Low-temperature cooling system of extended-range hybrid electric vehicle and extended-range hybrid electric vehicle

Abstract

The utility model discloses a low-temperature cooling system of an extended-range hybrid power automobile and the extended-range hybrid power automobile, the low-temperature cooling system of the extended-range hybrid power automobile comprises an electric drive and intercooling pressurization cooling circulation loop and a generator oil cooler cooling circulation loop, and the two cooling circulation loops share one water storage pot; the generator oil cooler cooling circulation loop comprises a first electronic water pump, a generator oil cooler and a generator oil cooling radiator, a water inlet of the first electronic water pump is communicated with a water outlet of the water storage pot and a water outlet of the generator oil cooling radiator, and a water outlet of the first electronic water pump is communicated with a water inlet of the generator oil cooler. And the water outlet of the generator oil cooler is communicated with the water inlet of the generator oil cooling radiator. According to the utility model, all parts in the engine room of the hybrid power automobile can be ensured to be at proper working temperature, so that the hybrid power automobile has good dynamic property under the high-temperature condition.

Description

Technical Field

[0001] The utility model belongs to the technical field of hybrid vehicle thermal management, and in particular relates to a low-temperature cooling system of an extended-range hybrid vehicle and the extended-range hybrid vehicle. Background Art

[0002] Compared with pure electric vehicles, extended-range hybrid vehicles have added power sources, and the thermal management system has become more complex. There are more components that need to be cooled, and the coolant temperature requirements of each component are inconsistent. For example: the power battery coolant temperature is required to be no higher than 40°C, the drive motor assembly, power supply system, and motor controller water temperature is required to be no higher than 65°C, the water-cooled intercooler water temperature is required to be no higher than 60°C, the generator oil cooler water temperature is required to be no higher than 88°C, and the engine coolant water temperature is required to be no higher than 118°C. In order to ensure that each component is in the appropriate temperature range under different working conditions, it is necessary to perform thermal management on each component to achieve reliable and stable output of the power system.

[0003] CN113459764A discloses a thermal management system for a range-extended hybrid vehicle and a control method thereof, which includes an engine cooling water circuit, a heating water circuit, a motor cooling oil circuit, an air conditioning refrigeration circuit, and a battery cooling water circuit, which cool the engine, motor, air conditioning, and battery respectively. However, the motor is cooled by exchanging heat between the oil and the engine high-temperature cooling water before cooling the motor. Under high-temperature power feeding conditions, when the water temperature is as high as 100°C, the motor is prone to overheating, and the motor is forced to limit the output torque, resulting in insufficient power of the entire vehicle. Utility Model Content

[0004] The purpose of the utility model is to provide a low-temperature cooling system for a range-extended hybrid vehicle and a range-extended hybrid vehicle, so as to ensure that all components in the engine compartment of the hybrid vehicle are at a suitable operating temperature, so that the hybrid vehicle has good power performance under high temperature conditions.

[0005] In the first aspect, the low-temperature cooling system of the extended-range hybrid vehicle provided by the utility model includes an electric drive and intercooler supercharger cooling circulation loop and a generator oil cooler cooling circulation loop, and the two cooling circulation loops (i.e., the electric drive and intercooler supercharger cooling circulation loop and the generator oil cooler cooling circulation loop) share a water storage pot. The generator oil cooler cooling circulation loop includes a first electronic water pump, a generator oil cooler and a generator oil cooling radiator, the water inlet of the first electronic water pump is connected to the water outlet of the water storage pot and the water outlet of the generator oil cooling radiator, the water outlet of the first electronic water pump is connected to the water inlet of the generator oil cooler, and the water outlet of the generator oil cooler is connected to the water inlet of the generator oil cooling radiator.

[0006] Preferably, the electric drive and intercooler supercharger cooling circulation loop includes a second electronic water pump, a proportional valve, an electric drive cooling branch, a supercharger, a water-cooled intercooler and a low-temperature radiator. The water-cooled intercooler is connected in parallel with the supercharger. The water inlet of the second electronic water pump is connected with the water outlet of the water reservoir and the water outlet of the low-temperature radiator. The water outlet of the second electronic water pump is connected with the water inlet of the electric drive cooling branch and the water inlet of the proportional valve. The water outlet of the proportional valve is connected with the water inlet of the water-cooled intercooler and the water inlet of the supercharger. The water outlet of the water-cooled intercooler, the water outlet of the supercharger and the water outlet of the electric drive cooling branch are connected with the water inlet of the low-temperature radiator.

