DE10211466C1 - Automatic stop-start method for automobile IC engine with selective over-ride of stop start functions dependent on safety operating requirements for automobile - Google Patents

Abstract

The automatic stop-start method uses a stop-start device (16) with a stop function for cut-out of the IC engine (2) initiated via an AND logic, detecting simultaneous application of the automobile brakes and stopping or a minimum travel velocity of the automobile and a start function for re-starting the engine initiated via a second AND logic when simultaneous re-starting conditions exist. The automatic stop and start functions are dependent on the detected operating position of the engine hood (26), the driver door (40), the operation of the automobile air-conditioning system (22) and/or the operating condition of the oil system (56) for the drive transmission (6).

Description

The invention relates to a method for automatic Shutting down and starting an internal combustion engine according to the Preamble of claim 1.

Furthermore, the invention relates to a motor vehicle according to the The preamble of claim 16.

A method and a motor vehicle of this kind are known from DE 44 12 438 C1 known. In a first process step is the running internal combustion engine via an electronic Control device by interrupting the fuel supply automatically turned off when over the duration of a given Dwell time certain engine stop conditions are met. In a second method step is the previously parked Internal combustion engine by means of the control device again automatically started when certain engine start conditions are fulfilled. One of the engine stop conditions is that the Driving speed of the motor vehicle below a predetermined value, preferably 0 or at least smaller than a predetermined limit speed of z. B. 0.5 km / h is, and the engine speed is closed Traction drive clutch is below a predetermined value. The engine start conditions include at least that no Gear engaged and that tapped the clutch pedal is or that according to another embodiment no Gear is engaged and the engine temperature over a predetermined value has risen.  

A method and a motor vehicle of this kind is also known from DE 195 32 135 A1. It contains a stop-start automatic for switching off and starting the internal combustion engine Motor vehicle depending on stop conditions or of Starting conditions. As starting conditions are mentioned zero load, Pushing operation, idling of the drive unit (ie speed below a certain low value), stoppage of the Motor vehicle (i.e., driving speed below a certain small value of z. B. 4 km / h), drive unit disengaged, no gear engaged, the vehicle brake is operated, operation of a stop switch, operating temperature reaches the drive unit and / or the state of charge Battery sufficiently charged for further starting conditions. The Stopping the drive unit or the internal combustion engine can either immediately upon the occurrence of the stop condition (i.e. short reaction time) or delayed (eg with a Reaction time of a few seconds). In the Stop conditions may also include variables which Concern history, z. B. it may be necessary that the vehicle since the last stop of the internal combustion engine drove at least once. Also it is possible from the previous driving characteristics to recognize whether the Vehicle in city traffic, in a stop-and-go traffic one Congestion or overland traffic is located. The Response time can be adaptively variable depending on Single or operating conditions or the driving history. For example, in the case where in the near past Motor vehicle had to stop at many traffic lights, the Reaction time will be shortened automatically or in the opposite Case be extended. The stop conditions can be alone or in subcombination and also in total combination (AND Function) are present. As starting conditions, alone or in Subcombination or total combination (AND function) may be present are mentioned: operation of the accelerator pedal, Releasing the vehicle brake, actuating the clutch, Touch or move a gear lever, insert a Ganges, pressing a start switch. Furthermore, more  Starting conditions are required, for. B. that the engine is stationary and / or previously switched off by automatic stop has been. An "emergency start" can be triggered if z. B. the temperature of the internal combustion engine under the Operating temperature decreases or the state of charge of the battery falls below a threshold, but z. B. for power supply of air conditioners, servo drives, pumps or others Auxiliary machines is needed.

By the invention, the problem to be solved, the Increase operational safety and ride comfort.

This object is achieved according to the invention by the Characteristic features of claim 1 or claim 16 solved.

Further features of the invention are in the subclaims contain.

