Integrated thermal management system for hybrid electric vehicle

Abstract

The utility model relates to an integrated thermal management system for a hybrid vehicle, and belongs to the technical field of vehicle thermal management. Comprising a cab heating circulation loop, and the cab heating circulation loop comprises a waste heat branch, a first water pump and a warm air core body which are connected in series. The waste heat branch comprises a first heat exchange branch and a second heat exchange branch; the first heat exchange branch is connected in series with an engine heat exchanger for exchanging heat with an engine; any two of a second heat exchange branch which is connected in series with a motor assembly heat exchanger for exchanging heat with the motor assembly and a third heat exchange branch which is connected in series with a generator assembly heat exchanger for exchanging heat with the generator assembly are combined in parallel or three branches are combined in parallel. According to the utility model, the cab is heated by using the waste heat of any combination of the engine, the motor assembly and the generator assembly, so that the component utilization rate of the conventional heat management system can be improved, and the heating cost of the cab can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to an integrated thermal management system for a hybrid vehicle, belonging to the technical field of vehicle thermal management. Background Art

[0002] Hybrid electric vehicles (HEVs) have unique advantages in terms of market value compared to pure fuel vehicles or pure electric vehicles. On the one hand, hybrid electric vehicles can perform well in daily short-distance travel, while providing reliable use guarantees in long-distance travel, thus helping to solve people's concerns about "range anxiety" and "inconvenience of charging" for electric vehicles. On the other hand, with the increase in the energy density of power batteries and based on considerations of battery life, the vehicle thermal management system needs to provide a comfortable operating temperature for the battery pack.

[0003] In addition, in order to ensure the stable operation and normal performance of the vehicle, the drive motor, generator, engine, controller, etc. also need to be thermally managed. The above goals are all to ensure the mechanical performance of the vehicle, but more importantly, there is also thermal management of the cab environment to ensure that the driver and passengers are in good driving condition.

[0004] At present, the thermal management of hybrid vehicle cab air conditioning, battery thermal management, motor and motor controller, generator and generator controller are basically self-contained systems, independently controlled, or only partially integrated.

[0005] For example, the battery thermal management of hybrid electric vehicles mostly adopts liquid cooling and liquid heating, and the drive motor of the hybrid vehicle adopts forced liquid cooling. The liquid cooling circuit of the battery thermal management and the forced liquid cooling circuit of the drive motor share the condensing fan. The cab thermal management is an independent direct evaporative air conditioning system and wind-heated electric PTC (Positive Temperature Coefficient) heating. This thermal management system is two independent systems, which require 2 compressors and 2 condensers to form a system. The system has a low degree of integration, low component utilization, and relatively high cost.

[0006] With the development of the automotive thermal management industry, the entire vehicle urgently needs a thermal management system with high performance, highly integrated structure and relatively low cost. Utility Model Content

[0007] The utility model aims to provide an integrated thermal management system for a hybrid vehicle, so as to solve the problem of low utilization rate of components of the existing thermal management system.

[0008] To achieve the above purpose, the solution of the utility model includes:

[0009] The utility model discloses an integrated thermal management system for a hybrid vehicle, including a cab heating circulation loop, the cab heating circulation loop including a waste heat branch, a first water pump and a heater core connected in series, the waste heat branch including: a first heat exchange branch connected in series with an engine heat exchanger for exchanging heat with an engine, a second heat exchange branch connected in series with a motor assembly heat exchanger for exchanging heat with a motor assembly, and a third heat exchange branch connected in series with a generator assembly heat exchanger for exchanging heat with a generator assembly, any two of which are connected in parallel or a combination of three branches connected in parallel; the first water pump is used to accelerate the circulation of a coolant in the cab heating circulation loop, and the heater core is used to realize heat exchange between the cab heating circulation loop and the environment inside the cab.

[0010] Furthermore, a radiator is connected in series on the cab heating cycle. The radiator is arranged on a pipeline between the input end of the waste heat branch and the output end of the heater core. The radiator is used to exchange heat with the external environment to dissipate the heat of the coolant output by the heater core.

