JP2011089480A - Cooling system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system for a vehicle, promptly and correctly detecting abnormality of the rotational speed of an electric cooling water pump caused by an increase in an air intrusion ratio in cooling water. <P>SOLUTION: This cooling system for the vehicle, cooling a cooling object device mounted in the vehicle, by circulating the cooling water by the electric cooling water pump 3 includes: a rotational speed detection means (a rotational speed sensor 20 or the like) detecting the rotational speed of the electric cooling water pump 3; a determination means 12 determining the occurrence of a state where a bearing in the electric cooling water pump 3 is insufficiently lubricated, when a detection value (rotational speed) by the rotational speed detection means exceeds a determining value; a variation means 13 stepwise lowering the determining value with lapse of rotation time of the electric cooling water pump 3; and a pump control means 14 controlling operation of the electric cooling water pump. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooling device for a vehicle, and is particularly suitable as a cooling device for a vehicle such as an electric vehicle (BEV) or a plug-in hybrid vehicle (PHEV).

  Conventionally, for example, a vehicle such as an electric vehicle has a cooling device that cools a cooling target device such as a drive motor or a vehicle-mounted charger. As such a cooling device, for example, a cooling fluid (cooling water) cooled by a radiator is supplied to an in-vehicle charger by an electric pump (electric cooling water pump), and is circulated between the in-vehicle charger and the radiator. There is a device that cools the device to be cooled (see, for example, Patent Document 1).

  As an electric cooling water pump constituting such a cooling device, for example, there is an electric cooling water pump that employs a fluid bearing using cooling water supplied from an air / water separation tank.

JP 7-31805 A

  Here, when the water level of the cooling water in the air / water separation tank is lowered, the air / water separation performance is deteriorated and air may be mixed into the cooling water. When cooling water mixed with air is supplied to an electric cooling water pump that employs a fluid bearing using cooling water, for example, an abnormality such as a significant increase in the rotational speed of the electric cooling water pump occurs. There is a risk of damaging it.

  For this reason, the rotational speed of the electric cooling water pump is monitored, and the rotational speed of the electric cooling water pump is abnormal (increased) due to an increase in air mixing into the cooling water (hereinafter referred to as “increase in air mixing rate”). In the case where it is determined whether or not there is an abnormality in the rotational speed, the rotation is stopped to prevent damage to the electric cooling water pump.

  However, the rotational speed of the electric cooling water pump may slightly fluctuate (decrease or increase) due to a plurality of factors. For this reason, there is a possibility that the increase in the air mixing rate cannot be detected early and accurately only by monitoring the rotational speed of the electric coolant pump.

  The present invention has been made in view of such circumstances, and provides a vehicle cooling device capable of accurately and quickly detecting an abnormality in the rotational speed of an electric cooling water pump due to an increase in the air mixing rate. With the goal.

  The present invention for solving the above-mentioned problems is a vehicle cooling device for cooling a cooling target device mounted on a vehicle by circulating cooling water by an electric cooling water pump, wherein the rotational speed of the electric cooling water pump is adjusted. A rotational speed detection means for detecting, and a determination means for determining that an insufficient lubrication of the bearing has occurred in the electric cooling water pump when a detection value by the rotational speed detection means exceeds a determination value; Immediately after the start of rotation of the electric coolant pump, fluctuation means for stepwise decreasing the determination value as the rotation time elapses, and operation of the electric coolant pump based on the determination result of the determination means And a pump control means for controlling the vehicle.

  In the present invention, even when the detection value (rotation speed) detected by the rotation speed detection means changes, the difference between the detection value and the determination value is maintained at an appropriate level regardless of the rotation time. And almost uniform. Thereby, it is determined early and accurately that the state in which the lubrication of the bearing is insufficient in the electric coolant pump is generated, and damage to the electric coolant pump can be appropriately prevented.

  According to a second aspect of the present invention, there is provided a motor temperature detecting means for detecting a temperature of a motor constituting the electric cooling water pump, wherein the changing means is based on a detection result of the motor temperature detecting means. The vehicle cooling device according to the first aspect is characterized in that the value is further varied.

  According to a third aspect of the present invention, in the vehicle cooling device according to the second aspect, the fluctuating means lowers the determination value as the temperature of the motor increases.