Accordingly, the invention relates to a method for automatically switching off and starting an internal combustion engine ( 2 ) of a motor vehicle by means of a stop-start device ( 16 ) through which the internal combustion engine ( 2 ), after starting the internal combustion engine ( 2 ) by a person and a Driving the motor vehicle with an internal combustion engine ( 2 ), when stopping the motor vehicle and the simultaneous AND function simultaneous presence of certain stop conditions, which include at least the operation of a motor vehicle brake ( 38 ) and a vehicle standstill or a vehicle standstill approximate low vehicle speed, automatically switched off is then automatically restarted as AND function simultaneous presence of certain starting conditions, the automatic shutdown of the internal combustion engine ( 2 ) by a stop function and then taking place automatically starting the engine ( 2 ) by a start function of the stop-start device ( 16 ), characterized in that the function of the automatic shutdown and / or the automatic starting of the internal combustion engine takes place in dependence on the respective operating state of an engine hood.

Another feature of the invention is characterized that to the starting conditions for an automatic start of the Combustion engine, which exist as an AND function simultaneously must heard that the hood is in the closed position.

Another feature of the invention is characterized that to the starting conditions for an automatic start of the Combustion engine, which exist as an AND function simultaneously heard that the hood is locked.

Another feature of the invention is characterized in the case of engine hoods which have two locking stages, of which a first locking step the hood in their fully closed closed position locked and the second locking step the bonnet in a light open, the fully closed position so far approximate partial open position locked that the hand an adult person not through the opening gap in the Engine room can be long, to the starting conditions for a automatic starting of the internal combustion engine, which Function must be present at the same time, heard that the Bonnet in the fully closed position or at least is in the partial exposure and at the same time by at least one of the two locking stages is locked.

Another feature of the invention is characterized that to the starting conditions for an automatic start of the Combustion engine, which exist as an AND function simultaneously Must heard that the hood unlocked and at the same time in the closed position, and that does not exist this Starting conditions of the internal combustion engine by the automatic  Start function is not automatically started.

Another feature of the invention is characterized that to the starting conditions for an automatic start of the Combustion engine, which exist as an AND function simultaneously Must heard that the hood unlocked and at the same time is in the closed position or at least in one of Closed positions as far as approximate partial opening, that the hand of an adult person is not affected by the Opening gap in the engine compartment can be long.

Another feature of the invention is characterized that the internal combustion engine by the automatic stop function the device is automatically turned off when the Engine hood is opened in the locked state.

Another feature of the invention is characterized that to the stop conditions for an automatic shutdown of Internal combustion engine heard that the bonnet is closed, with the automatic shutdown is omitted and thus the Internal combustion engine continues to run when the bonnet does not closed is.

Another feature of the invention is characterized that to the stop conditions for an automatic shutdown of Internal combustion engine heard that the hood closed and is locked, with the automatic shutdown is omitted and thus the internal combustion engine continues to run when the Bonnet not closed or not locked.

Another feature of the invention is characterized in the case of engine hoods which have two locking stages, of which a first locking step the hood in their fully closed closed position locked and the second locking step in the bonnet in a light open, the fully closed position so far approximate partial open position locked that the hand  an adult person not through the opening gap in the Engine compartment, which is blocked by the automatic stop Function automatically shut down internal combustion engine of the Setup is automatically started when the first one Locking the bonnet in its complete Closed position unlocked.

Another feature of the invention is characterized that the stop-start function of the stop-start device by a person on an intended on-off switching means on and can be switched off.

Another feature of the invention is characterized that the stop-start device contains a priority circuit, by which the starting function takes precedence over the stop function gets if a person turned off automatically Internal combustion engine on a trained for an instant start Control generates an instant start signal, through which the automatically switched off internal combustion engine is started, although not all start conditions for an automatic Starting the internal combustion engine through the stop-start Device available.

Another feature of the invention is characterized that at least the driver's door, or several or all Motor vehicle doors monitored by the stop-start device whether they are closed or open, and that automatic shutdown and / or automatic start of the internal combustion engine depending on whether the relevant motor vehicle door or respective Motor vehicle doors are closed or at least one Car door is open.

Another feature of the invention is characterized that the automatic shutdown of the internal combustion engine additionally depending on the further stop condition takes place that a stop release state of a  Climate control device of an air conditioning device is present, which for air conditioning of the motor vehicle passenger compartment drivingly connected to the internal combustion engine or connectable unit in the form of a refrigerant compressor and / or a blower, wherein the automatic Shutdown only takes place when the stop release State as one of the stop conditions as an AND function present at the same time as other stop conditions.