[0011] Furthermore, the cab heating circulation loop also includes a first heating branch connected in series with a first heater, and the first heating branch and the series-connected waste heat branch are connected in parallel with the radiator.

[0012] Furthermore, the cab heating circulation loop also includes a second heating branch connected in series with a second heater, and the second heating branch is connected in parallel with the waste heat branch.

[0013] Furthermore, it also includes a cab refrigeration cycle circuit, which includes a compressor, a condenser, a first expansion valve and an evaporator core connected in series; the evaporator core is used to realize heat exchange between the cab refrigeration cycle circuit and the environment inside the cab, and the first expansion valve is arranged on the pipeline close to the input side of the evaporator core.

[0014] Furthermore, the heater core and the evaporator core accelerate heat exchange with the cabin environment through the same fan.

[0015] Furthermore, it also includes a battery cooling branch connected in parallel with the first expansion valve and the evaporator core after the series connection, and the battery cooling branch includes a second expansion valve in series and a refrigerant side of a battery heat exchanger used for heat exchange with a battery liquid cooling circulation loop; the second expansion valve is arranged on the pipeline between the output side of the condenser and the input side of the battery heat exchanger, and is arranged close to the input side of the battery heat exchanger.

[0016] Furthermore, the battery liquid cooling circulation loop includes a second water pump in series, a battery pack heat exchanger for exchanging heat with the battery pack, and a liquid cooling side of the battery heat exchanger. The refrigerant side of the battery heat exchanger exchanges heat with its liquid cooling side. The second water pump is used to accelerate the circulation of the coolant in the battery liquid cooling circulation loop.

[0017] Furthermore, the battery liquid cooling circulation loop is also connected in series with a third heater.

[0018] Furthermore, the motor assembly heat exchanger includes a motor heat exchanger and a motor controller heat exchanger, and the generator assembly heat exchanger includes a generator heat exchanger and a generator controller heat exchanger.

[0019] Beneficial effects of the utility model:

[0020] The utility model is a pioneering invention, providing an integrated thermal management system for hybrid vehicles, which can heat the cab by utilizing any combination of waste heat from the engine, motor assembly, and generator assembly, thereby improving the component utilization rate of the existing thermal management system and effectively reducing the cab heating cost. Specifically, the waste heat branch, the first water pump, and the warm air core are connected in series, wherein the waste heat branch includes any two branches in parallel or three branches in parallel among the first heat exchange branch connected in series with the engine heat exchanger, the second heat exchange branch connected in series with the motor assembly heat exchanger, and the third heat exchange branch connected in series with the generator assembly heat exchanger, so as to provide any two or three heat sources from the engine waste heat, the motor assembly waste heat, and the generator assembly waste heat for the warm air core to exchange heat with the cab interior environment, thereby heating the cab; the first water pump is used to accelerate the circulation of the refrigerant in the cab heating circulation loop; and the warm air core is used to realize the heat exchange between the cab heating circulation loop and the cab interior environment. Among them, the engine heat exchanger is used for exchanging heat with the engine, the motor assembly heat exchanger is used for exchanging heat with the motor assembly, and the generator assembly heat exchanger is used for exchanging heat with the generator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an integrated thermal management system according to an embodiment of the utility model;

[0022] Figure 2 It is a working principle diagram of the integrated thermal management system of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to solve the problems in the background technology, the utility model provides an integrated thermal management system for a hybrid vehicle, which heats the cab by utilizing the waste heat of any combination of the engine, motor assembly, and generator assembly, thereby improving the component utilization rate of the existing thermal management system and effectively reducing the cost of heating the cab.

[0024] In order to make the purpose, technical solutions and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] An embodiment of an integrated thermal management system for a hybrid vehicle:

[0026] An integrated thermal management system for a hybrid vehicle comprises a cab heating circulation loop, wherein the cab heating circulation loop comprises a waste heat branch, a first water pump and a heater core connected in series.

