Thermal management system of extended-range hybrid vehicle and vehicle

Abstract

The invention relates to a thermal management system of an extended-range hybrid vehicle and the vehicle. The thermal management system comprises an engine system high-temperature cooling loop, a hub motor system low-temperature cooling loop and a generator system low-temperature cooling loop which are mutually independent. According to different heat dissipation requirements of an engine, a generator, a hub motor, various controllers, batteries and the like, heat dissipation can be conducted according to blocks and needs, energy consumption is reduced through engine waste heat recovery, the driving mileage is increased, the problem that heat dissipation is insufficient in a hub motor driving mode is solved, and the service life of the hub motor is prolonged. And the heat dissipation and energy utilization efficiency of the thermal management system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicle manufacturing technology, and particularly relates to a thermal management system of a range-extending hybrid vehicle and the vehicle. BACKGROUND

[0002] The common electric drive types of existing new energy commercial vehicles include central drive, electric drive axle and distributed wheel hub motor drive. The distributed wheel hub motor drive is more mobile and more efficient, but its arrangement space and thermal management are more complex, and the application is less. The thermal management system of the current most range-extending vehicles serially cools all electric drive components. In the range-extending vehicle of the multi-axle wheel hub motor drive form, the heat dissipation is insufficient, which reduces the reliability of the thermal management system. In addition, there is no engine waste heat recovery in the thermal management system, which is not conducive to improving energy utilization. SUMMARY

[0003] The present application aims at the deficiencies of the prior art and provides a thermal management system of a range-extending hybrid vehicle and the vehicle, which solves the problems of overheating of the elements at the rear in a single serial cooling loop, increased energy consumption and shortened service life when the wheel hub motor or the controller is increased in the thermal management system of the range-extending hybrid vehicle.

[0004] The present application is implemented by using the following technical scheme:

[0005] A thermal management system of a range-extending hybrid vehicle, comprising a high-temperature cooling loop of an engine system, a low-temperature cooling loop of a wheel hub motor system and a low-temperature cooling loop of a generator system which are independent of each other.

[0006] The high-temperature cooling loop of the engine system comprises a high-temperature radiator, an engine and a high-temperature expansion water kettle which are connected by a cooling liquid pipeline.

[0007] The low-temperature cooling loop of the wheel hub motor system comprises a first low-temperature radiator, a first temperature sensor, a first water pump, a wheel hub motor and a wheel hub motor controller which are connected by a cooling liquid pipeline.

[0008] The low-temperature cooling loop of the generator system comprises a second low-temperature radiator, a second temperature sensor, a second water pump, a four-in-one controller, a generator controller and a range-extending generator which are connected by a cooling liquid pipeline.

[0009] As a further description of the application, an air conditioning cooling loop is further included. The air conditioning cooling loop comprises a heat exchanger, an electric compressor, a condenser, a fan, a liquid storage drying tank and an expansion valve which are connected by a refrigerant pipeline.

[0010] As further description of the application, the power battery cooling circuit is further included; the air conditioner cooling circuit and the power battery cooling circuit share the same heat exchanger; the power battery cooling circuit comprises the heat exchanger, the third temperature sensor, the power battery module, the battery expansion kettle and the third water pump connected by the cooling liquid pipeline.

[0011] As further description of the application, the electromagnetic valve and the fan are connected between the high-temperature radiator inlet and outlet of the engine system high-temperature cooling circuit.

[0012] As further description of the application, the heat exchanger is provided with three groups of inlets and outlets, the first group of inlets and outlets is connected with the air conditioner cooling circuit, the second group of inlets and outlets is connected with the power battery cooling circuit, and the third group of inlets and outlets is connected with the engine system high-temperature cooling circuit.

[0013] As further description of the application, the third group of inlets and outlets of the heat exchanger is provided with the first thermostat and the second thermostat, respectively, and the first thermostat and the second thermostat are connected with the high-temperature radiator of the engine system high-temperature cooling circuit, thereby forming the engine preheating recovery circuit.

[0014] As further description of the application, the low-temperature expansion kettle is further included; the low-temperature expansion kettle is provided in two and is connected in parallel, and the two inlets and outlets are connected with the first low-temperature radiator and the second low-temperature radiator, respectively.

[0015] A vehicle comprises the thermal management system of the extended-range hybrid vehicle as described in any of the above.