Another feature of the invention is characterized in that the automatic shutdown of the internal combustion engine ( 2 ) by the stop function of the stop-start device ( 16 ) in dependence on the operating state of an oil system ( 56 ) of a traction drive ( 6 ) as a further stop condition , which must be fulfilled as AND function simultaneously with all other stop conditions, wherein the automatic shutdown of the internal combustion engine ( 2 ) is omitted, although all other stop conditions, but not this further stop condition is met, and wherein the oil system ( 56 ) at least one oil pump ( 24 ) contains.

Furthermore, the invention relates to a motor vehicle comprising an internal combustion engine and a stop-start device for automatically switching off and starting the internal combustion engine, by which the internal combustion engine, after switching on its ignition system and then starting the internal combustion engine and a first time driving the motor vehicle with the tempered internal combustion engine, when stopping the motor vehicle and the simultaneous presence of certain stop conditions, which include at least the actuation of a motor vehicle brake and a vehicle standstill or a low vehicle speed approximate vehicle standstill is automatically switched off and then in the presence of certain starting conditions, to which at least one of a person to be fulfilled start signal and that the ignition system has not been switched off since the engine was switched off, is automatically restarted, whereby by the Stop function of the stop-start device, the internal combustion engine automatically switched off and then automatically restarted by the start function of the stop-start device of the internal combustion engine, characterized in that the stop-start device part of an electronic control device ( 14 ) is and is formed together with this for performing the method steps according to at least one of the preceding claims.

The invention will be described below with reference to the drawings based on preferred embodiments as examples described. In the drawings show

Fig. 1 details a motor vehicle according to the invention,

Fig. 2 is a side view of a motor vehicle according to the invention,

Fig. 3 is a diagram of a method according to the invention,

Fig. 4 is a diagram of another method according to the invention,

Fig. 5 is a diagram of another method according to the invention.

Fig. 1 shows an internal combustion engine 2 via a clutch 4 and a switchable manually or automatically shiftable or automatic traction drive transmission 6 and a differential gear 8 vehicle wheels 10 and 12 drives. An electronic control device 14 for the internal combustion engine 2 is connected to it, and preferably also to the transmission 6, depending on the control, in particular if it is a shiftable transmission 6 or an automatic transmission. Furthermore, it is preferably also connected to the switchable clutch 4 in terms of control. The electronic control device 14 also includes a stop-start device 16 of the type described here for automatically switching off and starting the internal combustion engine 2 in dependence on the stop conditions and starting conditions described here.

FIG. 1 also shows an electric machine 18 , which can be activated by the electronic control device 14 in order to start the combustion engine 2 as an electric motor. Preferably, the electric machine 18 is also operable as a generator for generating power for an on-board battery 20 . This is used to supply power to the electric machine 18 at the start of the engine 2 and to power auxiliary equipment such as an air conditioner 22 for the vehicle interior and at least one pump 24 for generating hydraulic pressures for actuating the traction drive clutch 4 and / or for the operation of clutches in the transmission. 6 and / or for the circulation of cooling fluid or lubricating fluid of the transmission 6 .

According to a further feature of the invention, the automatic shutdown and / or the automatic starting of the internal combustion engine 2 takes place as a function of the respective operating state of an engine hood 26 . Among the starting conditions for an automatic start of the internal combustion engine 2 is that at the same time the hood must be in the closed position as an AND function, or, according to another embodiment, must be in a locking position.

According to a particular embodiment, the bonnet 26 may have two locking steps 28 and 30 , of which the first locking step 28 locks the bonnet 26 in its fully closed closed position and is operable from the passenger compartment 32 , and the second locking step 30 opens the bonnet 26 in a slightly open one , the fully closed closed position locked as close to partially open position that the hand of an adult person can not get through the opening gap in the engine compartment. Among the starting conditions for automatic starting of the internal combustion engine 2 , which must be present as an AND function simultaneously, heard that the hood 26 is in the full closed position or at least in the partial open position and simultaneously locked by at least one of the two locking stages 28 , 30 is.

Furthermore, the invention shows an accelerator pedal 34 for the internal combustion engine 2 and a brake pedal 36 for the vehicle brake 38 .