[0027] Among them, the waste heat branch includes: a first heat exchange branch connected in series with an engine heat exchanger for exchanging heat with the engine, a second heat exchange branch connected in series with a motor assembly heat exchanger for exchanging heat with the motor assembly, and a third heat exchange branch connected in series with a generator assembly heat exchanger for exchanging heat with the generator assembly, a combination of any two branches in parallel or a combination of three branches in parallel.

[0028] That is, the waste heat branch includes: the first heat exchange branch and the second heat exchange branch in parallel, or the first heat exchange branch and the third heat exchange branch in parallel, or the second heat exchange branch and the third heat exchange branch in parallel, or the first heat exchange branch, the second heat exchange branch and the third heat exchange branch in parallel.

[0029] Among them, the first water pump is used to accelerate the circulation of the refrigerant in the cab heating circulation loop, and the heater core is used to realize the heat exchange between the cab heating circulation loop and the environment inside the cab.

[0030] Specifically, a radiator is also connected in series on the cab heating circulation loop. The radiator is arranged on a pipeline between the input end of the waste heat branch and the output end of the heater core. The radiator is used to exchange heat with the external environment to dissipate the heat of the refrigerant output by the heater core. While the heater core can fully utilize the waste heat of the waste heat branch, it can meet the heat dissipation needs of the components that need heat dissipation on the waste heat branch, thereby preventing the heat carried by the refrigerant output by the heater core from affecting the components that dissipate heat through the waste heat branch.

[0031] Specifically, considering that the waste heat provided by the waste heat branch is difficult to meet the heating demand of the cab, a first heater is added to the cab heating cycle, that is, the cab heating cycle also includes a first heating branch connected in series with the first heater, the waste heat branch is connected in series with the radiator and then in parallel with the first heating branch, and the first heater can be used to supplement the required heat for the warm air core, which not only utilizes the waste heat of the waste heat branch, but also can meet the heating demand of the cab. The first heater can also preheat the components that exchange heat with the waste heat branch in a low temperature environment.

[0032] As another embodiment, the cab heating cycle also includes a second heating branch connected in series with a second heater, the second heating branch is connected in parallel with the waste heat branch, and the second heater can provide heat for the heater core and preheat the components that exchange heat with the waste heat branch.

[0033] Specifically, it also includes a cab refrigeration cycle circuit, which includes a compressor, a condenser, a first expansion valve and an evaporator core connected in series; the evaporator core is used to realize heat exchange between the cab refrigeration cycle circuit and the cab interior environment, and the first expansion valve is arranged on the pipeline close to the input side of the evaporator core. The cab refrigeration cycle is realized by compressor compression, condensation of the condenser, throttling of the first expansion valve and evaporation of the evaporator core. Specifically, the warm air core and the evaporator core accelerate the heat exchange with the cab interior environment through the same fan, improve the utilization rate of the fan, and effectively reduce the space occupation.

[0034] Specifically, it also includes a battery cooling branch. The first expansion valve is connected in series with the evaporator core and then in parallel with the battery cooling branch. The battery cooling branch includes a second expansion valve in series and a refrigerant side of the battery heat exchanger for heat exchange with the battery liquid cooling circulation loop; the second expansion valve is arranged on the pipeline between the output side of the condenser and the input side of the battery heat exchanger, and is arranged close to the input side of the battery heat exchanger. The battery cooling cycle is realized by compressor compression, condensation of the condenser, throttling of the second expansion valve, and evaporation of the refrigerant side of the battery heat exchanger. By sharing the compressor and condenser for battery cooling and cab cooling, the utilization rate of the compressor and condenser is effectively improved, and the space occupancy is effectively reduced.

