JPH07298401A - Vehicle drive cooling system - Google Patents

Abstract

(57) [Summary] [Purpose] A vehicle drive that can cool a motor-generator with water only when it is at high output, so that it can handle high output with a small amount of water and can downsize the motor-generator. An apparatus cooling device is provided. A water tank 3 is provided with a motor generator 1 that operates as a drive motor during vehicle acceleration and power running, and as a power recovery generator during vehicle braking.
A nozzle 6 for injecting water, and a water injection motor 5 for driving water, and when the temperature of the motor generator 1 exceeds a set value, the water injection motor 5 is driven to drive the motor generator from the nozzle 6. The motor generator 1 is cooled by directly injecting water into the motor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to an electric vehicle (hereinafter,
The present invention relates to a vehicle drive device such as EV), and particularly to a cooling device for a motor generator.

[0002]

2. Description of the Related Art As is well known, the maximum output rating of a motor generator is determined by the limit temperature used. Means such as natural cooling, forced air cooling and forced liquid cooling are selected so that the motor generator falls within this limit temperature.

For the above reasons, in order to increase the maximum output rating of the motor generator, it is necessary to increase the capacity of the cooling means or increase the size of the motor generator to reduce the loss that causes heat generation. is there.

[0004]

In the conventional way of thinking about the motor generator, even if the required output is short time, the cooling means that matches this output is selected or the motor generator is made large. In vehicles such as EVs, there is a limit to the space for mounting various devices, and therefore there is a demand for the size of the motor generator to be as small as possible. On the other hand, there is a trade-off relationship that the motor generator is inevitably large in size in the conventional way of thinking because the output varies greatly.

The invention of claim 1 has been made to solve the above problems. Since the motor generator can be cooled with water only at the time of a large output, a large amount of water can be used for a large output. An object of the present invention is to obtain a cooling device for a vehicle drive device that can be realized and can reduce the size of a motor generator.

According to a second aspect of the present invention, there is provided a cooling device for a vehicle drive device capable of preventing the motor generator from burning or melting by suppressing the output of the motor generator when the amount of cooling water falls below a predetermined amount. The purpose is to get.

According to a third aspect of the present invention, a vehicle for which continuous overload operation is eliminated, cooling suitable for control capable of producing a large output in a short time can be performed, and traveling that can exhibit maneuverability for a short time is possible. The purpose is to obtain a cooling device for a drive unit.

According to a fourth aspect of the invention, the set value of the temperature at which water is injected is linked to the insulation grade of the motor generator,
An object of the present invention is to obtain a cooling device for a vehicle drive device that can reduce the amount of water used.

It is an object of the present invention to obtain a cooling device for a vehicle drive device that is inexpensive and can reduce the space occupancy rate by sharing the parts of the wiper device that the vehicle basically has. To do.

[0010]

According to a first aspect of the present invention, there is provided a cooling device for a vehicle drive device, which operates as a drive motor during acceleration and power running of the vehicle, and as a power recovery generator during braking of the vehicle. A water tank, a nozzle for injecting water, and a water injection motor for driving water, and driving the water injection motor when the temperature of the motor generator exceeds a set value. The nozzle directly injects water into the motor generator.

A cooling device for a vehicle drive device according to a second aspect of the present invention includes a water amount sensor for detecting the amount of water in a water tank,
A water amount determination device that receives a signal from the water amount sensor and generates a signal when the amount of water in the water tank falls below a predetermined amount, a motor generator control device that controls the output of a motor generator, and the water amount determination An output suppression command device that sends an output suppression command signal to the motor generator control device when it receives the signal from the device to suppress the output of the motor generator.

According to a third aspect of the present invention, there is provided a cooling device for a vehicle drive device, which includes a temperature discriminating device which operates a water injection motor by generating a signal when the temperature of the motor generator rises to a preset temperature. A motor / generator control device that controls the output of the generator, and receives the signal from the temperature determination device to integrate the water injection time of the water injection motor, and the water injection time integrated value is within a certain time range. A first timing device that generates a signal when it reaches a predetermined value, and a signal from the first timing device that receives an output suppression command signal to the motor generator control device to suppress the output of the motor generator. An output suppression command device, a second timing device that generates a signal when the time after the first timing device generates a signal reaches a preset output suppression time, and the second timing device In response to the signal from the device, The generator control unit sends output suppression release command signal, is provided with a output derepression command device to release the output inhibiting state of the electric generator.