According to a further embodiment of the invention, all motor vehicle doors 40 , in particular the driver's door, are monitored by the stop-start device 16 , whether they are closed or open. The automatic shutdown and / or the automatic starting of the internal combustion engine 2 takes place in dependence on whether all motor vehicle doors are closed or at least one motor vehicle door is open. The starting conditions, which must be met simultaneously as an AND function, preferably includes that all motor vehicle doors 40 are closed, so that an automatic starting of the internal combustion engine is omitted if at least one motor vehicle door is open.

A trunk door or decklid 42 is preferably equally included in the stop conditions and / or launch conditions as the vehicle doors 40 . According to a further embodiment of the invention, the automatic shutdown of the internal combustion engine 2 is dependent on the further stop condition that a stop release of an air conditioning device 22 is present, which for the air conditioning of the motor vehicle passenger compartment 32 an example connected to the internal combustion engine or connectable unit in the form of a refrigerant compressor 44 and / or a blower 46 . If the air-conditioning device 22 has only one fan 46 , this only serves to convey fresh air from the outside atmosphere into the passenger space 32 . However, it is used depending on the climate setting for the promotion of fresh air, cooling air or hot air when the air conditioning 22 is an air conditioner and the refrigerant compressor 44 is provided.

A temperature sensor 48 of the stop-start device 16 detects in the passenger compartment 32, the temperature for maintaining a comfortable for the driver and possibly also for passengers temperature. A humidity sensor 50 of the stop-start device 16 detects in the passenger compartment 32, the humidity for maintaining a humidity in which the vehicle windows 52 , in particular the windshield, can not mist. Windshield fogging would be a dangerous driving condition when the engine starts automatically.

According to a further embodiment, the automatic shutdown of the internal combustion engine 2 by the stop-start device 16 also takes place as a function of the operating state of an oil system 56 for the transmission 6 (switching element actuation and / or cooling oil) and / or for a steering system 58 of the motor vehicle as Another stop condition, which must be fulfilled as an AND function simultaneously with all other stop conditions. The automatic shutdown of the internal combustion engine 2 is omitted, although all other stop conditions, but not this additional stop condition is met. The oil system includes at least one oil pump 24 .

Fig. 3 shows on the horizontal axis the time and on the vertical axis different starting conditions for an automatic starting of the internal combustion engine after an automatic shutdown of the internal combustion engine by the stop-start device. At time t0, the internal combustion engine is in the automatically switched-off state or is switched off automatically. At time t1, at least one motor vehicle door is open, which is represented by a diagram line "S1". Simultaneously with the opening of the door, a start prohibit function is performed at time t1, which is shown by a diagram line "S2" and results in blocking the start function of the stop-start device at t1. At time t2, all doors are closed again, which also eliminates the start ban. Thereafter, at time t3, a start request is made by a driver of the motor vehicle, which is represented by a diagram line "S3". The start request can be communicated to the stop-start device 16 by the driver, for example, by releasing the vehicle brake and / or accelerating and / or by touching or actuating a gear selector element or another starting element, depending on the respective embodiment of the motor vehicle and the controller 14 . If all other starting conditions provided are met, the automatic starting of the internal combustion engine by the stop-start device 16 takes place at time t3 either simultaneously or with a delay, depending on the embodiment.

The embodiment of Fig. 3 has the advantage that the engine does not start automatically when the driver notifies his start request as a start condition of the stop-start device, although a vehicle door is open, e.g. When a child gets out.

Fig. 4 shows again t a horizontal time axis and a vertical axis situation or signal axis S.

At the time t1, a vehicle door is opened, which is shown by a diagram line "S1". Thus, a start prohibition is generated, which is represented by a diagram line "S2" and z. B. can be realized by a start prohibition signal, which causes a blocking of the start function or switching off the stop-start device. Thereafter, at the time t3, a start request of the driver, which is represented by a diagram line "S3", at a time at which the start prohibition "S2" still exists, since at least one motor vehicle door is open according to the diagram line "S1". The stop-start device is designed such that in this case (unlike in Fig. 3) closing all doors does not cancel the start prohibition "S2". Thus, since this start condition is not satisfied, the engine is not automatically started by the stop-start device, although the start request "S3" is still present. The stop-start device is designed in such a way that in this case it can no longer automatically start the internal combustion engine, even if all starting conditions are met. The internal combustion engine can now only be restarted and started so that the driver performs a complete restart of the internal combustion engine by restarting the internal combustion engine with the ignition key or another ignition element at time t4 according to the diagram line S4.