[0035] Specifically, the battery liquid cooling circulation loop includes a second water pump connected in series, a battery pack heat exchanger for exchanging heat with the battery pack, and a liquid cooling side of the battery heat exchanger. The refrigerant side of the battery heat exchanger exchanges heat with its liquid cooling side. The second water pump is used to accelerate the circulation of the coolant in the battery liquid cooling circulation loop.

[0036] Specifically, the battery liquid cooling circulation loop is also connected in series with a third heater, that is, the second water pump, the battery pack heat exchanger, the liquid cooling side of the battery heat exchanger and the third heater are connected in series, and liquid heat circulation of the battery pack is realized through the third heater.

[0037] Specifically, the motor assembly heat exchanger includes a motor heat exchanger and a motor controller heat exchanger, and the generator assembly heat exchanger includes a generator heat exchanger and a generator controller heat exchanger.

[0038] Specifically, in order to protect the compressor, a gas-liquid separator is also connected in series in the cab refrigeration cycle. The gas-liquid separator is arranged in the pipeline between the input side of the compressor and the output side of the evaporator core, which effectively avoids liquid hammering of the compressor and prevents the compressor from causing "liquid hammer" failure due to the inhalation of excessively wet vapor.

[0039] An integrated thermal management system for a hybrid vehicle, the system is divided into two parts: a coolant circulation system and a refrigerant circulation system. The refrigerant circulation system mainly provides a cold source for cooling batteries and a cab; the coolant circulation system is mainly used to cool parts that need cooling through heat exchange.

[0040] like Figure 1 As shown, the integrated thermal management system mainly includes a high-voltage DC compressor as a compressor, a condensing fan for accelerating the heat exchange between the condenser and the external environment, a condenser, a gas-liquid separator, a first electronic expansion valve as a first expansion valve, an HVAC air conditioning box (HVAC in the figure) as an HVAC (Heating, Ventilation, Air Conditioning and Cooling, heating, ventilation and air conditioning or air conditioning system) assembly, a first water pump, a first expansion water tank, a first liquid PTC as a first heater, an engine heat exchanger (engine in the figure), a motor heat exchanger (motor in the figure), a motor controller heat exchanger (motor controller in the figure), a generator heat exchanger (generator in the figure), a generator controller heat exchanger (generator controller in the figure), a radiator (with a fan), a second electronic expansion valve as a second expansion valve, a battery cooler plate heat exchanger as a battery heat exchanger, a second expansion water tank, a second water pump, a second liquid PTC as a third heater, and a battery pack heat exchanger (battery pack in the figure). Among them, liquid PTC, that is, a liquid PTC heater is a heating device using a positive temperature coefficient thermistor material.

[0041] Among them, the HVAC assembly (HVAC air conditioning box) includes a blower as a fan, an evaporator core and a heater core. Among them, the liquid-cooled side of the battery heat exchanger, the second water pump, the third heater and the battery pack heat exchanger connected in series form a battery liquid cooling circulation loop. A second expansion water tank is also provided on the battery liquid cooling circulation loop to maintain the water balance in the battery liquid cooling circulation loop when the ambient temperature changes. Among them, the first heat exchange branch connected in series with the engine heat exchanger, the second heat exchange branch connected in series with the motor assembly heat exchanger and the third heat exchange branch connected in series with the generator assembly heat exchanger are connected in parallel, or the first heat exchange branch is connected in parallel with the second heat exchange branch, or the first heat exchange branch is connected in parallel with the third heat exchange branch, or the second heat exchange branch is connected in parallel with the third heat exchange branch, or the second heat exchange branch is connected in parallel with the third heat exchange branch to form a waste heat branch.

[0042] The engine heat exchanger is used to realize heat exchange between the waste heat branch and the engine; the motor assembly heat exchanger is used to realize heat exchange between the waste heat branch and the motor assembly; the generator assembly heat exchanger is used to realize heat exchange between the waste heat branch and the generator assembly. The motor assembly includes a motor and a motor controller; the generator assembly includes a generator and a generator controller. The motor assembly heat exchanger includes a motor heat exchanger for heat exchange with the motor and a motor controller heat exchanger for heat exchange with the motor controller; the generator assembly heat exchanger includes a generator heat exchanger for heat exchange with the generator and a generator controller heat exchanger for heat exchange with the generator controller.

