JP5182073B2 - Cooling abnormality detection device and cooling abnormality detection method - Google Patents

Description

  The present invention relates to a cooling abnormality detection device and a cooling abnormality detection method for detecting an abnormality of a cooling device that circulates a cooling fluid with a pump to cool an inverter.

Conventionally, when a failure (driving stop) of a blower fan that cools the current control element is detected, the current control element is prevented from being damaged by limiting the output torque of the motor (see, for example, Patent Document 1). ).
JP-A-6-98404

By the way, in the case of water cooling, cooling water is circulated by a water pump to cool an inverter or the like. At this time, even if a failure (driving stop) of the water pump can be detected, a poor circulation of the cooling water due to a leakage of the cooling water cannot be detected.
Therefore, an object of the present invention is to provide a cooling abnormality detection device and a cooling abnormality detection method for detecting a cooling fluid circulation failure of a cooling device that circulates a cooling fluid to cool an inverter.

In order to solve the above-described problem, the cooling abnormality detection device according to the present invention detects the element temperature of the inverter by the inverter temperature detection means, and detects the temperature of the cooling fluid in the cooling fluid path by the fluid temperature detection means. Then, the circulation failure determination means determines whether or not the cooling fluid circulation failure has occurred based on the temperature difference between the inverter temperature detected by the inverter temperature detection means and the fluid temperature detected by the fluid temperature detection means. To do.
Here, the fluid temperature detecting means detects the fluid temperature in the cooling fluid path provided in the inverter. Further, the circulation failure judging means determines that the circulation failure of the cooling fluid has occurred when the temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detection means from the inverter temperature detected by the inverter temperature detection means is smaller than a predetermined value. to decide.

  According to the cooling abnormality detection device of the present invention, it is possible to detect that the temperature difference between the inverter temperature and the fluid temperature becomes abnormally large or small with respect to the case where the cooling fluid is normally circulated. Can do. Thereby, it is possible to properly detect the circulation failure of the cooling fluid due to the leakage of the cooling fluid.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< First Embodiment >>
"Constitution"
FIG. 1 is a schematic configuration diagram when the present invention is applied to a four-wheel drive vehicle.
As shown in FIG. 1, in the vehicle of this embodiment, left and right front wheels 1L and 1R are main drive wheels driven by an engine 2 that is a heat engine (internal combustion engine), and left and right rear wheels 3L and 3R are motors. 4 is a driven wheel that can be driven by the motor 4.

  For example, a main throttle valve and a sub-throttle valve are interposed in the intake pipe line of the engine 2. The throttle opening of the main throttle valve is adjusted and controlled according to the amount of depression of the accelerator pedal. A step motor or the like is used as an actuator, and the opening degree of the sub-throttle valve is adjusted and controlled by a rotation angle corresponding to the number of steps. Therefore, by adjusting the throttle opening of the sub-throttle valve to be equal to or less than the opening of the main throttle valve, the engine output torque can be reduced independently of the driver's operation of the accelerator pedal. That is, the adjustment of the opening of the sub-throttle valve is the driving force control that suppresses the acceleration slip of the front wheels 1L, 1R by the engine 2.

The output torque of the engine 2 is transmitted to the left and right front wheels 1L and 1R through the transmission and the reference gear 5. Further, a part of the output torque of the engine 2 is transmitted to the generator 7 via the endless belt 6, so that the generator 7 can rotate the pulleys 2 a and 7 a to the rotational speed of the engine 2 (hereinafter referred to as engine rotational speed). It rotates at the number of rotations multiplied by the pulley ratio (hereinafter referred to as generator rotation number).
The generator 7 becomes a load on the engine 2 according to the field current adjusted by the 4WD controller 8, and generates power according to the load torque. The magnitude of the power generated by the generator 7 is determined by the magnitude of the generator speed and the field current. The generator speed of the generator 7 can be calculated from the engine speed of the engine 2 based on the pulley ratio.

The electric power generated by the generator 7 can be supplied to the motor 4 via the junction box 10 and the inverter 9. The drive shaft of the motor 4 can be connected to the rear wheels 3L and 3R via the speed reducer 11 and the clutch 12. In addition, the motor 4 of this embodiment is an AC motor. Moreover, the code | symbol 13 in a figure shows a difference gear.
In the junction box 10, a relay for connecting and disconnecting the inverter 9 and the generator 7 is provided. Then, the DC power supplied from the generator 7 through a rectifier (not shown) with this relay connected is converted into a three-phase AC in the inverter 9 to drive the motor 4.

Each wheel 1L, 1R, 3L, 3R is provided with a wheel speed sensor 15FL, 15FR, 15RL, 15RR. Each wheel speed sensor 15FL, 15FR, 15RL, 15RR outputs a pulse signal corresponding to the rotational speed of the corresponding wheel 1L, 1R, 3L, 3R to the 4WD controller 8 as a wheel speed detection value.
The 4WD controller 8 inputs detection signals detected by various sensors, and performs drive control of the generator 7, engagement / disengagement control of the clutch 12, relay control in the junction box 10, and the like.

FIG. 2 is a diagram illustrating a configuration of a cooling device for cooling the inverter 9.
As shown in FIG. 2, the cooling device includes a water pump 21, a sub radiator 22, a control device 23, and cooling water channels 24 a to 24 d.
The water pump 21 circulates cooling water (cooling fluid) for cooling the inverter 9. The cooling water discharged from the water pump 21 flows through the cooling water passage 24a, is supplied to the inverter 9, and flows through the cooling water passage 24b to absorb heat generated by the inverter 9. The cooling water that has absorbed the heat of the inverter 9 flows from the inverter 9 through the cooling water passage 24c and is supplied to the sub-radiator 22 where the heat of the cooling water is released. The cooling water from which heat has been released by the sub-radiator 22 flows through the cooling water passage 24d and is supplied to the water pump 21 again.

Thus, the inverter 9 is cooled while circulating the cooling water.
In addition, this cooling device is installed in the cooling water passage 24b and the INV temperature sensor 25 for detecting the temperature (INV temperature) T1 of the inverter IGBT element, and detects the temperature (cooling water temperature) T2 of the cooling water supplied to the inverter 9. A water temperature sensor 26.
The control device 23 inputs the INV temperature T1 detected by the INV temperature sensor 25 and the cooling water temperature T2 detected by the water temperature sensor 26. And the control apparatus 23 performs the abnormality diagnosis of a cooling system by performing the comparative diagnosis of INV temperature T1 and the cooling water temperature T2. In addition, the control device 23 outputs a drive command value for driving the water pump 21 to the water pump 21.

Here, the case where the inverter 9 is cooled using the cooling water has been described. However, a cooling fluid such as cooling oil may be used instead of the cooling water.
FIG. 3 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S1, the control device 23 reads the INV temperature T1 detected by the INV temperature sensor 25 and the cooling water temperature T2 detected by the water temperature sensor 26, and proceeds to step S2.
In step S2, the control device 23 calculates a water temperature deviation ΔT which is a temperature difference between the INV temperature T1 read in step S1 and the cooling water temperature T2. Here, ΔT = T1−T2.

