JP3756502B2 - Hybrid vehicle cooling system - Google Patents

Description

  The present invention relates to an internal combustion engine and a motor-driven hybrid vehicle cooling apparatus.

Conventionally, for example, with respect to a radiator provided in a cooling circuit that circulates cooling water for cooling an engine, a part of the cooling water that circulates in the radiator is diverted and circulated again in the radiator. In addition to the main flow path, an additional flow path is provided, and the cooling water flowing through this additional flow path, that is, the flow path in the radiator is relatively longer than the cooling water flowing through the main flow path. An apparatus that controls the temperature of hydraulic oil such as ATF (Automatic Transmission Fluid), for example, with cooling water having a low temperature is known (for example, see Patent Document 1).
US Pat. No. 6,196,168

By the way, conventionally, in a hybrid vehicle including a motor that is a driving source of a vehicle together with an internal combustion engine, in addition to cooling the internal combustion engine, cooling of a high-voltage electric device including a motor and an inverter that supplies electric power to the motor is performed. Necessary.
However, the internal combustion engine and the high-voltage electrical equipment may have different management temperatures. For example, even when the cooling water having a plurality of different temperatures is discharged by the radiator according to the related art as described above, When an independent cooling circuit system is provided for each of the plurality of cooling waters, there arises a problem that the device configuration becomes complicated and the mounting property on the vehicle is impaired.
The present invention has been made in view of the above circumstances, and provides a cooling device for a hybrid vehicle capable of appropriately controlling the temperature states of a plurality of devices having different management temperatures while preventing the device configuration from becoming complicated. The purpose is to do.

In order to solve the above-described problems and achieve the object, a hybrid vehicle cooling device according to a first aspect of the present invention is used as a vehicle drive source together with an internal combustion engine, and mechanically connected to an output shaft of the internal combustion engine. A motor having a connected output shaft, motor control means for controlling the operating state of the motor (for example, PDU 14 in the embodiment), and cooling for cooling the internal combustion engine and the motor control means with common cooling water A circuit (for example, each flow path 30a, 30b, 30c, 30d, 30e, 30f, 30g, and 30h in the embodiment ) and a water that is driven by the internal combustion engine to circulate the cooling water in the cooling circuit. pump (e.g., water pump 21 in the embodiment) a cooling apparatus of a hybrid vehicle and a, the cooling forms a radiator for radiating the cooling water A plurality of flow paths distribution channels are different (e.g., the main flow passage 22a and sub-passage 22b in the embodiment) and, by flowing the cooling water to each of said plurality of channels, cooling the internal combustion engine Temperature setting means for setting the management temperature set for the cooling water and the management temperature set for the cooling water for cooling the motor control means to different temperatures (for example, in the embodiment) Radiator 22 and first thermostat 23 and second thermostat 24), and the plurality of flow paths are first flow paths (for example, main flow in the embodiment) through which the cooling water for cooling the internal combustion engine flows. Path 22a), and a second flow path (for example, sub flow path 22b in the embodiment) through which the divided cooling water formed by dividing a part of the cooling water flowing through the first flow path flows. Comprising The flow path is connected to the cooling circuit of the internal combustion engine (for example, the flow path 30g in the embodiment), and the cooling water flowing only through the first flow path directly goes to the cooling circuit of the internal combustion engine. The second flow path is connected to the cooling circuit of the motor control means (for example, the flow path 30h in the embodiment), and the diverted cooling water flowing through the second flow path is the motor control After flowing through the cooling circuit of the means, the cooling water flowing through only the first flow path is joined at a position upstream of the water pump.

  According to the hybrid vehicle cooling device having the above-described configuration, the desired temperature set for the internal combustion engine and the motor control means when the common coolant is circulated to the internal combustion engine and the motor control means to control the temperature state. By setting the state, that is, the management temperature to be different from each other, it is possible to perform appropriate temperature management for each internal combustion engine and motor control means while preventing the apparatus configuration from becoming complicated.

According to the cooling device for a hybrid vehicle having the above-described configuration, by providing a plurality of flow paths having different circulation paths for the cooling water forming the radiator, for example, the temperature of the cooling water decreases as the path length of the circulation path becomes longer. The temperature of the discharged cooling water can be set to a desired temperature. This makes it easy to control the temperature states of a plurality of objects to be cooled, for example, an internal combustion engine and a motor control means, at a desired management temperature without using a plurality of independent radiators or cooling circuit systems, for example. Can do.

  According to the hybrid vehicle cooling apparatus having the above-described configuration, the water pump that circulates the cooling water in the cooling circuit can be driven by the mechanically connected internal combustion engine and the driving force of the motor, so to speak, the internal combustion engine and the motor control means. The cooling water can be circulated by a common water pump, and the device configuration can be simplified.

Furthermore, the cooling device for a hybrid vehicle according to the second aspect of the present invention includes a plurality of thermostats (for example, the first thermostat 23 and the second thermostat 24 in the embodiment) having different sensitive temperatures. The management temperature is set to a different temperature by a thermostat.

  According to the cooling device for a hybrid vehicle having the above-described configuration, by disposing a plurality of thermostats having different sensitivity temperatures at predetermined positions of the cooling circuit, cooling water having a desired temperature can be circulated in a desired flow path, The internal combustion engine and the motor control means can be independently controlled at each desired management temperature.

