An automobile engine waste heat recovery control system and control method

Abstract

The application discloses a kind of automobile engine waste heat recovery control system and control method, belong to automobile engine waste heat recovery technical field, this automobile engine waste heat recovery control system, including absorption refrigeration system, battery thermal management system and engine cooling system, the inlet of the absorption refrigeration system is connected with the engine cooling system, the outlet of the absorption refrigeration system is connected with the engine cooling system by the battery thermal management system, the beneficial effect of the present application is, the absorption refrigeration system, battery thermal management system and engine cooling system are combined in the present application, only utilize engine waste heat as heat source to realize absorption refrigeration system and battery thermal management system's refrigeration and heating, so that whole vehicle energy consumption is lower, noise is smaller, environmental protection is better, user use cost is lower.

Description

Technical Field

[0001] This invention relates to the field of automotive engine waste heat recovery technology, and in particular to an automotive engine waste heat recovery control system and control method. Background Technology

[0002] Thermal management of the entire vehicle and its power battery is crucial not only for the performance and safety of the vehicle and battery, but also for the energy consumption of the vehicle and the lifespan of the power battery. For new energy vehicles, at high temperatures, the currently widely adopted air conditioning compressor cooling system provides cooling for the vehicle interior, while simultaneously providing low-temperature cooling water to the power battery through a heat exchanger. At low temperatures, the vehicle interior uses a PTC heater core for heating, while the power battery uses external PTC liquid heating or PTC heating technology integrated with liquid cooling.

[0003] As a type of new energy vehicle, plug-in hybrid electric vehicles (PHEVs) have been widely developed because they combine the advantages of pure electric and gasoline vehicles. The refrigeration compressor and heating system of this type of vehicle's thermal management system both consume electricity to achieve cooling and heating. The electricity consumption is relatively large in summer and winter, which seriously affects the energy consumption of the whole vehicle in low temperature and high temperature environments and the lifespan of the power battery, thus increasing the user's operating costs.

[0004] For example, patent CN202470534U discloses a device for cooling using waste heat from an automobile engine. This device absorbs waste heat from the vehicle through a heat exchanger to heat a low-boiling-point kinetic medium, which is then driven by an expander to drive a refrigeration compressor, achieving vapor compression refrigeration. The device includes a drive system and a refrigeration cycle system. The drive system comprises a heat exchanger, expander, condenser, receiver, working fluid pump, and a low-boiling-point kinetic medium; these components are connected sequentially. The refrigeration cycle system includes a refrigeration compressor, evaporator, condenser, expansion valve, and refrigerant. The heat exchanger absorbs waste heat from the vehicle to heat the low-boiling-point kinetic medium, which is then driven by the expander to drive the refrigeration compressor, which in turn drives the refrigeration cycle system. However, this waste heat cooling device only utilizes the engine's waste heat to provide a heat source for the refrigeration cycle system. It does not disclose how to protect the power battery under low and high temperature conditions to improve its lifespan, nor does it provide any technical guidance. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a waste heat recovery control system and method for automobile engines, which solves the problems of high energy consumption, short lifespan of power batteries, and high user costs in the prior art when automobiles are used in low and high temperature environments.

[0006] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is as follows: the automobile engine waste heat recovery control system includes an absorption refrigeration system, a battery thermal management system and an engine cooling system, wherein the inlet of the absorption refrigeration system is connected to the engine cooling system, and the outlet of the absorption refrigeration system is connected to the engine cooling system through the battery thermal management system.

[0007] The absorption refrigeration system is configured as an absorption refrigeration unit, including an evaporator, an absorber, a generator, and a condenser. The evaporator is connected to the generator through the absorber, the bottom outlet of the generator is connected to the absorber, and the top outlet of the generator is connected to the evaporator in sequence through the condenser and a throttling valve.

[0008] The battery thermal management system includes a power battery and a heat exchanger. The evaporator is connected to the heat exchanger coil via an electronic expansion valve to provide a cold source for the heat exchanger. The heat exchanger channel is connected to the cooling pipeline of the power battery via a water pump I.

