the heat exchanger valve device is characterized in that the valve housing partially formed of ceramic is. Preferably, the tread is for the Valve slide made of ceramic.

One Another preferred embodiment the heat exchanger valve device is characterized in that the actuator with a sealing element for the Entrance is equipped. Preferably, the input is with a Sealing seat for equipped the sealing element.

One Another preferred embodiment the heat exchanger valve device is characterized in that the sealing element is an input facing sealing surface having the shape of a spherical section. By using a ball section with a large diameter will shift facilitates the actuator.

One Another preferred embodiment the heat exchanger valve device is characterized in that the sealing element on the actuator guided back and forth is. This will make the closure the entrance with the sealing element, which also serves as a closing element is simplified.

One Another preferred embodiment the heat exchanger valve device is characterized in that the sealing element by a spring device is biased against the entrance. This will close the entrance tightly allows.

One Another preferred embodiment the heat exchanger valve device is characterized in that the actuator is a pressure equalization channel having. As a result, the displacement of the valve spool in the valve housing facilitated.

at a method of cleaning a heat exchanger valve device previously described the above-stated object achieved by the fact that the actuator a zero position along to its longitudinal axis is moved in one and / or in the other direction. Preferably the actuator has essentially the shape of a circular cylinder. Preferably, the cylinder axis corresponds to the longitudinal axis of the actuator. The But actuator can also have a different shape with a longitudinal axis exhibit. The longitudinal axis corresponds to the direction of the longitudinal extent of the actuator.

One preferred embodiment of the method is characterized in that an exhaust gas recirculation line the heat exchanger valve device while the cleaning process is closed in the zero position. Preferably is the exhaust gas recirculation line to a housing the heat exchanger valve device connected. The exhaust gas recirculation line But also, at least partially, in one piece with the housing of the heat-exchanger accomplished be.

A further preferred embodiment of the method is characterized in that the exhaust gas recirculation line or two exhaust gas return guide lines of the heat exchanger valve device remains closed during the cleaning process or remain. The actuator is moved from its zero position only limited back and forth.

One Another preferred embodiment of the method is characterized in that the actuator a starting position along to its longitudinal axis is moved in one and / or in the other direction. By the Moving the actuator become deposited particles or deposited Condensate scraped off or peeled off.

One Another preferred embodiment of the method is characterized in that an exhaust gas recirculation line the heat exchanger valve device while the cleaning process to a heat exchanger and / or to a Bypass or the other output is opened. This leads Actuator larger movements out as if the exhaust gas recirculation line remains closed.

One Another preferred embodiment of the method is characterized in that the actuator to its longitudinal axis is set in rotation. It is possible to clean only by one To realize rotational movement of the actuator. Preferably, the However, rotational movement with a longitudinal movement combined.

One Another preferred embodiment of the method is characterized in that the rotation is alternating in one direction or the other. It is possible the To vary the angle of rotation during cleaning.

One Another preferred embodiment of the method is characterized in that the rotation only in one direction. This simplifies the drive.

One Another preferred embodiment of the method is characterized in that the longitudinal movement of the actuator combined with the rotary motion of the actuator becomes. This allows a particularly effective cleaning possible.

One Another preferred embodiment of the method is characterized in that the actuator at the longitudinal movement, repeated several times, a maximum possible Hub or a percentage of the maximum possible stroke in one direction carries and returns to its original position.

One Another preferred embodiment of the method is characterized in that the actuator at the longitudinal movement, repeated several times, a maximum possible Hub or a percentage of the maximum possible hub in the other Direction and returns to its original position.

One Another preferred embodiment of the method is characterized in that the actuator at the longitudinal movement, repeated several times, a maximum possible Hub or a percentage of the maximum possible stroke in both directions carries and returns to its original position. The size or the percentage of the stroke can be varied during cleaning.

One Another preferred embodiment of the method is characterized in that the adjustment speed when cleaning slower, faster or as fast as the adjustment speed under normal conditions is. The adjustment speed can during Cleaning can also be varied.

One Another preferred embodiment of the method is characterized in that by a drive the heat exchanger valve device a higher one for a short time Adjusting force is applied as under normal conditions. Thereby can caused by pollution, possibly higher friction or Resistance forces overcome become.

One Another preferred embodiment of the method is characterized in that the cleaning at following operating states of a Internal combustion engine takes place: In a diesel combustion process before commissioning of the internal combustion engine or in the preheating phase; in an Otto combustion process and / or a diesel combustion process before commissioning of the internal combustion engine, for example, during commissioning a fuel pump and / or other accessories; at / to Stopping the internal combustion engine; during operation of the internal combustion engine, with the internal combustion engine in an operating point, in which no exhaust gas recirculation takes place.

This is particularly possible with specially designed actuators of exhaust gas recirculation valves that allow movement of the actuator without opening the valve seat, such as a piston valve, possible. For this purpose, in particular the previously described cleaning mechanism is suitable, in which the actuator moves so that the valve remains closed anyway. In addition, the cleaning can take place during the operation of the internal combustion engine, wherein the internal combustion engine is in an operating point, in the Ab gas recirculation takes place. This is particularly possible with specially designed actuators of exhaust gas recirculation valves, which allow a rotational movement of the actuator, such as a piston valve.

One Another preferred embodiment of the method is characterized in that the initiation the cleaning mechanism is such that a cleaning takes place at predetermined intervals. The intervals can be temporal Be nature or from the operating time of the engine or the mileage depend on the vehicle. The cleaning can also at every startup and shutdown of the internal combustion engine occur. According to one another embodiment is carried out a cleaning, if the deviation of a sensor signal of a bearing feedback of the Drive of the heat exchanger valve device (ACTUAL position) for a given electrical drive signal (DESIRED position) greater than for example 3 percent. According to one another embodiment becomes a possible Contamination due to a deviation of a sensor signal of the position feedback the drive of the heat exchanger valve device for a given electrical drive signal from a stored (unpolluted) sensor signal at selbigem control signal detected and initiated a cleaning. The cleaning can also be through a combination the mechanisms described above are initiated.

The previously described inventive cleaning method has the advantage, among other things, that it does not affect driving behavior the vehicle has, if the cleaning mechanism before starting or after switching off the internal combustion engine, or if the cleaning mechanism during operation but without an opening the heat exchanger valve device he follows.

One Another preferred embodiment of the method is characterized in that the position of the valve spool is detected by means of a sensor device. A possible pollution the valve spool is preferably by a deviation of a detected by the sensor device sensor signal of the bearing feedback a Drive device of the valve spool detected.

One Another preferred embodiment of the method is characterized in that one of the sensor device detected sensor signal is compared with a reference signal. at the reference signal is preferably an electrical one Control signal of the drive device of the valve spool.

The The invention also relates to an exhaust gas recirculation system on or with a Internal combustion engine, in particular a motor, the or the branched off at a sampling point and returned via a return point exhaust is supplied. The above object is achieved in the exhaust gas recirculation system in that between the sampling point and the return point a previously described heat-exchanger is switched.