Next, in step S3, the control device 23 determines whether or not the water temperature deviation ΔT calculated in step S2 is smaller than a predetermined value T _TH1 . When it is determined that ΔT <T _TH1 , the process _proceeds to step S4, where it is determined that an abnormality of the cooling system (cooling water circulation failure) has occurred, and a predetermined fail-safe process is executed. The cooling abnormality diagnosis process is terminated. On the other hand, when it is determined that ΔT ≧ T _TH1 , the process _proceeds to step S5, where it is determined that no abnormality in the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

<Operation>
Next, the operation of the first embodiment will be described.
It is assumed that there is no abnormality in the cooling device and the cooling water is circulated normally. In this case, the cooling water discharged from the water pump 21 is supplied to the inverter 9 where the heat of the inverter 9 is absorbed. The cooling water that has absorbed the heat is supplied to the sub-radiator 22 where the heat of the cooling water is released. Then, the cooled cooling water is supplied to the water pump 21 again.
At this time, the control device 23 executes a cooling abnormality diagnosis process shown in FIG. Then, the cooling water temperature T2 is subtracted from the INV temperature T1 read in step S1, and a water temperature deviation ΔT is calculated in step S2.

When the cooling water circulates normally, the cooled water is supplied into the inverter 9 one after another. Therefore, the temperature rise of the cooling water temperature T2 is suppressed, and a temperature difference is generated between the INV temperature T1 and the cooling water temperature T2. Therefore, the control device 23 determines in step S3 that the water temperature deviation ΔT is equal to or greater than the predetermined value T _TH1 , and proceeds to step S5 to determine that the cooling system is normal.
If the circulation failure of the cooling water occurs from this state, the amount of the cooling water in the inverter 9 replaced is reduced compared to the normal time. For this reason, the cooling water temperature T2 gradually rises due to the heat generated by the inverter 9, and the difference between the INV temperature T1 and the cooling water temperature T2 becomes smaller than that in the normal state.

Therefore, in this case, the control device 23 determines that the water temperature deviation ΔT is smaller than the predetermined value T _{TH1 in} step S3 of FIG. 3, and moves to step S4 to determine that an abnormality has occurred in the cooling system. .
By the way, in the general cooling device shown in FIG. 4, when the water temperature sensor 126 is attached to the cooling water supply port to the inverter 109 and the cooling water overheat is detected by the water temperature sensor 126, an abnormality has occurred in the cooling system. Judge.

However, when the cooling water circulation failure occurs, the water temperature in the inverter 109 main body continues to rise due to the heat generation of the IGBT element and the stop of the inflow of the cooled water, but the water temperature detected by the water temperature sensor 126 is in the inverter 109 main body. It will be much lower than the water temperature. This is because although the water temperature detected by the water temperature sensor 126 rises due to heat propagation from the main body of the inverter 109, the rising speed is obviously slow.
Therefore, when the water temperature sensor 126 detects the cooling water overheating, the inverter 109 main body has been overheated much larger than when the cooling system is normal, and there is a possibility that the inverter 109 has already been damaged.

On the other hand, in this embodiment, a comparative diagnosis between the INV temperature T1 and the cooling water temperature T2 is performed. When these two temperature deviations ΔT become extremely smaller than the normal value, it is determined that an abnormality has occurred in the cooling system. Thereby, the abnormality of the cooling system can be reliably detected before the engine 2 and the inverter 9 main body are damaged, and fail-safe processing can be performed.
In FIG. 2, the INV temperature sensor 25 constitutes inverter temperature detection means, and the water temperature sensor 26 constitutes fluid temperature detection means. Further, steps S2 and S3 in FIG. 3 constitute a circulation failure judging means.

"effect"
(1) The inverter temperature detection means detects the element temperature of the inverter. The fluid temperature detecting means detects the temperature of the cooling fluid in the cooling fluid path. The circulation failure determining means determines whether or not a cooling fluid circulation failure has occurred based on the temperature difference between the inverter temperature detected by the inverter temperature detection means and the fluid temperature detected by the fluid temperature detection means.
Thereby, it can be detected that the difference between the inverter temperature and the fluid temperature is abnormally large or small as compared with the case where the cooling water is normally circulated. Based on this, it is possible to reliably detect the circulation failure of the cooling water. As a result, fail-safe processing can be performed before the engine or the inverter body is damaged.
In addition, among the cooling system abnormalities, it is possible to distinguish between a water pump main unit failure for which a diagnosis method has been established and a failure mode for cooling water circulation stop, so that it is possible to easily deal with services.

(2) The fluid temperature detecting means detects the fluid temperature in the cooling fluid path provided in the inverter. The poor circulation determining means determines that a defective cooling fluid circulation has occurred when a temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detecting means from the inverter temperature detected by the inverter temperature detecting means is smaller than a predetermined value. .
When normal, the cooling water in the inverter changes one after another, and the temperature difference increases. When an abnormality occurs, the cooling water flows into the inverter and the temperature difference decreases. In this way, it is possible to reliably detect the circulation failure of the cooling water by utilizing the difference in temperature between the normal time and the abnormal time.
Moreover, since it comprises so that the temperature of the cooling water in the cooling water path provided in the inverter may be detected by the water temperature sensor, a circuit for the water temperature sensor can be provided in the inverter. As a result, it is not necessary to separately provide a circuit as in the case where the circuit is provided in another cooling water channel, and the configuration of the cooling abnormality detection device can be simplified.

<< Second Embodiment >>
In the second embodiment, the water temperature in the cooling water passage 24b provided in the inverter 9 is detected by the water temperature sensor 26 in the first embodiment described above, whereas the water temperature at the discharge port of the water pump 21 is changed. It is intended to be detected.
"Constitution"
FIG. 5 is a diagram illustrating a configuration of the cooling device according to the second embodiment.
This cooling device has the same configuration as that of FIG. 2 except that the installation position of the water temperature sensor is different from the cooling device shown in FIG. Therefore, here, the description will focus on the different parts.
The water temperature sensor 27 detects the cooling water temperature T3 at the connecting portion between the discharge port of the water pump 21 and the cooling water passage 24a.

FIG. 6 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S11, the control device 23 reads the INV temperature T1 detected by the INV temperature sensor 25 and the cooling water temperature T3 detected by the water temperature sensor 27, and proceeds to step S12.
In step S12, the control device 23 calculates a water temperature deviation ΔT which is a temperature difference between the INV temperature T1 read in step S11 and the cooling water temperature T3. Here, ΔT = T1−T3.