[0043] Among them, the motor heat exchanger and the motor controller heat exchanger are connected in series or in parallel as a motor assembly heat exchanger, and the generator heat exchanger and the generator controller heat exchanger are connected in series or in parallel as a generator assembly heat exchanger.

[0044] The series-connected waste heat branch, the first water pump, the heater core and the radiator form a cab heating circulation loop; the radiator is connected in series on the pipeline between the output side of the heater core and the input side of the waste heat branch, and while being able to utilize the waste heat of the waste heat branch to heat the cab, it can also promptly dissipate the heat of the refrigerant on the output side of the heater core, thereby avoiding affecting the components that should be dissipated and are arranged on the waste heat branch.

[0045] The branch after the radiator and the waste heat branch are connected in series is also connected in parallel with the branch connected in series with the first heater, so that when the heat of the waste heat branch is not sufficient for heating the cab, heat can be obtained through the first heater for heating the cab; it can also preheat one or more of the engine, motor, motor controller, generator and generator controller in a low temperature environment.

[0046] A first expansion water tank is also provided in the loop formed by the waste heat branch, the first water pump, the heater core, the radiator, the first heater and the corresponding pipelines to maintain the water balance in the loop.

[0047] The compressor, condenser, first electronic expansion valve, evaporator core and gas-liquid separator connected in series in sequence form an air-conditioning refrigeration circuit (cab refrigeration circuit), and the two ends of the first electronic expansion valve connected in series with the evaporator core and the two ends of the second electronic expansion valve connected in series with the refrigerant side of the battery heat exchanger are connected in parallel.

[0048] The working modes of the integrated thermal management system include cab air conditioning cooling (cab cooling), cab air conditioning heating (cab heating), motor / motor controller cooling and generator / generator controller cooling. The specific working modes are as follows:

[0049] 1) Cab air conditioning refrigeration mode: mainly compression, condensation, throttling and evaporation refrigeration of refrigerant.

[0050] like Figure 2 As shown, after the refrigerant is compressed by the high-voltage DC compressor, the refrigerant is condensed by the condenser under the action of the condensing fan, and then expanded and throttled by the first electronic expansion valve, and then the blower in the HVAC air-conditioning box blows air to accelerate the heat absorption and evaporation of the refrigerant by the evaporator core. The evaporated refrigerant returns to the compressor after passing through the gas-liquid separator to realize the refrigeration cycle of the cab; the evaporator core (evaporation core) is used to transport the heat in the cab to the outside of the cab to realize the cooling of the environment inside the cab.

[0051] Among them, the gas-liquid separator is used to separate gaseous refrigerant and liquid refrigerant to prevent liquid hammer and protect the compressor.

[0052] Among them, the condensing fan is used to accelerate the heat exchange between the condenser and the external environment and improve the heat dissipation and condensation efficiency.

[0053] 2) Cab air conditioning and heating:

[0054] Working condition ① When the engine is working, the waste heat of the engine is used to form a loop with the heater core in the HVAC air conditioning box under the drive of the first water pump. The blower dissipates the heat into the cab through blowing, and the excess heat of the engine, motor, motor controller, generator and generator controller is dissipated into the atmosphere through the radiator. Among them, the radiator accelerates the heat exchange with the external environment through the fan.

[0055] Working condition ② is when the engine is not working, that is, the power source is the battery, and the cab heating adopts a circuit consisting of the first liquid PTC, the first water pump and the heater core, that is, liquid PTC heating is adopted.

[0056] In working condition ③, when there is no heating demand in the cab and there is no cooling demand for the engine, motor, motor controller, generator and generator controller, the first water pump does not work and no coolant passes through the heater core.