[0007] Preferably, the electric drive cooling branch includes a front drive motor, a power supply system, a dual electric control and a rear drive motor, the water inlet of the front drive motor (serving as the water inlet of the electric drive cooling branch) is connected to the water outlet of the second electronic water pump, the water outlet of the front drive motor is connected to the water inlet of the power supply system, the water outlet of the power supply system is connected to the water inlet of the dual electric control, the water outlet of the dual electric control is connected to the water inlet of the rear drive motor, and the water outlet of the rear drive motor (serving as the water outlet of the electric drive cooling branch) is connected to the water inlet of the low-temperature radiator.

[0008] Preferably, the low-temperature radiator is arranged between the grille and the generator oil-cooling radiator, that is, the low-temperature radiator is front-placed, and the low-temperature radiator is arranged behind the grille and in front of the generator oil-cooling radiator.

[0009] Preferably, the generator oil cooling radiator is located in front of the high temperature radiator and the electronic fan. When the electronic fan is working, the generator oil cooling radiator has a better heat dissipation effect.

[0010] Preferably, the overflow port of the low-temperature radiator is connected to the water storage pot through a first one-way valve.

[0011] Preferably, the overflow port of the generator oil-cooling radiator is connected to the water storage pot through a second one-way valve.

[0012] In a second aspect, the utility model provides an extended-range hybrid vehicle, comprising the above-mentioned low-temperature cooling system of the extended-range hybrid vehicle.

[0013] Compared with the prior art, the utility model has the following effects:

[0014] (1) The electric drive, supercharger, and water-cooled intercooler share a cooling loop, while the generator oil cooler uses a separate cooling loop. The generator is cooled by heat exchange between oil and water. The generator water temperature can be effectively controlled within a reasonable range. Low water temperature can effectively reduce the generator oil temperature, thereby ensuring that the generator temperature does not exceed the temperature and that high-temperature torque limitation does not occur. This ensures that all components in the hybrid vehicle cabin are at a suitable operating temperature, allowing the hybrid vehicle to have good power performance under high-temperature conditions.

[0015] (2) A proportional valve is added to the electric drive and intercooler supercharger cooling circulation loop. When the engine is not running in EV mode (i.e. pure electric mode), the water-cooled intercooler and supercharger do not need to be cooled. The opening of the proportional valve is adjusted to cut off the intercooler supercharger branch (i.e. the branch composed of the water-cooled intercooler and the supercharger in parallel). The flow demand of the second electronic water pump becomes smaller, and the duty cycle of the second electronic water pump can be appropriately reduced, thereby reducing the energy consumption of the second electronic water pump. In HEV mode (i.e. hybrid mode), the opening of the proportional valve can be adjusted to control the flow distribution ratio between the electric drive cooling branch and the intercooler supercharger branch.

[0016] (3) The low-temperature radiator is placed in front, and the air inlet temperature is low, which improves the heat exchange efficiency of the low-temperature radiator and reduces the water temperature of the electric drive and intercooler supercharger cooling circulation loop. On the one hand, it effectively reduces the outlet temperature of the water-cooled intercooler to avoid engine knocking. On the other hand, the outlet water temperature of the low-temperature radiator is low and directly enters the electric drive cooling branch for cooling. Even if there are many heating components in the electric drive cooling branch, the front drive motor only serves as an auxiliary drive and generates little heat. The heat generated by the motor controller (corresponding to the dual electronic control) and the power supply system will not produce a large temperature difference. The water temperature entering the rear drive motor is still not high, which improves the cooling effect of the rear drive motor and ensures that the front and rear drive motors can operate within a suitable temperature range even under heat damage conditions, so that the hybrid vehicle has good power under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the low-temperature cooling system of the extended-range hybrid vehicle in the embodiment of the utility model.

[0018] Figure 2 Schematic diagram of coolant flow under HEV conditions in an embodiment of the present utility model.

[0019] Figure 3 Schematic diagram of the coolant flow under EV conditions in an embodiment of the present utility model.

[0020] In the figure, 1-first electronic water pump, 2-proportional valve, 3-front drive motor, 4-power supply system, 5-dual electronic control, 6-rear drive motor, 7-supercharger, 8-water-cooled intercooler, 9-low-temperature radiator, 10-second electronic water pump, 11-generator oil-cooled radiator, 12-generator oil cooler, 13-water storage pot, 14-first one-way valve, 15-second one-way valve, 16-high-temperature radiator, 17-electronic fan. DETAILED DESCRIPTION

[0021] In order to more thoroughly understand the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0023] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0024] It should also be pointed out that the terms "first\second" involved in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0025] like Figure 1 As shown, the low-temperature cooling system of the extended-range hybrid vehicle in the embodiment of the utility model includes an electric drive and intercooler supercharger cooling circulation loop and a generator oil cooler cooling circulation loop, and the two cooling circulation loops (i.e., the electric drive and intercooler supercharger cooling circulation loop and the generator oil cooler cooling circulation loop) share a water storage pot 13.

