JP2010069898A - Vehicular cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular cooling system which reduces travel wind passing through an introduction passage of one heat exchanger according to an operating state of a vehicle, thereby improving the cooling performance of the other heat exchanger. <P>SOLUTION: When the cooling of an intercooler 15 takes priority over the cooling of a so-called radiator 4 as the increase of travel wind to be supplied to the intercooler 15 is determined, the vehicular cooling system decreases the amount of travel wind passing through the radiator 4 and a fan shroud 5, and thus can lower a pressure inside an engine compartment 1 in comparison with the pressure applied before decreasing the amount of travel wind passing through the radiator 4 and the fan shroud 5, thereby capable of increasing the amount of travel wind introduced into an intercooler duct 19 due to the difference in pressure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicular cooling apparatus having two heat exchangers, and particularly enables adjustment of the amount of traveling wind passing through an introduction path in accordance with the driving state of the vehicle.

  In general, cooling by the radiator is performed by using the traveling wind of the vehicle, but when the engine coolant temperature is low, there is a possibility of overcooling. Therefore, a radiator shutter is provided on the radiator grill, and the coolant temperature is low. Sometimes, a grill shutter is closed to prevent overcooling and deterioration of the heating function (Patent Document 1).

  On the other hand, in recent years, a vehicle equipped with a supercharger is equipped with an intercooler accompanying the supercharger. As with the radiator, the intercooler performs heat exchange using the traveling wind generated as the vehicle travels, and thus it is necessary to effectively utilize the traveling wind. Patent Document 2 proposes a configuration in which a radiator and an intercooler are arranged in parallel with respect to the traveling wind, and an air volume adjusting guide for adjusting the air volume ratio is installed between the radiator and the intercooler.

  In Patent Document 2, when the engine coolant temperature rises, the traveling airflow flowing to the radiator side is increased as compared to before that, and at the time of high speed traveling, the traveling airflow introduced on the intercooler side is increased. Can be distributed effectively.

Japanese Utility Model Publication No. 58-25226 JP-A-2005-112186

  By the way, from the viewpoint of reducing the height of the bonnet, the intercooler is generally disposed above the transmission that hits the rear of the engine, and an intercooler introduction path opening is provided in the bonnet.

  In Patent Document 2, the intercooler and the radiator are arranged in parallel, and the opening for introducing the traveling wind is arranged adjacently, so that there is one so-called opening area, so that the air volume adjustment guide can be controlled to swing around the fulcrum. It is. However, the intercooler is usually arranged at the rear of the engine and the opening for introducing the running wind is installed at the front of the bonnet, whereas the opening of the radiator is arranged in the area of the radiator grille at the front of the engine. Since the opening is located behind the grill, it is difficult to increase or decrease the ratio of the opening area with a single air volume adjustment guide.

  An object of the present invention is to reduce a traveling wind passing through an introduction path of one heat exchanger in a vehicle cooling device having two heat exchangers having different traveling wind introduction paths in accordance with a driving state of the vehicle. Thus, it is to provide a vehicular cooling device capable of improving the cooling performance of the other heat exchanger.

  The first aspect of the present invention is a first heat exchanger, a first introduction path for introducing traveling air into the first heat exchanger, a second heat exchanger, and introducing traveling air into the second heat exchanger. A vehicle cooling device that discharges the traveling wind that has exchanged heat with the first and second heat exchangers into the engine room, and travels through the first introduction path. An air volume adjusting means for adjusting the air volume, and an increase determining means for determining whether or not to increase the traveling wind supplied to the second heat exchanger based on the vehicle operating state, are supplied to the second heat exchanger. When it is determined that the amount of travel air to be increased is increased, the amount of travel air passing through the first introduction path is reduced.

  In the first aspect of the invention, when the increase determination means determines that it is necessary to increase the travel wind supplied to the second heat exchanger, the travel air volume passing through the first introduction path is decreased. Can be made lower than before the travel air volume passing through the first introduction path is reduced.

  The invention according to claim 2 is the invention according to claim 1, wherein the first heat exchanger is a radiator disposed in front of the engine, and the second heat exchanger is an intercooler disposed above the engine. It is characterized by that.

  According to a third aspect of the present invention, there is provided the intercooler according to the second aspect, wherein when the vehicle is lower than a predetermined vehicle speed and an acceleration operation is performed, the amount of traveling air passing through the first introduction path is reduced. The pressure due to the traveling wind around the opening is lower than before reducing the traveling air volume.