Next, in step S13, the controller 23 determines whether or not the water temperature deviation ΔT calculated in step S12 is greater than a predetermined value T _TH2 . When it is determined that ΔT> T _TH2 , the process _proceeds to step S14, where it is determined that an abnormality in the cooling system has occurred, a predetermined fail-safe process is performed, and the cooling abnormality diagnosis process is terminated. . On the other hand, when it is determined that ΔT ≦ T _TH2 , the process proceeds to step S15, where it is determined that no abnormality in the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

<Operation>
Next, the operation of the second embodiment will be described.
It is assumed that there is no abnormality in the cooling device and the cooling water is circulated normally. At this time, the control device 23 executes a cooling abnormality diagnosis process shown in FIG. Then, the cooling water temperature T3 is subtracted from the INV temperature T1 read in step S11, and the water temperature deviation ΔT is calculated in step S12.
When the cooling water is normally circulated, the cooling water discharged from the water pump 21 is the one that has cooled the inverter 9 and returned, so that the temperature of the cooling water increases as the temperature of the inverter 9 increases. To do. Therefore, a large temperature difference does not occur between the INV temperature T1 and the cooling water temperature T3. Therefore, the control device 23 determines in step S13 that the water temperature deviation ΔT is equal to or less than the predetermined value T _TH2 , moves to step S15, and determines that the cooling system is normal.

If the circulation failure of the cooling water occurs from this state, the amount of the cooling water in the inverter 9 replaced is reduced compared to the normal time. For this reason, the amount of cooling water heated by the inverter 9 returning to the water pump 21 is reduced as compared with the normal time, and the cooling water temperature T3 is lowered accordingly. On the other hand, the temperature T1 of the IGBT element rises due to the stoppage of the cooling water flow. As a result, the difference between the INV temperature T1 and the cooling water temperature T3 becomes larger than that in the normal state.
Therefore, in this case, the control device 23 determines that the water temperature deviation ΔT is larger than the predetermined value T _{TH2 in} step S13 of FIG. 6, and shifts to step S14 to determine that an abnormality has occurred in the cooling system. .

Thus, in this embodiment, the water temperature sensor 26 detects the water temperature T3 near the discharge port of the water pump 21. Then, a comparative diagnosis between the INV temperature T1 and the detected cooling water temperature T3 is performed. When these two temperature deviations ΔT are extremely larger than normal values, it is determined that an abnormality has occurred in the cooling system. Thereby, the abnormality of the cooling system can be reliably detected before the engine 2 or the inverter 9 main body is damaged.
In FIG. 5, the INV temperature sensor 25 constitutes inverter temperature detection means, and the water temperature sensor 27 constitutes fluid temperature detection means. Further, steps S12 and S13 in FIG. 6 constitute a circulation failure determination means.

"effect"
(1) The fluid temperature detecting means detects the fluid temperature in the cooling fluid path provided in the cooling fluid pump. The circulation failure determination means determines that a circulation failure of the cooling fluid has occurred when a temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detection means from the inverter temperature detected by the inverter temperature detection means is greater than a predetermined value. .
When normal, the cooling water discharged from the inverter returns to the water pump one after another, and the temperature difference becomes smaller.When an abnormality occurs, the cooling water returning from the inverter to the water pump decreases and the temperature difference becomes smaller. growing. In this way, it is possible to reliably detect the circulation failure of the cooling water by utilizing the difference in temperature between the normal time and the abnormal time.
In addition, when an abnormality occurs, the water temperature in the vicinity of the water temperature sensor does not increase at all even if the inverter temperature increases, so that it is possible to easily and stably detect the cooling water circulation failure.

<Modification>
(1) In the second embodiment, the case where the water temperature sensor 27 detects the cooling water temperature of the connecting portion between the discharge port of the water pump 21 and the cooling water passage 24a has been described. Instead, the water pump 21 The cooling water temperature at the connecting portion between the supply port and the cooling water channel 24d may be detected. Also in this case, the temperature difference between the INV temperature and the cooling water temperature can be reduced when normal, and the temperature difference can be increased when an abnormality occurs. Therefore, it is possible to reliably detect the circulation failure of the cooling water by utilizing the difference in the temperature between the normal time and the abnormal time.

<< Third Embodiment >>
In the third embodiment, a heat recovery device is provided in the cooling water channel 24c, and a water temperature sensor included in the heat recovery device detects the water temperature in the cooling water channel.
"Constitution"
FIG. 7 is a diagram illustrating a configuration of a cooling device according to the third embodiment.
This cooling device has the same configuration as that of FIG. 2 except that in the cooling device shown in FIG. 2, the heat recovery device 28 is interposed in the cooling water passage 24c and the water temperature sensor 26 is omitted. Therefore, here, the description will focus on the different parts.
The heat recovery device 28 recovers the heat of the cooling water that has absorbed the heat generated by the inverter 9, and includes a water temperature sensor 28a for controlling the heat recovery. The water temperature sensor 28a detects the water temperature T4 supplied to the heat recovery device 28 and before the heat is recovered.

FIG. 8 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S21, the control device 23 reads the INV temperature T1 detected by the INV temperature sensor 25 and the cooling water temperature T4 detected by the water temperature sensor 28a, and proceeds to step S22.
In step S22, the control device 23 calculates a water temperature deviation ΔT which is a temperature difference between the INV temperature T1 read in step S21 and the cooling water temperature T4. Here, ΔT = T1−T4.

Next, in step S23, the controller 23 determines whether or not the water temperature deviation ΔT calculated in step S22 is greater than a predetermined value T _TH3 . When it is determined that ΔT> T _TH3 , the process _proceeds to step S24, where it is determined that an abnormality in the cooling system has occurred, a predetermined fail-safe process is performed, and the cooling abnormality diagnosis process is terminated. . On the other hand, when it is determined that ΔT ≦ T _TH3 , the process _proceeds to step S25, where it is determined that no abnormality in the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

<Operation>
Next, the operation of the third embodiment will be described.
It is assumed that there is no abnormality in the cooling device and the cooling water is circulated normally. At this time, the control device 23 executes a cooling abnormality diagnosis process shown in FIG. Then, the cooling water temperature T4 is subtracted from the INV temperature T1 read in step S21, and the water temperature deviation ΔT is calculated in step S22.
When the cooling water circulates normally, the cooling water supplied to the heat recovery device 28 absorbs the heat of the inverter 9, so that the temperature of the cooling water rises as the temperature of the inverter 9 rises. . Therefore, a large temperature difference does not occur between the INV temperature T1 and the cooling water temperature T4. Therefore, the control device 23 determines in step S23 that the water temperature deviation ΔT is equal to or less than the predetermined value T _TH3 , moves to step S25, and determines that the cooling system is normal.

If the circulation failure of the cooling water occurs from this state, the amount of the cooling water in the inverter 9 replaced is reduced compared to the normal time. For this reason, compared with the time of normal, the quantity by which the cooling water heated by the inverter 9 is supplied to the heat recovery device 28 is reduced, and the cooling water temperature T4 is lowered accordingly. On the other hand, the temperature T1 of the IGBT element rises due to the stoppage of the cooling water flow. As a result, the difference between the INV temperature T1 and the cooling water temperature T4 becomes larger than that in the normal state.
Therefore, in this case, the control device 23 determines that the water temperature deviation ΔT is larger than the predetermined value T _{TH3 in} step S23 of FIG. 8, and shifts to step S24 to determine that an abnormality has occurred in the cooling system. .