[0057] When there is no heating demand in the cab, but the engine, or the motor and the motor controller, or the generator and the generator controller have a cooling demand, the first water pump works, and coolant passes through the heater core, but the HVAC air-conditioning box's heating and cooling doors close the heater core in a closed area. When the blower is not working, no wind passes through the heater core, and the air conditioner does not heat. The excess heat of the engine, motor, motor controller, generator and generator controller is dissipated into the atmosphere through the radiator.

[0058] 3) Battery cooling: mainly through high-voltage DC compressor compression refrigeration, and battery cooler plate heat exchange (battery cooler plate heat exchanger) to achieve heat exchange with the battery pack.

[0059] Refrigeration circuit: high-voltage DC compressor-condenser-second electronic expansion valve-battery cooler plate exchange-gas-liquid separator-high-voltage DC compressor;

[0060] Battery pack liquid cooling circulation loop (battery liquid cooling circulation loop): second water pump-battery pack-battery cooler plate exchanger-second expansion water tank-second water pump.

[0061] 4) Battery heating: The battery pack also uses liquid thermal PTC heating.

[0062] Battery heating circuit: second water pump-second liquid PTC-battery pack-second water pump.

[0063] 5) Motor / motor controller cooling, generator / generator controller cooling: The motor, motor controller, generator and generator controller are mainly cooled by air-cooled radiators (i.e. radiators with fans).

[0064] Cooling circuit: first water pump - heater core - radiator (with fan) - motor, motor controller, generator, generator controller - first expansion water tank - first water pump.

[0065] The utility model provides an integrated vehicle thermal management system for hybrid vehicles (such as hybrid sanitation transport vehicles and similar vehicles). The thermal management system integrates cab thermal management, battery thermal management, motor / motor controller thermal management, generator / generator controller thermal management and engine thermal management, and can simultaneously meet the vehicle thermal management requirements of cab air conditioning cooling / heating, battery cooling / heating, motor / motor controller cooling, generator / generator controller cooling and engine cooling. The vehicle thermal management system can meet the thermal management requirements of a single part, and can also meet the thermal management requirements of different parts at the same time.

[0066] The vehicle thermal management system mainly realizes cab cooling / heating, battery cooling / heating, and cooling of the engine, motor, generator and their corresponding controllers through direct cooling by the compressor and condenser, or heat exchange between the refrigerant and the coolant.

[0067] Among them, the cooling of the cab adopts the direct cooling method of refrigerant; the cooling of the battery adopts the liquid cooling method of heat exchange between the refrigerant and the coolant through plate heat exchange (plate heat exchanger); the cooling of the engine, motor and motor controller, generator and generator controller all adopts radiator air cooling; the heating of the cab adopts the waste heat of the engine, the waste heat of the motor and motor controller, the generator and generator controller, or the liquid PTC heating the coolant, and the heating of the battery pack adopts the liquid PTC heating the coolant.

[0068] Among them, the switching and adjustment of cab cooling and battery pack cooling are achieved through the action of the expansion valve (that is, the cooperation of the first expansion valve and the second expansion valve); the heating method of the cab is related to the power operation mode of the whole vehicle, and the cab heating can be achieved through intelligent switching by utilizing the waste heat of the engine, motor and motor controller, generator and generator controller, or by using liquid PTC heating.

[0069] Wherein, both the first expansion valve and the second expansion valve are electronic expansion valves.

[0070] Among them, the cooling of the engine, motor and motor controller, generator and generator controller is realized through the three-way valve to achieve separate and combined operation of cooling mode.

[0071] The cab cooling and battery pack cooling of the utility model adopt the same compressor refrigeration system, and the heat dissipation of the engine, the motor and the motor controller, the generator and the generator controller adopt the same radiator.

[0072] The compressor and heat dissipation fan adopted in the utility model all adopt variable frequency control to meet the needs of different cooling capacity and air volume under different operating conditions, reduce the number of compressor start and stop times, and improve energy utilization efficiency.