  According to a fourth aspect of the present invention, in the invention according to the second or third aspect, the air volume adjusting means adjusts the traveling wind passing through the upper region of the radiator.

  According to a fifth aspect of the present invention, in the third aspect of the invention, there is provided a cooling water temperature detecting means for detecting a cooling water temperature of the engine, and when the cooling water temperature is equal to or higher than a predetermined value, the traveling air volume is reduced by the air volume adjusting means. Is prohibited.

  According to the first aspect of the present invention, it is determined whether or not to increase the amount of traveling air supplied to the second heat exchanger based on the vehicle operating state and the air volume adjusting means for adjusting the amount of traveling air passing through the first introduction path. An increase determining means, and when it is determined to increase the travel wind supplied to the second heat exchanger, the travel air volume passing through the first introduction path is decreased, so that the travel wind is reduced according to the driving state of the vehicle. The cooling performance of the second heat exchanger can be improved by reducing the traveling wind passing through the introduction path of the first heat exchanger.

  That is, since the pressure in the engine room can be lowered compared to before the amount of travel air passing through the first introduction path is reduced, the second introduction path can be generated by a pressure difference without providing a separate travel air introduction mechanism such as an electric fan. It is possible to increase the amount of travel air introduced into the vehicle. Moreover, since the pressure in the engine room is used, the cooling performance of the heat exchanger can be improved using the original structure regardless of the arrangement position and the introduction path structure.

  According to the invention of claim 2, the first heat exchanger is a radiator disposed in front of the engine, and the second heat exchanger is an intercooler disposed above the engine. Cooling efficiency is increased and output is improved.

  According to the invention of claim 3, when the vehicle is lower than the predetermined vehicle speed and an acceleration operation is performed, the travel airflow around the opening of the intercooler is reduced by reducing the travel airflow passing through the first introduction path. Therefore, the acceleration performance can be improved without hindering the cooling effect of the radiator and without providing a separate running wind introduction mechanism.

  According to the invention of claim 4, since the air volume adjusting means adjusts the traveling wind passing over the radiator, the traveling wind passing through the upper area of the radiator can be reduced, so the opening of the intercooler provided above the engine The pressure around the part can be made lower than before reducing the traveling air volume, and the acceleration performance can be improved.

  According to the invention of claim 5, the cooling water temperature detecting means for detecting the cooling water temperature of the engine is provided, and when the cooling water temperature is equal to or higher than a predetermined value, the reduction of the traveling air volume by the air volume adjusting means is prohibited. Overheating due to cooling water rise can be prevented.

  Hereinafter, the best mode for carrying out the present invention will be described.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a structure in an engine room having a cooling device according to an embodiment of the present invention, FIG. 1 is a front view showing the arrangement of each device, and FIG. 2 is a side view thereof.

  As shown in FIGS. 1 and 2, an engine 2 and a transmission 3 connected to the engine 2 are installed in the engine room 1, and a radiator 4 is provided in front of them. An electric fan (not shown) for forced cooling of the radiator and a fan shroud 5 surrounding the radiator are provided behind the radiator 4, and the fan shroud 5 is fixed to the radiator 4 by a radial mounting member. The radiator 4 and the fan shroud 5 correspond to the first path.

  A sub tank 6 is provided above the fan shroud 5. The sub-tank 6 always stores an appropriate amount of cooling water, is connected to a radiator tank (not shown), and takes in cooling water from the radiator tank or the like when the volume of the cooling water in the radiator tank changes according to temperature. The tank is replenished with cooling water to keep the state of the radiator tank constant. A bracket extends from the front portion of the sub tank 6, and the radiator 4 is fixed to the upper shroud 7.

  A radiator grille 8 is installed in front of the radiator 4 at the front end portion of the vehicle so as to allow the traveling wind to communicate with the front and rear in a slit shape. In the upper region of the radiator grille 8, air volume adjusting means 9 is integrally provided corresponding to the upper region of the radiator 4. The air volume adjusting means 9 includes a plurality of plate shutter members 10, a plurality of rotating shafts 11 that pivotally support the shutter members 10 in an open position and a closed position, and the shutter members 10 via link members 12. And an actuator 13 that is rotated.

  An air cleaner 14 is disposed behind the sub tank 6, and a downstream side of the air cleaner 14 is connected to the engine 2 via a throttle valve, a surge tank, a supercharger, an intercooler 15 and the like (not shown). The upstream of the air cleaner 14 is connected to a fresh air duct 17 supported by the vehicle body by a mount member 16.