  In the second and third aspects, even if the detection value (rotation speed) detected by the rotation speed detection means changes according to the temperature of the motor (coil), the determination value is appropriately adjusted. The difference between the detection value and the determination value is maintained at an appropriate level and is substantially uniform regardless of the rotation time.

  According to a fourth aspect of the present invention, there is provided a water temperature detecting means for detecting a temperature of the cooling water supplied to the electric cooling water pump, and the changing means is based on a detection result of the water temperature detecting means. The vehicle cooling device according to any one of the first to third aspects is characterized in that the value is further varied.

  According to a fifth aspect of the present invention, in the vehicle cooling device according to the fourth aspect, the changing means increases the determination value as the temperature of the cooling water increases.

  In the fourth and fifth aspects, even if the detection value (rotation speed) detected by the rotation speed detection means changes according to the temperature of the cooling water, the detection value is appropriately adjusted to detect the detection value. The difference between the value and the determination value is maintained at an appropriate size regardless of the rotation time and is substantially uniformized.

  According to a sixth aspect of the present invention, there is provided voltage detection means for detecting an applied voltage applied to the electric cooling water pump, and the changing means determines the determination value based on a detection result of the voltage detection means. Further, the vehicle cooling device according to any one of the first to fifth aspects is characterized in that it is further varied.

  According to a seventh aspect of the present invention, in the vehicle cooling according to the sixth aspect, the fluctuating means increases the determination value as the applied voltage applied to the electric cooling water pump increases. In the device.

  In the sixth and seventh aspects, the determination value is appropriate even when the detection value (rotation speed) detected by the rotation speed detection means changes due to the applied voltage applied to the electric coolant pump. Thus, the difference between the detection value and the determination value is maintained at an appropriate level regardless of the rotation time and is substantially uniformized.

  As described above, in the vehicle cooling apparatus according to the present invention, the difference between the detection value (rotation speed) detected by the rotation speed detection means and the determination value is always maintained at an appropriate level and substantially uniform. . Therefore, regardless of the rotation time of the electric cooling water pump, it is determined early and accurately that the state of insufficient lubrication of the bearing has occurred in the electric cooling water pump due to an increase in the air mixing rate. It is possible to prevent damage to the water pump.

It is a schematic structure figure showing an example of a cooling device of vehicles concerning one embodiment of the present invention. It is a block diagram which shows a part of vehicle cooling device which concerns on Embodiment 1. FIG. It is a graph which shows an example of the relationship between rotation time and rotation speed. FIG. 5 is a block diagram illustrating a part of a vehicle cooling device according to a second embodiment. It is a graph which shows an example of the relationship between rotation time and rotation speed. It is a block diagram which shows a part of vehicle cooling device which concerns on Embodiment 3. FIG. It is a graph which shows an example of the relationship between rotation time and rotation speed. FIG. 6 is a block diagram illustrating a part of a vehicle cooling device according to a fourth embodiment. It is a graph which shows an example of the relationship between rotation time and rotation speed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram illustrating an example of a vehicle cooling device according to an embodiment of the present invention, and FIG. 2 is a block diagram illustrating a part of the vehicle cooling device according to the first embodiment. FIG. 3 is a graph showing an example of the relationship between the rotation time and the rotation speed of the electric cooling water pump.

  As shown in FIGS. 1 and 2, the cooling device 1 according to the present embodiment is mounted on an electric vehicle 100 and is mounted on a vehicle for charging a drive motor (M) 101, an inverter 102, and a battery (secondary battery) 104. A predetermined device (cooling target device) including the charger 103 is cooled. Specifically, the cooling device 1 stores the cooling water and separates the air / water separation tank 2 that separates the air and water, sucks the cooling water in the air / water separation tank 2, and supplies the sucked cooling water to the drive motor. An electric cooling water pump (WP) 3 that is sent to a cooling target device including 101, a radiator 4 that cools the cooling water that has been used for cooling the drive motor 101 and the like, and the temperature of the radiator 4 is forced. And a radiator fan 5 for blowing air, and a water pipe 6 is connected between them. The radiator fan 5 includes, for example, a cooling fan 5a and an electric motor 5b that rotates the cooling fan 5a.