Furthermore, the hybrid vehicle cooling device according to the third aspect of the present invention includes a motor that is a driving source of the vehicle together with the internal combustion engine, and motor control means that controls the operating state of the motor (for example, in the embodiment). PDU 14), and a cooling circuit for cooling the internal combustion engine and the motor control means with a common cooling water (for example, the respective flow paths 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h in the embodiment) And a management temperature set for the cooling water for cooling the internal combustion engine and a management temperature set for the cooling water for cooling the motor control means. Temperature setting means for setting different temperatures (for example, the radiator 22, the first thermostat 23, and the second thermostat 24 in the embodiment) , A water jacket provided inside of the internal combustion engine, the circulation flow path and a water pump for circulating the cooling water to the water jacket (for example, the flow path 30a in the embodiment, 30b, 30c, 30d, 30f), a radiator having a plurality of flow paths (for example, the main flow path 22a and the sub flow path 22b in the embodiment) having different flow paths of the cooling water, and a position downstream of the water jacket. A supply channel (for example, the fifth channel 30e in the embodiment) that branches from the circulation channel and distributes the cooling water to the radiator, and a first thermostat that is set to have a relatively high sensitive temperature. And a first flow path (for example, the seventh flow path 30g in the embodiment) for circulating the cooling water from the radiator to the circulation flow path, and a relatively low sensitive temperature. A second flow path (for example, the eighth flow in the embodiment) that circulates the cooling water from the radiator to the circulation flow path via the second thermostat, and supplies the cooling water to the motor control means. And a bypass channel (for example, bypass channel 30j in the embodiment) that connects the supply channel and a position of the second channel on the downstream side of the second thermostat. Features.

According to the hybrid vehicle cooling device having the above-described configuration, for example, when the internal combustion engine is warming up, the cooling water bypasses the radiator by setting the first thermostat and the second thermostat to be closed. The time required to circulate and raise the internal combustion engine to a desired temperature can be shortened.
As the temperature of the cooling water flowing through the circulation flow path rises, the temperature of the cooling water supplied from the supply flow path to the downstream side of the second thermostat via the bypass flow path is lower than the predetermined sensitive temperature. When it becomes higher, the second thermostat is opened, and the cooling water flows from the radiator to the motor control means through the second flow path. Here, the cooling water flowing through the second flow path is set so as to be discharged from a flow path having a relatively long flow path among the plurality of flow paths forming the radiator. It can be controlled to a desired temperature state lower than that of the engine.
Furthermore, when the temperature of the cooling water flowing through the circulation channel rises, the first thermostat is opened, and the cooling water flows from the radiator to the circulation channel by the first channel. Here, for example, the internal combustion engine is controlled by a motor by setting the cooling water flowing through the first flow path so as to be discharged from a flow path having a relatively short flow path among the plurality of flow paths forming the radiator. It can be controlled to a desired temperature state higher than the means.

Furthermore, the cooling device for a hybrid vehicle according to a fourth aspect of the present invention is characterized in that the second thermostat is arranged at a position downstream of the motor control means.

  According to the hybrid vehicle cooling apparatus configured as described above, for example, during the warm-up operation of the internal combustion engine, the first thermostat and the second thermostat are closed, so that the cooling water bypasses the radiator and the motor control means. Since it circulates, an increase in the heat capacity in the system through which the cooling water flows can be suppressed, and the time required for raising the internal combustion engine to a desired temperature can be further shortened.

Furthermore, the hybrid vehicle cooling device of the present invention according to claim 5 arranges the motor at a position downstream of the motor control means in the second flow path, and between the motor control means and the motor. The second thermostat is disposed at the position and the bypass flow path is connected.

According to the cooling device for a hybrid vehicle having the above configuration, even when the second thermostat is in a closed state, the cooling water flowing through the bypass flow channel is supplied to the motor and then flows into the circulation flow channel. For this reason, for example, at the time of warming-up operation of the internal combustion engine, etc., the cooling water that has become relatively hot due to heat exchange with the motor being operated is supplied to the internal combustion engine, so that the internal combustion engine can be brought to a desired temperature The temperature can be raised early.
Moreover, when the second thermostat is arranged at a downstream position in the vicinity of the motor control means, the temperature control of the motor control means can be performed with high accuracy, and, for example, the occurrence of an overheat state or the like can be reliably prevented. can do.

Furthermore, the cooling device for a hybrid vehicle according to a sixth aspect of the present invention is characterized in that the second thermostat is arranged at a position upstream of the motor control means.

According to the hybrid vehicle cooling device having the above configuration, even when the second thermostat is in the closed state, the cooling water flowing through the bypass flow path is supplied to the motor control means and the motor and then flows to the circulation flow path. For this reason, for example, at the time of warm-up operation of the internal combustion engine, the internal combustion engine is desired by supplying the internal combustion engine with cooling water that has become relatively hot due to heat exchange with the motor control means and the motor during operation. The temperature can be raised to an earlier temperature.
Moreover, even if a local overheating region occurs in the motor control means or the motor due to, for example, flow rate restriction in the second thermostat, by increasing the flow rate of the cooling water flowing through the bypass flow path, Each temperature distribution inside the motor control means and the motor can be smoothed.