[0009] The engine cooling system includes an engine, the engine's cooling pipe outlet is connected to the generator via water pump II, and the generator is connected to the engine's cooling pipe inlet via a battery thermal management system and a radiator connected in parallel.

[0010] The engine cooling system also includes a three-way valve I connected between the water pump II and the generator. The water pump II is connected to branch pipe I and branch pipe II through the three-way valve I. After the branch pipe I is connected to the generator, it converges with the branch pipe II.

[0011] The engine cooling system also includes a three-way valve II installed at the top outlet of the generator. The outlet of the three-way valve II is connected to branch pipe III and branch pipe IV, respectively. Branch pipe III is connected to the battery thermal management system, and branch pipe IV is connected to the radiator.

[0012] The power battery is equipped with a temperature sensor I, which is connected to the electronic expansion valve and the three-way valve II through a control unit to achieve low-temperature heating of the power battery.

[0013] A temperature sensor II is installed at the outlet of the engine's cooling pipe. The temperature sensor II is connected to the three-way valve I via a control unit to control the flow rate of high-temperature water entering the generator.

[0014] A method for controlling waste heat recovery from an automotive engine, utilizing the aforementioned automotive engine waste heat recovery control system, includes the following processes:

[0015] When the temperature of the water flowing out of the engine's cooling pipes is within the normal temperature range, the hot water flowing out of the engine's cooling pipes provides a heat source for the absorption refrigeration system. The water flowing out of the absorption refrigeration system flows to the battery thermal management system and / or radiator.

[0016] When the temperature of the water flowing out of the engine's cooling pipes exceeds the set high temperature, part of the high-temperature water flowing out of the engine's cooling pipes provides a heat source for the absorption refrigeration system, and the other part mixes with the water flowing out of the absorption refrigeration system and flows to the battery thermal management system and / or radiator.

[0017] The method for controlling the flow of water from the absorption refrigeration system to the battery thermal management system and / or radiator is as follows:

[0018] When the operating temperature of the power battery is within the normal temperature range, the water flowing out of the engine cooling pipes is cooled by the radiator after passing through the absorption refrigeration system.

[0019] When the operating temperature of the power battery exceeds the set high temperature, the absorption cooling system cools the power battery, and the water flowing out of the engine cooling pipe is cooled by the radiator after passing through the absorption cooling system.

[0020] When the operating temperature of the power battery is lower than the set low temperature, all the water flowing out of the engine cooling pipe enters the battery thermal management system to heat the power battery, or part of the water flowing out of the engine cooling pipe enters the battery thermal management system after passing through the absorption refrigeration system to heat the power battery, and the other part dissipates heat through the radiator.

[0021] The beneficial effects of this invention are:

[0022] 1. This invention provides a waste heat recovery control system for an automobile engine, including an absorption refrigeration system, a battery thermal management system, and an engine cooling system. The absorption refrigeration system uses hot water flowing through the engine as a driving heat source to cool the vehicle interior and the battery thermal management system. The hot water flowing through the engine can also be used directly to heat the battery, solving the problems of high energy consumption, poor battery life, and high user operating costs in the prior art when automobiles are used in low and high temperature environments.

[0023] 2. This invention connects a three-way valve I between the water pump II and the generator, diverting the hot water flowing through the engine before it enters the absorption refrigeration system. The flow rate of the hot water entering the absorption refrigeration system can be adjusted by regulating the opening of the three-way valve I. Similarly, by installing a three-way valve II between the top outlet of the generator and the battery thermal management system, the hot water flowing through the engine is diverted before entering the battery thermal management system, thus controlling the heat flowing into the power battery. Hot water that cannot be used by the absorption refrigeration system and the battery thermal management system flows to the radiator for heat dissipation. The cooled water mixes with the water flowing through the battery thermal management system and then flows back to the engine for recirculation to cool the engine. The amount of heat utilized by the battery thermal management system and the engine cooling system in this invention can be adjusted by the three-way valves I and II, achieving the rational utilization of engine waste heat.