[0016] Compared with the prior art, the application has the following beneficial technical effects:

[0017] The application can perform block and on-demand heat dissipation according to different heat dissipation requirements of the engine, the generator, the hub motor, various controllers, the battery and the like, increase the heat dissipation efficiency and reliability of the whole system by reducing the setting of elements such as the heat exchanger and the electromagnetic valve, make the elements in the system work in a suitable temperature range, reduce the energy consumption, increase the cruising range, heat the battery by using the engine waste heat recovery, adjust the cooling liquid temperature of the elements in the system and the circuits in the system according to the actual working conditions, effectively improve the efficiency of the whole thermal management system, realize the overall management of the vehicle heat, optimize the heat transfer sequence, and improve the environmental protection performance and energy saving effect of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The application provides an extended-range hybrid vehicle thermal management system principle schematic diagram;

[0019] Figure 2 The application provides an engine system high-temperature cooling circuit structure schematic diagram;

[0020] Figure 3 A hub motor system low-temperature cooling circuit structure schematic diagram provided for an embodiment of the present application;

[0021] Figure 4 A generator system low-temperature cooling circuit structure schematic diagram provided for an embodiment of the present application;

[0022] Figure 5 An air conditioner cooling circuit and a power battery cooling circuit schematic diagram provided for an embodiment of the present application;

[0023] Figure 6 An engine waste heat recovery circuit schematic diagram provided for an embodiment of the present application.

[0024] In the figure, 1, engine; 2, high-temperature expansion water pot; 3, fan; 4, electromagnetic valve; 5, high-temperature radiator; 6, low-temperature expansion water pot; 7, second temperature sensor; 8, second water pump; 9, four-in-one controller; 10, generator controller; 11, range-extender generator; 12, second low-temperature radiator; 13, first low-temperature radiator; 14, hub motor; 15, hub motor controller; 16, first water pump; 17, first temperature sensor; 18, expansion valve; 19, liquid storage and drying tank; 20, condenser; 21, fan; 22, electric compressor; 23, heat exchanger; 24, third temperature sensor; 25, power battery module; 26, battery expansion water pot; 27, third water pump; 28, first thermostat; 29, second thermostat. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] Embodiment 1

[0027] As Figures 1-6 shown, the present application provides a range-extender hybrid vehicle thermal management system, comprising, comprising a high-temperature cooling circuit of an engine system, a low-temperature cooling circuit of a hub motor system, and a low-temperature cooling circuit of a generator system which are independent of each other;

[0028] The high-temperature cooling circuit of the engine system comprises a high-temperature radiator 5, an engine 1 and a high-temperature expansion water pot 2 connected by a cooling liquid pipeline; the high-temperature cooling circuit of the engine system is used for cooling the engine system;

[0029] The hub motor system low-temperature cooling circuit comprises a first low-temperature radiator 13, a first temperature sensor 17, a first water pump 16, a hub motor 14 and a hub motor controller 15 connected by cooling liquid pipelines; the hub motor system low-temperature cooling circuit is used for cooling the hub motor 14 and the hub motor controller 15;

[0030] The generator system low-temperature cooling circuit comprises a second low-temperature radiator 12, a second temperature sensor 7, a second water pump 8, a four-in-one controller 9, a generator controller 10 and an extended-range generator 11 connected by cooling liquid pipelines; the generator system low-temperature cooling circuit is used for cooling the four-in-one controller 9, the generator controller 10 and the extended-range generator 11;

[0031] Considering the heat dissipation capacity and the arrangement of space, the engine has the largest heat generation in the heat management system elements, and therefore a high-temperature cooling circuit is separately arranged to cool the engine; in addition to the engine, the remaining elements cannot be cooled by one low-temperature cooling circuit under the condition of meeting the heat dissipation demand, and therefore the low-temperature cooling circuit is arranged as two; the two low-temperature circuits are independent of each other, and the cooling liquid only needs to cool the elements in the corresponding circuit, the cooling effect is good, and the time required for cooling to the appropriate temperature is shortened.

[0032] Further, the air conditioning cooling circuit is further included; the air conditioning cooling circuit comprises a heat exchanger 23, an electric compressor 22, a condenser 20, a fan 21, a liquid storage drying tank 19 and an expansion valve 18 connected by refrigerant pipelines; the air conditioning cooling circuit is used for cooling the passenger cabin and the power battery.