Furthermore, a hybrid vehicle cooling device according to a seventh aspect of the present invention includes a motor that serves as a driving source for the vehicle together with the internal combustion engine, and motor control means that controls the operating state of the motor (for example, in the embodiment). PDU 14), and a cooling circuit for cooling the internal combustion engine and the motor control means with a common cooling water (for example, the respective flow paths 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h in the embodiment) And a management temperature set for the cooling water for cooling the internal combustion engine and a management temperature set for the cooling water for cooling the motor control means. Temperature setting means for setting different temperatures (for example, the radiator 22, the first thermostat 23, and the second thermostat 24 in the embodiment) , A water jacket provided inside of the internal combustion engine, the circulation flow path and a water pump for circulating the cooling water to the water jacket (for example, the flow path 30a in the embodiment, 30b, 30c, 30d, 30f), a radiator having a plurality of flow paths (for example, the main flow path 22a and the sub flow path 22b in the embodiment) having different flow paths of the cooling water, and a position downstream of the water jacket. A supply passage (for example, the fifth passage 30e in the embodiment) that branches from the circulation passage and distributes the cooling water to the radiator, and a first thermostat that is set to have a relatively high sensitive temperature. The first flow path (for example, the seventh flow path 30g in the embodiment) that causes the cooling water to flow from the radiator to the circulation flow path via the radiator is relatively low in sensitivity temperature. The cooling water is circulated from the radiator to the circulation flow path through a second thermostat that is set, and the cooling water is supplied to the motor control means (for example, the first flow path in the embodiment). 8 channel 30h), a position between the water pump and the water jacket on the upstream side of the water jacket in the circulation channel, and a position on the downstream side of the second thermostat in the second channel. And a bypass channel (for example, bypass channel 30k in the embodiment) to be connected.

According to the cooling device for a hybrid vehicle having the above-described configuration, the cooling water supplied to the downstream position of the second thermostat via the bypass flow path is the cooling water divided in front of the water jacket, and the second thermostat The influence of the temperature state of the internal combustion engine on the operating state is suppressed.
Thereby, for example, even when the temperature of the cooling water after passing through the water jacket fluctuates in accordance with the load fluctuation of the internal combustion engine, for example, the second thermostat is excessively opened at an early timing, etc. Can be prevented, and the open / close state of the second thermostat can be controlled at an appropriate timing.

Furthermore, the cooling device for a hybrid vehicle according to an eighth aspect of the present invention includes a motor that serves as a driving source of the vehicle together with the internal combustion engine, and motor control means that controls the operating state of the motor (for example, in the embodiment). PDU 14), and a cooling circuit for cooling the internal combustion engine and the motor control means with a common cooling water (for example, the respective flow paths 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h in the embodiment) And a management temperature set for the cooling water for cooling the internal combustion engine and a management temperature set for the cooling water for cooling the motor control means. Temperature setting means for setting different temperatures (for example, the radiator 22, the first thermostat 23, and the second thermostat 24 in the embodiment) , A water jacket provided inside of the internal combustion engine, the circulation flow path and a water pump for circulating the cooling water to the water jacket (for example, the flow path 30a in the embodiment, 30b, 30c, 30d, 30f), a radiator having a plurality of flow paths (for example, the main flow path 22a and the sub flow path 22b in the embodiment) having different flow paths of the cooling water, and a position downstream of the water jacket. A supply channel (for example, the fifth channel 30e in the embodiment) that branches from the circulation channel and distributes the cooling water to the radiator, and a first thermostat that is set to have a relatively high sensitive temperature. And a first flow path (for example, the seventh flow path 30g in the embodiment) for circulating the cooling water from the radiator to the circulation flow path, and a relatively low sensitive temperature. A second flow path (for example, the eighth flow in the embodiment) that circulates the cooling water from the radiator to the circulation flow path via the second thermostat, and supplies the cooling water to the motor control means. 30h), and the second thermostat is disposed in the circulation flow path.

  According to the hybrid vehicle cooling device having the above-described configuration, for example, it is possible to simplify the device configuration without the need to provide a bypass flow channel that connects the supply flow channel and the second flow channel.

  According to the cooling device for a hybrid vehicle of the present invention, the control temperature set for the internal combustion engine and the motor control means is controlled when the common coolant is circulated to the internal combustion engine and the motor control means to control the temperature state. By setting the temperature different from each other by the temperature setting means, it is possible to perform appropriate temperature management for each internal combustion engine and each motor control means while preventing the apparatus configuration from becoming complicated.

Furthermore, according to the cooling device for a hybrid vehicle of the present invention described in claim 1 , the temperature state of a plurality of objects to be cooled, for example, the internal combustion engine and the motor control means, is easily controlled at a desired management temperature by a single radiator. be able to.
Furthermore, according to the cooling device for a hybrid vehicle of the first aspect of the present invention, the cooling water can be circulated by the common water pump for the internal combustion engine and the motor control means, thereby simplifying the device configuration. be able to.
Furthermore, according to the cooling device for a hybrid vehicle of the present invention as set forth in claim 2 , by disposing a plurality of thermostats having different sensitivity temperatures at predetermined positions of the cooling circuit, the cooling water having a desired temperature is supplied to the desired flow. The internal combustion engine and the motor control means can be independently controlled at each desired management temperature.