  And the cooling device 1 is comprised so that each cooling object apparatus containing the drive motor 101 may be cooled by circulating cooling water from the radiator 4 into the water distribution pipe 6 by the electric cooling water pump 3. In addition to the drive motor 101, the cooling target device cooled by the cooling device 1 includes, for example, an inverter 102, an in-vehicle charger 103, a DC / DC converter (not shown), and the like.

  In addition, the electric vehicle 100 is provided with an electronic control unit (ECU) 10 that controls the electric vehicle 100. In the present embodiment, the cooling device 1 is also controlled by the ECU 10.

  Here, the electric cooling water pump 3 employs a fluid bearing that uses the cooling water itself for lubrication. For this reason, when the air mixing rate of the cooling water supplied from the steam / water separation tank 2 to the electric cooling water pump 3 increases, the bearing is not sufficiently lubricated and the fluid bearing does not function well. The water pump 3 may be damaged. Thus, it is known that when the air mixing rate of the cooling water is increased, the rotational speed of the electric cooling water pump 3 is significantly increased.

  Therefore, by monitoring the rotational speed of the electric cooling water pump 3, it is determined whether or not the bearing is insufficiently lubricated due to an increase in the air mixing rate. Specifically, when the rotational speed of the electric coolant pump 3 exceeds a preset determination value, it is determined that a state in which the bearing is insufficiently lubricated has occurred. When it is determined that the bearing is not sufficiently lubricated, the rotation is stopped immediately and the user is encouraged to refill the cooling water, and the electric cooling water pump 3 is damaged. Prevents it in advance.

  By the way, the rotational speed of the electric cooling water pump 3 may slightly vary with the passage of the rotation time even during normal operation where the bearing is not sufficiently lubricated. For example, immediately after the start of the rotation of the electric cooling water pump 3, the rotation speed gradually decreases as the rotation time elapses and then tends to stabilize. As described above, the rotational speed of the electric coolant pump 3 fluctuates with the lapse of the rotation time immediately after the start of rotation even during normal operation. Therefore, when the determination value is set to a constant value, The difference between the actual rotation speed and the determination value gradually increases with the rotation time. For this reason, there exists a possibility that the presence or absence of generation | occurrence | production of a state with insufficient lubrication of a bearing cannot be determined appropriately.

  Therefore, in the present invention, immediately after the start of the rotation of the electric coolant pump 3, the determination value is decreased stepwise as the rotation time elapses. As a result, the difference between the actual rotational speed and the judgment value becomes relatively small and uniform, so that the presence or absence of insufficient bearing lubrication can be judged early and accurately regardless of the rotational time. can do.

  In the present embodiment, as the rotational speed detecting means for detecting the rotational speed of the electric coolant pump 3, the electric coolant pump 3 includes a rotational speed sensor that detects the rotational speed of a motor (not shown) as a drive source. 20 is provided.

  The ECU 10 includes a time measuring unit 11, a determining unit 12, a changing unit 13, and a pump control unit 14. Here, only the means necessary for the determination process of the rotational speed of the electric coolant pump will be described here, but of course, the ECU 10 appropriately includes other means such as a means for controlling the electric vehicle 100, for example. Yes.

  The time measuring means 11 measures the elapsed time from the start of rotation of the electric coolant pump 3. Further, the determination means 12 determines whether or not the state in which the lubrication of the bearing is insufficient occurs in the electric coolant pump 3. For example, the determination means 12 takes in the detection value (rotation speed) detected by the rotation speed sensor 20, calculates the rotation speed per elapsed time, that is, the rotation speed, and determines the electric type from the relationship between the rotation speed and the determination value. It is determined whether or not a state in which the bearing is insufficiently lubricated has occurred in the cooling water pump 3. That is, the determination unit 12 determines that a state in which the bearing is insufficiently lubricated has occurred when the rotational speed of the electric coolant pump 3 is greater than the determination value.

  The fluctuating means 13 decreases the determination value stepwise as the rotation time elapses immediately after the electric cooling water pump 3 starts rotating. That is, the changing means 13 refers to the map of the rotation time and the determination value set based on the relationship between the rotation time and the rotation speed of the electric coolant pump 3 and based on the measurement result of the time measuring means 11. The determination value is lowered at a predetermined timing. The pump control unit 14 controls the operation of the electric coolant pump 3 based on the determination result of the determination unit 12. For example, the pump control unit 14 stops the rotation of the electric coolant pump 3 when the determination unit 12 determines that a state in which the bearing is not sufficiently lubricated has occurred.