Thus, in the present embodiment, the water temperature sensor 28a detects the water temperature T4 after cooling the inverter 9 and before the heat recovery device 28 recovers heat. Then, a comparative diagnosis between the INV temperature T1 and the detected cooling water temperature T4 is performed. When these two temperature deviations ΔT are extremely larger than normal values, it is determined that an abnormality has occurred in the cooling system. Thereby, the abnormality of the cooling system can be reliably detected before the engine 2 or the inverter 9 main body is damaged.
In FIG. 7, the INV temperature sensor 25 constitutes inverter temperature detection means, the heat recovery device 28 constitutes heat recovery means, and the water temperature sensor 28a constitutes fluid temperature detection means. Further, steps S22 and S23 in FIG. 8 constitute a circulation failure determination means.

"effect"
(1) Provided with a heat recovery means that is interposed in the cooling fluid path and recovers the heat of the inverter absorbed by the cooling fluid. The fluid temperature detection means is provided in the heat recovery means and detects the fluid temperature before heat is recovered by the heat recovery means. The circulation failure determination means determines that a circulation failure of the cooling fluid has occurred when a temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detection means from the inverter temperature detected by the inverter temperature detection means is greater than a predetermined value. .
Thereby, like the second embodiment described above, it is possible to reliably detect the circulation failure of the cooling water.
Further, since the temperature of the cooling water is detected using the water temperature sensor of the heat recovery device, there is no need to newly provide a water temperature sensor in another cooling water channel.

<< Fourth Embodiment >>
In the fourth embodiment, in the first to third embodiments described above, the comparative diagnosis is performed using the INV temperature and the water temperature in the cooling water channel, whereas two water temperature sensors are provided in the cooling water channel. A comparative diagnosis is made using two detected water temperatures.
"Constitution"
FIG. 9 is a diagram illustrating a configuration of a cooling device according to the fourth embodiment.
This cooling device has the same configuration as that of FIG. 2 except that the water temperature sensor 27 is provided and the INV temperature sensor 25 is omitted from the cooling device shown in FIG. Therefore, here, the description will focus on the different parts.
The water temperature sensor 26 detects the temperature T2 of the cooling water supplied to the inverter 9 in the cooling water channel 24b.
The water temperature sensor 27 detects the temperature of the cooling water discharged from the water pump 21 (the temperature of the cooling water before being supplied to the inverter 9) T3 in the cooling water channel 24a.

FIG. 10 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S31, the control device 23 reads the cooling water temperature T2 detected by the water temperature sensor 26 and the cooling water temperature T3 detected by the water temperature sensor 27, and proceeds to step S32.
In step S32, the control device 23 calculates a water temperature deviation ΔT that is a temperature difference between the cooling water temperature T2 and the cooling water temperature T3 read in step S31. Here, ΔT = T2−T3.

Next, in step S33, the controller 23 determines whether or not the water temperature deviation ΔT calculated in step S32 is greater than a predetermined value T _TH4 . When it is determined that ΔT> T _TH4 , the process _proceeds to step S34, where it is determined that an abnormality in the cooling system has occurred, a predetermined fail-safe process is performed, and the cooling abnormality diagnosis process is terminated. . On the other hand, when it is determined that ΔT ≦ T _TH4 , the process proceeds to step S35, where it is determined that no abnormality in the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

<Operation>
Next, the operation of the fourth embodiment will be described.
It is assumed that there is no abnormality in the cooling device and the cooling water is circulated normally. At this time, the control device 23 executes a cooling abnormality diagnosis process shown in FIG. Then, the coolant temperature T3 is subtracted from the coolant temperature T2 read in step S31, and a coolant temperature deviation ΔT is calculated in step S32.
When the cooling water is normally circulated, the cooling water is supplied to the inverter 9 one after another, so that the temperature of the cooling water in the inverter 9 is suppressed. That is, the temperature rise of the cooling water temperature T2 is suppressed. In addition, since the cooling water before being supplied to the inverter 9 is obtained by circulating the cooling water after cooling the inverter 9, the temperature of the cooling water increases according to the temperature of the inverter 9. That is, the temperature of the cooling water temperature T3 increases according to the temperature of the inverter 9. Therefore, a large temperature difference does not occur between the cooling water temperature T2 and the cooling water temperature T3.

Therefore, the control device 23 determines in step S33 that the water temperature deviation ΔT is equal to or less than the predetermined value T _TH4 , moves to step S35, and determines that the cooling system is normal.
If the circulation failure of the cooling water occurs from this state, the amount of the cooling water in the inverter 9 replaced is reduced compared to the normal time. Therefore, the temperature rise of the cooling water in the inverter 9 (temperature rise of the cooling water temperature T2) is larger than that in the normal state. Further, since the amount of cooling water heated by the inverter 9 returns to the water pump 21 is reduced as compared with the normal time, the temperature of the cooling water (cooling water temperature T3) is lowered accordingly. That is, the temperature difference between the cooling water temperature T2 and the cooling water temperature T3 increases.

Therefore, in this case, the control device 23 determines that the water temperature deviation ΔT is larger than the predetermined value T _{TH4 in} step S33 of FIG. 10, and shifts to step S34 to determine that an abnormality has occurred in the cooling system. .
Thus, in this embodiment, compared with the normal time, the temperature T2 of the cooling water in the inverter that increases in temperature when an abnormality occurs and the temperature T3 of the cooling water before being supplied to the inverter 9 that decreases in temperature are compared. Make a diagnosis. When these two temperature deviations ΔT are extremely larger than the normal values, it is determined that an abnormality has occurred in the cooling system. Thereby, the abnormality of the cooling system can be reliably detected before the engine 2 or the inverter 9 main body is damaged.
In FIG. 9, the water temperature sensor 26 constitutes a first fluid temperature detecting means, and the water temperature sensor 27 constitutes a second fluid temperature detecting means. Further, steps S32 and S33 in FIG. 10 constitute a circulation failure judging means.

"effect"
(1) The first fluid temperature detecting means detects the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter. The second fluid temperature detecting means detects the temperature of the cooling fluid before being supplied to the cooling fluid path provided in the inverter. The circulatory failure judging means cools when the temperature difference obtained by subtracting the second fluid temperature detected by the second fluid temperature detecting means from the first fluid temperature detected by the first fluid temperature detecting means is larger than a predetermined value. Judge that fluid circulation failure has occurred.
Thereby, it is possible to reliably detect the circulation failure of the cooling water by utilizing the difference in the temperature between the normal time and the abnormality occurrence.

<Modification>
(1) In the fourth embodiment, the case where the water temperature sensor 27 detects the water temperature before being discharged from the water pump 21 and supplied to the inverter 9 has been described. Instead, the inverter 9 It is also possible to detect the water temperature before the heat is discharged and the heat is released. Also in this case, the detected coolant temperature becomes higher in accordance with the temperature rise of the inverter 9 when it is normal, and becomes low when an abnormality occurs. Therefore, it is possible to reliably detect poor circulation of the cooling water.
Further, when the heat recovery device 28 as shown in FIG. 7 is provided, the water temperature sensor 28a of the heat recovery device 28 can detect the water temperature before being discharged from the inverter 9 and before the heat is released. . In this case, since the water temperature sensor 28a of the heat recovery device 28 can be used, it is not necessary to newly provide a water temperature sensor in another cooling water channel.