One preferred embodiment the exhaust gas recirculation system characterized in that the heat exchanger valve means with an exhaust gas cooling device connected is. The exhaust gas cooling device serves to the temperature of the recirculated exhaust gas lower. The heat exchanger valve device can cohesively or mechanically to the exhaust gas cooling device be connected.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the heat exchanger valve device in the exhaust gas cooling device is integrated. It is advantageous, for example, if the housing or the downstream side the heat exchanger valve device directly the inlet or outlet diffuser of the exhaust gas cooling device forms.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the heat exchanger valve means cohesively with the exhaust gas cooling device connected is. Alternatively, the heat exchanger valve device mechanically, z. B. by screws, positive engagement, etc., with the exhaust gas cooling device be connected.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the heat exchanger valve means a Bypass has as another output. The bypass serves to Example of a cold start of the engine, the recirculated exhaust gas uncooled at the Exhaust gas cooling device pass route.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the exhaust gas cooling device comprises a U-flow cooler. The U-flow cooler is so to the heat exchanger valve device connected that the recirculated exhaust gas for one uncooled on the radiator passing through the heat exchanger valve device can be directed. On the other hand, the recirculated exhaust gas by means of the heat exchanger valve device through the U-flow cooler passed and so cooled be returned. The U-flow cooler provides the advantage that a bypass can be omitted.

Another preferred embodiment play the exhaust gas recirculation system is characterized in that the heat exchanger valve device, viewed in the flow direction from the sampling point to the return point, upstream or downstream of the exhaust gas cooling device is arranged. The heat exchanger valve device can therefore be arranged both in front of and behind the exhaust gas cooling device.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the heat exchanger valve means a High-temperature exhaust gas cooler and a low temperature exhaust gas cooler. Depending on the application can the two-stage cooling be beneficial.

One Another preferred embodiment the exhaust gas recirculation system characterized in that the heat exchanger valve means, in the flow direction from the sampling point to the recycling point considered, upstream or downstream to the high-temperature exhaust gas cooler or the low temperature exhaust gas cooler is arranged. The heat exchanger valve device can therefore before or after the high-temperature exhaust gas cooler or Low-temperature exhaust gas cooler arranged be. The heat exchanger valve device But also between the high-temperature exhaust gas cooler and the low temperature exhaust gas cooler be arranged.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the exhaust gas recirculation system of a high-pressure exhaust gas recirculation system is formed. The high-pressure exhaust gas recirculation system can with a single-stage or with a two-stage cooling be equipped.

One Another preferred embodiment the exhaust gas recirculation system is characterized in that the exhaust gas recirculation system of a low pressure exhaust gas recirculation system is formed. The low-pressure exhaust gas recirculation system can be equipped with a single-stage or with a two-stage cooling be equipped.

In another embodiment are in the method of cleaning, in particular the heat transfer valve device, the heat exchanger output and the bypass outlet closed. In particular, during the Cleaning process no medium, in particular no exhaust gas or no charge air, through the heat exchanger outlet the heat exchanger and over the bypass output to be fed to the bypass.

In another embodiment are in the method of cleaning, in particular the heat transfer valve device, the heat exchanger output or the bypass outlet is closed. In particular, during the Cleaning process no medium, especially no exhaust gas or none Charge air, through the heat exchanger output the Heat exchanger or over the bypass output to be fed to the bypass.

In another embodiment is used in the method for cleaning, in particular the heat transfer valve device, the method of cleaning is started as soon as a detected sensor signal a sensor device, in particular for measuring a Reibwiderstandskraft a frictional resistance between at least one closing body and at least one housing guide portion, with corresponds to a reference signal.

Especially, when the sensor signal exceeds the reference signal and / or falls below or matches with this, the procedure for cleaning can be started. Especially, when the sensor signal a second other reference signal over and / or falls below or coincides with this, the process for cleaning can be ended.

The Invention also relates to a heat exchanger, in particular an exhaust gas heat exchanger, with a heat exchanger valve device described above.

Further Advantages, features and details of the invention will become apparent the following description, with reference to the drawing an embodiment is described in detail. It can in the claims and mentioned in the description Features individually for each itself or in any combination essential to the invention. It demonstrate:

1 a high-pressure exhaust gas recirculation system with a single-stage cooling, which includes a bypass;

2 a high-pressure exhaust gas recirculation system with one-stage cooling with a U-flow cooler;

3 a high-pressure exhaust gas recirculation system with a two-stage cooling;

4 a low-pressure exhaust gas recirculation system with a one-stage cooling, which includes a bypass;

5 a low-pressure exhaust gas recirculation system with one-stage cooling with a U-flow cooler;

6 a low-pressure exhaust gas recirculation system with a two-stage cooling;

7 a heat exchanger valve device according to the invention in longitudinal section;

8th the view of a section along the line II-II in 1 ;

9 a heat transfer valve device according to a werteren embodiment in longitudinal section;

10 a heat exchanger valve device according to a further embodiment in longitudinal section through the valve spool;

11 a closing body of the valve spool of the heat exchanger valve device 10 according to a first embodiment;

12 a side view of the closing body 11 ;

13 a similar closing body as in 11 according to a further embodiment;

14 a side view of the closing body 13 ;

15 a similar closing body as in the 11 and 13 according to a further embodiment;

16 a side view of the closing body 15 .

17 a heat exchanger valve device according to another embodiment in longitudinal section through the valve spool and

18 a heat exchanger valve device according to another embodiment in longitudinal section through the valve spool.

In the 1 to 3 Various embodiments of a high-pressure exhaust gas recirculation system are shown simplified. Identical parts are provided with the same reference numerals. The performance of an internal combustion engine depends on displacement, speed and average gas pressure. By charging the engine, the filling can be significantly improved and thus the engine power can be increased. The fuel-air mixture or the air is completely or partially pre-compressed outside the cylinder. In an exhaust turbocharged engine, the exhaust gases drive the turbine and the compressor. The compressor takes over the intake and delivers a pre-compressed fresh gas charge to the engine. An intercooler in the charging line dissipates the heat of compression to the ambient air. As a result, the cylinder filling is further improved.

The Exhaust gas recirculation is used to the exhaust as possible far to cool. The recirculated exhaust gas does not take part in the combustion in the internal combustion engine, heated but. Overall, the recirculated exhaust gas temperature in lowered the internal combustion engine or the engine. By low temperatures in the engine can cause the formation of nitrogen oxides, which is highly dependent on the temperature in the engine can be reduced.

The fuel-air mixture is via an air filter 101 from a compressor 102 sucked and a motor 104 fed. From the engine 104 the exhaust gas reaches a turbine 106 that the compressor 102 drives. Between the engine 104 and the turbine 106 , which is also referred to as turbocharger turbine, is a sampling point 108 provided with a return station 109 communicates. About the return site 109 the exhaust gas is returned to the engine 104 fed. Between the sampling point 108 and the return site 109 is a heat transfer valve according to the invention 111 , which is also referred to as a combination valve arranged. The combination valve 111 stands with an exhaust gas cooler 112 in conjunction, which includes a bypass. This bypass is made in one piece with the radiator housing. In another embodiment, not shown, the bypass is in particular a separate pipeline which bypasses the radiator. Between the compressors 102 and the return site 109 is a charge air cooler 114 connected.

The in the 2 and 3 shown high-pressure exhaust gas recirculation systems are similar to the 1 illustrated exhaust gas recirculation system. To designate the same parts, the same reference numerals are used. To avoid repetition, the preceding description of the 1 directed. In the following, only the differences between the individual embodiments will be discussed.