Furthermore, according to the cooling device for a hybrid vehicle of the present invention as set forth in claim 3 , by setting the first thermostat and the second thermostat to be in a closed state, for example, during warm-up operation of the internal combustion engine. The time required for the cooling water to circulate around the radiator and raise the internal combustion engine to a desired temperature can be shortened.
Furthermore, according to the cooling device for a hybrid vehicle of the present invention as set forth in claim 4 , for example, when the internal combustion engine is warming up, the first thermostat and the second thermostat are closed, so that the cooling water is supplied to the radiator. And by bypassing the motor control means, the increase in heat capacity in the system through which the cooling water flows is suppressed, and the time required to raise the internal combustion engine to a desired temperature is further reduced. Can do.

Furthermore, according to the cooling device for a hybrid vehicle of the present invention as set forth in claim 5 , the cooling water that has become relatively high temperature by heat exchange with the motor in operation, for example, during warm-up operation of the internal combustion engine, etc. By being supplied to the internal combustion engine, the temperature of the internal combustion engine can be raised to a desired temperature earlier. Moreover, the temperature control of the motor control means can be performed with high accuracy, and for example, it is possible to reliably prevent the occurrence of an overheated state or the like.
Furthermore, according to the cooling device for a hybrid vehicle of the present invention as set forth in claim 6 , the temperature becomes relatively high due to heat exchange between the motor control means and the motor during operation, for example, during warm-up operation of the internal combustion engine. By supplying the cooling water to the internal combustion engine, the internal combustion engine can be heated to a desired temperature earlier. Moreover, even if a local overheating region occurs in the motor control means or the motor due to, for example, flow rate restriction in the second thermostat, by increasing the flow rate of the cooling water flowing through the bypass flow path, Each temperature distribution inside the motor control means and the motor can be smoothed.

Furthermore, according to the cooling device for a hybrid vehicle of the present invention described in claim 7 , the influence of the temperature state of the internal combustion engine on the operation state of the second thermostat can be suppressed, and the opening and closing of the second thermostat can be performed at an appropriate timing. The state can be controlled.
Furthermore, according to the cooling device for a hybrid vehicle of the present invention as set forth in claim 8 , for example, it is possible to simplify the device configuration without having to provide a bypass flow path for connecting the supply flow path and the second flow path. Can do.

Hereinafter, an embodiment of a cooling device for a hybrid vehicle of the present invention will be described with reference to the accompanying drawings.
A hybrid vehicle cooling device 10 according to an embodiment of the present invention includes, for example, a hybrid vehicle 1 having a structure in which an internal combustion engine 11, a motor 12, and a transmission (T / M) 13 are directly connected in series as shown in FIG. In this hybrid vehicle 1, for example, the driving forces of both the internal combustion engine 11 and the traveling motor 12 are applied to the driving wheels W via a transmission (T / M) 13 such as a CVT or a manual transmission. Communicated.
The motor 12 generates an auxiliary driving force that assists the driving force of the internal combustion engine 11 in accordance with the operating state of the hybrid vehicle 1. Further, when the driving force is transmitted from the wheel W side to the motor 12 side during deceleration of the hybrid vehicle 1, the motor 12 functions as a generator to generate a so-called regenerative braking force, and recovers the kinetic energy of the vehicle body as electric energy. To do.

Regenerative operation and driving of the motor 12 are performed by a PDU (power drive unit) 14 in response to a control command from a motor control device (not shown). For example, the PDU 14 includes an inverter formed by bridge-connecting switching elements composed of a plurality of transistors, and is connected to a power storage device (not shown) including a high-voltage battery and the like that exchange electric energy with the motor 12. ing.
Further, in this high-voltage power storage device, a 12-volt auxiliary battery (not shown) for driving various auxiliary machines of the hybrid vehicle 1 is provided with a downverter (D / V) 15 comprising a DC-DC converter. The downverter 15 steps down the voltage of the power storage device and charges the auxiliary battery.
In the hybrid vehicle 1, the PDU 14 and the downverter 15 are disposed in the vicinity of the transmission 13, for example.

  The hybrid vehicle cooling apparatus 10 according to the present embodiment includes, for example, as shown in FIG. 2, a water pump (W / P) 21 driven by an internal combustion engine 11, a radiator 22, a first thermostat 23, and a second The thermostat 24, a water jacket 25 inside the internal combustion engine 11, a heater core 26, and first and second temperature sensors 27 and 28 are provided.

In this cooling device 10 for a hybrid vehicle, for example, a water jacket 25 is disposed on the downstream side of the water pump 21, and the coolant that has circulated through the water jacket 25 and has a relatively high temperature is two first and second cooling waters. It distribute | circulates to the flow paths 30a and 30b.
A heater core 26 is connected to the first flow path 30a via an appropriate valve 26a. The heater core 26 heats air using a relatively high-temperature cooling water as a heat source, and the heat exchanged by the heater core 26 is performed. Water returns to the water pump 21 through the third flow path 30c.

The first flow path 30a bypasses the valve 26a and the heater core 26 and is connected to the third flow path 30c. The fourth flow path 30d supplies cooling water to the throttle body 31 and the breather 32 that forms the ventilation device. Is provided.
And the 2nd flow path 30b is formed in the 5th flow path 30e for distribute | circulating a cooling water to the radiator 22, and an internal diameter smaller than this 5th flow path 30e, for example, and is connected to the 3rd flow path 30c. It branches to the sixth flow path 30f.
The second flow path 30b is provided with a first temperature sensor 27 that detects the temperature of the cooling water discharged from the water jacket 25.

