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Thermal management system and control method for a four-wheel-drive hybrid electric vehicle

A technology for hybrid electric vehicles and thermal management systems, which is applied in vehicle components, air handling equipment, heating/cooling equipment, etc., and can solve the problems of decreased pure electric cruising range of hybrid electric vehicles, inability to charge and discharge batteries normally, and dispersion.

Active Publication Date: 2021-05-18
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For plug-in four-wheel drive hybrid vehicles that are between gasoline and pure electric vehicles, the number of components that need to be cooled increases, and there will be cross-control, and the control of cooling and heating becomes more complicated
The subsystems of the existing hybrid vehicle thermal management system are relatively scattered and isolated, and the waste heat of each subsystem cannot be effectively used for unified and integrated management
At present, most of the air-conditioning systems of hybrid electric vehicles use single cooling, and heating equipment (PTC) is used to heat the passenger compartment in winter. Give full play to the advantages of hybrid vehicle mileage and low emissions
At the same time, when the ambient temperature is relatively low, the battery cannot be charged and discharged normally, making it difficult to drive the motor to work

Method used

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  • Thermal management system and control method for a four-wheel-drive hybrid electric vehicle
  • Thermal management system and control method for a four-wheel-drive hybrid electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: When the ambient temperature is high in summer: the system switches from the standby state to the cooling demand state. At this time, when the passenger compartment needs to be cooled, the heat pump air-conditioning refrigeration circuit is turned on. At this time, the external heat exchanger 1 two-way valve 3 electric Compressor 4 liquid storage tank 5 internal evaporator 7 electronic expansion valve 8 water-cooled condenser 13 constitutes a heat pump refrigeration cycle. The low-temperature and low-pressure superheated gas from the internal evaporator 7 enters the liquid storage tank 5 for gas-liquid separation. After the liquid is separated, the dry superheated gas is sucked by the electric compressor 4 and compressed into high-temperature and high-pressure gas, which is discharged and then enters the outdoor heat exchanger to release heat. Condensation becomes supercooled liquid. The supercooled liquid becomes a low-temperature and low-pressure two-phase ...

example 2

[0049] Example 2: When the temperature is low in winter: the system state is switched from standby to heating mode. When the temperature of the battery temperature module is low, the battery preheating circuit is started to control the heating PTC: battery cooler 9 battery circuit water pump 10 heating PTC11 battery module 12 . Carry out preheating treatment to meet the battery operating temperature requirements. When the battery power is low and the car is in the engine mode, the system switches to the engine heating mode at this time, and the starting circuit: water-cooled condenser 13 engine module 14 engine circuit three-way valve 15 water pump 16 heating warm air core 17. Use the heat of the engine to The passenger compartment is heated.

[0050] When the battery is fully charged, the car is in pure electric mode, and the ambient temperature T Amb When ≥10°C, start the heat pump heating circuit: external heat exchanger 1 two-way valve 3 electric compressor 4 liquid stor...

example 3

[0053] Example 3: Ambient temperature T Amb When the temperature is ≥10°C, the corresponding mode will be adopted according to the required heat load. When in the hybrid mode, when the load demand is large: start the heat pump air conditioning system and the waste heat recovery circuit for maximum heating; when the load demand is small: start The waste heat recovery circuit reduces the start-up of the heat pump air-conditioning circuit and reduces energy consumption. If it is in pure electric mode at this ambient temperature, the compressor speed and temperature damper are controlled by starting the heat pump air-conditioning circuit and the motor waste heat recovery circuit, so as to achieve the purpose of precise and effective heating. When -5℃Amb When Amb When <-5°C, the heating efficiency of the heat pump air conditioner is low at this time. At this time, effective heating is carried out by starting the engine and heating the PTC.

[0054] 1. The present invention aims at...

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Abstract

The present invention claims a heat management system and its control method for a four-wheel-drive hybrid vehicle. The system is mainly divided into four parts: a heat pump air conditioner, a battery cooling part, a motor cooling part, and an engine heating part. The thermal management of the cooling, heating, battery and motor of the hybrid car is unified and integrated. The heat pump technology is adopted to recover the heat of the drive unit. The cooling mode also takes battery cooling into consideration. The comprehensive thermal management system of the four-wheel drive hybrid vehicle. The cooling part of the motor is divided into the cooling part of the front drive motor: the generator IPU unit 1 the cooling part of the front drive motor and the rear drive motor: the rear drive motor charger IPU unit. Engine module means a module with an engine cooling circuit. Internal evaporator. The heating core is used as part of the HVAC interior of the air conditioning box assembly. The invention has high efficiency and energy saving and reduces the failure rate.

Description

technical field [0001] The invention belongs to the technical field of new energy electric vehicles, and in particular relates to a heat management system and a control method for a four-wheel-drive hybrid electric vehicle. Background technique [0002] Energy and environmental protection issues are global problems today. With global warming and environmental pollution gradually attracting people's attention, various countries have also put forward corresponding measures and development strategies for environmental protection. The governments and vehicle manufacturers of various countries are also paying more attention to the energy-saving and emission-reduction effects of vehicles. The energy consumption and pollution emissions of traditional fuel vehicles can no longer meet the increasingly stringent regulatory requirements. From now to around 2030, petroleum energy will gradually transform to clean energy, and new energy vehicles will surely become an important developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60H1/00B60H1/03
CPCB60H1/00278B60H1/004B60H1/03B60H1/034Y02T10/88
Inventor 冯辉宗郎仲令袁荣棣禇良宇侯小康张芹
Owner CHONGQING UNIV OF POSTS & TELECOMM
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