In the cooling device for a vehicle drive device according to the fourth aspect of the present invention, the set value of the temperature for injecting water is equal to or more than the limit value of the continuous rated temperature of the insulation grade of the motor generator. Is what is.

According to a fifth aspect of the present invention, there is provided a cooling device for a vehicle drive device, wherein the water tank and the water injection motor described above share a vehicle wiper device.

[0015]

According to the first aspect of the invention, by utilizing the large latent heat of vaporization (evaporation heat) that water has, when the temperature of the motor generator exceeds the set value, water is directly injected to this motor generator. To evaporate the water and cool with this heat of evaporation.

According to the second aspect of the present invention, when the amount of water in the water tank falls below a predetermined amount, the output suppressing device operates the motor generator control device to suppress the output of the motor generator.

According to the third aspect of the invention, when the first timing device detects that the integrated value of the water injection time exceeds a certain value within a certain time, the output suppression command device activates the motor generator control device. The output of the motor generator is suppressed,
After that, when a predetermined output suppression time set in the second timing device elapses, the output suppression cancellation command device operates the motor generator control device to release the output of the motor generator from the suppressed state and returns to the normal state. Therefore, it is possible to perform the cooling suitable for the control that can output the large output in a short time by eliminating the continuous overload operation.

In the invention of claim 4, the set value of the temperature for injecting water is equal to or more than the limit value of the continuous rated temperature of the insulation grade of the motor generator, so that the water used The quantity is reduced.

In the fifth aspect of the invention, the water tank and the water injection motor share the wiper device of the vehicle, so that the cooling device is inexpensive and the space occupancy rate is small.

[0020]

【Example】

Example 1. One embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic view showing an example using an EV motor generator. In the figure, 1 is a motor generator, 2 is a temperature sensor attached to the motor generator 1, 3 is a water tank, 4 is a water tank 3 In the water, 5 is a water injection motor for driving the water 4, 6 is a nozzle for injecting the water 4, 7 is a water supply pipe, 8 is an output of the temperature sensor 2, and the temperature of the motor generator 1 is preset. A signal is generated when the temperature is equal to or higher than the first temperature, and the temperature of the motor generator 1 is a preset second temperature (this second temperature has the same value or a different value as the first temperature, if desired). Can be set to the same value as the first temperature, but it will generally be the same as the first temperature). A motor drive signal was sent to the motor 5, and the signal from the temperature determination device 8 was stopped. A motor drive signal device for feeding the motor drive stop signal to the water injection motor 5.

Next, the operation will be described. Motor generator 1
, The temperature of the motor generator 1 rises in response to this output, and the temperature sensor 2 sends this temperature information to the temperature determination device 8. The temperature discrimination device 8 outputs a signal to the motor drive signal device 9 when the temperature information sent from the temperature sensor 2 becomes equal to or higher than the first temperature. Motor drive signal device 9
Outputs a motor drive signal to the water injection motor 5 by this signal to operate the water injection motor 5. Water injection motor 5
Is activated, the water 4 is sprayed from the nozzle 6 to the outer periphery of the motor generator 1, and the water 4 is evaporated by the heat of the motor generator 1 which is at a high temperature. The water 4 absorbs heat during evaporation and lowers the temperature of the motor generator 1. In this way, the motor generator 1
Since the motor / generator 1 is cooled with water 4 only when the large output of
A small amount of water can be used for high output, and the motor generator 1 can be downsized.

When the temperature of the motor generator 1 drops, the temperature sensor 2 on the motor generator 1 sends this temperature information to the temperature discriminating device 8. The temperature discrimination device 8 stops the signal to the motor drive signal device 9 when the sent temperature information becomes equal to or lower than the second temperature. The motor drive signal device 9 is
By this signal stop, a motor drive stop signal is output to the water injection motor 5 to stop the water injection motor 5. Therefore, the injection of the water 4 from the nozzle 6 is stopped. Hereinafter, this cycle is repeated.