<< Fifth Embodiment >>
In the fifth embodiment, in the first to fourth embodiments described above, two detection means are provided, and the value detected by each is compared and diagnosed, whereas only one water temperature sensor is provided, A comparative diagnosis is performed using two detection values detected at different timings.
"Constitution"
FIG. 11 is a diagram illustrating a configuration of a cooling device according to the fifth embodiment.
This cooling device has the same configuration as that of FIG. 9 except that the water temperature sensor 27 is omitted from the cooling device shown in FIG. Therefore, here, the description will focus on the different parts.
The water temperature sensor 26 detects a cooling water temperature T2 before the water pump 21 is driven and a cooling water temperature T2 for a predetermined period after the water pump 21 is driven.

FIG. 12 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S41, the control device 23 reads the cooling water temperature T2 detected by the water temperature sensor 26, and proceeds to step S42.
In step S42, the control device 23 calculates Ready-ON elapsed time (driving time of the water pump 21) Time, and proceeds to step S43.

  In step S43, the control device 23 determines whether or not the Ready-ON elapsed time Time is 0 second. When it is determined that Time = 0, it is determined that the water pump 21 has not yet started driving, and the process proceeds to step S44. In step S44, the control device 23 sets the cooling water temperature T2 read in step S41 as an initial water temperature (cooling water temperature before the water pump 21 is driven) T2 ′, and then ends the cooling abnormality diagnosis process.

On the other hand, when the control device 23 determines in Step S43 that Time> 0, the process proceeds to Step S45, and whether or not a predetermined time has elapsed after the water pump 21 is driven (Ready-ON elapsed time Time is For example, whether or not 20 seconds has been reached). When it is determined that Time> 20, the cooling abnormality diagnosis process is terminated as it is, and when it is determined that Time ≦ 20, the process proceeds to step S46.
In step S46, the control device 23 calculates a water temperature deviation ΔT which is a temperature difference between the latest cooling water temperature T2 read in step S1 and the initial water temperature T2 ′ set in step S44. Here, ΔT = T2′−T2.

Next, in step S47, the control device 23 determines whether or not the water temperature deviation ΔT calculated in step S44 is smaller than “0”. When it is determined that ΔT <0, after the water pump 21 is driven, it is determined that the cooling water temperature T2 has become higher than the initial water temperature T2 ′, and the process proceeds to step S48. In step S48, it is determined that a cooling system abnormality has occurred, a predetermined fail-safe process is executed, and the cooling abnormality diagnosis process is terminated.
On the other hand, when it is determined in step S47 that ΔT ≧ 0, the process proceeds to step S49, where it is determined that no abnormality of the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

<Operation>
Next, the operation of the fifth embodiment will be described with reference to FIG.
When the vehicle is left after running, the water pump 21 stops driving and the circulation of the cooling water is also stopped. At this time, the cooling water in the sub-radiator 22 is cooled quickly, but the cooling water in the inverter 9 main body takes time to cool, so that a large distribution occurs in the cooling water temperature in the cooling water channels 24a to 24d.
When the vehicle is restarted in this state, the control device 23 executes a cooling abnormality diagnosis process shown in FIG. At this time, since Time = 0 before the water pump 21 is driven, Yes is determined in step S43, the process proceeds to step S44, and the detected value (T _{0 in} FIG. 13) of the water temperature sensor 26 read in step S41 is initialized. Set as water temperature T2 '.

  After that, when the water pump 21 is driven (WP-ON in FIG. 13), Time> 0, so the control device 23 determines No in step S43 and proceeds to step S45. At this time, immediately after the water pump 21 is driven and Time <20, it is determined No in step S45, and the process proceeds to step S46. In step S46, the water temperature deviation ΔT is calculated by subtracting the cooling water temperature T2 after driving the water pump 21 from the initial water temperature T2 ′ before driving the water pump 21.

When the cooling water is normally circulated by driving the water pump 21, the cooling water cooled by the sub-radiator 22 is supplied to the inverter 9 one after another. Thereby, the temperature in the cooling water channels 24a to 24d is made uniform, and the water temperature in the inverter 9 is lower than that before the water pump 21 is driven. That is, as shown in FIG. 13A, the water temperature T2 detected by the water temperature sensor 26 immediately after the water pump 21 is driven is lower than the detected water temperature T ₀ before the water pump 21 is driven.
Therefore, the control device 23 determines in step S47 that the water temperature deviation ΔT ≧ 0, and proceeds to step S49 to determine that the cooling system is normal.

On the other hand, when the circulation failure of the cooling water occurs, the temperature in the cooling water channels 24a to 24d is not uniformized. Therefore, as shown in FIG. 13B, the water temperature T2 detected by the water temperature sensor 26 immediately after the water pump 21 is driven does not become lower than the detected water temperature T ₀ before the water pump 21 is driven, and starts to rise. Therefore, in this case, the control device 23 determines in step S47 that the water temperature deviation ΔT <0, and shifts to step S48 to determine that an abnormality has occurred in the cooling system.
Thus, in this embodiment, the water temperature change in the inverter 9 before and after the water pump 21 is driven is monitored. Thereby, the poor circulation of cooling water can be detected reliably.
In FIG. 11, the water temperature sensor 26 constitutes a fluid temperature detecting means. Further, steps S46 and S47 in FIG. 12 constitute a circulation failure determination means.

"effect"
(1) The fluid temperature detecting means detects the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter. The circulatory failure determination means determines the second fluid temperature detected by the fluid temperature detection means after the cooling fluid pressure pump is driven from the first fluid temperature detected by the fluid temperature detection means before the cooling fluid pressure pump is driven. When the subtracted temperature difference is a negative value, it is determined that a cooling fluid circulation failure has occurred.
Thereby, the poor circulation of cooling water can be detected reliably. This is particularly effective during factory shipment inspections where the soak time is halfway.

<< Sixth Embodiment >>
In the sixth embodiment, in the fifth embodiment described above, an abnormality is detected by monitoring a water temperature change immediately after the vehicle is started, while an abnormality is detected by monitoring an increase in the water temperature while the vehicle is running. It is what you do.
"Constitution"
FIG. 14 is a diagram illustrating a configuration of a cooling device according to the sixth embodiment.
This cooling device has the same configuration as that of FIG. 11 except that the current sensor 29 is added to the cooling device shown in FIG. Therefore, here, the description will focus on the different parts.
The current sensor 29 detects a drive current (INV current) I of the inverter 9. Further, the water temperature sensor 26 detects a water temperature T2 in the inverter 9 while the vehicle is traveling.

FIG. 15 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S51, the control device 23 reads the INV current I detected by the current sensor 29, and proceeds to step S52.
In step S52, the control device 23 determines whether or not the INV current I read in step S51 is smaller than a predetermined value _ITH . When it is determined that I <I _TH , the process proceeds to step S53, and when it is determined that I ≧ I _TH , the cooling abnormality diagnosis process is ended as it is.