  When the electric cooling water pump 3 starts to rotate, as shown in FIG. 3, the rotational speed reaches a maximum value at a time T1 after several seconds, and then stabilizes after gradually decreasing to a time T2 of several minutes. Showing change. For this reason, the fluctuating means 13 according to the present embodiment first reduces the determination value from the predetermined value A to the predetermined value B at a time T3 between the time T1 and the time T2, and further the rotational speed of the electric coolant pump 3 is increased. The determination value is further lowered from the predetermined value B to the predetermined value C in the vicinity of the stabilization time T2. The values of the predetermined values A to C are appropriately determined in consideration of the rotation speed when the bearing is insufficiently lubricated so as not to fall below the actual rotation speed of the electric coolant pump 3. ing.

  As described above, immediately after the electric cooling water pump 3 starts rotating, the difference between the rotational speed and the determination value can be suppressed to be relatively small by changing (decreasing) the determination value stepwise as the rotation time elapses. In addition, it becomes almost uniform. As a result, it is possible to quickly and accurately determine a state in which the bearing is insufficiently lubricated regardless of the rotation time. That is, the sensitivity for detecting an abnormality (increase) in the rotational speed of the electric cooling water pump 3 can be favorably maintained regardless of the rotation time. Therefore, it is possible to prevent damage to the electric coolant pump 3 due to insufficient lubrication of the bearing.

  In the present embodiment, the determination value is changed twice including the time T2 between the time T1 and the time T2. Of course, the determination value is set between the time T1 and the time T2. It may be changed only once or a plurality of times more than three times. As a result, the difference between the actual rotational speed and the determination value is made uniform according to the actual condition, so that the determination accuracy in a state where the bearing is insufficiently lubricated can be improved as necessary.

(Embodiment 2)
FIG. 4 is a block diagram illustrating the vehicle cooling device according to the second embodiment, and FIG. 5 is a graph illustrating an example of the relationship between the rotation time and the rotation speed of the electric coolant pump. In addition, the same code | symbol is attached | subjected to the same member and the overlapping description is abbreviate | omitted.

  As described in the first embodiment, even during normal operation in which the bearing is not sufficiently lubricated, the rotational speed of the electric cooling water pump 3 is slightly increased as the rotation time elapses. Variations occur. For example, when the temperature of the motor (coil) constituting the electric coolant pump 3 rises due to Joule heat generated by energization, the electrical resistance of the motor (coil) increases and the energization current to the motor (coil) gradually decreases. Thus, the rotational speed of the electric cooling water pump 3 gradually decreases. For example, when the electric coolant pump 3 is intermittently operated, the rotational speed (dotted line) after the intermittent operation is repeated a predetermined number of times is slower than the initial rotational speed (solid line), as shown in FIG.

  Therefore, in the present embodiment, as described above, immediately after the rotation of the electric coolant pump 3 is started, the determination value is decreased stepwise as the rotation time elapses, and the motor ( The temperature of the coil) is detected, and the determination value is further varied according to the detection result.

  Specifically, in this embodiment, as shown in FIG. 4, the electric cooling water pump 3 is further provided with a motor temperature sensor (motor temperature detecting means) 21 for detecting the temperature of the motor (coil). Yes. Then, the fluctuation means 13 gradually decreases the determination value with the passage of the rotation time as described above, and further varies the determination value based on the detection result of the motor temperature sensor 21. In the present embodiment, the fluctuating means 13 takes in the detection result of the motor temperature sensor 21 and refers to, for example, a map of the temperature of the motor and the determination value or the like of the motor (coil) of the electric coolant pump 3. The judgment value is lowered as the temperature rises.

  For example, as shown in FIG. 5, in the initial stage of intermittent operation, the determination value is set to a predetermined value A corresponding to the rotational speed of the electric coolant pump 3 (shown by a solid line in the figure). When the temperature of the motor (coil) of the electric coolant pump 3 rises while repeating the intermittent operation a predetermined number of times, the rotational speed of the electric coolant pump 3 decreases (shown by the dotted line in the figure). ), The determination value is set to a predetermined value D smaller than the predetermined value A. In addition, the frequency | count which fluctuates a determination value in this way is not specifically limited, One time or multiple times may be sufficient, and what is necessary is just to be determined suitably as needed.