It is said that the maximum output required by the motor generator 1 for driving the EV is 5 to 10 times that during normal running on a flat road. However, the duration of this maximum output is short, not exceeding 1 minute. Therefore,
The amount of water required for the cooling device according to the present invention is relatively small because it is necessary only for this high output.

Although the water injection motor 5 is provided in the water supply pipe 7 as an example, it may be a so-called in-tank type provided in the water tank 3.

Example 2. Another embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram showing the entire apparatus,
The same or corresponding parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof is omitted. In the figure, 10 is a water amount sensor for detecting the amount of water in the water tank 3, and 11 is a signal generated from the water amount sensor when the amount of water in the water tank 3 falls below a predetermined amount. The water amount determination device 12 is an output suppression command device that sends an output suppression command signal to a motor generator control device 13 that controls the output of the motor generator 1 and an alarm device 14 when receiving a signal from the water amount determination device 11, When the motor generator control device 13 receives the output suppression command signal, it controls the motor generator 1 to suppress (decrease) its output so that the motor generator 1 outputs motive power that does not cause burnout. Generates an appropriate warning signal such as visible or audible when receiving the output suppression command signal.

In this embodiment, a device for preventing burnout or melting damage of the motor generator 1 is added when the amount of water for injection cooling the motor generator 1 falls below a predetermined amount. That is, the water amount sensor 10 and the water amount determination device 11
When detects that the amount of water in the water tank 3 has dropped below a predetermined amount, the water amount determination device 11 outputs a signal to the output suppression command device 12. The output suppression command device 12 that has received this signal issues an output suppression command signal to the motor generator control device 13. Upon receipt of this signal, the motor generator control device 13 controls the motor generator 1 so that the motor generator 1 outputs power that does not burn the motor generator 1. This prevents burning or melting of the motor generator 1. The water injection motor 5 can be stopped by sending the signal from the water amount determination device 11 to the motor drive signal device 9 to generate a motor drive stop signal.

Furthermore, by issuing the output suppression command signal of the output suppression command device 12 to the alarm device 14, the occupant can be warned that the amount of cooling water has dropped below a predetermined amount, and water can be urged. .

Example 3. Another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic view showing the entire apparatus,
The same or corresponding parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof is omitted. Note that this embodiment eliminates continuous overload operation in accordance with the purpose of the short-time rating which is the purpose of the device of the present invention. That is, if the vehicle continuously travels at a speed higher than the specified speed, or if the speed is forcibly increased on an ascending slope, the motor generator 1 will always be at a high temperature, and the water 4 in the water tank 3 will disappear in a short time. The purpose is to prevent the aim from not being able to exert its maneuverability for a short time.

Now, referring to FIG. 3, when the temperature of the motor generator 1 rises and the temperature discriminating device 8 generates a signal, the reference numeral 15 receives this signal and integrates the water injection time of the water injection motor 5. , A first time measuring device for generating a signal when the integrated value of the water injection time reaches a predetermined value within a fixed time, and 16 denotes a time after the first time measuring device generates the signal at a preset time. The second timer 17, which generates a signal when reaching, receives the signal from the second timer 16 and sends an output suppression cancellation command signal to the motor generator control device 13 to change the output suppression state of the motor generator 1. It is an output suppression cancellation command device for canceling.

Although not shown, the first clock device 15 receives a signal from the temperature discriminating device 8, that is, the water jet motor 5
Is operated even once, a water injection time integrator that integrates the water injection time of the water injection motor 5 (operating time of the water injection motor 5) and a reference time integrator that repeats and integrates time over a fixed time, And a comparator that generates a signal when the integrated value of the water injection time exceeds a preset predetermined value during the integration of the fixed time by the time integrator. When the reference time integrator is integrated for a certain period of time or reset,
Immediately, the integration of the above-mentioned certain time is restarted.

However, if the fixed time accumulated by the reference time accumulator is, for example, 10 minutes, and the predetermined value of the accumulated time of the water injection time is, for example, 3 minutes, the accumulated time of 10 minutes by the reference time accumulator. When the integrated value of the water injection time exceeds 3 minutes within the range of 1, a signal is sent from the first timing device 15 to the output suppression command device 12.