[0033] Further, the power battery cooling circuit is further included; the air conditioning cooling circuit and the power battery cooling circuit share the same heat exchanger; the power battery cooling circuit comprises the heat exchanger 23, a third temperature sensor 24, a power battery module 25, a battery expansion kettle 26 and a third water pump 27 connected by cooling liquid pipelines; the power battery cooling circuit is used for cooling the battery cooling circuit.

[0034] Further, the inlet and outlet of the high-temperature radiator 5 of the engine system high-temperature cooling circuit are respectively connected with the electromagnetic valve 4 and the fan 3 through the three-way joint, the on-off of the electromagnetic valve 4 can be controlled according to the demand, and the heat of the engine is transmitted to the cab in the circuit for the warm air adjustment of the cab.

[0035] Further, on the basis that the air conditioning cooling circuit and the power battery cooling circuit share the same heat exchanger, the engine system high-temperature cooling circuit shares one heat exchanger with the other two circuits; specifically comprising:

[0036] The heat exchanger 23 has three groups of inlets and outlets, the first group of inlets and outlets is connected with the air conditioner cooling circuit, the second group of inlets and outlets is connected with the power battery cooling circuit, and the third group of inlets and outlets is connected with the engine system high-temperature cooling circuit; by reducing the setting of the heat exchanger, the electromagnetic valve and other elements, the heat dissipation efficiency and the reliability of the whole system are increased, the elements in the system work in the appropriate temperature range, the energy consumption is reduced, and the cruising range is increased.

[0037] Further, the third group of inlets and outlets of the heat exchanger 23 is provided with a first thermostat 28 and a second thermostat 29, respectively, the first thermostat 28 and the second thermostat 29 are connected with the high-temperature radiator 5 of the engine system high-temperature cooling circuit, and form an engine preheating recovery circuit; when the power battery needs to be heated, the thermostat controls its on-off and opening degree through the ambient temperature, when the temperature is lower than the corresponding preset value, the first thermostat 28 and the second thermostat 29 at the third inlet and outlet are opened, and the excess heat of the engine is transmitted to the battery coolant through the heat exchanger 23, when the temperature is higher than the corresponding preset value, the first thermostat 28 and the second thermostat 29 are closed, in the case that the ambient temperature is low, when the power battery needs to be heated, the engine waste heat recovery method can be used to transmit the heat of the engine to the battery coolant in the heat exchanger 23, so that the purpose of heating the battery is achieved, compared with using PTC to heat the battery alone, the energy consumption is reduced, and the energy utilization rate is improved.

[0038] Further, on the basis of separately setting the wheel hub motor system low-temperature cooling circuit and the generator system low-temperature cooling circuit, a low-temperature expansion water pot is further included, the low-temperature expansion water pot 6 is two in number and is connected in parallel, and two inlets and outlets are connected with the first low-temperature radiator 13 and the second low-temperature radiator 12, respectively; the wheel hub motor system low-temperature cooling circuit and the generator system low-temperature cooling circuit are respectively provided with cooling temperature elements with appropriate temperatures close to each other, which is conducive to full cooling when the wheel hub motor or the motor controller is increased, and the two low-temperature expansion water pots 6 are conducive to independent temperature control. Each cooling circuit is independent of each other, and the coolant only needs to cool the elements in the corresponding circuit, the cooling effect is good, the time required for cooling to the appropriate temperature is shortened, and reducing the number of electric control valves in the thermal management system is conducive to increasing the reliability of the system.

[0039] Further, in order to solve the problem of limited space arrangement, the high-temperature radiator 5, the first low-temperature radiator 13 and the second low-temperature radiator 12 are packaged together, each radiator has its own upper and lower water chambers, and is separated from each other by frame sponge strips and the like, and the engine fan and the electronic fan are used to cool each element.

[0040] As Figure 1 , 3, 4, 5, the first water pump 16, the second water pump 8, the third water pump 27 in the hub motor system low-temperature cooling circuit, the generator system low-temperature cooling circuit, the power battery cooling circuit are used for adjusting the flow of the coolant in the circuit respectively.