  The radiator 22 includes, for example, an inlet side tank 22A connected to the fifth flow path 30e, and an outlet side tank 22B connected to the seventh flow path 30g connected to the third flow path 30c via the first thermostat 23. The main flow path 22a inside the radiator connecting the inlet side tank 22A and the outlet side tank 22B, and the sub flow path 22b inside the radiator connected to the outlet side tank 22B are configured. Further, for example, an eighth flow path 30h that supplies cooling water to the heat sink portions 14a and 15a of the PDU 14 and the downverter 15 that are arranged to face each other and the cooling flow path 12a of the motor 12 is connected to the sub flow path 22b. The eighth flow path 30h is connected to the third flow path 30c via the second thermostat 24.

That is, the interior of the radiator 22 is partitioned into a main flow path 22a and a sub flow path 22b by a partition plate or the like, and the main flow path 22a and the sub flow path 22b are configured to communicate with each other in the outlet side tank 22B.
And the cooling water introduced into the inlet side tank 22A of the radiator 22 from the 5th flow path 30e first distribute | circulates the main flow path 22a inside the radiator 22, and appropriate 1st temperature (for example, about 80 degreeC etc.). Until cooled.
Next, at least a part of the cooling water flowing through the main flow path 22a and introduced into the outlet side tank 22B flows through the sub flow path 22b inside the radiator 22, and the flow path inside the radiator 22 is relatively By being long, it is possible to cool to an appropriate second temperature (for example, about 60 ° C. or the like) lower than the first temperature.
A second temperature sensor 28 that detects the temperature of the cooling water discharged from the cooling flow path 12a of the motor 12 is provided at a position downstream of the motor 12 in the eighth flow path 30h. When the detection result output from the sensor 28 exceeds a predetermined temperature, the cooling fan 29 that cools the radiator 22 is set to operate.

Furthermore, the fifth flow path 30e is provided with a bypass flow path 30j that has an inner diameter smaller than that of the fifth flow path 30e and is connected to the eighth flow path 30h. The bypass flow path 30j is connected to the eighth flow path 30h in the vicinity of the second thermostat 24, and the open / close state of the second thermostat 24 is controlled by the temperature of the cooling water flowing through the bypass flow path 30j. Regardless of the open / closed state of the second thermostat 24, the cooling water can be circulated from the fifth flow path 30e to the bypass flow path 30j.

  The first and second thermostats 23 and 24 are set to change from the closed state to the open state when the temperature of the cooling water is in a high temperature state exceeding each predetermined temperature, and mainly the temperature of the internal combustion engine 11. Compared to a predetermined first set temperature (for example, about 82 ° C.) at which the first thermostat 23 that performs adjustment is in an open state, a second thermostat 24 that mainly performs temperature adjustment of the high-pressure system is in a predetermined state at which the adjustment is performed. The second set temperature (for example, about 65 ° C.) is set to a lower temperature.

  The hybrid vehicle cooling device 10 according to the present embodiment has the above-described configuration. Next, the operation of the hybrid vehicle cooling device 10 will be described.

In this cooling device 10 for a hybrid vehicle, when the temperature of the cooling water is relatively low, such as when the internal combustion engine 11 is started, the first thermostat 23 and the second thermostat 24 are closed, for example, FIG. The cooling water discharged from the water jacket 25 returns to the water pump 21 so as to bypass the radiator 22 as shown in a distribution path Fa (for example, broken line arrow Fa in FIG. 2).
That is, the cooling water discharged from the water jacket 25 sequentially flows through the first flow path 30a, the heater core 26 or the fourth flow path 30d, and the third flow path 30c, or the second flow path 30b and the sixth flow path. It flows through the flow path 30f or the fifth flow path 30e, the bypass flow path 30j, and the third flow path 30c and returns to the water pump 21.

When the temperature of the cooling water becomes higher than a predetermined second set temperature (for example, about 65 ° C.), the second thermostat 24 is opened. For example, the flow path Fb shown in FIG. 2 (for example, the solid arrow in FIG. 2) As in Fb), the cooling water discharged from the water jacket 25 further circulates to the radiator 22 and is cooled in two steps in the course of flowing through the main flow path 22a and the sub flow path 22b of the radiator 22. Are supplied to the PDU 14, the downverter 15, and the motor 12.
That is, the cooling water discharged from the water jacket 25 is, in order, the first flow path 30a, the fifth flow path 30e, the main flow path 22a, the sub flow path 22b, the eighth flow path 30h, the second thermostat 24, It flows through the third flow path 30 c and returns to the water pump 21.

  When the temperature of the cooling water becomes higher than a predetermined first set temperature (for example, about 82 ° C.), the first thermostat 23 is opened, and the cooling water flowing through the main flow path 22a of the radiator 22 The third flow passage 30c is circulated from the seventh flow passage 30g through the first thermostat 23, and then returned to the water pump 21.