Although not shown in the figure, the second time counting device 16 is a reference time integrator for integrating the time since the first time measuring device 15 generated a signal, and the reference time integrator integrated the time. There is provided a comparator which compares the time with a preset time for suppressing the output of the motor generator 1 and generates a signal when the integrated reference time reaches the set time.

In this embodiment, the output suppression time is changed according to the temperature of the motor generator 1. Therefore, the temperature discriminating device 8 has the first temperature and the first temperature explained in the embodiment of FIG. A set value 1 as the second temperature and a set value 2 higher than that are set, and whether the temperature of the motor generator 1 is lower than the set value 1 or between the set value 1 and the set value 2, It has a function to determine whether the set value 2 is exceeded. Also,
The second timing device 16 includes an output suppression time (hereinafter referred to as output suppression time 1) when the temperature of the motor generator 1 is between the set value 1 and the set value 2, and the set value 2 The output suppression time in the case of exceeding (this time is longer than the output suppression time 1 and hereinafter referred to as the output suppression time 2) is selectively set according to the temperature determination result of the temperature determination device 8. The output suppression time 1 and the output suppression time 2 are each selected as a time required to sufficiently cool the motor generator 1.

Then, the set value 1 is set to, for example, 180
C, set value 2 is 220 ° C., output suppression time 1 is 5 minutes, and output suppression time 2 is 10 minutes, the temperature of motor generator 1 is 1
In the case of 80 ° C. to 220 ° C., when the output suppression time of the motor generator 1 exceeds 5 minutes, a signal is sent from the second timing device 16 to the output suppression cancellation command device 17, and the temperature of the motor generator 1 is changed. When the output suppression time exceeds 220 ° C. when the temperature exceeds 220 ° C., a signal is sent from the second timing device 16 to the output suppression cancellation command device 17 and the output of the motor generator 1 is the same as the original It is returned to the suppressed state.

Next, the operation of the embodiment shown in FIG. 3 will be described with reference to the flowchart shown in FIG. In FIG. 4, step S0
From 1 to S03 is an initialization process after the key of the vehicle is pressed, and in step S02, the reference time integrator of the first timing device 15 starts integration for a fixed time (10 minutes). .

When the temperature of the motor generator 1 is lower than the set value 1 (180 ° C.) of the temperature discriminating device 8, the temperature discriminating device 8 sends a signal to the motor drive signal device 9 as shown in steps S04 to S06. No, the water injection motor 5 does not operate,
The water jet time integrator also does not work.

When the temperature of the motor generator 1 rises above the set value 1 (180 ° C.) of the temperature discriminating device 8, the temperature discriminating device 8 judges this (step S04) and sends a signal to the motor drive signal device 9. The water injection motor 5 is operated (step S11) to cool the motor generator 1 and lower its temperature. The temperature determination device 8 determines that the temperature of the motor generator 1 does not exceed the set value 2 (220 ° C.) (it does not actually exceed the set value 2 at this point) (step S
12) Confirm the operating state (ON or OFF) of the water injection time accumulator of the first timing device 15 (step S1).
3) Operate this water injection time integrator (step S1)
4).

Thus, the above-mentioned water injection time integrator of the first timing device 15 starts the integration of the water injection time. The comparator determines whether the integrated value of the water injection time has reached a predetermined value (3 minutes) during the integration of the fixed time (10 minutes) by the reference time integrator (step S15 and step S1).
6), if it has not reached, no signal is generated, and therefore no signal is generated from the first timing device 15, the first timing device 15 is reset, the output suppressing device 12 remains inactive, and The reference time integrator of the clock device 15 restarts integration for a fixed time (10 minutes).

On the other hand, the integrated value of the water injection time integrator is a predetermined value (3 minutes) during the fixed time integration by the reference time integrator.
Is reached, a signal is generated from the first timing device 15 according to the YES condition in step S15. At the same time, the output suppression time 1 is set in the second timing device 16 by the signal from the temperature determination device 8 (step S21) and the first suppression time is set.
Output suppression command device 12 by a signal from the clock device 15
Operates (step S22), and the second timing device 16
The time integration operation of the reference time integrator is started (step S23). At the same time, the alarm device 14 is also operated (step S24). Further, the signal from the first timing device 15 is also sent to the motor drive signal device 9 to stop the water injection motor 5 (step S25).