In step S53, the control device 23 reads the cooling water temperature T2 detected by the water temperature sensor 26, and proceeds to step S54.
In step S54, the control device 23 determines whether or not the cooling water temperature T2 read in step S53 exceeds a predetermined temperature α (for example, 50 ° C.). Here, the predetermined temperature α is set according to the amount of heat generated by the inverter when the INV current I becomes the predetermined current I ₀ (<I _TH ), and is set in consideration of the cooling efficiency of the cooling device. To do.

When it is determined that T2 ≦ α, the cooling abnormality diagnosis process is terminated as it is. When it is determined that T2> α, it is determined that the cooling abnormality diagnosis is started, and the process proceeds to step S55.
In step S55, the control device 23 determines whether or not the cooling water temperature T2 read in step S53 exceeds a predetermined temperature β (for example, 80 ° C.). When it is determined that T2> β, it is determined that the engine is overheated, the process proceeds to step S56, it is determined that an abnormality has occurred in the cooling system, and a predetermined failsafe process is executed. The cooling abnormality diagnosis process is terminated.

On the other hand, when the control device 23 determines in step S55 that T2 ≦ β, the process proceeds to step S57, and the temperature increase rate ΔT of the cooling temperature T2 per predetermined time (for example, 30 sec) is calculated.
Next, the process proceeds to step S58, and it is determined whether or not the temperature increase rate ΔT calculated in step S57 is greater than a predetermined value T _TH5 . When it is determined that ΔT> T _TH5 , the _{process proceeds} to step S59, where it is determined that there is a possibility that a cooling system abnormality has occurred, and the cooling abnormality diagnosis process is terminated (temporary abnormality determination).
On the other hand, when it is determined in step S58 that ΔT <T _TH5 , the _{process proceeds} to step S60, where it is determined that no abnormality in the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

<Operation>
Next, the operation of the sixth embodiment will be described with reference to FIG.
Now, it is assumed that no abnormality has occurred in the cooling device while the vehicle is running, and the cooling water is normally circulated. At this time, the control device 23 executes a cooling abnormality diagnosis process shown in FIG. When the INV current I read in step S51 is within a predetermined range (I <I _TH ), it is determined whether or not the water temperature rise is large despite the INV current I being sufficiently small. The process proceeds from step S52 to step S53.

When the cooling water is circulating normally, the cooling water is supplied into the inverter 9 one after another. Therefore, the temperature rise of the cooling water temperature T2 detected by the water temperature sensor 26 is suppressed.
Therefore, when the cooling water temperature T2 exceeds the predetermined temperature α at time t1 in FIG. 16A, the control device 23 determines Yes in step S54 and proceeds to step S55. At this time, since the coolant temperature T2 is equal to or lower than the predetermined temperature β, it is determined No in step S55, and the temperature increase rate ΔT is calculated in step S57.

As described above, since the temperature rise of the cooling water temperature T2 is suppressed during normal operation, the control device 23 determines that the temperature increase rate ΔT is equal to or less than the predetermined value T _TH5 in step S58, and _proceeds to step S60 for cooling. The system is determined to be normal (time t2).
Thereafter, when the INV current I reaches the predetermined value I _TH at time t3, the control device 23 determines No in step S52 and ends the cooling abnormality diagnosis process.

On the other hand, when the circulation failure of the cooling water occurs, the amount of the cooling water in the inverter 9 replaced is reduced compared to the normal time. For this reason, compared with the time of normal, the cooling water temperature T2 rises rapidly with the rise in inverter temperature.
Therefore, in this case, when the cooling water temperature T2 exceeds the predetermined temperature α at time t11 in FIG. 16B and the temperature increase rate ΔT is calculated in step S57, the temperature increase rate ΔT becomes greater than the predetermined value T _TH5. . Therefore, it determines with Yes by step S58, transfers to step S59, and determines that abnormality (temporary abnormality) has generate | occur | produced in the cooling system (time t12).

Thereafter, when the cooling water temperature T2 exceeds the predetermined temperature β at time t13, the control device 23 determines Yes in step S55, proceeds to step S56, and determines that an abnormality has occurred in the cooling system.
The INV current I is directly connected to the amount of heat generated by the inverter 9. When the cooling water circulation failure occurs, the cooling water in the inverter 9 is heated and the INV temperature T1 rises rapidly, but the water temperature T2 in the vicinity of the water temperature sensor 26 rises due to heat propagation from the center of the inverter and changes in temperature. Is slow.

By utilizing these characteristics, in the present embodiment, a cooling system abnormality is detected by detecting a state in which the rate of increase in the cooling water temperature T2 per predetermined time is large in a traveling scene in which the INV current I is within a predetermined range. To detect. Thereby, the abnormality of the cooling system can be reliably detected before the engine 2 and the inverter 9 main body are damaged, and fail-safe processing can be performed.
In FIG. 14, the water temperature sensor 26 constitutes a fluid temperature detecting means. Further, steps S58 and S59 in FIG. 15 constitute a circulation failure determination means.

"effect"
(1) The fluid temperature detecting means detects the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter. The poor circulation determining means determines that a defective circulation of the cooling fluid has occurred when the rate of increase in the fluid temperature detected by the fluid temperature detecting means during traveling of the vehicle is greater than a predetermined value.
Thereby, the poor circulation of cooling water can be detected reliably.

<< Seventh Embodiment >>
In the seventh embodiment, the INV temperature T1 and the cooling water temperature T2 are compared and diagnosed in the first embodiment described above, whereas the estimated water temperature T5 and the cooling water temperature T2 estimated from the INV temperature T1 and the like. Is a comparative diagnosis.
"Constitution"
FIG. 17 is a diagram illustrating a configuration of a cooling device according to the seventh embodiment.
This cooling device has the same configuration as that of FIG. 2 except that the current sensor 29 is added to the cooling device shown in FIG. Therefore, here, the description will focus on the different parts.
The current sensor 29 detects a drive current (INV current) I of the inverter 9.

FIG. 18 is a flowchart showing a cooling abnormality diagnosis processing procedure executed by the control device 23.
First, in step S61, the control device 23 reads the INV temperature T1 detected by the INV temperature sensor 25 and the INV current I detected by the current sensor 29, and proceeds to step S62.
In step S62, the control device 23 calculates the water temperature rise based on constants obtained from experimental values such as the temperature change of the INV temperature T1, the INV current I and the cooling efficiency of the cooling device, and calculates the cooling water temperature (estimated water temperature) T5. Calculate. The estimated water temperature T5 is a temperature estimated value of the cooling water supplied to the inverter 9.

Next, in step S63, the control device 23 reads the cooling water temperature T2 detected by the water temperature sensor 26, and proceeds to step S64.
In step S64, the control device 23 calculates a water temperature deviation ΔT that is a temperature difference between the estimated water temperature T5 calculated in step S62 and the cooling water temperature T2 read in step S63. Here, ΔT = T5−T2.