Example of FIG. 4: The driver stops the motor vehicle, which actuates the brake. The child gets out and leaves the door open. The driver leans to one side or turns back to close the vehicle door. He accidentally goes off the brake. Now, in the case of Fig. 3, the engine would be automatically started and started by the stop-start device as soon as the vehicle door is closed. Thus, the motor vehicle would start unintentionally in an automatic transmission, which could lead to an accident, for example at an intersection. The same situation according to FIG. 4 also occurs when the child closes the vehicle door himself, but the driver has previously accidentally released the vehicle brake. The term "brake" is used here generally for the normal vehicle brake as well as for a manually or by foot control detectable brake.

Fig. 5 shows a diagram for a method or a motor vehicle according to the invention, in which it was at the time t0 of the internal combustion engine by the stop-start device automatically switched off sixteenth At time t1, the driver's door is opened corresponding to the line S1, thereby automatically setting a start prohibit signal according to line S2 at the same time. Thus, the automatic stop-start function is overridden beyond the time t2 at which the driver's door is closed again, so that the engine is not automatically started at the further time t3, although at this time corresponding to the line S3, a driver's request is present for starting and thus with the exception of the start condition for the driver's door all other starting conditions are met. The internal combustion engine can not be restarted automatically in this situation, but only by a person according to the line S4 manually using the ignition key or radio without the function of the stop-start device. This avoids that, after the driver has dropped out of the vehicle, children unintentionally, for example, by releasing the brake or pressing the accelerator pedal 34 , start the engine. This shows that embodiments of the invention are possible in which not all vehicle doors, but only the driver's door is monitored and their condition is considered as a start condition and / or as a stop condition.

In order to reduce unnecessary fuel consumption at intermediate stops, when the motor vehicle is, an automatic stop-start operation of the internal combustion engine 2 is controlled by the electronic control device 14 and the stop-start device 16 . The function is performed on the basis of a priority list. The highest priority is safety, followed by comfort and maximum fuel economy.

In the decision for an "automatic shutdown" of the internal combustion engine at least one, preferably more of the stop conditions mentioned in the patent application, optimally all stop conditions must be fulfilled, in each case in AND operation, for example:

• 1. Hood closed.  
• 2. Motor vehicle is standing, the vehicle speed equal to zero or zero, for example smaller or equal to 0.5 km / h.
• 3. Accelerator not actuated.
• 4. brake element, z. B. brake pedal or manual lockable brake or foot parking brake actuated.
• 5. All vehicle doors and preferably also a trunk door or a trunk lid, or at least the driver's door, are closed.
• 6. In the case of an automatic transmission, the selector lever is on a driving position, z. B. D, or in a neutral position, z. B. N.
• 7. The temperature of the exhaust system (eg catalyst temperature) has reached its operating value.
• 8. The internal combustion engine (oil temperature and Cooling water temperature) has reached its operating temperature.
• 9. The transmission or transmission oil has operating temperature reached and the pressure supply and thus the switchability of the gearbox as well as the avoidance of overheating in the Transmission is ensured even when the engine is switched off.
• 10. From the climate control of an air conditioning, z. B. Cooling fan and / or air conditioning of the motor vehicle is located a release, by which it is ensured that for example, the humidity in the motor vehicle in Order is that the vehicle windows can not fog up, and the temperature inside the vehicle within a acceptable tolerance range.
• 11. There is a release by a battery Control device, by which, for example it is ensured that the state of charge of Vehicle battery is sufficiently good to have an automatic or manual restart of the internal combustion engine ensure and is also good enough to possibly existing other power consumers of Motor vehicle during the stophase sufficient with electricity to supply.  
• 12. Any appropriate, and, where appropriate variable, delay time before activating the motor stop (Switching off the internal combustion engine) has expired without the driver a start request to the drive device has communicated, for. B. by releasing the brake and / or Pressing and / or touching or pressing a Gear selection element. A scheduled delay time for the Shutdown of the engine is used for example as Rangierschutz, z. B. before engaging a reverse gear, so that the internal combustion engine is not switched off automatically if the vehicle is not at a traffic light or in a city traffic stops, but for maneuvering or Reversing was stopped. By the possibility, the To shorten or skip delay time by: the driver of the vehicle his driving desire the Drive device communicates, for example by touching a gear selector lever or other element also a speedy restart on short stops, z. For example Turn off while oncoming traffic allows.
• 13. An on-off switch for optional manual switch-on and switching off the stop-start function is on the power-on Condition, not in the off state.