The comparator of the second timing device 16 is the time accumulated by the reference time integrator, that is, the output suppression command device 1
The time from when the output suppression of the motor generator 1 is started by 2 is compared with the output suppression time 1 (5 minutes), and a signal is generated when this integrated time reaches the output suppression time 1 (step S26). , The second timing device 16 is stopped (step S
27) and is reset (step S28). This second
The signal from the clock device 16 causes the output suppression cancellation command device 17 to operate (step S29) to return the motor generator control device 13 to the normal state and bring the motor generator 1 out of the output suppression state. At the same time, the operation of the alarm device 14 is stopped (step 30), the first time measuring device 15 is also reset (step S31), and the reference time integrator restarts integration for a fixed time.

The temperature of the motor / generator 1 is set to the set value 1 of the temperature discriminator 8 when continuously operating on a steep slope over its capacity.
Even if the injection of water is started at the time of exceeding (180 ° C.), the temperature does not decrease, and the temperature may rise beyond the set value 2 (220 ° C.). In that case, the process proceeds from step S12 to step S41 and the second timing device 1
6 output suppression time 1 (5 minutes) longer output suppression time 2
(10 minutes) is set to enter the output suppression state, the operations from step S22 to step S31 are performed, the motor generator 1 is sufficiently cooled, and the original state is restored. When the temperature of the motor generator 1 falls below the set value 1 of the temperature determination device 8 due to the water injection, the water injection motor 5 is stopped by the steps S05 and S06, and the first timing device 15
The water injection time integrator in (2) also stops the integration.

The above operation is briefly summarized as follows. That is, when the temperature of the motor generator 1 is lower than the set value 1 of the temperature determination device 8, the cooling device does not operate. When the temperature of the motor generator 1 exceeds the set value 1, the water injection motor 5 operates to cool the motor generator 1. If the large output is short, such as when accelerating or overtaking, the water injection motor 5 is operating for a short time, so the integrated value of the water injection time integrator is the fixed time of the reference time integrator. Does not exceed the predetermined value during the integration, the first timing device 15 is reset and the output suppression command device 12 does not operate. However, if it is continuously used with a large output, the operation frequency of the water injection motor 5 increases and the integrated time from the start of water injection exceeds a predetermined value during the integration of the reference time integrator for a certain time. At that time, the injection of water is stopped at that time to save water consumption, while the output of the motor generator 1 is suppressed for a predetermined time (output suppression time 1) to sufficiently cool the motor generator 1. When the temperature is not decreased by the water injection, but rather the temperature is increased and exceeds the set value 2 of the temperature determination device 8, the water injection is stopped in the same manner as above, and the predetermined time longer than the predetermined time (output suppression The output of the motor generator 1 is suppressed over time 2) to sufficiently cool it.

In the above-described embodiment, the reference time integrator of the first time counting device 15 is set to the fixed time (10) immediately after the integration of the fixed time is completed or reset.
Min) is restarted, so it is not constant at which point during this integration the water injection begins. When the integrated value of the water injection time by the water injection time integrator reaches 3 minutes during the integration of the reference time over 10 minutes by the reference time integrator, a signal is generated from the first timing device 15 and the motor generator 1 When suppressing the output, if water injection starts at the time when the reference time integrator has accumulated up to 8 minutes, the remaining time of the reference time integrator is 2 minutes, so even if water is continuously ejected, Since the integration time is only 2 minutes, at the time when the reference time integrator has integrated up to 10 minutes, both integrators of the first timing device 15 are reset to zero in step S17, and the reference time integrator extends for 10 minutes. Restart integration for a certain period of time. At this time, if the water injection is continuously performed, the water injection time integrator restarts the integration of the water injection time from zero and a signal is generated from the first timing device 15 when the water injection time is integrated up to 3 minutes. Then, the output of the motor generator 1 is suppressed. In such a case, the jet of water will continue for 5 minutes instead of 3 minutes, and the saving effect of water consumption may not be sufficient. To avoid this, the integration operation of the reference time integrator after the resetting of both integrators of the first timing device may be started simultaneously with the integration of the water injection time. That way, even if water is continuously sprayed, 3
Water injection is stopped by continuous injection of minutes.