At the in 2 shown high-pressure exhaust gas recirculation system is between the sampling point 108 and the return site 109 an inventive heat transfer valve 121 switched, which is also referred to as a combination valve. The combination valve 121 communicates with a U-flow cooler. Depending on the switching position of the combination valve 121 the recirculated exhaust gas passes either directly through the combination valve 121 uncooled from the sampling point 108 to the return site 109 , or the recirculated exhaust gas is by means of the combination valve in the U-flow cooler 122 passed in the U-flow cooler 122 cooled and then passes only to the return point 109 ,

At the in 3 shown high-pressure exhaust gas recirculation system is between the sampling point 108 and the return site 109 a combination valve 131 arranged with a two-stage cooling device, which is a high-temperature exhaust gas cooler 132 and a low temperature exhaust gas cooler 133 includes.

In the 4 to 6 Various embodiments of a low-pressure exhaust gas recirculation system are shown simplified. The fuel-air mixture is via an air filter 101 from a compressor 102 sucked and a motor 104 fed. The exhaust of the engine 104 is in a turbine 106 relaxes the compressor 102 drives. Downstream of the turbine 106 is a sampling point 108 arranged with a return point 109 communicates. The return site 109 is upstream of the compressor 102 arranged. Between the compressors 102 and the engine 104 is a charge air cooler 114 connected. Between the turbine 106 and the sampling point 108 is a diesel particulate filter 140 switched with oxidation catalyst. Between the sampling point 108 and the return site 109 is a heat transfer valve 141 , which is also referred to as a combination valve, switched. The combination valve 141 stands with an exhaust gas cooler 142 in conjunction, which is equipped with a bypass. Between the exhaust gas cooler 142 and the return site 109 is a condensate separator 144 connected. In the flow direction following the extraction point 108 is an exhaust back pressure valve 145 arranged. Between the return point 109 and the air filter 101 is a charge air throttle 147 connected.

In the 5 and 6 are similar low-pressure exhaust gas recirculation systems as in 4 shown. To designate the same parts, the same reference numerals are used. To avoid repetition, the preceding description of the 4 directed. In the following, only the differences between the individual embodiments will be discussed.

At the in 5 illustrated embodiment is between the sampling point 108 and the return site 109 a heat transfer valve 151 , which is also referred to as a combination valve, switched. The combination valve 151 stands with a U-flow cooler 152 in connection. Depending on the switching position of the combination valve 151 the recirculated exhaust gas passes either directly through the combination valve 151 uncooled from the sampling point 108 to the return site 109 , or the recirculated exhaust gas is by means of the combination valve in the U-flow cooler 152 passed in the U-flow cooler 152 cooled and then passes only to the return point 109 ,

At the in 6 illustrated embodiment are between the sampling point 108 and the return site 109 a combination valve 161 arranged with a two-stage cooling device, which is a high-temperature exhaust gas cooler 162 and a low temperature exhaust gas cooler 163 includes.

In the 7 and 8th is a heat exchanger valve device according to the invention 1 shown in different views. The heat exchanger valve device 1 includes a housing 2 with an entrance 4 for a fluid. The fluid is preferably exhaust gas or charge air. The entrance 4 is from an inlet nozzle 5 formed substantially in the shape of a circular cylinder jacket, which is integral with the housing 2 , which is also referred to as a valve housing, is connected and a circular inlet opening 6 includes.

Furthermore, the valve housing 2 a radiator outlet opening 10 in a cooler outlet 11 which communicates with a radiator (not shown). In addition, the valve housing has 2 a bypass output 12 which communicates with a bypass line (not shown) through which fluid is directed past the radiator. The cooler output 11 is from a radiator outlet 13 formed, which is integral with the valve body 2 is formed and widens outwardly funnel-shaped. The bypass output 12 is from a bypass outlet 14 formed, which is integral with the valve body 2 is formed and a bypass outlet opening 15 having. The respective cross sections of the lines are the same size. This leads to a smaller adjustment, since the exit area can be smaller in diameter. Preferably, the adjustment paths are the same. The result is that the outlet has a diameter twice as large as the inlet and thus has four times the area.

In the valve housing 2 is a valve spool 16 guided back and forth. The valve spool 16 has a valve slide rod 18 on, at one end of a closing body 20 is trained. In the closing body 20 is a pressure equalization hole 22 provided, which allows a pressure equalization when the closing body 20 in the valve housing 2 in the direction of a double arrow 23 is moved back and forth. On the closing body 20 is a sealing element 24 that is a sealing sleeve 25 includes, perpendicular to the double arrow 23 guided back and forth. On his the closing body 20 opposite side has the sealing element 24 a sealing surface 26 on, through which the inlet opening 6 of the entrance 4 is closed for the fluid. The sealing sleeve 25 is in an annulus 28 that in the closing body 20 is recessed, guided back and forth. The annulus 28 becomes radially inward from a substantially circular cylindrical projection 29 limited. The entrance 4 facing end face of the projection 29 forms a stop for the sealing element 24 , Also, in the annulus 28 a helical compression spring 30 provided by which the sealing element 24 with its sealing surface 26 against the entrance opening 6 of the entrance 4 is biased for the fluid.

The valve housing 2 is through a valve housing cover 32 closed, a guide neck 34 having. Through the guide neck 34 extends the valve spool rod 18 from the valve body 2 outward. Via the valve slide rod 18 can the closing body 20 in the valve housing 2 in the direction of the double arrow 23 be moved back and forth.

In the in 7 shown position of the closing body 20 is the entrance opening 6 through the sealing surface 26 of the sealing element 24 locked. The radiator outlet opening 10 and the bypass exit opening 15 are through the closing body 20 locked. When the closing body 20 to the valve housing cover 32 is moved, then both the inlet opening 6 as well as the radiator outlet opening 10 opened, leaving fluid from the entrance 5 to the radiator outlet 11 arrives. The size of the passage cross section for the fluid depends on the position of the closing body 20 in the valve housing 2 from. When the closing body 20 from the in 1 shown position of the valve housing cover 32 is moved away, then both the inlet opening 6 as well as the bypass exit opening 15 open.

By the heat exchanger valve device according to the invention will easily distribute and regulate the distribution Fluid streams, in particular of exhaust gas streams or charge air streams, ensured with high density. The heat exchanger valve device according to the invention has the advantage that only one actuator is needed. Furthermore has the heat exchanger valve device according to the invention economical producible components that are less prone to contamination. The closing body is preferably formed of ceramic and preferably runs in a precise fit, to keep the adjustment of the actuator as small as possible. The Environment, which is the tread for the Sealing element or the closing body represents, can also be formed of ceramic. Instead of ceramics can also be stainless steel be used. about the area of the sealing of the inlet opening of the closing body, for example a straight shape. The area after the start of the move is in the exhaust stream, preferably has a shape that a gradually Connecting the exhaust gas flow into the appropriate branch he allows, for example the shape of a sphere that makes it possible first To generate a high pressure loss, for example, to achieve a low return rate necessary is.

The helical compression spring 30 is preferably dimensioned so that the inlet back pressure is overcome by the spring force and the valve device closes tightly under these conditions. Instead of the helical compression spring and a bellows can be used which has a similar spring characteristic as the spring. Such a bellows has advantageously for pressure relief, for example in the middle, an opening. In order to ensure a constant cross section in the flow, it may be advantageous that the annular inlet into the heat exchanger only has a diameter larger by a factor of 1.41 than the entrance from the exhaust side to divide the flow between the bypass and the radiator. This space can be saved.

In 9 a heat exchanger valve device according to a further embodiment is shown in longitudinal section. In the 9 illustrated heat exchanger valve device is similar to the in 7 illustrated heat exchanger valve device. To designate the same parts, the same reference numerals are used. To avoid repetition, the preceding description of the 7 refer. In the following, only the differences between the two embodiments will be discussed.

