A range-extending automotive heat pump system

Abstract

The application relates to a range-extending automobile heat pump system, which comprises an out-cabin heat exchanger, an in-cabin heat exchanger, a heat exchange core, a plate heat exchanger, a cooler, a compressor, a liquid accumulator, a four-way valve, a throttling pipe, an electronic expansion valve and an engine heating core. The system can realize two working conditions of a refrigeration mode and a heating mode, optimizes a heat management system and optimizes energy distribution by cooperation of engine water circulation and a heat pump air conditioning system. The refrigerant circulation loop is adjusted through the four-way valve. In the refrigeration mode, the introduction of the plate heat exchanger can increase the enthalpy of the compressor inlet refrigerant, and the refrigeration effect is enhanced. In the heating mode, the plate heat exchanger absorbs exhaust refrigerant waste heat, is used for cabin cold start heating and out-cabin heat exchanger defrosting, the in-cabin heat exchanger is used for cabin heating, and after the engine water temperature rises, the water heating heating is switched, the heating thermal inertia problem of the current hybrid vehicle is solved, the energy consumption of the heat pump heating is greatly reduced, and the cruising range is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air conditioners for automobiles, and particularly relates to a range-extender automobile heat pump system. BACKGROUND

[0002] A heat pump air conditioner is usually applied to a pure electric vehicle and can be used to improve the winter range because the power consumption thereof is lower than that of a PTC heating. The principle of the heat pump air conditioner is to realize cold and heat utilization of a refrigerant circuit through cooperation of a series of one-way valves, multi-way valves and heat exchangers, so as to realize cabin heating and cooling.

[0003] For cabin heating of a hybrid vehicle, the current mainstream mode is to use the waste heat of a power system, and some use PTC heating. The existing technical solutions, such as the range-extender automobile of the ideal ONE, use engine waste heat to heat the cabin. The existing solutions have two main shortcomings: 1. If engine waste heat is used for heating, there is a large thermal inertia, and the cabin cannot be heated in the first time. Moreover, the engine does not necessarily work for a long time. If PTC is used to compensate for heating of the cabin, more electric energy will be consumed, which affects the range and energy consumption. SUMMARY

[0004] The purpose of the present application is to provide a range-extender automobile heat pump system to solve the problems of high energy consumption of the current range-extender winter heating and thermal inertia of engine waste heat.

[0005] To achieve the above purpose, the present application is implemented by the following technical solutions:

[0006] A range-extender automobile heat pump system comprises an outside cabin heat exchanger, an inside cabin heat exchanger, a heat exchange core, a plate heat exchanger, a cooler, a compressor, a liquid accumulator, a four-way valve, a throttling pipe, an electronic expansion valve and an engine warm air core.

[0007] The engine cooling water outlet is connected to the engine warm air core inlet through a pipeline, the engine warm air core outlet is connected to the hot fluid inlet of the plate heat exchanger through a pipeline, the hot fluid outlet of the plate heat exchanger is connected to the inlet of the heat exchange core through a pipeline, and the outlet of the heat exchange core is connected to the engine cooling water inlet through a pipeline.

[0008] The inlet of the outside cabin heat exchanger is connected to the first opening of the four-way valve through a pipeline, the second opening of the four-way valve is connected to the inlet of the liquid accumulator through a pipeline, the outlet of the liquid accumulator is connected to the inlet of the compressor through a pipeline, the outlet of the compressor is connected to the third opening of the four-way valve through a pipeline, the fourth opening of the four-way valve is connected to the cold fluid outlet of the plate heat exchanger through a pipeline, the cold fluid inlet of the plate heat exchanger is connected to the outlet of the inside cabin heat exchanger through a pipeline, and the inlet of the inside cabin heat exchanger is connected to the outlet of the outside cabin heat exchanger through a pipeline after the throttling pipe.

[0009] A cooler and an electronic expansion valve are further connected by pipelines between the cold flow inlet of the plate heat exchanger and the outlet of the cabin heat exchanger.