Further, in the above embodiment, the functions of steps S12 and S41 of the flowchart of FIG. 4 can be omitted. In that case, only the above-mentioned set value 1 is set in the temperature discriminating device 8 and the ability to judge whether the temperature exceeds the set value 2 is unnecessary. Further, it is not necessary to set only the output suppression time 1 to the second timing device 16 and set the output suppression time 2.

Needless to say, the output suppressing function of the water amount sensor 10 and the water amount discriminating device 11 shown in FIG. 2 can be used together with the embodiment shown in FIG. Moreover, the specific numerical values of the temperature and time in the description relating to FIGS. 3 and 4 are merely examples for helping understanding of the invention.

Although the temperature is measured in the third embodiment, the detected temperature does not directly control the motor generator control device 13, but the first and second timing devices 15,
The reason for performing via 16 is as follows. That is, even if the detected temperature exceeds the set value, the motor generator 1 is basically not in the suppression mode. That is, even when the temperature of the motor-generator 1 rises due to acceleration at the time of getting on a highway or when overtaking, water is injected and cooled. Normally, since the mode is for a short time, the output of the motor returns to a low output by normal control during this period, not by suppression. That is, when directly interlocking with the motor generator control device 13, both suppression and non-suppression modes frequently occur, which gives an occupant anxiety, and thus a kind of hysteresis is desired to be provided.

Example 4. In this embodiment, the set value of the temperature at which water is injected is equal to or more than the limit value of the continuous rated temperature of the insulation grade of the motor generator 1. The grade of the insulating material of the motor generator 1 shown in each of the above examples is determined by the life with respect to temperature. For example, in the case of Class H, the continuous rated temperature is 180 ° C. As is well known, the life of the insulating material is the tenth degree rule (for example, "Electrical Material [New Edition]" published by Kyoritsu Shuppan Co.
(See page 6) is applicable. That is, the temperature of the insulating material is 10
The life is shortened by about 1/2 each time the temperature rises. Here, this 10 ° C. is determined by the material characteristics of the insulating material, for example, 6 ° C.
Some can be as high as 7 ° C. The breakdown temperature at which the insulating material burns or melts has a margin of about 50 ° C. with respect to the rated temperature. Therefore, in the cooling device according to the present invention, the temperature at which water should be injected takes into consideration the life that correlates with the 10 degree law. Then, it is understood that the range may be determined within this margin.

The life of the insulating material is a continuous rated temperature of 180 ° C.
It is estimated to be 20,000 hours. Generally, the life of a car is 2
Since it is estimated to be 1,000 hours, it is 1/10. For example, it is possible to continuously use at 210 ° C. or higher by collating with the above 10 degree rule. In the cooling device according to the present invention, the cooling capacity is large due to the action of the evaporation heat of the water directly injected to the motor generator 1 after detecting the high temperature, so that the temperature of the motor generator 1 becomes higher than the temperature at the time of detection. There is no worry of overshoot.

Therefore, it is not necessary to consider a large margin for the set value of the temperature for injecting water, and it is possible to set the value equal to or more than the limit value of the continuous rated temperature of the insulation grade of the motor generator 1. As a result, the number of operations of the water injection motor 5 is reduced, and the amount of water used can be reduced.

Example 5. Another embodiment of the present invention is shown in FIGS.
FIG. 7 will be described. FIG. 5 is a schematic diagram showing the entire apparatus,
FIG. 6 is a cross-sectional view showing the arrangement of the valve device, and FIG. 7 is a circuit diagram showing the control logic of the valve device. In the figure, 18 is a wiper nozzle for injecting water to a known vehicle wiper, 19 is a wiper water supply pipe for sending water to the wiper nozzle 18, and 20 is a valve device for supplying and stopping water 4 in the water tank 3. , 21 is a valve control device that controls the valve device 20, and 22 is a wiper signal device that outputs a signal for injecting the cleaning liquid.