According to the hybrid vehicle cooling device 10 of the present embodiment, the main flow path 22a and the sub flow path 22b communicating with the main flow path 22a are provided inside the single radiator 22, and the cooling water is so-called in two stages. By making it possible to lower the temperature, the system configuration and the flow path of the cooling water are suppressed from becoming complicated, and a plurality of systems having different management temperatures, for example, the internal combustion engine 11 and relative to the internal combustion engine 11 are relative to each other. The high temperature system (for example, PDU 14, downverter 15, motor 12, etc.) that is set to a low temperature state can be appropriately controlled with a common cooling water.
In addition, by combining the cooling water discharged from a plurality of systems having different management temperatures on the upstream side of the single water pump 21, the temperature state of each system deviates from a desired state while simplifying the device configuration. Can be easily suppressed.
In addition, since the first thermostat 23 and the second thermostat 24 are provided and the cooling water is set to circulate around the radiator 22 and the high-pressure system, for example, during the warm-up operation of the internal combustion engine 11, It is possible to improve the temperature rise characteristic when raising the temperature of the system to a desired temperature.

  In the above-described embodiment, the cooling water after cooling the PDU 14 and the downverter 15 is supplied to the cooling flow path 12a of the motor 12. However, the present invention is not limited to this. The cooling flow path 12a may be bypassed and distributed to the second thermostat 24 to cool the motor 12 with air.

In the above-described embodiment, the second thermostat 24 is disposed at the downstream position of the motor 12 in the eighth flow path 30h. However, the present invention is not limited to this. For example, the second thermostat 24 in the present embodiment shown in FIG. You may arrange | position in the position of the downstream of each heat sink part 14a, 15a of PDU14 and the downverter 15 like 1 modification.
In this case, even when the second thermostat 24 is in the closed state, the cooling water flowing through the bypass flow path 30j is introduced into the water jacket 25 after flowing through the cooling flow path 12a of the motor 12. For this reason, for example, at the time of starting the hybrid vehicle 1 or the like, the cooling water having a relatively high temperature in the process of flowing through the cooling flow path 12a of the motor 12 during operation is supplied to the internal combustion engine 11, thereby 11 can be raised to a desired temperature earlier, and the time required for the warm-up operation of the internal combustion engine 11 can be shortened.
In addition, since the second thermostat 24 is disposed at a downstream position in the vicinity of the PDU 14 and the downverter 15, for example, the temperature management of the PDU14 and the downverter 15 can be performed with high accuracy, for example, an overheat state or the like occurs. Can be reliably prevented.

Further, for example, as in the second modification of the present embodiment shown in FIG. 4, the second thermostat 24 is arranged at the upstream side of the heat sink portions 14a, 15a of the PDU 14 and the downverter 15 in the eighth flow path 30h. May be.
In this case, even when the second thermostat 24 is closed, the cooling water flowing through the bypass flow path 30j passes through the heat sink portions 14a and 15a of the PDU 14 and the downverter 15 and the cooling flow path 12a of the motor 12. After being distributed, it is introduced into the water jacket 25. For this reason, for example, when the hybrid vehicle 1 is started, the cooling that has become relatively high in the process of flowing through the heat sink portions 14a and 15a of the PDU 14 and the downverter 15 that are in operation and the cooling flow path 12a of the motor 12. By supplying water to the internal combustion engine 11, the temperature of the internal combustion engine 11 can be raised to a desired temperature earlier, and the time required for the warm-up operation of the internal combustion engine 11 can be further shortened. it can.
Moreover, the flow rate of the cooling water flowing through the bypass flow path 30j is reduced even when a local overheating region is generated inside the PDU 14, the downverter 15 or the motor 12 due to, for example, the flow rate restriction in the second thermostat 24. By increasing it, each temperature distribution inside the PDU 14, the downverter 15 and the motor 12 can be smoothed.

In the above-described embodiment, the bypass channel 30j that connects the fifth channel 30e and the eighth channel 30h is provided. However, the present invention is not limited to this, and for example, the present embodiment shown in FIG. Like the 3rd modification, you may provide the bypass flow path 30k which connects the position of the upstream of the water jacket 25, and the 8th flow path 30h.
In this case, the cooling water supplied to the second thermostat 24 via the bypass flow path 30k is the cooling water divided before the water jacket 25, and the temperature state of the internal combustion engine 11 with respect to the operating state of the second thermostat 24. The influence of is suppressed. For example, even when the temperature of the cooling water after passing through the water jacket 25 fluctuates according to the load fluctuation of the internal combustion engine 11, for example, the second thermostat 24 is opened at an excessively early timing. Can be prevented, and the open / close state of the second thermostat 24 can be controlled at an appropriate timing.

In the above-described embodiment, the bypass channel 30j that connects the fifth channel 30e and the eighth channel 30h is provided. However, the present invention is not limited to this, and for example, the present embodiment shown in FIG. As in the fourth modification, the fourth flow path 30d may be connected to the eighth flow path 30h instead of the bypass flow path 30j.
In this case, the bypass flow path 30j can be omitted, and the device configuration can be simplified.