advantages

By the functions of the numbers 1 to 6 and 12 , the necessary security (protection against incorrect operation) and a comfortable, simple and intuitive operation of the motor vehicle or its functions is guaranteed. Number 12 optimizes the function according to the driver's request, the driving style, the desired speed profile and the route. By the numbers 7 , 8 and 9 unnecessary cold starts and thus consumption, exhaust and wear disadvantages are prevented. By 11 deterioration of the availability and reliability of the starting process of the motor vehicle is prevented. By 10 prevents an unpleasant high humidity in the passenger compartment of the vehicle is produced and / or dampen the vehicle windows damp and thereby the driver loses sight.

The said delay time for the automatic shutdown of the internal combustion engine in a vehicle stop is preferably variable and is preferably influenced by the following parameters, wherein a short delay time means an early shutdown of the internal combustion engine, and a long delay time a later shutdown of the internal combustion engine means:

• 1. Due to the selection of an operating mode by the driver, z. B. via an economy selector switch or selector switch. In this case, an activation on the economy dial a small delay time and deactivation on economy Dialing cause a large delay time, the Delay time can be adjustable to infinity.
• 2. Due to the previous driving: Sporty driver with large pedal gradients (large and / or frequent Pedal movements of the accelerator pedal and / or the brake pedal per Time unit) give a large delay time, and economical drivers with small pedal gradients result in one small delay time.
• 3. Due to the speed profile covered: High Speeds, z. B. greater than 100 km / h, highway or Highway, resulting in a large delay time; small Speeds, z. B. less than 60 km / h, z. In the City traffic or stagnant traffic, make a small Delay Time; in between can mean Delay times are.
• 4. Based on navigation data of a navigation system or a traffic control system or digital road maps, for example, traffic jams a small Delay time can result. When the traffic flow is blocked, the internal combustion engine, provided the remaining driving conditions are fulfilled, immediately switched off become. In turn situations and crossing situations Large delay times can be set to one  disturbing shutdown in a turn-off situation or Prevent crossing situation.
• 5. Brake Pedal Angle: Small pedal actuation angle by the Brake pedal is slightly down, can be used for adjustment a large delay time can be used; size Brake pedal operating angle by the brake pedal strong is stepped, can a small delay time cause. However, the driver can over the brake pedal the Intuitively influence and control the function. The "brake pedal" Here is just one example of each type of Vehicle brake elements and vehicle Parkblockiereinrichtungen, such as a manual Vehicle parking brake or a foot parking brake.

When deciding to automatically start the internal combustion engine after an automatic stop, at least one or preferably more than one of the starting conditions mentioned in the sub-combination or preferably all of the patent applications must be fulfilled simultaneously as an AND function:

• 1. Hood closed: protection during maintenance or Workshop activities. Example: The driver drives his vehicle in the workshop or garage, stop, open the Hood lock, and while the mechanic is straight into the engine compartment, the driver releases the brake pedal, which is usually a signal for automatic startup and so that the automatic restart of the internal combustion engine is. In this case, it may not cause an engine restart come.
• 2. brake actuator, z. B. Brake pedal: When the vehicle brake (foot brake, handbrake, manual or foot-operated parking brake) is activated in the stop phase, the combustion engine is started independently of the brake pedal position when the accelerator pedal is depressed or when the vehicle brake is released. If the vehicle brake has not been actuated during the stophase, the following point 3 applies.
• 3. Brake pedal not actuated (released) or Vehicle speed exceeds a threshold, z. B. 5 km / h. This second case may still occur actuated brake pedal and idling the motor vehicle due to a heavy road gradient.
• 4. All vehicle doors must be closed, preferably also a trunk door or a boot lid, or at least the driver's door.
• 5. For an automatic transmission, the selector lever position must ever according to embodiment of the motor vehicle in one Forward driving position, z. B. D, or to neutral position, for. B. N, or parked, z. B. P, be.
• 6. Driver's seatbelt is worn and / or the buckle is closed: To rule out that the driver a unwanted engine start triggers unintentionally the Vehicle brake releases and / or presses the accelerator pedal, for example, by the driver in the vehicle on the Passenger seat slipped over to z. B. another driver To make room and thereby the brake is off, or the on driver sitting in the driver's seat turns around and backwards Look, for example, to get something from a backseat or busy there with a child. In such cases is an automatic engine start only when pressing the Accelerators, even if the driver Seat belt not worn or the buckle not closed.