The vehicle is always equipped with a wiper device and a device for supplying water to secure the visibility. This includes a water tank 3, a water injection motor 5, a wiper nozzle 18, a wiper water supply pipe 19, and a wiper signal device 22. In the embodiment of the present invention, these devices are shared and a valve device 20 for determining the water supply direction and a valve control device 21 for controlling the same are additionally provided.

Next, the valve device 20 has a wiper side normally open wiper valve 20a and a cooling side normally open cooling valve 20b as shown in FIG. The open state of each valve 20a, 20b is shown in FIG. 6 (a), and the closed state is shown in FIG. 6 (b). The operation will be described with reference to FIG. When the wiper signal device 22 such as a lever for activating the wiper is operated, the wiper signal from the wiper signal device 22 causes the valve control device 21 to operate and the cooling valve 20b.
Is closed and the water jet motor 5 is activated to send the water 4 only to the wiper nozzle 18. At this time, it is well known that a wiper (not shown) simultaneously operates to wipe the window glass.

The temperature of the motor generator 1 rises and the temperature sensor 2
When the detected temperature exceeds the set value of the temperature determination device 8, the motor drive signal device 9 outputs a cooling signal to both the valve control device 21 and the water injection motor 5, so the wiper valve 20a is closed and the water supply on the motor side is closed. The water 4 is supplied only to the pipe 7, and the water is supplied to the nozzle 6 for cooling the motor. The operation of the valve will be described later.

When the wiper signal device 22 is activated and water is being jetted from the wiper nozzle 18 by the water jet motor 5, the temperature of the motor generator 1 rises and the temperature discriminating device 8 is used.
When the motor drive signal device 9 is operated via, the cooling valve 20b which has been closed until then is opened, and the water 4 is supplied to both the wiper nozzle 18 and the motor cooling nozzle 6. On the contrary, when the water jet motor 5 is operated to cool the motor generator 1 and water is being jetted from the nozzle 6, the wiper signal device 22 is actuated to open the wiper valve 20a which has been closed until then. Similarly, water is supplied to both nozzles 18 and 6.

Next, the valve control device 21 will be described with reference to FIG. In FIG. 7, 23 is a NAND gate,
24 and 25 are AND gates, 26 and 27 are inverters, and 28 and 29 are AND gates. Now, when only the wiper signal is input to the valve control device 21, it is output from the AND gate 29 to close the cooling valve 20b, but since the wiper valve 20a remains open, water is supplied only to the wiper nozzle 18. On the other hand, when only the cooling signal is input to the valve control device 21, it is output from the AND gate 28 to close the wiper valve 20a, but the cooling valve 20b remains open, so that water is supplied only to the nozzle 6 for cooling the motor. Further, both the wiper signal and the cooling signal are transmitted to the valve control device 2.
When it is input to 1, both the AND gates 28 and 29 do not output, and both the wiper valve 20a and the cooling valve 20b remain open, so both the wiper nozzle 18 and the motor cooling nozzle 6 are simultaneously opened. Water is supplied.

If the wiper side valve 20a and the cooling side valve 20b are normally closed and the valve receiving the signal is opened, the control logic is simple, but the valve is normally used for safety. Open is preferred.

In the above embodiment, the valve device 20 and the valve control device 21 are provided, but the initial purpose can be achieved without these devices. That is, when the wiper signal device 22 is activated, water is sprayed on both the wiper side and the cooling side.
In this case, there is no need for injection on the cooling side, but no problem occurs in the motor generator 1. Further, when the motor drive signal device 9 is activated, water is jetted to both the cooling side and the wiper side as described above. In this case, the injection on the wiper side is not necessary, but it is only necessary to predetermine a promise to notify the passenger that the temperature of the motor generator 1 is high, for example.

Various control logics for opening and closing the valve are conceivable in addition to those described above, but are included as part of the present invention in the range where the vehicle wiper device is shared.

[0059]

As described above, according to the first aspect of the present invention, when the temperature of the motor generator exceeds the set value, the water injection motor is driven to directly inject water from the nozzle into the motor generator. As a result, the motor / generator can be cooled with water only at the time of high output, and it is possible to obtain the effects of being able to handle high power with a small amount of water and downsizing the motor / generator.