[0041] As shown in Figure 1 、 3 , 4, 5, the first temperature sensor 17, the second temperature sensor 7 and the third temperature sensor 24 in the hub motor system low-temperature cooling circuit, the generator system low-temperature cooling circuit, the power battery cooling circuit are used for real-time monitoring the temperature of the coolant in the circuit respectively, and the temperature signal is transmitted to the corresponding water pump. Each temperature sensor has a corresponding preset value according to the suitable temperature of the element to be cooled in the circuit. When the temperature is greater than or equal to the corresponding preset value, the signal is fed back to the corresponding water pump in the circuit, and the temperature in the circuit is controlled in the suitable working temperature range.

[0042] When the detection value of the first temperature sensor 17 in the hub motor system low-temperature cooling circuit is greater than or equal to the corresponding preset value, or the first temperature sensor 17 is lower than the corresponding preset value, the first water pump 16 is driven to increase or decrease the speed, so that the temperature of the coolant in the hub motor system low-temperature cooling circuit is always maintained in the suitable temperature range of each element in the circuit. Similarly, the second temperature sensor 7 in the generator system low-temperature cooling circuit can also be set in this way.

[0043] The third temperature sensor 24 in the power battery cooling circuit collects the temperature signal of the coolant in the power battery cooling circuit in real time. When the power battery module 25 needs to be cooled, the power battery cooling circuit and the air conditioning cooling circuit exchange heat through the heat exchanger 23 to cool the power battery 25. The main function of the heat exchanger 23 is to use the air conditioning refrigeration system to cool the high-temperature coolant in the power battery cooling circuit. And through the power provided by the third water pump 27, the coolant circulates in the power battery cooling circuit, so as to achieve the purpose of cooling the battery cell.

[0044] Embodiment 2

[0045] A vehicle comprising the thermal management system of the range-extending hybrid vehicle of any one of the above, which is not described again.

[0046] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thermal management system of a range extended hybrid vehicle, characterized by, The engine system high-temperature cooling circuit, the wheel hub motor system low-temperature cooling circuit and the generator system low-temperature cooling circuit are independent of each other. The engine system high-temperature cooling circuit comprises a high-temperature radiator, an engine and a high-temperature expansion water pot connected by cooling liquid pipelines. The wheel hub motor system low-temperature cooling circuit comprises a first low-temperature radiator, a first temperature sensor, a first water pump, a wheel hub motor and a wheel hub motor controller connected by cooling liquid pipelines. The generator system low-temperature cooling circuit comprises a second low-temperature radiator, a second temperature sensor, a second water pump, a four-in-one controller, a generator controller and an extended-range generator connected by cooling liquid pipelines.

2. The thermal management system of the range extender hybrid vehicle of claim 1, wherein, The air conditioner cooling circuit comprises a heat exchanger, an electric compressor, a condenser, a fan, a liquid storage drying tank and an expansion valve connected by refrigerant pipelines.

3. The thermal management system of the range extender hybrid vehicle of claim 2, wherein, The power battery cooling circuit shares the same heat exchanger with the air conditioner cooling circuit.

4. The thermal management system of the range extender hybrid vehicle of claim 3, wherein, The power battery cooling circuit comprises a heat exchanger, a third temperature sensor, a power battery module, a battery expansion water pot and a third water pump connected by cooling liquid pipelines.

5. The thermal management system of the range extended hybrid vehicle of claim 4, wherein, An electromagnetic valve and a fan are connected between the high-temperature radiator inlet and outlet of the engine system high-temperature cooling circuit.

6. The thermal management system of the range extended hybrid vehicle of claim 5, wherein, The heat exchanger has three groups of inlets and outlets, the first group of inlets and outlets are connected with the air conditioner cooling circuit, the second group of inlets and outlets are connected with the power battery cooling circuit, and the third group of inlets and outlets are connected with the engine system high-temperature cooling circuit.

7. The thermal management system of the range extended hybrid vehicle of claim 6, wherein, The third group of inlets and outlets of the heat exchanger are respectively provided with a first thermostat and a second thermostat, and the first thermostat and the second thermostat are connected with the high-temperature radiator of the engine system high-temperature cooling circuit to form an engine preheating recovery circuit.

8. A vehicle characterized by comprising: The low-temperature expansion water pot has two parallelly arranged low-temperature expansion water pots, and two inlets and outlets are respectively connected with the first low-temperature radiator and the second low-temperature radiator. The heat management system of the extended-range hybrid vehicle comprises the heat management system of the extended-range hybrid vehicle according to any one of claims 1-7.

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