  A rectangular tube-shaped intercooler duct 19 extending in the vehicle front-rear direction is arranged at a position above the sub-tank 6 in a substantially central part of the vehicle body, that is, at the center part of the back surface of the bonnet 18. The intercooler duct 19 guides the traveling air to the heat exchanger (not shown) of the intercooler 15 for cooling the intake air. The top wall 20 provided on the back surface of the bonnet 18, the side wall 21, the bottom wall 22, It is comprised from the introduction opening 23 and the discharge opening 24 (opening part of an intercooler). The intercooler duct 19 corresponds to the second path.

  A guide portion 25 is formed in front of the introduction opening 23 using the upper shroud 7. This guide portion 25 ensures a large opening area in the front and actively guides the traveling wind into the intercooler duct 19, and is constituted by a ceiling wall 26 and an upper shroud 7 provided on the back surface of the bonnet 18. Is done.

  The discharge opening 24 is located above the engine 2 and is disposed so that the traveling wind that has finished heat exchange from above the engine 2 toward the dash panel 27 is discharged. That is, the traveling wind that has passed through the fan shroud 5 passes through the side and upper side of the engine 2 after heat exchange with the radiator 4, and passes through the discharge opening 24 in the space formed by the engine 2 and the dash panel 27. It is configured to merge with the discharged traveling wind.

Next, based on FIG.3 and FIG.4, the control system of the cooling device which concerns on a present Example is demonstrated.
As shown in the block of FIG. 3, the control unit 28 of the engine 2 includes a cooling water temperature sensor 29 that detects the cooling water temperature of the engine 2, an accelerator opening sensor 30 that detects the depression amount of the accelerator pedal, and the traveling speed of the vehicle. Each detection signal is input from the vehicle speed sensor 31 for detecting the vehicle.

  The control unit 28 includes an increase determination unit 32 (increase determination means) that determines an increase in traveling wind supplied to the intercooler 15 when the vehicle is below a predetermined vehicle speed, for example, 80 km / h and an acceleration operation is performed. ing. When the increase determination unit 32 determines the increase, the control unit 28 issues an operation command to the actuator 13 to cause the air volume adjusting means 9 to be closed. That is, when the actuator 13 operates the link member 12 and closes the shutter member 10, traveling wind passing through the radiator grille 8 is reduced, and as a result, it passes through the radiator 4 and the fan shroud 5. The traveling wind (A1) is smaller than the traveling wind (A1 + A2) when the shutter member 10 is opened.

  Further, the control unit 28 performs overheat determination and high-speed traveling determination. As shown in FIG. 4, in the overheat determination, when the coolant temperature of the engine 2 reaches a predetermined temperature, for example, 95 ° C. or more, the air volume adjusting means 9 is forcibly opened. In the high-speed running determination, the air volume adjusting means 9 is forcibly opened when the vehicle is at a predetermined vehicle speed, for example, 80 km / h or more. The forced valve opening control based on the overheat determination and the high speed traveling determination is performed with priority over the valve closing operation of the air volume adjusting means 9 based on the increase determination.

Next, based on the flowchart of FIG. 5, the control process of the cooling device according to the present embodiment will be described. Si (i = 1, 2,...) Indicates each step.
First, the vehicle speed Sv, the coolant temperature Tw, and the accelerator opening degree θ are read from each sensor (S1), and the process proceeds to S2. As a result of the determination in S2, if the cooling water temperature is t1, for example, 60 ° C. or less, the engine is warming up, the air volume adjusting means 9 is closed (S3), and the process returns.

  As a result of the determination in S2, in the case of No, it is determined whether the cooling water temperature Tw is t2, for example, 95 ° C. or more (S4). If the result of determination in S4 is No, it is determined whether the vehicle speed Sv is s1, for example, 80 km / h or more (S5). If the result of determination in S5 is No, it is determined whether there is an accelerating request from the passenger (S6). If the result of determination in S6 is Yes, the process proceeds to S3. The acceleration request of the occupant is determined when the accelerator opening θ is a predetermined opening θ1, for example, 50% or more, but it can be used together with the rate of change of the accelerator opening θ.

  If the result of determination in S4 is Yes, the air volume adjusting means 9 is forcibly opened to avoid overheating (S7). As a result of the determination in S5, in the case of Yes, since the vehicle is traveling at a high vehicle speed and it is necessary to maintain the traveling performance, the air volume adjusting means 9 is forcibly opened to suppress the rise in the cooling water temperature ( S7). If the result of determination in S6 is No, warm-up is completed, the vehicle speed is low, and there is no acceleration request. Therefore, the air volume adjusting means 9 is forcibly opened to give priority to the cooling performance of the radiator 4 (S7). To return.