Below, the 5th modification of embodiment mentioned above is demonstrated with reference to FIG. 7 and FIG.
In the hybrid vehicle cooling device 10 according to the fifth modified example, the main points different from the above-described embodiment are that the eighth flow path 30h is shifted to the upstream side from the PDU 14 and the downverter 15, and the eighth flow The point is that two U-shaped pipes 30k, 30k are provided at positions shifted downstream from the second thermostat 24 of the path 30h. In the fifth modification, the bypass flow path 30j that connects the fifth flow path 30e and the eighth flow path 30h is omitted.
Each U-shaped pipe 30k has a U-shaped bent portion below the connecting portion with the eighth flow path 30h in the vertical direction (for example, the V direction shown in FIG. 7) (that is, the −V direction shown in FIG. 7). ).
According to the hybrid vehicle cooling device 10 according to the fifth modified example, when the circulation of the cooling water in each flow path is stopped in accordance with the stop of the operation of the internal combustion engine 11 such as at the time of idling stop, immediately after the stop of the operation or the like. The temperature of the cooling water in the water jacket 25 of the relatively high temperature internal combustion engine 11 rises, and convection (that is, heat transfer) due to the temperature difference of the cooling water occurs in the cooling water flow path. Even when the relatively high-temperature cooling water reaches the vicinity of the U-shaped pipes 30k and 30k from the internal combustion engine 11 side by this convection, the high-temperature cooling water convects downward in the vertical direction (that is, Therefore, the heat of the internal combustion engine 11 is transmitted to the PDU 14 and the downverter 15 sandwiched between the two U-shaped pipes 30k and 30k. It is possible to prevent the PDU 14 and the downverter 15 from rising beyond a predetermined management temperature.
In the fifth modification, the two U-shaped pipes 30k and 30k are provided at a position shifted upstream from the PDU 14 and the downverter 15 and at a position shifted downstream from the second thermostat 24. However, the present invention is not limited to this, and it is only necessary that the U-shaped pipe 30k is provided at least one of a position shifted upstream from the PDU 14 and the downverter 15 or a position shifted downstream from the second thermostat 24.

In the hybrid vehicle cooling device 10 according to the fifth modification, the thermostats 23 and 24 are so-called wax type thermostats. For example, as shown in FIG. And a discharge passage 42 through which cooling water is discharged, a valve body 43 that can block the flow of cooling water between the inflow passage 41 and the discharge passage 42, a spring 44, and the axis Q direction. The pellet 45 supported by the pellet 45, the wax (operating body) 46 accommodated in the pellet 45, the contact portion 47 with which the valve body 43 abuts when the coolant flow is interrupted, and the regulation for restricting the movement of the valve body 43 And a member 48.
The valve body 43 is integrally connected to the pellet 45 containing the wax 46, and the spring 44 closes the pellet 45 in the valve closing direction along the direction of the axis Q (that is, the valve body 43 is close to the contact portion 47. The wax (operating body) 46 expands and contracts in volume according to the temperature of the cooling water.
When the wax 46 is in the volume contraction state, the valve body 43 comes into contact with the contact portion 47 by the urging force of the spring 44 and the valve 46 is closed. On the other hand, when the wax 46 expands in volume, the pellet 45 moves in the valve opening direction along the axis Q direction against the biasing force of the spring 44 (that is, the valve body 43 moves away from the contact portion 47). ) To move.
As a result, when the temperature of the cooling water is relatively low, the thermostats 23 and 24 are closed. For example, when the internal combustion engine 11 is started, the cooling water is not circulated and the internal combustion engine 11 is warmed up. To be done.
The axis Q direction of each thermostat 23, 24 is arranged so as to be inclined by a predetermined angle θ with respect to the horizontal plane, and the inflow channel 41 is arranged at a position vertically below the discharge channel 42. It has become.
Thereby, for example, even when a gas such as air is mixed in the cooling water, this gas is discharged outside from the discharge flow path 42 without stagnation in each thermostat 23, 24. Yes.

It is a mimetic diagram of a hybrid vehicle cooling device concerning one embodiment of the present invention. It is a block diagram of the cooling device of the hybrid vehicle by one Embodiment of this invention. It is a block diagram of the cooling device of the hybrid vehicle by the 1st modification of this embodiment. It is a block diagram of the cooling device of the hybrid vehicle by the 2nd modification of this embodiment. It is a block diagram of the cooling device of the hybrid vehicle by the 3rd modification of this embodiment. It is a block diagram of the cooling device of the hybrid vehicle by the 4th modification of this embodiment. It is a block diagram of the cooling device of the hybrid vehicle by the 5th modification of this embodiment. It is sectional drawing of the thermostat of the cooling device of the hybrid vehicle by the 5th modification of this embodiment.

Explanation of symbols

10 Cooling device for hybrid vehicle 14 PDU (motor control means)
22 Radiator (Temperature setting means, Radiator)
22a Main channel (channel)
22b Subchannel (channel)
23 1st thermostat (temperature setting means, thermostat)
24 Second thermostat (temperature setting means, thermostat)
30a 1st flow path (cooling circuit, circulation flow path)
30b Second flow path (cooling circuit, circulation flow path)
30c 3rd flow path (cooling circuit, circulation flow path)
30d Fourth flow path (cooling circuit, circulation flow path)
30e 5th flow path (cooling circuit, supply flow path)
30f 6th flow path (cooling circuit, circulation flow path)
30g Seventh flow path (cooling circuit, first flow path)
30h 8th flow path (cooling circuit, 2nd flow path)
30j Bypass channel 30k Bypass channel

Claims (8)