At the in 9 illustrated embodiment is a bellows as a sealing element 41 used. The bellows 41 has an end 43 on that over the entire circumference of the bellows to the closing body 20 is welded. The other end 45 the bellows 41 lies at the circular inlet 6 at. The use of the bellows 41 provides the advantage that the bellows open at one end 41 inside is pressurized. As a result, the spring load can be lower.

In 10 is a heat transfer valve device 51 illustrated according to another embodiment. The heat exchanger valve device 51 includes a housing 52 with an entrance 54 for a fluid. The fluid is preferably exhaust gas or charge air. The entrance 54 is from an inlet nozzle 55 formed substantially in the shape of a circular cylinder jacket, which is integral with the housing 52 , which is also referred to as a valve housing, is connected and a circular inlet opening 56 includes. The entrance opening 56 opposite is in the valve housing 52 a recess 58 recessed whose function will be explained later.

Furthermore, the valve housing 52 a radiator outlet opening 60 in a cooler outlet 61 which communicates with a radiator (not shown). In addition, the valve housing has 52 a bypass output 62 which is in communication with a bypass line (not shown) through which fluid is conducted past the radiator. The cooler output 61 is from a radiator outlet 63 formed, which is integral with the valve body 52 connected is. The bypass output 62 is from a bypass outlet 64 formed, which is also integral with the valve housing 52 connected and a bypass exit opening 65 having. The respective cross sections of the lines are the same size.

In the valve housing 52 is a valve spool 66 guided back and forth. The valve spool 66 includes a valve spool rod 68 , at one end of a closing body 70 is attached. Through the entrance opening 56 opposite recess 58 in the valve housing 52 is ensured that the closing body 70 in the circumferential direction completely from that in the entrance 54 existing medium is flowed around. By a double arrow 69 is the float of the closing body 70 hinted that the valve slide rod 68 , which may also be referred to as a piston rod, from a (not shown) drive means on the closing body 70 is transmitted, which is also referred to as a piston. Depending on the position of the closing body 70 is the entrance 54 with the radiator outlet 61 or the bypass output 62 connectable. In the in 10 shown position of the closing body 70 there is no connection between the input 54 and the outputs 61 . 62 ,

In the 11 and 12 is the closing body 70 shown in different views. The closing body 70 includes a main body 71 which has the shape of a right circular cylinder. At its end faces is the main body 71 each with a circumferential rounding 73 . 74 Mistake. In addition, the main body points 71 a central through hole 75 on. At the ends of the through hole 75 is a chamfer 76 . 77 intended.

In the 13 and 14 is a closing body 80 represented according to another embodiment in different views. The closing body 80 includes a main body 81 which has the shape of a right circular cylinder. An end face of the main body 81 is with a circumferential rounding 83 Mistake. The rounding 83 has the shape of an elliptical arc in cross-section. In the main body 81 is a central through hole 85 spared. The ends of the through hole 85 are each with a chamfer 86 . 87 Mistake. At the end of the through hole 85 with the chamfer 87 are at the associated end face of the body 81 two projections 88 . 89 formed, extending in the axial direction of the body 81 extend. The projections 88 . 89 are bounded radially inward and radially outward by circular arcs. The radially outer arc of the projections 88 . 89 has the same radius as the main body 81 , The projections 88 . 89 serve to guide the closing body 80 in the valve housing to improve.

In the 15 and 16 is a closing body 90 represented according to another embodiment in different views. The closing body 90 includes a main body 91 which has the shape of a right circular cylinder. In the main body 91 is a central through hole 95 recessed, which at the ends in each case a chamfer 96 . 97 having. At both ends of the body 91 are each three projections 201 . 202 . 203 ; 204 . 205 educated. The projections 201 to 205 have the same shape as the protrusions 88 . 89 at the in 14 illustrated embodiment and also serve for better management of the closing body 90 in the valve housing. The projections 201 to 203 and 204 to 205 are about the circumference of the closing body 90 arranged evenly distributed at the end faces.

The accumulated under the given operating conditions of an exhaust gas recirculation system particle and Kondensatablagerungen the valve spool of the heat exchanger valve device, the function of the heat exchanger valve device, which is referred to as a valve, influence. According to an essential aspect of the invention, in a motor vehicle operated with a diesel combustion method, a cleaning process or a cleaning mechanism is carried out before the engine is put into operation or in the pre-glow phase. In a vehicle operated according to the Otto combustion method, this cleaning method or this cleaning mechanism should also take place before the engine is put into operation, for example when the fuel pump and / or other ancillary units are put into operation. Here, the actuator of the heat exchanger valve device, in particular the valve spool with the closing body, once or several times to be moved back and forth and then back to the starting position in which the valve is closed, return. By this method of the actuator deposited particles or deposited condensate are scraped off or peeled off. This ensures proper operation of the vehicle during operation. The cleaning mechanism or the cleaning method can or can also during or after parking of the engine.

at specially executed Actuators that move the actuator without opening the valve seat allow, that is without a gas flow to allow, as for example in a previously described valve spool, can the cleaning mechanism or the cleaning process even while the operation of the engine take the form that at engine operating conditions, in which no exhaust gas recirculation takes place, the actuator is so oscillating or vibrating, that the valve still remains closed.

The Initiation of the cleaning mechanism is preferably the shape, that a possible pollution by a deviation of a sensor signal of the bearing feedback a drive device of the heat exchanger valve device for a given electrical drive signal from a stored Sensor signal is detected at selbigem drive signal. Depending on the operating condition The vehicle is then one of the two previously described Cleaning mechanisms or cleaning process performed.

at both cleaning mechanisms or cleaning methods is a repetitive deflection of the closing body from the zero position or Starting position in one and then beyond the zero position in the other direction reaches a cleaning. The deflection path depends on vehicle-specific aspects, in particular the interpretation the exhaust gas recirculation, from. ever according to size of the closing body is the deflection path only a certain percentage of the maximum possible deflection. In which However, the former cleaning mechanism, it is essential that the closing body, the Also referred to as a piston, the one or the other opening at least partially free. In the second cleaning method described above or cleaning mechanism, it is essential that the valve piston or valve closing body the two openings always kept closed.

The Adjustment speed can be slower, faster when cleaning or equal to the speed of the closing body under normal conditions. It is crucial that the electric drive of the closing body briefly a higher Displacement force can apply as under normal conditions to by Pollution caused, possibly higher friction or resistance forces to overcome.

In 17 is a heat transfer valve device 211 illustrated according to another embodiment. The heat exchanger valve device 211 includes a housing 212 with an entrance 214 for a fluid. The fluid is preferably exhaust gas or charge air. The entrance 214 is from an inlet nozzle 215 formed substantially in the shape of a circular cylinder jacket, which is integral with the housing 212 , which is also referred to as a valve housing, is connected and an inlet opening 216 includes. At the entrance 216 the entrance opens 214 in an annulus 218 ,

Furthermore, the valve housing 212 a radiator outlet opening 220 in a cooler outlet 221 which communicates with a radiator (not shown). In addition, the valve housing has 212 a bypass output 222 which is in communication with a bypass line (not shown) through which fluid is conducted past the radiator. The cooler output 221 is from a radiator outlet 223 formed, which is integral with the valve body 212 connected is. The bypass output 222 is from a bypass outlet 224 formed, which is also integral with the valve housing 212 connected and a bypass exit opening 225 having. The cooler output 221 has a larger cross-section than the bypass outlet 222 on.