Next, functions and effects of the cooling device according to the present embodiment will be described.
When it is determined that the amount of traveling air supplied to the intercooler 15 is increased, if the cooling of the intercooler 15 is prioritized over the cooling of the so-called radiator 4, the amount of traveling air passing through the radiator 4 and the fan shroud 5 is reduced. Since the pressure in the engine room 1 can be made lower than before the amount of traveling air passing through the radiator 4 and the fan shroud 5 is reduced, the amount of traveling air introduced into the intercooler duct 19 can be increased by this pressure difference. it can.

  Further, when the vehicle is lower than the predetermined vehicle speed and an acceleration operation is performed, the cooling effect of the radiator 4 is reduced in order to reduce the pressure caused by the traveling wind around the discharge opening 24 of the intercooler 15 as compared with before reducing the traveling air volume. Acceleration performance can be improved without hindering.

  The area facing the discharge opening 24 is a space covered with the engine 2, the dash panel 27, the bonnet 18 and an under cover (not shown), so that there is little gap and the air that has entered the engine room 1 tends to stay. Is in a state. In particular, during traveling of the vehicle, the traveling wind that has passed through the fan shroud 5 becomes a resistance that hinders the progress of the exhaust air from the exhaust opening 24. Since the air volume adjusting means 9 reduces the traveling wind passing over the radiator 4 and the fan shroud 5, the resistance of the exhaust air from the exhaust opening 24 provided above the engine can be reduced, and the pressure in the engine room 1 can be reduced. The combined synergistic effect can further improve acceleration performance.

  Further, when the cooling water temperature is equal to or higher than a predetermined value, the reduction of the traveling air volume by the air volume adjusting means 9 is prohibited, so that overheating due to the rising of the cooling water of the engine 2 can be prevented. In addition, because of pressure control by opening and closing in the engine room 1, the cooling performance of the intercooler 15 can be improved using the original structure regardless of the arrangement position of the equipment and the structure of the introduction path of the traveling wind.

  In addition, various modifications can be added without departing from the spirit of the present invention. The air volume adjusting means 9 is not limited to the structure of the present embodiment, and any mechanism that can block the traveling wind may be used, and the increase determination criterion is not limited to the acceleration request, and the case where the demand of the radiator is low. It is also possible to set a standard.

It is a front view which shows arrangement | positioning of each apparatus in the engine room which concerns on the Example of this invention. It is a side view which shows arrangement | positioning of each apparatus in the engine room which concerns on the Example of this invention. It is a control block diagram of the cooling device when the air volume adjusting means is closed. It is a control block diagram of the cooling device when the air volume adjusting means is opened. It is a control flow of the cooling device which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room 2 Engine 4 Radiator 5 Fan shroud 9 Air volume adjustment means 15 Intercooler 19 Intercooler duct 24 (intercooler) discharge opening 29 Cooling water temperature sensor 30 Accelerator opening sensor 31 Vehicle speed sensor 32 Increase determination part

Claims (5)

A first heat exchanger, a first introduction path for introducing traveling air into the first heat exchanger, a second heat exchanger, and a second introduction path for introducing traveling air into the second heat exchanger. A vehicular cooling device that discharges the traveling wind that has been heat-exchanged with the first and second heat exchangers into the engine room;
An air volume adjusting means for adjusting a traveling air volume passing through the first introduction path;
An increase determination means for determining whether or not to increase the traveling wind supplied to the second heat exchanger based on the vehicle operating state;
The vehicle cooling device according to claim 1, wherein when it is determined that the amount of traveling air supplied to the second heat exchanger is increased, the amount of traveling air passing through the first introduction path is decreased.   The vehicular cooling device according to claim 1, wherein the first heat exchanger is a radiator disposed in front of the engine, and the second heat exchanger is an intercooler disposed above the engine.   When the vehicle is lower than a predetermined vehicle speed and an acceleration operation is performed, before the travel air volume is reduced by reducing the travel air volume passing through the first introduction path, the pressure caused by the travel wind around the opening of the intercooler is reduced. The vehicular cooling device according to claim 2, wherein the vehicular cooling device is lowered.   The vehicle cooling device according to claim 2 or 3, wherein the air volume adjusting means adjusts traveling wind passing through an upper region of the radiator. A cooling water temperature detecting means for detecting the cooling water temperature of the engine;
The vehicular cooling device according to claim 3, wherein when the cooling water temperature is equal to or higher than a predetermined value, a reduction in travel air volume by the air volume adjusting means is prohibited.