expansion options

Triggering a motor stop already in deceleration phases or Coasting phases of the motor vehicle to fuel consumption to reduce. The prerequisite for this, however, is that the brake and steering with the engine off without restriction remain functional. If this is not possible, then according to another embodiment, an intermediate solution be provided, in which not only the full Vehicle stop, but already while rolling out the Motor vehicle is an automatic engine stop, but at  subsequent operation of the brake or the steering during the motor vehicle coasting phase an immediate engine restart automatically done. Furthermore, it can be provided a automatic engine stop only with active hill-hold function to perform a rolling back of the motor vehicle prevent. Furthermore, according to another embodiment be provided that an automatic restart of the automatically shut down internal combustion engine only at Pressing the accelerator pedal or another Gas actuator takes place, regardless of whether a manual (handbrake) or foot operated Vehicle brake, z. B. parking brake is in braking or Not. The advantage here: the normal vehicle brake, which does not serve to determine the motor vehicle, does not have be kept constantly pressed by the foot of a driver.

Claims (16)

1. A method for automatically switching off and starting an internal combustion engine ( 2 ) of a motor vehicle by means of a stop-start device ( 16 ) through which the internal combustion engine ( 2 ), after starting the internal combustion engine ( 2 ) by a person and driving the motor vehicle with the internal combustion engine ( 2 ) on, stopping the motor vehicle and concurrently as AND function of certain stop conditions to which at least the actuation of a motor vehicle brake ( 38 ) and a vehicle standstill or a vehicle standstill approximate low vehicle speed, is automatically switched off, and is then automatically restarted as AND function simultaneous presence of certain starting conditions, the automatic shutdown of the engine ( 2 ) by a stop function and the then taking place automatically starting the engine ( 2 ) by a start function of the stop - Starting means ( 16 ), characterized in that the function of the automatic shutdown and / or the automatic starting of the internal combustion engine in dependence on the respective operating state of a hood ( 26 ) takes place. 2. The method according to claim 1, characterized in that the starting conditions for an automatic starting of the internal combustion engine ( 2 ), which must be present as an AND function simultaneously, heard that the hood ( 26 ) is in the closed position. 3. The method according to any one of the preceding claims, characterized in that the starting conditions for an automatic starting of the internal combustion engine ( 2 ), which must be present as an AND function simultaneously, heard that the hood ( 26 ) is locked. 4. The method according to at least one of the preceding claims, characterized in that at hoods ( 26 ) which have two locking stages, of which a first locking stage locks the hood in its fully closed closed position and the second locking stage the hood in a slightly open, the fully closed closed position as far as approximate partial open position locked that the hand of an adult person can not extend through the opening gap in the engine compartment, to the starting conditions for automatic starting of the engine, which must be present as an AND function simultaneously, heard that the hood in the full closed position or at least in the partially open position and is locked at the same time by at least one of the two locking levels. 5. The method according to at least one of the preceding claims, characterized in that the starting conditions for an automatic starting of the internal combustion engine ( 2 ), which must be present as an AND function simultaneously, heard that the hood ( 26 ) unlocked and at the same time in the closed position , And that when not present these starting conditions of the internal combustion engine by the automatic start function is not automatically launched. 6. The method according to at least one of the preceding claims, characterized in that the starting conditions for an automatic starting of the internal combustion engine ( 2 ), which must be present as an AND function simultaneously, heard that the hood ( 26 ) is unlocked and at the same time in the closed position or at least in one of the closed positions as far as approximate partial open position is that the hand of an adult person can not extend through the opening gap in the engine compartment. 7. The method according to at least one of the preceding claims, characterized in that the internal combustion engine by the automatic stop function of the device ( 16 ) is automatically turned off when the engine hood ( 26 ) is opened in the locked state. 8. The method according to at least one of the preceding claims, characterized in that belongs to the stop conditions for an automatic shutdown of the internal combustion engine ( 2 ) that the hood ( 26 ) is closed, wherein the automatic shutdown is omitted and thus the internal combustion engine continues to run when the Bonnet is not closed. 