In the valve housing 212 is a valve piston or valve spool 226 guided back and forth, as by a double arrow 229 is indicated. The valve spool 226 includes a valve piston rod 228 , at one end of a closing body 230 is attached. The annulus 218 surrounds the closing body 230 , Through the annulus 218 is ensured that the closing body 230 in the circumferential direction completely from that in the entrance 214 existing medium or fluid is flowed around. The closing body 230 is via the valve spool rod or valve piston rod 228 driven by a (not shown) drive means. Depending on the position of the closing body 230 is the entrance 214 with the radiator outlet 221 or the bypass output 222 connected. In the in 17 shown position of the closing body 230 there is no connection between the input 214 and the outputs 221 . 222 , This position of the closing body 230 is also called zero position.

The closing body 230 has the shape of a straight circular cylinder whose end faces each provided with a circumferential rounding. At the front sides of the closing body 230 are each three projections 231 . 232 ; 233 . 234 formed, extending in the axial direction of the closing body 230 extend and of which in 17 only two projections per face are visible. The projections 231 to 234 serve to guide the closing body 230 in the valve housing 212 to improve, when the closing body 230 from the in 17 shown zero position is moved to the right or left. In addition, the projections allow 231 to 234 the passage of medium or fluid from the entrance 214 to the exits 221 . 222 when the closing body 230 is moved to the right or left.

Between the right front side of the closing body 230 and the valve housing 212 is a spring 236 clamped. One end of the spring 236 lies on the associated end face of the closing body 230 at. The other end of the spring 236 , which is designed as a helical compression spring, is in a recess 237 in the case 212 added. The other end, that is in 17 the left end, the closing body 230 is through another spring 239 acted upon, which is also designed as a helical compression spring. The helical compression spring 239 is between the closing body 230 and the valve housing 212 or a plain bearing bush 250 clamped, whose function will be explained below. The feathers 236 and 239 have the same spring characteristic and cause an equally large but acting in the opposite direction biasing force on the closing body 230 , Due to the preload forces of the springs 236 . 239 becomes the closing body 230 in his in 17 biased zero position shown biased. This bias in the zero position ensures a fail-safe function. If, for example, the drive via the valve spool 226 fails, then by the springs 236 . 239 caused bias ensures that the closing body 230 the entrance 214 closes.

The valve housing 212 is in the range of the valve piston rod or valve slide rod 228 through a housing cover 241 locked. Between the housing cover 241 and the valve housing 212 is a seal 242 clamped. The housing cover 241 is with the help of screws 243 . 244 on the valve body 212 attached. In addition, the housing cover 241 a bearing neck 248 on, through which the valve slide rod 228 extends through. The valve spool rod 228 is with the help of plain bearing bush 250 in the bearing neck 248 stored. The plain bearing bush 250 allows the valve slide rod 228 with the closing body 230 in the valve housing 212 moved back and forth, as by the double arrow 229 is indicated. Through a sealing ring 252 holding the valve spool rod 228 at the end of the bearing neck 248 surrounds, the interior of the housing 212 sealed.

The closing body 230 is in two bearing rings 261 . 262 made of ceramic slidably mounted in the axial direction. The bearing ring 261 is in the axial direction between a paragraph 264 and a circlip 265 , which is designed as a snap ring, fixed. The bearing rings 261 . 262 each have a rectangular cross-section. The circlip 265 also has a rectangular cross-section. The bearing ring 262 is in the axial direction between a paragraph 267 and a circlip 268 fixed, which is designed as a snap ring and has a circular cross-section.

In 18 is a heat transfer valve device 300 illustrated according to another embodiment. Identical features are denoted by the same reference numerals as in the previous figures. In particular, unlike 17 has the heat transfer valve device 300 at least one spring 303 on, which is designed as a helical compression spring and / or Schraubenzugfeder. The valve piston or the valve stem 301 is essentially like the valve piston or the valve stem 226 educated. The heat exchanger valve device 300 includes a closing body 302 Essentially like the closing body 230 is trained. On the valve piston rod 228 At least one cleaning sleeve is arranged for cleaning and / or lubrication of the piston rod 228 , The housing 212 is designed in particular as a cast housing.

10 . 17 and 18

The valve spool 66 . 226 . 301 is formed as a solid body or at least partially as a hollow body.

In the 1 - 18 In another embodiment, the heat transfer valve device, in particular the housing 2 . 52 . 212 and / or the valve spool 16 . 66 . 226 and / or in particular the closing body of a metal and / or of a sintered material such as ceramic and / or magnesium and / or aluminum and / or steel, such as stainless steel, and / or of a plastic, in particular a plastic whose melting temperature is higher as the temperature of the medium to be cooled, in particular the exhaust gas, the charge air, the oil, etc., and / or formed from a fiber composite material.

The at least one housing 2 . 52 . 212 For example, is formed of at least one sheet and has a material, in particular aluminum or an aluminum alloy, plastic, ceramic or a fiber composite material or steel whose melting temperature above, in particular well above, the temperature of the medium to be cooled, such as exhaust gas, charge air, oil, coolant etc. is located. The at least one housing 2 . 52 . 212 is provided with at least one coolant channel, in particular with two, three or more than three coolant channels, in which coolant such as a water-containing fluid and / or a gas such as air or CO2 flows and that at least one housing 2 . 52 . 212 cools particularly advantageous, in particular below the melting temperature of the material, in particular aluminum or aluminum alloy, plastic, magnesium, ceramic or fiber composite material or steel, cools, so that the strength properties such as stiffness, tensile and / or compressive strength, fatigue strength, alternating strength of the at least one housing 2 . 52 . 212 not be degraded by the temperature of the uncooled medium such as exhaust gas, charge air, oil, coolant.

The housing 2 . 52 . 212 is produced by means of a primary manufacturing process, such as casting, injection molding, etc., and / or by means of a forming manufacturing process, such as bending, pressing, stamping and / or by means of material bonding, such as welding, soldering, gluing, etc.

Of the Closing body, in particular the piston, does not have a closer designated piston diameter. Furthermore, the guide section to the leadership of the closing body, in particular of the piston, a guide section diameter the guide opening. The double slit width he gives himself in the subtraction of the piston diameter from the guide section diameter.

The following values are in microns:
The gap width assumes in particular values between 10 μm to 55 μm, in particular between 15 μm to 50 μm, in particular between 20 μm to 40 μm, in particular 30 μm to 35 μm. The gap width in particular assumes values between 5 μm to 55 μm, in particular between 8 μm to 25 μm, in particular between 10 μm to 15 μm.

The at least one helical compression and / or Schraubenzugfeder 236 . 239 . 303 , in particular the two or more than two helical compression and / or Schraubenzugfedern 236 . 239 . 303 Close the valve when de-energized. In the at least one helical compression and / or Schraubenzugfeder 236 . 239 . 303 , in particular the two or more helical compression springs and / or Schraubenzugfedern 236 . 239 . 303 , are preferably coil springs.

The at least one helical compression and / or Schraubenzugfeder 236 . 239 . 303 , in particular the two or more than two helical compression and / or Schraubenzugfedern 236 . 239 . 303 , are arranged in the gas space or outside the gas space. The at least one helical compression and / or Schraubenzugfeder 236 . 239 . 303 , in particular the two or more than two helical compression and / or Schraubenzugfedern 236 . 239 . 303 are arranged in another embodiment in the drive unit.