[0024] In summary, this invention combines an absorption refrigeration system, a battery thermal management system, and an engine cooling system, utilizing only the engine's waste heat as a heat source to achieve both cooling and heating for the absorption refrigeration system and the battery thermal management system. This results in lower vehicle energy consumption, less noise, better environmental performance, and lower user operating costs. Attached Figure Description

[0025] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0026] Figure 1 This is a schematic diagram of the waste heat recovery control system for automobile engines according to the present invention;

[0027] The labels in the above diagrams are as follows: 1. Absorption refrigeration system, 11. Evaporator, 12. Absorber, 13. Generator, 14. Condenser, 2. Battery thermal management system, 21. Power battery, 22. Heat exchanger, 23. Electronic expansion valve, 24. Water pump I, 3. Engine cooling system, 31. Engine, 32. Water pump II, 33. Three-way valve I, 34. Branch pipe I, 35. Branch pipe II, 36. Three-way valve II, 37. Branch pipe III, 38. Branch pipe IV, 39. Radiator. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In existing technologies, new energy vehicles have been widely developed due to their combination of the advantages of pure electric and fuel vehicles. The thermal management systems in new energy vehicles, including the refrigeration compressor and heating system, consume electrical energy for cooling and heating. This leads to significant energy consumption in summer and winter, severely impacting the vehicle's energy efficiency in low and high temperature environments and the lifespan of the power battery, thus increasing user operating costs. This invention addresses these problems by providing a waste heat recovery control system and method for automotive engines.

[0032] The specific embodiments of the present invention are as follows: Figure 1 As shown, this invention provides a waste heat recovery control system for an automotive engine, including an absorption refrigeration system 1, a battery thermal management system 2, and an engine 31 cooling system 3. The inlet of the absorption refrigeration system 1 is connected to the engine 31 cooling system 3, allowing the absorption refrigeration system 1 to use hot water flowing through the engine 31 as a driving heat source to cool the vehicle interior and the battery thermal management system 2. The outlet of the absorption refrigeration system 1 is connected to the engine 31 cooling system 3 through the battery thermal management system 2. The power battery 21 in the battery thermal management system 2 can be cooled by the absorption refrigeration system 1 or heated by the hot water in the engine 31 cooling system 3, ensuring the reliable operation of the power battery 21 in the battery thermal management system 2 and extending the service life of the power battery 21.

[0033] Specifically, the absorption refrigeration system 1 is configured as an absorption refrigeration unit, including an evaporator 11, an absorber 12, a generator 13 and a condenser 14. The evaporator 11 is connected to the generator 13 through the absorber 12. The bottom outlet of the generator 13 is connected to the absorber 12. The top outlet of the generator 13 is connected to the evaporator 11 in sequence through the condenser 14 and a throttling valve. The absorption refrigeration system 1 uses a classic water-lithium bromide working fluid pair, with water as the refrigerant and lithium bromide as the solvent. In the evaporator 11, the refrigerant under low-pressure vacuum absorbs heat from the air conditioning water to produce water vapor. The water vapor is absorbed by the lithium bromide solution in the absorber 12, causing the concentration of the solution in the absorber 12 to decrease. The lithium bromide solution in the absorber 12 is pumped to the generator 13 for heating. The water in the solution in the generator 13 continuously vaporizes, and the concentration of the solution continuously increases. The high-concentration solution re-enters the absorber 12. The vaporized water vapor enters the condenser 14 and is cooled and condensed by the cooling water in the condenser 14. The water in the condenser 14 rapidly expands and vaporizes when passing through the throttle valve, absorbing heat from the air conditioning water in the evaporator 11, thereby obtaining low-temperature chilled water. This cycle is repeated to achieve the effect of cooling the entire vehicle interior.

