CN-121989637-A - Whole vehicle thermal management method based on injection type air supplementing enthalpy increasing heat pump

CN121989637ACN 121989637 ACN121989637 ACN 121989637ACN-121989637-A

Abstract

The invention relates to the technical field of heat pump systems, in particular to a whole vehicle heat management method based on an injection type air supplementing and enthalpy increasing heat pump. The traditional air supplementing and enthalpy increasing heat pump system has a complex structure and cannot perform effective and controllable heat exchange with various vehicle-mounted functional components in the whole vehicle heat management system. Aiming at the problems, the invention provides a whole vehicle heat management method based on an injection type air-supplementing enthalpy-increasing heat pump, and a stable air-supplementing enthalpy-increasing loop is constructed in a heat pump system. The medium-pressure gaseous refrigerant in the gas-liquid separator continuously supplements the enthalpy of the compressor. Meanwhile, the heat pump system is deeply coupled with the whole vehicle heat management system, and the central integrated module formed by the heat management controller and the temperature sensor can be used for acquiring the temperature states of the vehicle-mounted functional components such as the electric drive module, the battery module, the cabin module and the like in real time and dynamically distributing heat according to actual demands.

Inventors

CHEN RUNKUN
ZHOU ANG
LIU RUI
PENG XINYI
TANG ZIJIE
ZHANG RUXIANG
Ni Yanxi
ZHOU SHAODONG
TIAN GUANGHONG

Assignees

常州信息职业技术学院

Dates

Publication Date: 20260508
Application Date: 20260331

Claims (7)

1. The whole vehicle heat management method based on the injection type air supplementing and enthalpy increasing heat pump is characterized by comprising a heat pump system and a whole vehicle heat management system; The heat pump system comprises a refrigerant main closed circulation loop formed by sequentially connecting a compressor, a condenser, an ejector, a gas-liquid separator, an electronic expansion valve and an evaporator; After the heat pump system is started, high-temperature high-pressure gaseous refrigerant discharged by the compressor is changed into high-pressure liquid refrigerant after heat exchange by the condenser, the high-pressure liquid refrigerant enters from a primary inflow port of the ejector, is sprayed out from an ejector nozzle and enters the gas-liquid separator, liquid at the bottom of the gas-liquid separator flows through the electronic expansion valve and enters the evaporator to be evaporated into low-pressure gaseous refrigerant, one part of the low-pressure gaseous refrigerant flows back to the compressor to complete heating cycle, the other part of the low-pressure gaseous refrigerant is sucked in by a secondary inflow port of the ejector under negative pressure, and the gas in the gas-liquid separator carries out enthalpy increasing and gas supplementing on the compressor through a gas supplementing port of the compressor; The condenser and the evaporator of the heat pump system respectively perform electric control heat exchange with a heat distribution refrigerant circulation pipeline of the whole vehicle heat management system according to the requirement, and respectively realize controllable cooling or controllable heating of vehicle-mounted functional components in the whole vehicle heat management system.
2. The method for overall vehicle thermal management based on the injection type air supplementing and enthalpy increasing heat pump according to claim 1, wherein the vehicle-mounted functional component is at least one of an electric drive module, a battery module, a cabin module and a radiator module.
3. The method for whole vehicle heat management based on injection type air supplementing and enthalpy increasing heat pump according to claim 1, wherein the whole vehicle heat management system comprises a heat management controller, a temperature sensor and a heat distribution refrigerant circulation pipeline, the heat distribution refrigerant circulation pipeline comprises a heating circulation pipeline and a refrigerating circulation pipeline, the refrigerating circulation pipeline or the heating circulation pipeline is a physical channel for forming heat exchange with a vehicle-mounted functional component, the heat management controller and the temperature sensor are in control connection through a circuit board to form a central integrated module, the temperature sensor is used for realizing temperature acquisition of the vehicle-mounted functional component and converting the temperature acquisition into a temperature electric signal and then feeding the temperature electric signal back to the heat management controller, the heat management controller is used for controlling operation of a heating closed circulation pipeline or a refrigerating closed circulation pipeline through an electromagnetic valve through analysis and calculation according to the temperature electric signal fed back by the temperature sensor, and meanwhile, different heat or cold quantity distribution is carried out on different vehicle-mounted functional components through adjusting opening of an electromagnetic flow valve in the heating circulation pipeline or the refrigerating circulation pipeline.
4. The method for overall thermal management based on the injection type air-supplementing enthalpy-increasing heat pump according to claim 3, characterized in that, The heating circulation pipeline is a circulation closed loop formed by sequentially connecting an expansion tank, a water pump, a PTC thermistor and the expansion tank through pipelines, a plurality of parallel branches are further arranged in the heating circulation pipeline, each parallel branch is respectively responsible for heat exchange of different vehicle-mounted functional components, electromagnetic flow valves are arranged on parallel branches which are in heat exchange with different vehicle-mounted functional components, heat distribution of refrigerants in the heating circulation pipeline at different vehicle-mounted functional components is adjusted through the electromagnetic flow valves, wherein the parallel branches which are in heat exchange with a battery module are not provided with the electromagnetic flow valves, and a pipeline part between the parallel branches and the PTC thermistor in the heating circulation pipeline is in heat exchange with a condenser in a heat pump system.
5. The method for overall thermal management based on the injection type air-supplementing enthalpy-increasing heat pump according to claim 3, characterized in that, The refrigeration cycle pipeline is a circulation closed loop formed by sequentially connecting an expansion tank and a water pump through pipelines, a plurality of parallel branches are further arranged in the refrigeration cycle pipeline, each parallel branch is respectively responsible for heat exchange of different vehicle-mounted functional components, electromagnetic flow valves are arranged on the parallel branches for heat exchange with different vehicle-mounted functional components, cold energy distribution of a refrigerant in the refrigeration cycle pipeline at different vehicle-mounted functional components is adjusted through the electromagnetic flow valves, the parallel branches for heat exchange with the battery module are not provided with the electromagnetic flow valves, and a pipeline part of the refrigeration cycle pipeline between the parallel branches and the water pump exchanges heat with an evaporator in the heat pump system.
6. The method for whole vehicle heat management based on the injection type air-supplementing enthalpy-increasing heat pump according to claim 1, wherein the whole vehicle heat management system comprises a static mode, a refrigerating mode and a heating mode, In a heating mode, the heat pump system is started, the on-board functional component needs to be heated, a heating closed circulation pipeline of the whole vehicle heat management system exchanges heat with a condenser of the heat pump system, and a refrigerant circularly flows in the heating closed circulation pipeline of the whole vehicle heat management system; In a refrigeration mode, the heat pump system is started, the vehicle-mounted functional component needs to be refrigerated, a heating circulation pipeline of the whole vehicle heat management system exchanges heat with an evaporator of the heat pump system, and a refrigerant circularly flows in a refrigeration closed circulation pipeline of the whole vehicle heat management system; In the static mode, the compressor of the heat pump system is stopped, the vehicle-mounted functional component does not need to refrigerate or heat, and the cooling fluid in the whole vehicle heat management system neither circularly flows in the refrigeration closed circulation pipeline nor circularly flows in the heating closed circulation pipeline.
7. The method for overall thermal management based on an ejector type air-supplementing enthalpy-increasing heat pump according to claim 6, wherein the refrigerant is an aqueous solution.