[0026] The generator oil cooler cooling circulation loop includes a first electronic water pump 1, a generator oil cooler 12, a generator oil cooling radiator 11 and a second one-way valve 15. The water inlet of the first electronic water pump 1 is connected to the water outlet of the water storage pot 13 and the water outlet of the generator oil cooling radiator 11. The water outlet of the first electronic water pump 1 is connected to the water inlet of the generator oil cooler 12. The water outlet of the generator oil cooler 12 is connected to the water inlet of the generator oil cooling radiator 11. The overflow port of the generator oil cooling radiator 11 is connected to the water storage pot 13 through the second one-way valve 15.

[0027] The electric drive and intercooler supercharger cooling circulation loop includes a second electronic water pump 10, a proportional valve 2, an electric drive cooling branch, a supercharger 7, a water-cooled intercooler 8, a low-temperature radiator 9 and a first one-way valve 14. The water-cooled intercooler 8 is connected in parallel with the supercharger 7. The water inlet of the second electronic water pump 10 is connected to the water outlet of the water storage pot 13 and the water outlet of the low-temperature radiator 9. The water outlet of the second electronic water pump 10 is connected to the water inlet of the electric drive cooling branch and the water inlet of the proportional valve 2. The water outlet of the proportional valve 2 is connected to the water inlet of the water-cooled intercooler 8 and the water inlet of the supercharger 7. The water outlet of the water-cooled intercooler 8, the water outlet of the supercharger 7 and the water outlet of the electric drive cooling branch are connected to the water inlet of the low-temperature radiator 9. The overflow port of the low-temperature radiator 9 is connected to the water storage pot 13 through the first one-way valve 14. In some embodiments, the electric drive cooling branch includes a front drive motor 3, a power supply system 4, a dual electric control 5 and a rear drive motor 6, the water inlet of the front drive motor 3 (serving as the water inlet of the electric drive cooling branch) is connected to the water outlet of the second electronic water pump 10, the water outlet of the front drive motor 3 is connected to the water inlet of the power supply system 4, the water outlet of the power supply system 4 is connected to the water inlet of the dual electric control 5, the water outlet of the dual electric control 5 is connected to the water inlet of the rear drive motor 6, and the water outlet of the rear drive motor 6 (serving as the water outlet of the electric drive cooling branch) is connected to the water inlet of the low-temperature radiator 9.

[0028] In some embodiments, the low-temperature radiator 9 is arranged between the grille and the generator oil cooling radiator 11, that is, the low-temperature radiator 9 is arranged in front, and the low-temperature radiator 9 is arranged behind the grille and in front of the generator oil cooling radiator 11. The low-temperature radiator 9 is arranged in front, and the air inlet temperature is low, which can improve the heat exchange efficiency of the low-temperature radiator and reduce the water temperature of the electric drive and intercooler supercharger cooling circulation loop.

[0029] In some embodiments, the generator oil cooling radiator 11 is located in front of the high temperature radiator 16 and the electronic fan 17. When the electronic fan 17 is working, the heat dissipation effect of the generator oil cooling radiator is better.

[0030] like Figure 2As shown, under HEV working conditions, the coolant flows out of the water outlet of the water storage pot 13 in two ways, one way flows to the water inlet of the first electronic water pump 1, and the other way flows to the water inlet of the second electronic water pump 10. The proportional valve 2 is opened, and the coolant flowing to the water inlet of the second electronic water pump 10 flows into the supercharger 7 and the water-cooled intercooler 8 through the second electronic water pump 10 and the proportional valve 2 to cool the supercharger 7 and the water-cooled intercooler 8; the coolant flows into the front drive motor 3, the power supply system 4, the dual electric control 5, and the rear drive motor 6 in sequence through the second electronic water pump 10 to cool the front drive motor 3, the power supply system 4, the dual electric control 5, and the rear drive motor 6; then the coolant flows into the low-temperature radiator 9 for heat dissipation, and the coolant after heat dissipation flows into the second electronic water pump 10 for circulation. The coolant flowing to the water inlet of the first electronic water pump 1 flows into the generator oil cooler 12 through the first electronic water pump 1 to cool the generator oil cooler 12, and then flows into the generator oil cooling radiator 11 to dissipate heat, and the coolant after heat dissipation flows into the first electronic water pump 1 for circulation. Under this working condition, the opening of the proportional valve 2 can be adjusted to control the flow distribution ratio of the electric drive cooling branch and the intercooling and supercharging branch (i.e., the branch composed of the water-cooled intercooler 8 and the supercharger 7 in parallel).