  In such a configuration of the present embodiment, the difference between the actual rotation speed and the determination value is further reduced and substantially uniformed. Therefore, the presence or absence of occurrence of insufficient lubrication of the bearing can be determined earlier and accurately.

(Embodiment 3)
FIG. 6 is a block diagram illustrating a vehicle cooling device according to the third embodiment, and FIG. 7 is a graph illustrating an example of a relationship between a rotation time and a rotation speed of the electric coolant pump. In addition, the same code | symbol is attached | subjected to the same member and the overlapping description is abbreviate | omitted.

  As described in the first embodiment, the rotational speed of the electric cooling water pump 3 slightly varies with the passage of the rotation time even during normal operation where insufficient lubrication of the bearing has not occurred. Occurs. For example, when the temperature of the cooling water supplied to the electric cooling water pump 3 increases, the viscosity of the cooling water decreases and the rotation speed of the electric cooling water pump 3 increases. For example, when the electric cooling water pump 3 is intermittently operated, as shown in FIG. 7, the rotational speed after the intermittent operation is repeated a predetermined number of times (indicated by a dotted line in the figure) is the initial stage rotational speed (solid line in the figure). Faster).

  Therefore, in the present embodiment, as described in the first embodiment, immediately after the rotation of the electric coolant pump 3 is started, the determination value is decreased stepwise as the rotation time elapses, and the electric coolant pump 3 is The temperature of the supplied cooling water is detected, and the determination value is further varied according to the detection result.

  Specifically, in the present embodiment, as shown in FIG. 6, the electric cooling water pump 3 includes a water temperature sensor (water temperature detecting means) 22 that detects the temperature of the cooling water supplied from the steam separation tank 2. Is further provided. And the fluctuation | variation means 13 changes a determination value further based on the detection result of the water temperature sensor 22 while reducing a determination value in steps as progress of rotation time as mentioned above. In the present embodiment, the fluctuating means 13 takes in the detection result of the water temperature sensor 22 and refers to a map of the cooling water temperature and the determination value to increase the determination value as the cooling water temperature rises. ing.

  For example, as shown in FIG. 7, in the initial stage of intermittent operation, the determination value is set to a predetermined value A corresponding to the rotational speed of the electric coolant pump 3 (shown by a solid line in the figure). When the temperature of the cooling water rises while repeating the intermittent operation a predetermined number of times, the rotational speed of the electric cooling water pump 3 rises (indicated by the dotted line in the figure), so that the determination value is greater than the predetermined value A. Is set to a large predetermined value E. The number of times that the determination value is varied is not particularly limited, and may be one time or a plurality of times, and may be appropriately determined as necessary.

  In such a configuration of the present embodiment, the difference between the actual rotation speed and the determination value is further reduced and uniformed. Therefore, the presence or absence of occurrence of insufficient lubrication of the bearing can be determined earlier and accurately.

  In the present embodiment, the water temperature sensor 22 is provided in the electric cooling water pump 3. However, the position where the water temperature sensor 22 is provided is electric if the temperature of the cooling water supplied to the electric cooling water pump 3 can be detected. You may make it provide in parts other than the type | formula cooling water pump 3, for example, the water pipe 6 grade | etc.,.

(Embodiment 4)
FIG. 8 is a block diagram illustrating a vehicle cooling device according to the fourth embodiment, and FIG. 9 is a graph illustrating an example of a relationship between a rotation time and a rotation speed of the electric coolant pump.

  As described in the first embodiment, even during normal operation in which the bearing is not sufficiently lubricated, the rotational speed of the electric cooling water pump 3 is slightly increased as the rotation time elapses. Variations occur. For example, the applied voltage applied to the motor of the electric coolant pump 3 may change, and the rotational speed of the electric coolant pump 3 may change accordingly. For example, when the electric cooling water pump 3 is intermittently operated, as shown in FIG. 9, as the intermittent operation is repeated, the rotational speed (indicated by the dotted line in the figure) is higher than the normal rotational speed (indicated by the solid line in the figure). ) May be indicated. Of course, the rotation speed may be slower than usual.