The at least one valve spool 226 is relieved of pressure in the closed position, in this way, a lower force for actuating the valve spool is required as known from the prior art. In particular, the size of the drive unit can be reduced and in this way space can be advantageously saved. The drive unit used is at least one DC motor (DC direct current direct current) and in another embodiment a brushless DC motor and / or at least one rotary magnet and / or at least one linear drive, in particular at least one linear direct drive and / or at least one lifting magnet.

The heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 is at least one combination valve, so that in particular the exhaust gas recirculation (exhaust gas recirculation function) of recycled, cooled or cooled medium such as exhaust gas, charge air, coolant, oil, etc. and a bypass (bypass function) of medium such as exhaust gas, charge air, coolant, oil, etc. the at least one cooler, so that the medium such as exhaust gas, charge air, coolant, oil, etc. is not cooled with the heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 controlled and / or regulated.

The heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 is in another embodiment, only one exhaust gas recirculation valve, so that in particular the exhaust gas recirculation (exhaust gas recirculation function) is controlled by recirculated, cooled or cooled medium such as exhaust gas, charge air, coolant, oil, etc. and / or regulated. The heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 is relieved of pressure in the closed position.

The heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 is in another embodiment, only a bypass valve (bypass function). Returned, cooled or to be cooled medium such as exhaust gas, charge air, coolant, oil, etc. is bypassed around the at least one radiator, so that the medium such as exhaust gas, charge air, coolant, oil, etc. is not cooled. With the heat transfer valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 is particularly advantageous reduces the leakage. Namely, in the prior art, a leakage current flows to medium such as exhaust gas, charge air, coolant, oil in bypassing (bypass function) due to the poor seal by the radiator or the cooling function by the bypass. This leakage current is when using the heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 As a bypass valve is particularly advantageous reduced, so that the leakage current only 0.5% to 10%, in particular 0.5% to 7%, in particular 0.5% to 5%, in particular 0.5% to 3%, in particular 0.5% to 2% of the in the heat exchanger valve device 11 . 121 . 131 . 141 . 151 . 161 . 211 . 300 inflowing medium such as exhaust gas, charge air, coolant, oil, etc. amounts.

The under the given operating conditions of an exhaust gas recirculation (EGR) system Particle and condensate deposits on the actuator of an EGR valve can affect the function of the valve. In the worst case can it becomes an irreversible one Closure of the actuator come. For this reason, a cleaning mechanism needs be provided of the actuator.

By which fall in the operating conditions given in an EGR system Particle and condensate deposits on. These deposits can too a gluing a flap / a plate of a conventional Guide the valve to the seat or to a blockage of leadership a valve rod, which may be a further movement the flap / the plate is prevented relative to the valve seat and thus the EGR valve no longer usable is.

One EGR valve, in particular a spool EGR valve, holds in its Zero position closed the EGR line. By a movement of the actuator in one direction, the EGR line is opened, the exhaust gas via a Exhaust gas heat exchanger stream can. By moving the actuator out of zero position in the other direction also the EGR line is opened, wherein now the exhaust over a bypass on the exhaust gas heat exchanger flow past can. By the size of the hub the recirculated exhaust gas quantity is adjusted.

• a) aus der Nulllage (AGR-Leitung verschlossen) bewegt sich das Stellglied längs zu seiner Achse in die eine bzw. in die andere Richtung, wobei die AGR-Leitung während der ganzen Zeit verschlossen bleibt;
• b) aus einer Ausgangslage bewegt sich das Stellglied längs zu seiner Achse in die eine bzw. in die andere Richtung. Hierbei öffnet es die AGR-Leitung, einmal zum Wärmeübertrager hin, zum anderen zum Bypass hin;
• c) das Stellglied wird über einen Mechanismus zum Drehen um seine Achse gebracht, wobei die Drehung alternierend in die eine bzw. andere Richtung erfolgen kann bzw. immer in eine Richtung erfolgen kann;
• d) es können Kombinationen obiger Längs- und Drehbewegungen erfolgen.

For cleaning, the type of movement of the actuator can be as described below:

• a) from the zero position (EGR line closed), the actuator moves along its axis in one or the other direction, the EGR line remains closed during the whole time;
• b) from an initial position, the actuator moves longitudinally to its axis in the one or in the other direction. In doing so, it opens the EGR line, once to the heat exchanger and to the bypass.
• c) the actuator is brought about a mechanism for rotating about its axis, wherein the rotation can take place alternately in the one or the other direction or can always take place in one direction;
• d) combinations of the above longitudinal and rotational movements can take place.

• a) bei Längsbewegung führt das Stellglied den maximal möglichen Hub bzw. einen Prozentsatz des Maximalhubs in die eine Richtung aus und kehrt in seine Ausgangslage zurück;
• b) bei Längsbewegung führt das Stellglied den maximal möglichen Hub bzw. einen Prozentsatz des Maximalhubs in die andere Richtung aus und kehrt in seine Ausgangslage zurück;
• c) bei Längsbewegung führt das Stellglied den maximal möglichen Hub bzw. einen Prozentsatz des Maximalhubs in beide Richtungen aus und kehrt in seine Ausgangslage zurück;
• d) die unter a) bis c) beschriebenen Mechanismen werden mehrmals wiederholt.

When cleaning the movement of the actuator can be done as follows:

• a) during longitudinal movement, the actuator performs the maximum possible stroke or a percentage of the maximum stroke in one direction and returns to its original position;
• b) during longitudinal movement, the actuator performs the maximum possible stroke or a percentage of the maximum stroke in the other direction and returns to its original position;
• c) during longitudinal movement, the actuator performs the maximum possible stroke or a percentage of the maximum stroke in both directions and returns to its original position;
• d) the mechanisms described under a) to c) are repeated several times.

The Adjustment speed can be used with all described mechanisms slower, faster, or the same speed as the adjustment speed under normal conditions. It is crucial that the drive of the EGR valve for a short time a higher one Displacement force can apply as under normal conditions to by to overcome the pollution caused, possibly higher frictional or resistive forces.

• a) bei einem mit Diesel-Verbrennungsverfahren betriebenen Fahrzeug vor Inbetriebnahme des Motors oder in der Vorglühphase;
• b) bei einem nach dem Otto-Verbrennungsverfahren betriebenen Fahrzeug ebenfalls vor Inbetriebnahme des Motors, z. B. bei Inbetriebnahme der Kraftstoffpumpe und/oder anderer Nebenaggregate;
• c) bei/nach Abstellen des Motors;
• d) während des Betriebs des Motors, wobei dieser sich in einem Betriebspunkt befindet bei dem keine AGR stattfindet. Dies ist insbesondere bei besonders ausgeführten Stellgliedern von AGR-Ventilen, die eine Bewegung des Stellglieds ohne Öffnung des Ventilsitzes erlauben, wie z. B. einem Kolbenschieber, möglich. Hierfür ist insbesondere der unter Bewegungsart, a) beschriebene Reinigungsmechanismus geeignet, bei dem sich das Stellglied so bewegt, das das Ventil trotzdem verschlossen bleibt;.
• e) während des Betriebs des Motors, wobei dieser sich in einem Betriebspunkt befindet bei dem AGR stattfindet. Dies ist insbesondere bei besonders ausgeführten Stellgliedern von AGR-Ventilen, die eine Drehbewegung des Stellglieds erlauben, wie z. B. einem Kolbenschieber, möglich.