[0010] Further, a first stop valve is arranged on the pipeline between the throttle pipe and the cabin heat exchanger.

[0011] Further, a second stop valve is connected in parallel between the inlet and the outlet of the heat exchange core.

[0012] Further, a fan is arranged at the cabin heat exchanger and the heat exchange core.

[0013] Further, a first temperature sensor is arranged on the pipeline between the hot flow inlet of the plate heat exchanger and the outlet of the cabin heat exchanger, and a second temperature sensor is arranged on the pipeline between the cold flow inlet of the plate heat exchanger and the outlet of the cabin heat exchanger.

[0014] Further, the four-way valve is connected in the refrigeration mode, in which the first opening and the third opening of the four-way valve are communicated, and the second opening and the fourth opening of the four-way valve are communicated.

[0015] Further, the four-way valve is connected in the heating mode, in which the first opening and the second opening of the four-way valve are communicated, and the third opening and the fourth opening of the four-way valve are communicated.

[0016] The beneficial effects of the present application are:

[0017] The present application optimizes the heat management system and the energy distribution by designing a hybrid heat pump system, utilizing the cooperation of the engine water circulation and the heat pump air conditioning system. The refrigerant circulation loop is adjusted by the four-way valve. In the refrigeration mode, the introduction of the plate heat exchanger can increase the enthalpy of the compressor inlet refrigerant, and enhance the refrigeration effect. In the heating mode, the plate heat exchanger absorbs the exhaust refrigerant waste heat, which is used for cabin heating and defrosting of the cabin heat exchanger. The cabin heat exchanger is used for cabin heating, and is switched to water heating after the engine water temperature rises, which solves the heating inertia problem of the current hybrid vehicle, reduces the energy consumption of the heat pump heating, and improves the cruising range. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the heat management architecture of the present application.

[0019] Figure 2 The figure is a schematic diagram of the working condition in the refrigeration mode.

[0020] Figure 3 The figure is a schematic diagram of the working condition in the heating mode. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings, and the following examples are only exemplary and can only be used to explain and illustrate the technical solutions of the present application, but cannot be interpreted as a limitation of the technical solutions of the present application.

[0022] The technical solutions provide an extended-range automobile heat pump system, which adopts the combination of engine waste heat and heat pump air conditioner to heat the cabin, and has the effects of high efficiency and energy saving.

[0023] As shown in Figure 1 The extended-range automobile heat pump system of the present application comprises an out-cabin heat exchanger, an in-cabin heat exchanger, a heat exchange core, a plate heat exchanger, a cooler, a compressor, a liquid accumulator, a four-way valve, a throttling pipe, an electronic expansion valve, a first stop valve, a second stop valve, a first temperature sensor, a second temperature sensor and an engine heater core.

[0024] The engine cooling water outlet is connected to the engine heater core water inlet through a pipeline, the engine heater core water outlet is connected to the hot fluid inlet of the plate heat exchanger through a pipeline, the hot fluid outlet of the plate heat exchanger is connected to the inlet of the heat exchange core through a pipeline, and the outlet of the heat exchange core is connected to the engine cooling water inlet through a pipeline.

[0025] The inlet of the out-cabin heat exchanger is connected to the first opening of the four-way valve through a pipeline, the second opening of the four-way valve is connected to the inlet of the liquid accumulator through a pipeline, the outlet of the liquid accumulator is connected to the inlet of the compressor through a pipeline, the outlet of the compressor is connected to the third opening of the four-way valve through a pipeline, the fourth opening of the four-way valve is connected to the cold fluid outlet of the plate heat exchanger through a pipeline, the cold fluid inlet of the plate heat exchanger is connected to the outlet of the in-cabin heat exchanger through a pipeline, and the inlet of the in-cabin heat exchanger is connected to the outlet of the out-cabin heat exchanger through a pipeline after the throttling pipe.

[0026] The cooler and the electronic expansion valve are further connected between the cold fluid inlet of the plate heat exchanger and the outlet of the out-cabin heat exchanger through a pipeline.