Next, in step S65, the controller 23 determines whether or not the water temperature deviation ΔT calculated in step S64 is smaller than a predetermined value _TTH6 . When it is determined that ΔT <T _TH6 , the process _proceeds to step S66, where it is determined that an abnormality in the cooling system has occurred, a predetermined fail-safe process is executed, and the cooling abnormality diagnosis process is terminated. . On the other hand, when it is determined that ΔT ≧ T _TH6 , the process proceeds to step S67, where it is determined that no abnormality in the cooling system has occurred, and the cooling abnormality diagnosis process is terminated.

Thus, in this embodiment, a comparative diagnosis between the estimated water temperature T5 estimated from the INV temperature T1 and the like and the cooling water temperature T2 detected by the water temperature sensor 26 is performed. Then, based on the same concept as in the first embodiment described above, when these two temperature deviations ΔT are extremely smaller than normal values, it is determined that an abnormality has occurred in the cooling system. Thereby, the abnormality of the cooling system can be reliably detected before the engine 2 and the inverter 9 main body are damaged, and fail-safe processing can be performed.
In FIG. 17, the INV temperature sensor 25 constitutes inverter temperature detection means, the water temperature sensor 26 constitutes fluid temperature detection means, and the current sensor 29 constitutes current detection means. Further, step S62 in FIG. 18 constitutes the fluid temperature estimating means, and steps S64 and S65 constitute the circulation failure judging means.

"effect"
(1) The inverter temperature detection means detects the element temperature of the inverter. The current detection means detects an energization current of the inverter. The fluid temperature estimation means estimates the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter based on at least the inverter temperature detected by the inverter temperature detection means and the inverter current detected by the current detection means. The fluid temperature detecting means detects the temperature of the cooling fluid in the cooling fluid path. The poor circulation determination means determines whether or not a defective circulation of the cooling fluid has occurred based on the temperature difference between the fluid temperature estimated by the fluid temperature estimation means and the fluid temperature detected by the fluid temperature detection means.

Thereby, it can be detected that the difference between the estimated temperature value of the cooling fluid supplied to the inverter and the fluid temperature is abnormally large or small compared to the case where the cooling water is normally circulated. Based on this, it is possible to reliably detect the circulation failure of the cooling water. As a result, fail-safe processing can be performed before the engine or the inverter body is damaged.
For example, if the fluid temperature detecting means detects the fluid temperature in the cooling fluid passage provided in the inverter, the temperature difference can be increased when normal, and the temperature difference can be decreased when abnormality occurs. In this way, it is possible to reliably detect the circulation failure of the cooling water by utilizing the difference in temperature between the normal time and the abnormal time.

<Modification>
(1) In the seventh embodiment, the case where the estimated water temperature T5 is compared with the cooling water temperature T2 has been described. However, the estimated water temperature T5 is compared with the cooling water temperature T3 detected by the water temperature sensor 27 shown in FIG. It can also be diagnosed. In this case, an abnormality occurs in the cooling system when the temperature difference (ΔT = T5−T3) between the estimated water temperature T5 and the cooling water temperature T3 is larger than a predetermined value based on the same concept as the second embodiment described above. Judge that
Further, it is possible to make a comparative diagnosis between the estimated water temperature T5 and the cooling water temperature T4 detected by the water temperature sensor 28a shown in FIG. In this case, an abnormality occurs in the cooling system when the temperature difference (ΔT = T5−T4) between the estimated water temperature T5 and the cooling water temperature T4 is larger than a predetermined value based on the same concept as the third embodiment described above. Judge that
Accordingly, it is possible to reliably detect the poor circulation of the cooling water.

It is a schematic block diagram at the time of applying this invention to a four-wheel drive vehicle. It is a figure which shows the structure of the cooling device in 1st Embodiment. 4 is a flowchart illustrating a cooling abnormality diagnosis processing procedure executed by the control device in the first embodiment. It is a figure which shows the structure of a general cooling device. It is a figure which shows the structure of the cooling device in 2nd Embodiment. In 2nd Embodiment, it is a flowchart which shows the cooling abnormality diagnosis process sequence which a control apparatus performs. It is a figure which shows the structure of the cooling device in 3rd Embodiment. In 3rd Embodiment, it is a flowchart which shows the cooling abnormality diagnosis process sequence which a control apparatus performs. It is a figure which shows the structure of the cooling device in 4th Embodiment. In 4th Embodiment, it is a flowchart which shows the cooling abnormality diagnosis processing procedure which a control apparatus performs. It is a figure which shows the structure of the cooling device in 5th Embodiment. In 5th Embodiment, it is a flowchart which shows the cooling abnormality diagnosis process sequence which a control apparatus performs. It is a figure which shows the change of the water temperature sensor detection value at the time of normality and abnormality occurrence. It is a figure which shows the structure of the cooling device in 6th Embodiment. In 6th Embodiment, it is a flowchart which shows the cooling abnormality diagnosis processing procedure which a control apparatus performs. It is a figure which shows the temperature increase rate of the water temperature sensor detection value at the time of normal time and abnormality occurrence. It is a figure which shows the structure of the cooling device in 7th Embodiment. In 7th Embodiment, it is a flowchart which shows the cooling abnormality diagnosis processing procedure which a control apparatus performs.

Explanation of symbols

1L, 1R Front wheel 2 Engine 3L, 3R Rear wheel 4 Motor 7 Generator 8 4WD controller 9 Inverter 21 Water pump 22 Sub radiator 23 Controllers 24a-24d Cooling channel 25 INV temperature sensor 26, 27 Water temperature sensor 28 Heat recovery device 28a Water temperature Sensor 29 Current sensor

Claims (14)