The cleaning can be carried out in the following operating states of the internal combustion engine:

• (a) in a diesel-fuel-injected vehicle, before starting the engine or during the pre-ignition phase;
• b) in a vehicle operated by the Otto combustion process vehicle also before putting the engine, z. B. at startup of the fuel pump and / or other accessories;
• c) when / after stopping the engine;
• d) during operation of the engine, which is at an operating point at which no EGR takes place. This is especially true for specially designed actuators of EGR valves that allow movement of the actuator without opening the valve seat, such. As a piston valve, possible. For this purpose, in particular, the cleaning mechanism described under movement type, a) is suitable, in which the actuator moves so that the valve still remains closed.
• e) during operation of the engine, which is at an operating point at which EGR takes place. This is especially true for specially designed actuators of EGR valves that allow a rotational movement of the actuator, such as. As a piston valve, possible.

• a) eine Reinigung regelmäßig in vorher festgelegten Intervallen stattfindet, wobei die Intervalle zeitlicher Natur sein können oder von der Betriebszeit des Motors abhängen oder vom Kilometerstand des Fahrzeugs abhängen;
• b) eine Reinigung bei jedem Anfahren und Abstellen des Motors stattfindet;
• c) eine Reinigung durchgeführt wird, wenn die Abweichung eines Sensorsignals der Lagerückmeldung des Antriebs des AGR-Ventils (IST-Position) bei gegebenem elektrischem Ansteuersignal (SOLL-Position) größer als 3% ist;
• d) eine mögliche Verschmutzung durch eine Abweichung eines Sensorsignals der Lagerückmeldung des Antriebs des AGR-Ventils bei gegebenem elektrischem Ansteuersignal vom hinterlegten (unverschmutzten) Sensorsignal bei selbigem Ansteuersignal erkannt wird und eine Reinigung initiiert wird;
• e) die Reinigungsinitiierung eine Kombination obiger Mechanismen ist.

The initiation of the cleaning mechanism can take place in such a way that:

• a) a cleaning periodically takes place at predetermined intervals, the intervals time be dependent on the operating time of the engine or depend on the mileage of the vehicle;
• b) cleaning takes place every time the engine is started and stopped;
• c) a cleaning is carried out if the deviation of a sensor signal of the position feedback of the drive of the EGR valve (ACTUAL position) for a given electrical drive signal (DESIRED position) is greater than 3%;
• d) a possible contamination is detected by a deviation of a sensor signal of the bearing feedback of the drive of the EGR valve for a given electrical control signal from the stored (unpolluted) sensor signal at selbigem control signal and a cleaning is initiated;
• e) the cleaning initiation is a combination of the above mechanisms.

Claims (51)