9. The method according to at least one of the preceding claims, characterized in that the stop conditions for an automatic shutdown of the internal combustion engine ( 2 ) that the hood ( 26 ) is closed and locked, wherein the automatic shutdown is omitted and thus the internal combustion engine continues, if the bonnet is not closed or not locked. 10. The method according to at least one of the preceding claims, characterized in that in engine hoods ( 26 ) which have two locking stages, of which a first locking stage locks the hood in its fully closed closed position and the second locking stage in the hood in a slightly open, the fully closed closed position locked so far approximate partial open position that the hand of an adult person can not pass through the opening gap in the engine compartment, which is automatically started by the automatic stop function automatically disabled engine from the device when the first locking stage the hood in their unlocked fully closed position. 11. The method according to at least one of the preceding claims, characterized in that the stop-start function of the stop-start device ( 16 ) by a person on an intended on-off switching means and can be switched off. 12. The method according to at least one of the preceding claims, characterized in that the stop-start device ( 16 ) includes a priority circuit, by which the starting function takes priority over the stop function, when a person trained in automatically shut off the engine at one for an instant start Operating element generates an immediate start signal by which the automatically disconnected internal combustion engine is started, although not all starting conditions for an automatic start of the internal combustion engine by the stop-start device ( 16 ) are present. 13. The method according to at least one of the preceding claims, characterized in that at least the driver's door ( 40 ), or more or all motor vehicle doors are monitored by the stop-start device ( 16 ), whether they are closed or open, and that the automatic Shutdown and / or the automatic starting of the internal combustion engine depending on whether the respective motor vehicle door or relevant motor vehicle doors are closed or at least one motor vehicle door is open. 14. The method according to at least one of the preceding claims, characterized in that the automatic shutdown of the internal combustion engine ( 2 ) additionally takes place in dependence on the further stop condition that a stop-release state of a climate control device ( 22 ) is present, which for the air conditioning of the motor vehicle -Personenraumes a drive connected to the internal combustion engine or connectable unit in the form of a refrigerant compressor ( 44 ) and / or a blower ( 46 ), wherein the automatic shutdown takes place only if the stop release state as one of the stop conditions is present as an AND function at the same time as other stop conditions. 15. The method according to at least one of the preceding claims, characterized in that the automatic shutdown of the internal combustion engine ( 2 ) by the stop-start device of the stop-start device ( 16 ) in dependence on the operating state of an oil system ( 56 ) of a traction drive ( 6 ) takes place as a further stop condition which must be fulfilled as AND function simultaneously with all other stop conditions, wherein the automatic shutdown of the internal combustion engine ( 2 ) is omitted, although all other stop conditions, but not this further stop condition is met, and wherein the oil system ( 56 ) contains at least one oil pump ( 24 ). 16. Motor vehicle comprising an internal combustion engine ( 2 ) and a stop-start device ( 16 ) for automatically switching off and starting the internal combustion engine, by which the internal combustion engine, after turning on its ignition system and then starting the engine and a first time driving the motor vehicle with the annealed internal combustion engine, when stopping the motor vehicle and the simultaneous presence of certain stop conditions, which at least the operation of a motor vehicle brake ( 38 ) and a vehicle standstill or a vehicle standstill approximate low vehicle speed belong is automatically switched off and then in the presence of certain starting conditions to which at least one start signal to be fulfilled by a person and that the ignition system has not been switched off since the engine was switched off is automatically restarted, whereby the stoppunk tion of the stop-start device, the internal combustion engine is automatically switched off and then automatically restarted by the start function of the stop-start device, the internal combustion engine, characterized in that the stop-start device ( 16 ) part of an electronic control device ( 14 ) and is formed together with this for performing the method steps according to at least one of the preceding claims.