[0034] Specifically, the battery thermal management system 2 includes a power battery 21 and a heat exchanger 22. Water in the condenser 14 rapidly expands and vaporizes into chilled water via a throttling valve, which then enters the evaporator 11. Simultaneously, it is throttled and cooled by an electronic expansion valve 23 before entering the heat exchange coil of the heat exchanger 22 to provide a cold source for the heat exchanger 22. The heat exchange channel of the heat exchanger 22 is connected to the cooling pipes of the power battery 21 via a water pump I 24, allowing high-temperature water in the cooling pipes to enter the heat exchange channel of the heat exchanger 22 via the water pump I 24. The high-temperature water in the heat exchange channel exchanges heat with the chilled water in the heat exchange coil. The chilled water flowing out of the heat exchanger 22, driven by the water pump I 24, flows back to the power battery 21 to cool it. The refrigerant after heat exchange returns to the absorption refrigeration system 1. The electronic expansion valve 23 is an adjustable expansion valve; adjusting the opening of the electronic expansion valve 23 controls the heat exchange capacity and outlet water temperature of the heat exchanger 22.

[0035] Specifically, the engine 31 cooling system 3 includes an engine 31. The cooling pipe outlet of the engine 31 is connected to the generator 13 via a water pump II 32, allowing high-temperature water in the cooling pipe of the engine 31 to enter the generator 13 through the water pump II 32, providing a driving heat source for the absorption refrigeration system 1. The generator 13 is connected to the cooling pipe inlet of the engine 31 via a battery thermal management system 2 and a radiator 39 connected in parallel. The vaporized water generated by the generator 13 enters the battery thermal management system 2, which can heat the power battery 21. The hot water that cannot be used by the absorption refrigeration system 1 and the battery thermal management system 2 flows to the radiator 39 for heat dissipation. The cooled water mixes with the water flowing through the battery thermal management system 2 and flows back to the engine 31 for recirculation to cool the engine 31.

[0036] The engine 31 cooling system 3 also includes a three-way valve I 33 connecting the water pump II 32 and the generator 13. The water pump II 32 is connected to branch pipes I 34 and II 35 via the three-way valve I 33. Branch pipe I 34 is connected to the generator 13 and then converges with branch pipe II 35. A temperature sensor II is installed at the outlet of the cooling pipe of the engine 31. The temperature sensor II is connected to the three-way valve I 33 via a control unit to control the flow rate of high-temperature water entering the generator 13. Because the water temperature of the engine 31 cooling system 3 is high, its waste heat utilization value is high, and it can flow to the absorption refrigeration system 1 to provide a driving heat source for the absorption refrigeration system 1. Meanwhile, when the outlet water temperature of the engine 31 cooling system 3 is too high, the absorption refrigeration system 1 cannot use so much heat. Therefore, an adjustable three-way valve I 33 is arranged before the water flows to the absorption refrigeration system 1. By adjusting the opening of the three-way valve I 33, the flow is diverted, and the hot water that the absorption refrigeration system 1 does not need is mixed with the water flowing out of the absorption refrigeration system 1 and then flows to the battery thermal management system 2 and / or radiator 39.

[0037] The aforementioned engine 31 cooling system 3 also includes a three-way valve II 36 installed at the top outlet of the generator 13. The outlet of the three-way valve II 36 is connected to branch pipe III 37 and branch pipe IV 38, respectively. Branch pipe III 37 is connected to the battery thermal management system 2, and branch pipe IV 38 is connected to the radiator 39. A temperature sensor I is installed inside the power battery 21. The temperature sensor I is connected to the electronic expansion valve 23 and the three-way valve II 36 through a control unit to achieve low-temperature heating of the power battery 21. To control the heat flowing into the power battery 21 from being too large, an adjustable three-way valve II 36 is arranged before flowing to the battery thermal management system 2. By adjusting the opening of the three-way valve II 36, the flow is diverted. When the temperature of the power battery 21 is low, it can receive the hot water from the engine 31 diverted by the three-way valve II 36, close the electronic expansion valve 23, and achieve low-temperature heating of the battery.