A cooling abnormality detection device for a cooling device comprising: a cooling fluid pump for pumping a cooling fluid; and a cooling fluid path for circulating the cooling fluid pumped from the cooling fluid pump as an object to be cooled.
Inverter temperature detecting means for detecting the element temperature of the inverter;
Fluid temperature detecting means for detecting the temperature of the cooling fluid in the cooling fluid path;
Circulation failure determination means for determining whether or not the cooling fluid circulation failure has occurred based on the temperature difference between the inverter temperature detected by the inverter temperature detection means and the fluid temperature detected by the fluid temperature detection means. and, with a,
The fluid temperature detecting means detects a fluid temperature in a cooling fluid path provided in the inverter;
When the temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detection means from the inverter temperature detected by the inverter temperature detection means is smaller than a predetermined value, the circulation failure judgment means generates a circulation failure of the cooling fluid. A cooling abnormality detection device characterized by determining that the cooling abnormality is present. A cooling abnormality detection device for a cooling device comprising: a cooling fluid pump for pumping a cooling fluid; and a cooling fluid path for circulating the cooling fluid pumped from the cooling fluid pump as an object to be cooled.
Inverter temperature detecting means for detecting the element temperature of the inverter;
Fluid temperature detecting means for detecting the temperature of the cooling fluid in the cooling fluid path;
Circulation failure determination means for determining whether or not the cooling fluid circulation failure has occurred based on the temperature difference between the inverter temperature detected by the inverter temperature detection means and the fluid temperature detected by the fluid temperature detection means. And comprising
The fluid temperature detecting means detects a fluid temperature in a cooling fluid path provided in the cooling fluid pump;
When the temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detection means from the inverter temperature detected by the inverter temperature detection means is larger than a predetermined value, the circulation failure judgment means generates a cooling fluid circulation failure. cold却異atmospheric detector you and determines that there. A cooling abnormality detection device for a cooling device comprising: a cooling fluid pump for pumping a cooling fluid; and a cooling fluid path for circulating the cooling fluid pumped from the cooling fluid pump as an object to be cooled.
Inverter temperature detecting means for detecting the element temperature of the inverter;
Fluid temperature detecting means for detecting the temperature of the cooling fluid in the cooling fluid path;
Circulation failure determination means for determining whether or not the cooling fluid circulation failure has occurred based on the temperature difference between the inverter temperature detected by the inverter temperature detection means and the fluid temperature detected by the fluid temperature detection means. When,
Wherein interposed in the cooling fluid path, and a heat recovery means for recovering the heat of the inverter in which the cooling fluid has absorbed,
The fluid temperature detection means is provided in the heat recovery means, detects the fluid temperature before heat is recovered by the heat recovery means,
When the temperature difference obtained by subtracting the fluid temperature detected by the fluid temperature detection means from the inverter temperature detected by the inverter temperature detection means is larger than a predetermined value, the circulation failure judgment means generates a cooling fluid circulation failure. cold却異atmospheric detector you and determines that there. A cooling abnormality detection device for a cooling device comprising: a cooling fluid pump for pumping a cooling fluid; and a cooling fluid path for circulating the cooling fluid pumped from the cooling fluid pump as an object to be cooled.
First fluid temperature detection means for detecting the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter;
Second fluid temperature detecting means for detecting either the temperature of the cooling fluid before being supplied to the cooling fluid path provided in the inverter or the temperature of the cooling fluid discharged from the cooling fluid path provided in the inverter When,
When the temperature difference obtained by subtracting the second fluid temperature detected by the second fluid temperature detection means from the first fluid temperature detected by the first fluid temperature detection means is larger than a predetermined value, the cooling fluid circulation failure An abnormality in cooling detection device comprising: a circulatory failure determination means for determining that the occurrence of the cooling. A cooling abnormality detection device for a cooling device comprising: a cooling fluid pump for pumping a cooling fluid; and a cooling fluid path for circulating the cooling fluid pumped from the cooling fluid pump as an object to be cooled.
Fluid temperature detection means for detecting the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter;
The temperature obtained by subtracting the second fluid temperature detected by the fluid temperature detecting means after the cooling fluid pressure pump is driven from the first fluid temperature detected by the fluid temperature detecting means before the cooling fluid pressure pump is driven. A cooling failure detection device comprising: a circulation failure determining means for determining that a failure in circulation of the cooling fluid has occurred when the difference is a negative value. A cooling fluid pump that pumps the cooling fluid; a cooling fluid path that circulates the cooling fluid pumped from the cooling fluid pump as an object to be cooled by an inverter that supplies power from a power source to a motor that is a driving source of the vehicle; A cooling abnormality detection device for a cooling device comprising:
Fluid temperature detection means for detecting the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter;
Circulatory failure determination means for determining that the cooling fluid circulation failure has occurred when the rate of increase of the fluid temperature detected by the fluid temperature detection device during traveling of the vehicle is greater than a predetermined value. Cooling abnormality detection device. A cooling abnormality detection device for a cooling device comprising: a cooling fluid pump for pumping a cooling fluid; and a cooling fluid path for circulating the cooling fluid pumped from the cooling fluid pump as an object to be cooled.
Inverter temperature detecting means for detecting the element temperature of the inverter;
Current detecting means for detecting an energization current of the inverter;
Fluid temperature estimation means for estimating the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter based on at least the inverter temperature detected by the inverter temperature detection means and the inverter current detected by the current detection means When,
Fluid temperature detecting means for detecting the temperature of the cooling fluid in the cooling fluid path;
Defective circulation determining means for determining whether or not a defective circulation of the cooling fluid has occurred based on a temperature difference between the fluid temperature estimated by the fluid temperature estimating means and the fluid temperature detected by the fluid temperature detecting means. And a cooling abnormality detection device.   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting an element temperature of the inverter;
  Detecting a fluid temperature in a cooling fluid path provided in the inverter;
  A cooling abnormality detection method comprising: determining that a circulation failure of the cooling fluid has occurred when a temperature difference obtained by subtracting the fluid temperature from an element temperature of the inverter is smaller than a predetermined value.   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting an element temperature of the inverter;
  Detecting a fluid temperature in a cooling fluid path provided in a cooling fluid pump for pumping the cooling fluid;
  A cooling abnormality detection method comprising: determining that a cooling fluid circulation failure has occurred when a temperature difference obtained by subtracting the fluid temperature from an element temperature of the inverter is greater than a predetermined value.   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting an element temperature of the inverter;
  Detecting a fluid temperature before heat is recovered by a heat recovery device interposed in a cooling fluid path for circulating the cooling fluid and recovering heat of the inverter absorbed by the cooling fluid;
  A cooling abnormality detection method comprising: determining that a cooling fluid circulation failure has occurred when a temperature difference obtained by subtracting the fluid temperature from an element temperature of the inverter is greater than a predetermined value.   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting a temperature of a cooling fluid supplied to a cooling fluid path provided in the inverter as a first fluid temperature;
  Detecting either the temperature of the cooling fluid before being supplied to the cooling fluid path provided in the inverter or the temperature of the cooling fluid discharged from the cooling fluid path provided in the inverter as the second fluid temperature When,
  Cooling when the temperature difference obtained by subtracting the second fluid temperature from the first fluid temperature is greater than a predetermined value, determining that a circulation failure of the cooling fluid has occurred. Anomaly detection method.   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting a temperature of a cooling fluid supplied to a cooling fluid path provided in the inverter as a first fluid temperature before driving a cooling fluid pump that pumps the cooling fluid;
  Detecting a temperature of a cooling fluid supplied to a cooling fluid path provided in the inverter as a second fluid temperature after the cooling fluid pump is driven;
  Cooling when the temperature difference obtained by subtracting the second fluid temperature from the first fluid temperature is a negative value, and determining that a poor circulation of the cooling fluid has occurred. Anomaly detection method.   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter;
  A cooling abnormality detection method comprising: determining that a cooling fluid circulation failure has occurred when an increase rate of the temperature of the cooling fluid detected during traveling of the vehicle is greater than a predetermined value. .   A cooling abnormality detection method for a cooling device that circulates a cooling fluid to cool an inverter,
  Detecting an element temperature of the inverter;
  Detecting an energization current of the inverter;
  Estimating the temperature of the cooling fluid supplied to the cooling fluid path provided in the inverter based on at least the element temperature of the inverter and the energization current of the inverter;
  Detecting the temperature of the cooling fluid in the cooling fluid path provided in the inverter;
  Determining whether or not circulation failure of the cooling fluid has occurred based on a temperature difference between the estimated temperature of the cooling fluid and the detected temperature of the cooling fluid. Cooling abnormality detection method.

Images