According to the second aspect of the present invention, when the cooling water becomes less than a predetermined amount, the output of the motor generator is suppressed, so that the burnout or the melting damage of the motor generator can be prevented.

According to the third aspect of the invention, continuous overload operation can be eliminated, cooling suitable for control that can produce a large output in a short time can be performed, and traveling that can exhibit maneuverability for a short time becomes possible. The effect is obtained.

According to the fourth aspect of the invention, the effect that the amount of water used can be reduced by linking the set value of the temperature at which water is injected with the insulation grade of the motor generator.

According to the fifth aspect of the invention, since the parts of the wiper device that the vehicle basically has are shared for cooling the motor generator, the cost can be reduced and the space occupancy rate of the vehicle can be reduced. can get.

[Brief description of drawings]

FIG. 1 is a schematic view of an entire apparatus showing a first embodiment of the present invention.

FIG. 2 is a schematic view of the entire apparatus showing Embodiment 2 of the present invention.

FIG. 3 is a schematic view of an entire apparatus showing a third embodiment of the present invention.

FIG. 4 is a flowchart showing a series of controls in the third embodiment of FIG.

FIG. 5 is a schematic view of an entire apparatus showing a fifth embodiment of the present invention.

6 is a cross-sectional view showing the arrangement of the valve device of FIG.

7 is a circuit diagram showing the control logic of the valve device of FIG.

[Explanation of symbols]

 1 Motor Generator 2 Temperature Sensor 3 Water Tank 4 Water 5 Water Injection Motor 6 Nozzle 7 Water Supply Pipe 8 Temperature Determining Device 9 Motor Drive Signal Device 10 Water Volume Sensor 11 Water Volume Determining Device 12 Output Suppression Command Device 13 Motor Generator Control Device 14 Alarm Device 15 First timing device 16 Second timing device 17 Output suppression cancellation command device 18 Wiper nozzle 19 Water supply pipe for wiper 20 Valve device 21 Valve control device

Claims (5)

[Claims] 1. A water tank and a water jet in a cooling device for a vehicle drive device equipped with a motor generator that operates as a drive motor during acceleration and power running of the vehicle and as a power recovery generator during braking of the vehicle. And a water injection motor for driving water, and when the temperature of the motor generator exceeds a set value, the water injection motor is driven to directly inject water from the nozzle to the motor generator. A cooling device for a vehicle drive device characterized by the above. 2. A water amount sensor for detecting the amount of water in the water tank, and a water amount discriminating device for receiving a signal from the water amount sensor and generating a signal when the amount of water in the water tank falls below a predetermined amount. A motor-generator control device that controls the output of the motor-generator, and when receiving the signal from the water amount determination device, sends an output suppression command signal to the motor-generator control device to suppress the output of the motor-generator The cooling device for a vehicle drive device according to claim 1, further comprising an output suppression command device. 3. A temperature determination device that generates a signal when the temperature of the motor generator rises to a preset temperature to operate the water injection motor, and a motor generator control device that controls the output of the motor generator. A first timing device that receives a signal from the temperature determination device, integrates the water injection time of the water injection motor, and generates a signal when the integrated value of the water injection time reaches a predetermined value within a fixed time range. , A signal from the first timing device that sends an output suppression command signal to the motor generator control device upon receiving a signal from the first timing device to suppress the output of the motor generator, and the first timing device transmits a signal. A second timing device that generates a signal when the time after the generation reaches a preset predetermined output suppression time, and a signal from the second timing device that is output to the motor generator control device Sending a suppression release command signal, electric The cooling device for a vehicle drive device according to claim 1, further comprising an output suppression cancellation command device that cancels an output suppression state of the generator. 4. The set value of the temperature for injecting water is equal to or more than the limit value of the continuous rated temperature of the insulation grade of the motor-generator, or more than this limit value. 1. A cooling device for a vehicle drive device according to any one of 1. 5. The water tank and the water injection motor share a vehicle wiper device.
4. The cooling device for a vehicle drive device according to any one of 4 above.