[0038] The hot water in the engine 31 cooling system 3 that cannot be used by the absorption refrigeration system 1 and the battery thermal management system 2 flows to the radiator 39 for heat dissipation. The cooled water mixes with the water flowing through the battery thermal management system 2 and then flows back to the engine 31 for recirculation to cool the engine 31. The amount of heat utilized by the battery thermal management system 2 and the engine 31 cooling system 3 in this invention can be adjusted by three-way valve I 33 and three-way valve II 36, which can realize the rational utilization of the waste heat of the engine 31.

[0039] The method for controlling the waste heat recovery of the automobile engine 31 using the above-mentioned automobile engine 31 waste heat recovery control system includes the following processes:

[0040] When the temperature of the water flowing out of the cooling pipes of engine 31 is within the normal temperature range, the hot water flowing out of the cooling pipes of engine 31 provides a complete heat source for the absorption refrigeration system 1. The water flowing out of the absorption refrigeration system 1 then flows to the battery thermal management system 2 and / or the radiator 39. That is, when the temperature detected by temperature sensor II is within the normal temperature range, which is defined as the range where the heat of the water flowing out of the cooling pipes of engine 31 can be completely used by the absorption refrigeration system 1, the outlet of the three-way valve I 33 to branch pipe II 35 is closed, allowing all the hot water flowing out of the cooling pipes of engine 31 to enter the absorption refrigeration system 1 for cooling. The water flowing out of the absorption refrigeration system 1 then flows to the battery thermal management system 2 and / or the radiator 39.

[0041] When the temperature of the water flowing out of the cooling pipe of engine 31 exceeds the set high temperature, part of the high-temperature water flowing out of the cooling pipe of engine 31 provides a heat source for the absorption refrigeration system 1, and the other part mixes with the water flowing out of the absorption refrigeration system 1 and flows to the battery thermal management system 2 and / or the radiator 39. That is, when the temperature detected by temperature sensor II exceeds the set high temperature, the absorption refrigeration system 1 cannot use so much heat, causing both outlets of the three-way valve I 33 to open simultaneously. By adjusting the opening of the three-way valve I 33, the flow rate of a portion of the high-temperature water entering the absorption refrigeration system 1 can meet the normal cooling requirements of the absorption refrigeration system 1, while the other part mixes with the water flowing out of the absorption refrigeration system 1 and flows to the battery thermal management system 2 and / or the radiator 39.

[0042] The control method for the water flowing out of the absorption refrigeration system 1 to the battery thermal management system 2 and / or radiator 39 is as follows:

[0043] When the operating temperature of the power battery 21 is within the normal temperature range, the water flowing out of the cooling pipe of the engine 31 is cooled by the radiator 39 after passing through the absorption refrigeration system 1. That is, when the temperature detected by the temperature sensor I is within the normal temperature range, which is calibrated as the positive operating temperature of the power battery 21, no heating or cooling is required. Therefore, the outlet of the three-way valve II 36 leading to the branch pipe III 37 is closed, allowing the water flowing out of the cooling pipe of the engine 31 to be completely cooled by the radiator 39 after passing through the absorption refrigeration system 1.

[0044] When the operating temperature of the power battery 21 exceeds the set high temperature, the absorption cooling system 1 cools the power battery 21, and the water flowing out of the cooling pipe of the engine 31 is cooled by the radiator 39 after passing through the absorption cooling system 1.

[0045] Specifically, when the temperature detected by temperature sensor I exceeds the set high temperature, the power battery 21 needs to be cooled. Electronic expansion valve 23 opens, allowing chilled water from absorption refrigeration system 1 to enter the heat exchange coil of heat exchanger 22. Hot water from the cooling pipes of power battery 21 enters the heat exchange channel of heat exchanger 22, where high-temperature water exchanges heat with chilled water in the heat exchange coil. The cold water flowing out of heat exchanger 22, driven by water pump I 24, flows back to power battery 21 to cool it. The refrigerant after heat exchange returns to absorption refrigeration system 1. Simultaneously, the outlet of three-way valve II 36 to branch pipe III 37 closes, and the outlet of three-way valve II 36 to branch pipe IV 38 opens, allowing water from engine 31 cooling pipes to be completely cooled by radiator 39 after passing through absorption refrigeration system 1.