  Therefore, in the present embodiment, as described in the first embodiment, immediately after the rotation of the electric coolant pump 3 is started, the determination value is decreased stepwise as the rotation time elapses, and the electric coolant pump 3 The applied voltage applied to the motor is detected, and the determination value is further varied according to the detection result.

  Specifically, in the present embodiment, as shown in FIG. 8, the electric coolant pump 3 is provided with a voltage sensor (voltage detection means) 23 that detects an applied voltage. Of course, the configuration of the voltage detection means is not particularly limited as long as the voltage applied to the motor of the electric coolant pump 3 can be detected. For example, the voltage detection means may detect the voltage of the battery and estimate the applied voltage from the detection result.

  The variation means 13 gradually decreases the determination value with the passage of the rotation time as described above, and further varies the determination value based on the detection result of the voltage sensor 23. In the present embodiment, the fluctuation means 13 takes in the detection result of the voltage sensor 23, refers to a map of the applied voltage and the judgment value (rotation speed), etc., and varies the judgment value along with the fluctuation of the applied voltage. Yes.

  For example, as shown in FIG. 9, the determination value is set to a predetermined value A when rotating at a normal rotation speed (indicated by a solid line in the figure). If the voltage applied to the electric cooling water pump 3 increases while repeating the intermittent operation a predetermined number of times, the rotational speed of the electric cooling water pump 3 increases (indicated by the dotted line in the figure). The value is set to a predetermined value F larger than the predetermined value A. The number of times that the determination value is varied is not particularly limited, and may be one time or a plurality of times, and may be appropriately determined as necessary.

  In such a configuration of the present embodiment, the difference between the actual rotational speed and the determination value is further suppressed and made uniform. Therefore, it can be determined earlier and accurately whether or not the bearing is insufficiently lubricated.

  As mentioned above, although embodiment of this invention was described, of course, this invention is not limited to these embodiment.

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Air-water separation tank 3 Electric cooling water pump 4 Radiator 5 Radiator fan 5a Cooling fan 5b Electric motor 6 Water distribution pipe 10 ECU
DESCRIPTION OF SYMBOLS 11 Time measuring means 12 Judging means 13 Fluctuating means 14 Pump control means 20 Rotational speed sensor 21 Motor temperature sensor 22 Water temperature sensor 23 Voltage sensor 100 Electric vehicle 101 Drive motor 102 Inverter 103 In-vehicle charger 104 Battery

Claims (7)

A cooling device for a vehicle that circulates cooling water by an electric cooling water pump and cools a cooling target device mounted on the vehicle,
A rotational speed detecting means for detecting the rotational speed of the electric coolant pump;
A determination means for determining that an insufficient lubrication of the bearing has occurred in the electric cooling water pump when a detection value by the rotation speed detection means exceeds a determination value;
Immediately after the start of the rotation of the electric cooling water pump, fluctuating means for gradually reducing the determination value with the passage of the rotation time;
Pump control means for controlling the operation of the electric coolant pump based on the determination result of the determination means;
A vehicle cooling device comprising: Motor temperature detecting means for detecting the temperature of the motor constituting the electric cooling water pump;
2. The vehicle cooling apparatus according to claim 1, wherein the changing unit further changes the determination value based on a detection result of the motor temperature detecting unit.   The vehicle cooling device according to claim 2, wherein the fluctuating unit decreases the magnitude of the determination value as the temperature of the motor increases. Comprising water temperature detection means for detecting the temperature of the cooling water supplied to the electric cooling water pump,
The vehicle cooling device according to any one of claims 1 to 3, wherein the changing unit further changes the determination value based on a detection result of the water temperature detecting unit.   5. The vehicle cooling device according to claim 4, wherein the fluctuating unit increases the determination value as the temperature of the cooling water increases. Voltage detecting means for detecting an applied voltage applied to the electric cooling water pump;
6. The vehicle cooling apparatus according to claim 1, wherein the changing unit further changes the determination value based on a detection result of the voltage detecting unit.   The said cooling means raises the said determination value with the raise of the applied voltage applied to the said electrically driven cooling water pump, The cooling device of the vehicle of Claim 6 characterized by the above-mentioned.

Images