Description

Whole vehicle thermal management method based on injection type air supplementing enthalpy increasing heat pump Technical Field The invention relates to the technical field of heat pump systems, in particular to a whole vehicle heat management method based on an injection type air supplementing and enthalpy increasing heat pump. Background With the rapid development of new energy automobile industry, the energy efficiency and integration level of the whole automobile thermal management system become key factors affecting the endurance mileage, safety and comfort of the automobile. Currently, heat pump systems are commonly adopted as efficient heat generation solutions for pure electric vehicles and hybrid electric vehicles to replace traditional electric heating modes (such as PTC heaters), so that battery energy consumption is effectively reduced and the whole vehicle endurance is improved in a low-temperature environment. However, when the traditional heat pump system operates under a low-temperature working condition, the problems of obvious attenuation of heating efficiency, overhigh exhaust temperature of a compressor, reduced system stability and the like exist. In order to improve the problems, a gas-supplementing enthalpy-increasing (EVI) technology is introduced in the prior art, and the circulation quantity of the medium pressure gaseous refrigerant is increased by supplementing the medium pressure gaseous refrigerant to the compressor, so that the heating performance and the energy efficiency ratio of the system in a low-temperature environment are improved. However, the conventional air supplementing and enthalpy increasing heat pump system generally adopts a plate heat exchanger or a flash evaporator as an air supplementing component, and has the defects of complex structure, high control difficulty, high cost, obvious pressure drop loss of the system and the like. On the other hand, along with the improvement of the integration degree of the whole vehicle, the requirements of key components such as a power battery, an electric driving system, a cabin air conditioner and the like on heat management are increasingly refined. In a traditional whole-vehicle heat management system, heating and cooling of each functional component are often controlled independently, and a heat source and a cold source lack of cooperation, so that energy utilization efficiency is low, and unified dispatching and on-demand distribution of whole-vehicle heat are difficult to realize. In the prior art, although some schemes attempt to couple a heat pump system with the whole vehicle in a thermal management manner, the problems of complex system architecture, complicated control logic, inflexible switching under different working conditions and the like still exist, and the energy efficiency, the cost control and the multi-working condition adaptability of the system are difficult to consider. Therefore, the heat pump thermal management method which has simple structure, high control efficiency and capability of realizing the cooperative management of the whole vehicle heat is developed, and has important engineering application value. By introducing the injection type air supplementing and enthalpy increasing technology and combining an integrated whole vehicle heat management control strategy, the heat pump system and the vehicle-mounted functional components (such as a battery, an electric drive and a cabin) can be flexibly distributed and efficiently utilized, and the technical problem to be solved in the technical field of the current whole vehicle heat management is urgent. Disclosure of Invention The prior art has the problems that the traditional air supplementing and enthalpy increasing heat pump system has a complex structure and can not effectively and controllably exchange heat with various vehicle-mounted functional components in the whole vehicle heat management system. Aiming at the problems, the invention provides a whole vehicle heat management method based on an injection type air supplementing and enthalpy increasing heat pump, which comprises a heat pump system and a whole vehicle heat management system; The heat pump system comprises a refrigerant main closed circulation loop formed by sequentially connecting a compressor, a condenser, an ejector, a gas-liquid separator, an electronic expansion valve and an evaporator; After the heat pump system is started, high-temperature high-pressure gaseous refrigerant discharged by the compressor is changed into high-pressure liquid refrigerant after heat exchange by the condenser, the high-pressure liquid refrigerant enters from a primary inflow port of the ejector, is sprayed out from an ejector nozzle and enters the gas-liquid separator, liquid at the bottom of the gas-liquid separator flows through the electronic expansion valve and enters the evaporator to be evaporated into low-pressure gaseous refrigerant, one part of the low-pressure gaseous refrigerant