[0027] The first stop valve is arranged on the pipeline between the throttling pipe and the in-cabin heat exchanger, and the second stop valve is connected in parallel between the inlet and the outlet of the heat exchange core.

[0028] Fans are arranged at the out-cabin heat exchanger and the heat exchange core. The first temperature sensor is arranged on the pipeline between the hot fluid inlet of the plate heat exchanger and the outlet of the heater core, and the second temperature sensor is arranged on the pipeline between the cold fluid inlet of the plate heat exchanger and the outlet of the in-cabin heat exchanger.

[0029] The functions of the components of the present application are as follows:

[0030] The out-cabin heat exchanger exchanges heat with the outside, and is used as an evaporator in the cabin heating mode and as a condenser in the refrigeration and heat recovery modes.

[0031] Cabin heat exchanger: exchange heat with the cabin, used as condenser in heating mode, used as evaporator in cooling and heat recovery mode.

[0032] Heat exchange core: a small heat exchange element, cooperate with the fan to defrost the cabin heat exchanger in winter, prevent the cabin heat exchanger from poor heat exchange. The stop valve is normally open, only energized to close when defrosting is needed, and the small fan works at the same time.

[0033] Plate heat exchanger: a component that exchanges heat between refrigerant and coolant, with moderate heat exchange capacity. In winter, it uses the residual heat of the refrigerant to assist in raising the engine water circulation temperature and compensate for the demand for heat components. In summer, it starts a certain heat dissipation effect to improve the cooling effect.

[0034] Fan: There are three fans in the system, all of which play a role in improving heat dissipation.

[0035] Compressor: used to compress gaseous refrigerant to increase the enthalpy of the refrigerant.

[0036] Liquid accumulator: arranged before the compressor, used to store liquid refrigerant about to enter the compressor to prevent liquid damage to the compressor.

[0037] Four-way valve: can realize two-by-two communication and isolation of four paths, and plays a role in transforming the flow direction of the refrigerant in the system, controlling the switching of cabin cooling and heating modes.

[0038] Stop valve: used to cut off the cooling liquid flow in the branch.

[0039] Temperature sensor: two temperature sensors are used to detect the temperature of the refrigerant and water at the inlet side of the cabin.

[0040] Throttling pipe: plays a role in throttling high-pressure liquid refrigerant, similar to the expansion valve. The throttled refrigerant expands and releases through the heat exchanger, absorbs heat, and produces cooling.

[0041] Chiller: battery path heating and cooling heat exchanger.

[0042] Electronic expansion valve (EXV): electronic expansion valve, battery path refrigerant regulation.

[0043] Using the above range-extending vehicle heat pump system, at least two working conditions can be achieved, namely cooling mode and heating mode.

[0044] The cooling mode is as follows: Figure 2As shown, in this mode, the first and third openings of the four-way valve are connected, and the second and fourth openings are connected. At this time, the external heat exchanger acts as a condenser. If the battery requires cooling, the EXV valve opens for regulation; if the battery does not require cooling, the EXV valve remains normally closed. If only the battery requires cooling, the shut-off valve closes. The plate heat exchanger exchanges heat at the compressor suction end and in the small circulation loop, lowering the water temperature while increasing its own enthalpy, thus enhancing the cooling effect.

[0045] Among them, the heating mode is as follows Figure 3 As shown, in this mode, the first and second openings of the four-way valve are connected, and the third and fourth openings are connected. At this time, the plate heat exchanger, the in-cabin heat exchanger, and the chiller function as condensers. The EXV regulates refrigerant flow when the battery needs heating, and closes when not needed. The external heat exchanger acts as an evaporator. When a cabin heating request is received, the shut-off valve opens. In winter heating mode, the plate heat exchanger prioritizes heating the small circulation loop. At this time, the leftmost shut-off valve closes, and the heat exchange core, in conjunction with a fan, defrosts the external heat exchanger to prevent frost from clogging the core and causing poor heat exchange.