[0073] The utility model Figure 1 and Figure 2 As shown, an exhaust temperature sensor, a high pressure switch, a high pressure sensor and an ambient temperature sensor are sequentially provided on the pipeline between the compressor output side and the condenser input side. The specific positions can be referred to the positions in the figure.

[0074] Among them, the main function of the exhaust temperature sensor is to monitor the exhaust temperature of the compressor to prevent the exhaust temperature from being too high and causing damage to the system; the main function of the high-pressure pressure switch is to monitor the exhaust pressure of the compressor. When the exhaust pressure reaches the high-pressure upper limit, the compressor is cut off in time to prevent the pressure from being too high and causing damage to the system; the main function of the high-pressure pressure sensor is to monitor the exhaust pressure of the compressor, and adjust the speed of the condensing fan and the speed of the compressor in real time according to the detected refrigerant pressure, so that the thermal management system is in a stable, efficient and low-consumption operating state; the ambient temperature sensor is set on the air inlet side of the condenser. Its main function is to monitor the temperature of the external environment, and adjust the speed of the condensing fan and the upper limit of the compressor speed in real time according to the ambient temperature, so that the thermal management system is in a stable, efficient and low-consumption operating state.

[0075] A low-pressure switch is also installed on the pipeline between the input side of the compressor and the output side of the gas-liquid separator. The main function of the low-pressure switch is to monitor the suction pressure of the compressor. When the suction pressure reaches the lower limit of the low pressure, the compressor is cut off in time to prevent the system from being damaged by excessive low pressure.

[0076] An evaporator core temperature sensor for monitoring the evaporator core temperature is also provided at the location of the evaporator core. The main function of the evaporator core temperature sensor is to monitor the evaporator core temperature, control the compressor speed and other parameters according to the evaporator core temperature, so that the evaporator core temperature is maintained in a suitable temperature range, thereby ensuring that the temperature of the cab is appropriate.

[0077] A return air temperature sensor is also provided to monitor the return air temperature of the HVAC air conditioning box. The main function of the return air temperature sensor is to monitor the return air temperature of the HVAC air conditioning box and to participate in adjusting the speed of the compressor and the power of the first liquid PTC to ensure the comfort of the cab.

[0078] A water temperature sensor for monitoring the coolant temperature is also arranged on the pipeline between the connection point where the output side of the heater core is connected to the output side of the first liquid PTC and the input side of the radiator. The main function of the water temperature sensor is to monitor the temperature of the system coolant and adjust the speed of the radiator fan in real time.

[0079] A low-pressure P+T (a device with integrated protection and temperature monitoring functions) is also installed on the pipeline on the output side of the refrigerant side of the battery heat exchanger. The main function of the low-pressure P+T is to monitor the temperature and pressure on the refrigerant side of the battery heat exchanger, and adjust the speed of the compressor and the opening of the second electronic expansion valve according to these temperature and pressure parameters, so that the thermal management system is in a stable, efficient and low-consumption operating state.

[0080] A TMS return water temperature sensor is also installed on the pipeline between the liquid cooling side of the battery heat exchanger and the battery pack heat exchanger; a TMS outlet water temperature sensor is also installed on the pipeline between the second liquid PTC and the battery pack heat exchanger. The main function of the TMS return water temperature sensor and the TMS outlet water temperature sensor is to monitor the inlet and outlet water temperatures of the battery pack heat exchanger, and to adjust the speed of the compressor, the opening of the second electronic expansion valve (cooling condition) and the heating power of the second liquid PTC (heating condition) according to this temperature, so that the thermal management system is in a stable, efficient and low-consumption operating state.

[0081] The utility model uses the above-mentioned multiple temperature sensors and pressure sensors to feedback the operating parameters of the corresponding components, and adjusts the compressor speed, fan speed, blower air volume, electronic expansion valve opening, liquid PTC power, and water pump speed in real time to achieve precise and intelligent regulation.