Heat exchanger valve device for regulating a fluid flow, in particular an exhaust gas or charge air flow, with a valve housing ( 2 ; 52 ; 212 ), which has an entrance ( 4 ; 54 ; 214 ) for the fluid flow and a heat exchanger outlet ( 11 ; 61 ; 221 ), by which a heat exchanger, in particular a cooler, in dependence on the position of a valve body, a more or less large fluid flow is supplied, characterized in that the valve housing ( 2 ; 52 ; 212 ) a further output, in particular a bypass output ( 12 ; 62 ; 222 ), by which, depending on the position of an actuator ( 16 ; 66 ; 226 ), which has a longitudinal axis and parallel to its longitudinal axis movable back and forth in the valve housing ( 2 ; 52 ; 212 ) is arranged, a more or less large fluid flow is past the heat exchanger. Heat exchanger valve device according to claim 1, characterized in that the actuator ( 16 ; 66 ; 226 ) between a first extreme position, in which the further output ( 12 ; 62 ; 222 ) and the heat exchanger outlet ( 11 ; 61 ; 221 ) is open, and a second extreme position is movable back and forth, in which the further output ( 12 ; 62 ; 222 ) and the heat exchanger output ( 11 ; 61 ; 221 ) closed is. Heat exchanger valve device according to one of the preceding claims, characterized in that in a further valve position of the actuator, the further output ( 12 ; 62 ; 222 ) and the heat exchanger outlet ( 11 ; 61 ; 221 ) are closed. Heat exchanger valve device according to one of the preceding claims, characterized in that in a further valve position of the actuator, the further output ( 12 ; 62 ; 222 ) and the heat exchanger outlet ( 11 ; 61 ; 221 ) are at least partially open. Heat exchanger valve device according to one of the preceding claims, characterized in that in a further valve position of the valve slide the further output ( 12 ; 62 ; 222 ) and the heat exchanger outlet ( 11 ; 61 ; 221 ) are open. Heat exchanger valve device according to one of the preceding claims, characterized in that in a further valve position of the actuator, the further output ( 12 ; 62 ; 222 ) in particular partially open and the heat exchanger output ( 11 ; 61 ; 221 ) closed is. Heat exchanger valve device according to one of the preceding claims, characterized in that in a further valve position of the actuator of the heat exchanger output ( 11 ; 61 ; 221 ) in particular partially opened and the further output ( 12 ; 62 ; 222 ) closed is. Heat exchanger valve device according to one of the preceding claims, characterized in that the actuator ( 66 ; 226 ) a substantially circular cylindrical closing body ( 70 ; 80 ; 90 ; 230 ). Heat exchanger valve device according to claim 8, characterized in that the closing body ( 70 ; 80 ; 90 ; 230 ) a central through hole ( 75 ; 85 ; 95 ) having. Heat exchanger valve device according to claim 8 or 9, characterized in that the closing body ( 80 ; 90 ; 230 ) on at least one end face a plurality of projections ( 88 . 89 ; 201 - 203 ; 231 . 232 ) having. Heat exchanger valve device according to one of claims 8 to 10, characterized in that the closing body ( 90 ; 230 ) on both end faces several projections ( 201 - 205 ; 231 - 234 ) having. Heat exchanger valve device according to one of claims 8 to 11, characterized in that the actuator ( 226 ) by means of at least one spring element ( 236 . 239 . 303 ), in particular by a symmetrically preloaded spring or between two spring elements ( 236 . 239 ) is biased to a zero position or held in a zero position in which the input ( 214 ) is closed. Heat exchanger valve device according to one of claims 8 to 12, characterized gekennzeich net, that the closing body ( 230 ) by two bearing rings ( 261 . 262 ) is guided. Heat exchanger valve device according to one of the preceding claims, characterized in that the actuator ( 16 ; 66 ) is at least partially made of ceramic and / or steel. Heat exchanger valve device according to one of the preceding claims, characterized in that the valve housing ( 2 ; 52 ) is at least partially made of ceramic and / or steel. Heat exchanger valve device according to one of the preceding claims, characterized in that the actuator ( 16 ) with at least one sealing element ( 24 ) for the entrance ( 4 ) Is provided. Heat exchanger valve device according to claim 16, characterized in that the at least one sealing element ( 24 ) one the entrance ( 4 ) facing sealing surface ( 26 ), which has the shape of a ball portion, a ball, a cylinder, a cone or a truncated cone. Heat exchanger valve device according to claim 16 or 17, characterized in that the at least one sealing element ( 24 ) on the actuator ( 16 ) is guided back and forth movable. Heat exchanger valve device according to one of claims 16 to 18, characterized in that the at least one sealing element ( 24 ) by a spring device ( 30 ) against the entrance ( 4 ) is biased. Heat exchanger valve device according to one of the preceding claims, characterized in that the actuator ( 16 ) at least one pressure equalization channel ( 22 ) having. Method for cleaning a heat exchanger valve device according to one of the preceding claims, characterized in that the actuator ( 16 ; 66 ) is moved from a zero position along its longitudinal axis in one and / or in the other direction. Method according to claim 21, characterized that an exhaust gas recirculation line the heat exchanger valve device especially during the cleaning process is closed in the zero position. Method according to claim 22, characterized in that that the exhaust gas recirculation line, in particular two exhaust gas recirculation lines, the heat exchanger valve device while the cleaning process remains closed or remain. Method for cleaning a heat exchanger valve device according to one of Claims 1 to 20, characterized in that the actuator ( 16 ; 66 ) is moved from a starting position along its longitudinal axis in one and / or in the other direction. Method according to Claim 24, characterized that an exhaust gas recirculation line the heat exchanger valve device during the Cleaning process to a heat exchanger and / or opened to a bypass becomes. Method for cleaning a heat exchanger valve device according to one of Claims 1 to 20, in particular according to one of Claims 21 to 25, characterized in that the actuator ( 16 ; 66 ) is rotated about its longitudinal axis. Method according to claim 26, characterized in that that the rotation takes place alternately in one or the other direction. Method according to claim 26, characterized in that that the rotation takes place in one direction only. Method according to one of claims 21 to 26, characterized that the longitudinal movement of the actuator combined with the rotary motion of the actuator becomes. Method according to one of Claims 21 to 29, characterized that the actuator during the longitudinal movement, repeated several times, a maximum possible Hub or a percentage of the maximum possible stroke in one direction carries and returns to its original position. Method according to claim 30, characterized in that that the actuator during the longitudinal movement, repeated several times, a maximum possible Hub or a percentage of the maximum possible hub in the other Direction and returns to its original position. Method according to one of Claims 21 to 29, characterized that the actuator during the longitudinal movement, repeated several times, a maximum possible Hub or a percentage of the maximum possible stroke in both directions carries and returns to its original position. Method according to one of claims 21 to 32, characterized in that the Verstellge cleaning speed is slower, faster or as fast as the adjustment speed under normal conditions. Method according to one of claims 21 to 33, characterized that by a drive of the heat exchanger valve device a higher one for a short time Adjusting force is applied as under normal conditions. Method according to one of Claims 21 to 34, characterized that the cleaning in the following operating conditions of an internal combustion engine he follows: a) in a diesel combustion process prior to commissioning the internal combustion engine or in the Vorglühphase; b) in a gasoline combustion process before commissioning of the internal combustion engine, for example, during commissioning a fuel pump and / or other accessories; c) at / after Stopping the internal combustion engine; d) during operation of the internal combustion engine, wherein the internal combustion engine is at an operating point at no exhaust gas recirculation takes place; e) while the operation of the internal combustion engine, wherein the internal combustion engine is located at an operating point where exhaust gas recirculation takes place. Method according to one of claims 21 to 35, characterized that the initiation of the cleaning mechanism takes place in this way, that: a) cleaning regularly at predetermined intervals takes place; b) a cleaning every time you start and stop the Internal combustion engine takes place; c) a cleaning is carried out, if the deviation of a sensor signal of a bearing feedback of the Drive of the heat transfer valve device (ACTUAL position) for a given electrical drive signal (DESIRED position) greater than 3 percent is; d) one possible Contamination due to a deviation of a sensor signal from the position feedback of the Drive the heat exchanger valve device at a given electrical drive signal from a stored (unpolluted) sensor signal detected at selbigem control signal and a cleaning is initiated; Method according to one of claims 21 to 36, characterized in that during the method for cleaning the heat exchanger output ( 11 ; 61 ; 221 ) and / or the bypass output ( 12 ; 62 ; 222 ) are closed. Method according to one of claims 21 to 37, characterized in that the method for cleaning is started as soon as a detected sensor signal of a sensor device, in particular for measuring a frictional resistance force of a frictional resistance between at least one closing body ( 230 . 302 ) and at least one housing guide section ( 350 ), coincides with a reference signal. Heat exchanger, in particular exhaust gas heat exchanger, with a heat exchanger valve device ( 1 ) according to one of claims 1 to 20. Exhaust gas recirculation system with or on an internal combustion engine, in particular a motor, the or at an extraction point ( 108 ) and via a return point ( 109 ) recirculated exhaust gas is supplied, characterized in that between the sampling point ( 108 ) and the return center ( 109 ) a heat transfer valve device ( 111 . 121 . 131 . 141 . 151 . 161 ) is connected according to one of claims 1 to 20. Exhaust gas recirculation system according to claim 40, characterized in that the heat exchanger valve device ( 111 . 121 . 131 . 141 . 151 . 161 ) with an exhaust gas cooling device ( 112 . 122 . 132 . 133 . 142 . 152 . 162 . 163 ) connected is. Exhaust gas recirculation system according to one of claims 40 to 41, characterized in that the heat exchanger valve device ( 111 . 121 . 131 . 141 . 151 . 161 ) in the exhaust gas cooling device ( 112 . 122 . 132 . 133 . 142 . 152 . 162 . 163 ) is integrated. Exhaust gas recirculation system according to one of claims 40 to 42, characterized in that the heat exchanger valve device ( 111 . 121 . 131 . 141 . 151 . 161 ) cohesively with the exhaust gas cooling device ( 112 . 122 . 132 . 133 . 142 . 152 . 162 . 163 ) connected is. Exhaust gas recirculation system according to one of claims 40 to 43, characterized in that the exhaust gas cooling device ( 112 . 132 . 133 . 142 ; 162 . 163 ) has a bypass. Exhaust gas recirculation system according to one of claims 40 to 44, characterized in that the exhaust gas cooling device ( 122 ; 152 ) comprises a U-flow cooler. Exhaust gas recirculation system according to one of claims 40 to 45, characterized in that the heat exchanger valve device ( 111 . 121 . 131 . 141 . 151 . 161 ), in the flow direction from the sampling point ( 108 ) to the return center ( 109 ), upstream of the exhaust gas cooling device ( 112 . 122 . 132 . 133 . 142 . 152 . 162 . 163 ) is arranged. Exhaust gas recirculation system according to one of claims 40 to 46, characterized in that the heat exchanger valve device ( 111 . 121 . 131 . 141 . 151 . 161 ), in the flow direction from the sampling point ( 108 ) to the return center ( 109 ), downstream of the exhaust gas cooling device ( 112 . 122 . 132 . 133 . 142 . 152 . 162 . 163 ) is arranged. Exhaust gas recirculation system according to one of claims 40 to 47, characterized in that the heat exchanger valve device ( 131 . 161 ) a high-temperature exhaust gas cooler ( 132 . 162 ) and a low-temperature exhaust gas cooler ( 133 . 163 ). Exhaust gas recirculation system according to one of claims 40 to 48, characterized in that the heat exchanger valve device ( 131 . 161 ), in the flow direction from the sampling point ( 108 ) to the return center ( 109 ), upstream or downstream of the high temperature exhaust gas cooler ( 132 . 162 ) or the low-pressure exhaust gas cooler ( 133 . 163 ) is arranged. Exhaust gas recirculation system according to one of the claims 40 to 49, characterized in that the exhaust gas recirculation system from a high pressure exhaust gas recirculation system is formed. Exhaust gas recirculation system according to one of the claims 40 to 49, characterized in that the exhaust gas recirculation system from a low pressure exhaust gas recirculation system is formed.