[0046] In heating mode, the temperature of the medium is detected by temperature sensors in front of the cabin heat exchanger and the heater core. The branch with the higher temperature is selected for heating. That is, if the detected engine coolant temperature is higher than the refrigerant exhaust temperature, the heat pump is shut down, and more energy-efficient waste heat from the engine is used for heating. If the detected engine coolant temperature is very low, the heat pump is used for heating.

[0047] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A range extended automotive heat pump system, characterized in that, The heat exchanger comprises an outside cabin heat exchanger, an inside cabin heat exchanger, a heat exchange core, a plate heat exchanger, a cooler, a compressor, a liquid reservoir, a four-way valve, a throttling pipe, an electronic expansion valve and an engine warm air core. The engine cooling water outlet is connected with the engine warm air core inlet through a pipeline, the engine warm air core outlet is connected with the hot fluid inlet of the plate heat exchanger through a pipeline, the hot fluid outlet of the plate heat exchanger is connected with the inlet of the heat exchange core through a pipeline, and the outlet of the heat exchange core is connected with the engine cooling water inlet through a pipeline. The inlet of the outside cabin heat exchanger is connected with the first opening of the four-way valve through a pipeline, the second opening of the four-way valve is connected with the inlet of the liquid reservoir through a pipeline, the outlet of the liquid reservoir is connected with the inlet of the compressor through a pipeline, the outlet of the compressor is connected with the third opening of the four-way valve through a pipeline, the fourth opening of the four-way valve is connected with the cold fluid outlet of the plate heat exchanger through a pipeline, the cold fluid inlet of the plate heat exchanger is connected with the outlet of the inside cabin heat exchanger through a pipeline, and the inlet of the inside cabin heat exchanger is connected with the outlet of the outside cabin heat exchanger through a pipeline after being connected with the throttling pipe. The cooler and the electronic expansion valve are further connected through a pipeline between the cold fluid inlet of the plate heat exchanger and the outlet of the outside cabin heat exchanger. The four-way valve is in a refrigeration mode, in which the first opening and the third opening of the four-way valve are communicated, and the second opening and the fourth opening of the four-way valve are communicated; at this time, the outside cabin heat exchanger functions as a condenser, and if the battery needs refrigeration, the EXV is opened for adjustment; if the battery does not need refrigeration, the EXV is normally closed; if only the battery needs refrigeration, the stop valve is closed, and the plate heat exchanger exchanges heat at the suction end of the compressor and the small cycle; The four-way valve is in a heating mode, in which the first opening and the second opening of the four-way valve are communicated, and the third opening and the fourth opening of the four-way valve are communicated; at this time, the plate heat exchanger, the inside cabin heat exchanger and the chiller function as condensers, when the battery needs heating, the EXV adjusts the refrigerant flow, and when the battery does not need heating, the EXV is closed, the outside cabin heat exchanger functions as an evaporator, when the cabin requests heating, the stop valve is opened, in the winter heating mode, the plate heat exchanger preferentially supplies heating to the small cycle, at this time, the leftmost stop valve is closed, the heat exchange core cooperates with the fan to defrost the outside cabin heat exchanger, so as to prevent ice and frost from blocking the core and causing poor heat exchange.

2. The super-turbocharged vehicle heat pump system of claim 1, wherein, A first stop valve is arranged on the pipeline between the throttling pipe and the inside cabin heat exchanger.

3. The super-turbocharged vehicle heat pump system of claim 1, wherein, Second stop valves are connected in parallel between the inlet and the outlet of the heat exchange core.

4. The super-turbocharged vehicle heat pump system of claim 1, wherein, Fans are arranged at the outside cabin heat exchanger and the heat exchange core.

5. The range extended automotive heat pump system of claim 1, wherein, A first temperature sensor is arranged on the pipeline between the hot fluid inlet of the plate heat exchanger and the outlet of the warm air core, and a second temperature sensor is arranged on the pipeline between the cold fluid inlet of the plate heat exchanger and the outlet of the inside cabin heat exchanger.

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