[0082] Compared with existing hybrid vehicle models in which the driving thermal management, battery thermal management and cooling of the motor / motor controller and generator / generator controller are each independent systems, or partially integrated thermal management systems, this method makes full use of the waste heat of the hybrid vehicle engine during operation, as well as the waste heat of the motor / motor controller and generator / generator controller for cab heating, achieving the goals of energy saving and consumption reduction, maximum integration of vehicle thermal management and maximum sharing of components, and improving the utilization efficiency of components, thereby reducing the procurement and operating costs of the vehicle while meeting the thermal management efficiency.

Claims

1. An integrated thermal management system for a hybrid vehicle, characterized in that: The cab heating circulation loop includes a waste heat branch, a first water pump and a heater core connected in series, and the waste heat branch includes: a first heat exchange branch connected in series with an engine heat exchanger for exchanging heat with an engine, a second heat exchange branch connected in series with a motor assembly heat exchanger for exchanging heat with a motor assembly, and a third heat exchange branch connected in series with a generator assembly heat exchanger for exchanging heat with a generator assembly, any two branches connected in parallel or a combination of three branches connected in parallel; The first water pump is used to accelerate the circulation of the refrigerant in the cab heating circulation loop, and the heater core is used to realize the heat exchange between the cab heating circulation loop and the environment inside the cab.

2. The integrated thermal management system for a hybrid vehicle according to claim 1, characterized in that: The cab heating circulation loop is also connected in series with a radiator, which is arranged on a pipeline between the input end of the waste heat branch and the output end of the heater core, and is used to exchange heat with the external environment to dissipate the heat of the coolant output by the heater core.

3. The integrated thermal management system for a hybrid vehicle according to claim 2, characterized in that: The cab heating circulation loop also includes a first heating branch connected in series with a first heater, and the first heating branch and the series-connected waste heat branch are connected in parallel with the radiator.

4. The integrated thermal management system for a hybrid vehicle according to claim 1, characterized in that: The cab heating circulation loop also includes a second heating branch connected in series with a second heater, and the second heating branch is connected in parallel with the waste heat branch.

5. The integrated thermal management system for a hybrid vehicle according to claim 1, characterized in that: It also includes a cab refrigeration cycle circuit, which includes a compressor, a condenser, a first expansion valve and an evaporator core connected in series; the evaporator core is used to achieve heat exchange between the cab refrigeration cycle circuit and the environment inside the cab, and the first expansion valve is arranged on a pipeline close to the input side of the evaporator core.

6. The integrated thermal management system for a hybrid vehicle according to claim 5, characterized in that: The heater core and the evaporator core accelerate heat exchange with the environment in the cab through the same fan.

7. The integrated thermal management system for a hybrid vehicle according to claim 5, characterized in that: It also includes a battery cooling branch connected in parallel with the first expansion valve in series and the evaporator core, the battery cooling branch includes a second expansion valve in series and a refrigerant side of a battery heat exchanger used for heat exchange with a battery liquid cooling circulation loop; the second expansion valve is arranged on the pipeline between the output side of the condenser and the input side of the battery heat exchanger, and is arranged close to the input side of the battery heat exchanger.

8. The integrated thermal management system for a hybrid vehicle according to claim 7, characterized in that: The battery liquid cooling circulation loop includes a second water pump connected in series, a battery pack heat exchanger for exchanging heat with the battery pack, and a liquid cooling side of the battery heat exchanger. The refrigerant side of the battery heat exchanger exchanges heat with its liquid cooling side. The second water pump is used to accelerate the circulation of the coolant in the battery liquid cooling circulation loop.

9. The integrated thermal management system for a hybrid vehicle according to claim 8, characterized in that: The battery liquid cooling circulation loop is also connected in series with a third heater.

10. The integrated thermal management system for a hybrid vehicle according to claim 1, characterized in that: The motor assembly heat exchanger includes a motor heat exchanger and a motor controller heat exchanger, and the generator assembly heat exchanger includes a generator heat exchanger and a generator controller heat exchanger.

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