[0031] like Figure 3 As shown, under EV working condition, the engine and generator do not work, only the electric drive cooling branch is running, the supercharger 7 and the water-cooled intercooler 8 do not work, the proportional valve 2 is closed, and the coolant only flows into the front drive motor 3, the power supply system 4, the dual electric control 5, and the rear drive motor 6 in sequence through the second electronic water pump 10 to cool the front drive motor 3, the power supply system 4, the dual electric control 5, and the rear drive motor 6, and then the coolant flows into the low-temperature radiator 9 for heat dissipation, and the coolant after heat dissipation flows into the second electronic water pump 10 for circulation. The cooling circulation loop of the generator oil cooler and the intercooler supercharger branch are stopped.

[0032] An embodiment of the utility model further provides an extended-range hybrid vehicle, which includes the above-mentioned low-temperature cooling system.

[0033] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A low temperature cooling system for an extended range hybrid vehicle, characterized in that: It comprises an electric drive and intercooler supercharger cooling circulation loop and a generator oil cooler cooling circulation loop, and the two cooling circulation loops share a water storage pot (13); the generator oil cooler cooling circulation loop comprises a first electronic water pump (1), a generator oil cooler (12) and a generator oil cooling radiator (11); the water inlet of the first electronic water pump (1) is connected to the water outlet of the water storage pot (13) and the water outlet of the generator oil cooling radiator (11); the water outlet of the first electronic water pump (1) is connected to the water inlet of the generator oil cooler (12); and the water outlet of the generator oil cooler (12) is connected to the water inlet of the generator oil cooling radiator (11).

2. The low temperature cooling system for the extended range hybrid vehicle according to claim 1, characterized in that: The electric drive and intercooler supercharger cooling circulation loop comprises a second electronic water pump (10), a proportional valve (2), an electric drive cooling branch, a supercharger (7), a water-cooled intercooler (8) and a low-temperature radiator (9); the water inlet of the second electronic water pump (10) is connected to the water outlet of the water storage pot (13) and the water outlet of the low-temperature radiator (9); the water outlet of the second electronic water pump (10) is connected to the water inlet of the electric drive cooling branch and the water inlet of the proportional valve (2); the water outlet of the proportional valve (2) is connected to the water inlet of the water-cooled intercooler (8) and the water inlet of the supercharger (7); the water outlet of the water-cooled intercooler (8), the water outlet of the supercharger (7) and the water outlet of the electric drive cooling branch are connected to the water inlet of the low-temperature radiator (9).

3. The low temperature cooling system for the extended range hybrid vehicle according to claim 2, characterized in that: The electric drive cooling branch comprises a front drive motor (3), a power supply system (4), a dual electric control (5) and a rear drive motor (6); a water inlet of the front drive motor (3) is connected to a water outlet of a second electronic water pump (10); a water outlet of the front drive motor (3) is connected to a water inlet of the power supply system (4); a water outlet of the power supply system (4) is connected to a water inlet of the dual electric control (5); a water outlet of the dual electric control (5) is connected to a water inlet of the rear drive motor (6); and a water outlet of the rear drive motor (6) is connected to a water inlet of a low-temperature radiator (9).

4. The low temperature cooling system for the extended range hybrid vehicle according to claim 2 or 3, characterized in that: The low-temperature radiator (9) is arranged between the grille and the generator oil cooling radiator (11).

5. The low temperature cooling system for the extended range hybrid vehicle according to claim 4, characterized in that: The generator oil cooling radiator (11) is located in front of the high-temperature radiator (16) and the electronic fan (17).

6. The low temperature cooling system for the extended range hybrid vehicle according to claim 4, characterized in that: The overflow port of the low-temperature radiator (9) is connected to the water storage pot (13) via a first one-way valve (14).

7. The low temperature cooling system for the extended range hybrid vehicle according to claim 4, characterized in that: The overflow port of the generator oil cooling radiator (11) is connected to the water storage pot (13) via a second one-way valve (15).

8. An extended-range hybrid vehicle, characterized in that: Comprising a low temperature cooling system as claimed in any one of claims 1 to 7.

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