A motor having an output shaft mechanically connected to an output shaft of the internal combustion engine, a motor control unit that controls an operating state of the motor, a motor drive source that is a vehicle drive source together with the internal combustion engine, the internal combustion engine, and the motor control A cooling device for a hybrid vehicle comprising: a cooling circuit for cooling means with a common cooling water; and a water pump driven by the internal combustion engine to circulate the cooling water in the cooling circuit ,
A plurality of flow paths that form a radiator that dissipates heat from the cooling water and have different flow paths for the cooling water;
By allowing the cooling water to flow through each of the plurality of flow paths, a management temperature set for the cooling water for cooling the internal combustion engine and a setting for the cooling water for cooling the motor control means are set. Temperature setting means for setting the management temperature to different temperatures ,
The plurality of flow paths include a first flow path through which the cooling water for cooling the internal combustion engine flows, and a shunt cooling water formed by dividing a part of the cooling water that has flowed through the first flow path. A second flow path that circulates,
The first flow path is connected to the cooling circuit of the internal combustion engine, and the cooling water flowing only through the first flow path is directly supplied to the cooling circuit of the internal combustion engine,
The second flow path is connected to the cooling circuit of the motor control means, and the divided cooling water that has flowed through the second flow path flows upstream of the water pump after flowing through the cooling circuit of the motor control means. The hybrid vehicle cooling device according to claim 1, wherein the cooling water merges only with the cooling water flowing through the first flow path . It has multiple thermostats with different sensitive temperatures,
The hybrid vehicle cooling device according to claim 1, wherein the management temperature is set to different temperatures by the plurality of thermostats . A motor used as a drive source of the vehicle together with the internal combustion engine, and motor control means for controlling the operating state of the motor;
A cooling device for a hybrid vehicle comprising a cooling circuit for cooling the internal combustion engine and the motor control means with a common cooling water,
Temperature setting means for setting a management temperature set for the cooling water for cooling the internal combustion engine and a management temperature set for the cooling water for cooling the motor control means to be different from each other; ,
A circulation passage comprising a water jacket provided inside the internal combustion engine, and a water pump for circulating the cooling water to the water jacket;
A radiator comprising a plurality of flow paths having different flow paths for the cooling water;
A supply flow path that branches off from the circulation flow path at a position downstream of the water jacket and distributes the cooling water to the radiator;
A first flow path for flowing the cooling water from the radiator to the circulation flow path through a first thermostat set at a relatively high sensitive temperature;
A second flow path for flowing the cooling water from the radiator to the circulation flow path through a second thermostat set at a relatively low sensitive temperature, and supplying the cooling water to the motor control means;
A bypass flow path connecting the supply flow path and a position of the second flow path downstream of the second thermostat;
A cooling device for a hybrid vehicle, comprising: The cooling apparatus for a hybrid vehicle according to claim 3, wherein the second thermostat is disposed at a position downstream of the motor control means . Placing the motor at a position downstream of the motor control means in the second flow path;
The hybrid vehicle cooling device according to claim 4, wherein the second thermostat is disposed at a position between the motor control unit and the motor and the bypass flow path is connected . 4. The hybrid vehicle cooling apparatus according to claim 3, wherein the second thermostat is disposed at a position upstream of the motor control means . A motor used as a drive source of the vehicle together with the internal combustion engine, and motor control means for controlling the operating state of the motor;
A cooling device for a hybrid vehicle comprising a cooling circuit for cooling the internal combustion engine and the motor control means with a common cooling water,
Temperature setting means for setting a management temperature set for the cooling water for cooling the internal combustion engine and a management temperature set for the cooling water for cooling the motor control means to be different from each other; ,
A circulation passage comprising a water jacket provided inside the internal combustion engine, and a water pump for circulating the cooling water to the water jacket;
A radiator comprising a plurality of flow paths having different flow paths for the cooling water;
A supply flow path that branches off from the circulation flow path at a position downstream of the water jacket and distributes the cooling water to the radiator;
A first flow path for flowing the cooling water from the radiator to the circulation flow path through a first thermostat set at a relatively high sensitive temperature;
A second flow path for flowing the cooling water from the radiator to the circulation flow path through a second thermostat set at a relatively low sensitive temperature, and supplying the cooling water to the motor control means;
A bypass flow path connecting a position between the water pump and the water jacket on the upstream side of the water jacket of the circulation flow path and a position of the second flow path on the downstream side of the second thermostat;
A cooling device for a hybrid vehicle, comprising: A motor used as a drive source of the vehicle together with the internal combustion engine, and motor control means for controlling the operating state of the motor;
A cooling device for a hybrid vehicle comprising a cooling circuit for cooling the internal combustion engine and the motor control means with a common cooling water,
Temperature setting means for setting a management temperature set for the cooling water for cooling the internal combustion engine and a management temperature set for the cooling water for cooling the motor control means to be different from each other; ,
A circulation passage comprising a water jacket provided inside the internal combustion engine, and a water pump for circulating the cooling water to the water jacket;
A radiator comprising a plurality of flow paths having different flow paths for the cooling water;
A supply flow path that branches off from the circulation flow path at a position downstream of the water jacket and distributes the cooling water to the radiator;
A first flow path for flowing the cooling water from the radiator to the circulation flow path through a first thermostat set at a relatively high sensitive temperature;
A second flow path for flowing the cooling water from the radiator to the circulation flow path via a second thermostat having a relatively low sensitive temperature and supplying the cooling water to the motor control means. ,
A cooling device for a hybrid vehicle, wherein the second thermostat is disposed in the circulation passage .

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