[0046] When the operating temperature of the power battery 21 is lower than the set low temperature, all the water flowing out of the engine 31 cooling pipe enters the battery thermal management system 2 to heat the power battery 21. Alternatively, part of the water flowing out of the engine 31 cooling pipe passes through the absorption refrigeration system 1 and then enters the battery thermal management system 2 to heat the power battery 21, while the other part dissipates heat through the radiator 39. That is, when the temperature detected by temperature sensor I is lower than the set low temperature, the power battery 21 needs to be heated. Therefore, the outlet of the three-way valve II 36 leading to the branch pipe III 37 is opened, or both outlets of the three-way valve II 36 are opened simultaneously. This low temperature can be further classified into two levels: Level 1 temperature is lower than Level 2 temperature. When the operating temperature of the power battery 21 is between Level 1 and Level 2, it does not require much heat to heat up the power battery 21. At this time, both outlets of the three-way valve II 36 can be opened simultaneously, with one part heating the power battery 21 and the other part dissipating heat through the radiator 39. When the operating temperature of the power battery 21 is lower than Level 1 temperature, it requires more heat to heat up the power battery 21. At this time, the outlet of the three-way valve II 36 leading to the branch pipe III 37 is opened, and the outlet of the three-way valve II 36 leading to the branch pipe IV 38 is closed, so that the water flowing out of the engine 31 cooling pipe enters the battery thermal management system 2 after passing through the absorption refrigeration system 1 to heat up the power battery 21.

[0047] In summary, this invention combines an absorption refrigeration system, a battery thermal management system, and an engine cooling system, utilizing only the engine's waste heat as a heat source to achieve both cooling and heating for the absorption refrigeration system and the battery thermal management system. This results in lower vehicle energy consumption, less noise, better environmental performance, and lower user operating costs.

[0048] The above description is merely an illustration of some principles of the present invention. This specification is not intended to limit the present invention to the specific structures and applicable scope shown. Therefore, all possible modifications and equivalents that may be used fall within the scope of the patent application of this invention.

Claims

1. A waste heat recovery control system for an automobile engine, characterized in that, It includes an absorption refrigeration system, a battery thermal management system, and an engine cooling system. The inlet of the absorption refrigeration system is connected to the engine cooling system, and the outlet of the absorption refrigeration system is connected to the engine cooling system through the battery thermal management system. The absorption refrigeration system is configured as an absorption refrigeration unit, including an evaporator, an absorber, a generator, and a condenser. The evaporator is connected to the generator through the absorber. The bottom outlet of the generator is connected to the absorber. The top outlet of the generator is connected to the evaporator in sequence through the condenser and a throttling valve. The engine cooling system includes an engine, the engine's cooling pipe outlet is connected to the generator via water pump II, and the generator is connected to the engine's cooling pipe inlet via a battery thermal management system and a radiator connected in parallel. The engine cooling system also includes a three-way valve I connected between the water pump II and the generator. The water pump II is connected to branch pipe I and branch pipe II through the three-way valve I. After the branch pipe I is connected to the generator, it converges with the branch pipe II. The engine cooling system also includes a three-way valve II installed at the top outlet of the generator. The outlet of the three-way valve II is connected to branch pipe III and branch pipe IV, respectively. Branch pipe III is connected to the battery thermal management system, and branch pipe IV is connected to the radiator.

2. The automotive engine waste heat recovery control system according to claim 1, characterized in that: The battery thermal management system includes a power battery and a heat exchanger. The evaporator is connected to the heat exchanger coil via an electronic expansion valve to provide a cold source for the heat exchanger. The heat exchanger channel is connected to the cooling pipeline of the power battery via a water pump I.

3. The automotive engine waste heat recovery control system according to claim 2, characterized in that: The power battery is equipped with a temperature sensor I, which is connected to the electronic expansion valve and the three-way valve II through a control unit to achieve low-temperature heating of the power battery.

4. The automotive engine waste heat recovery control system according to claim 1, characterized in that: A temperature sensor II is installed at the outlet of the engine's cooling pipe. The temperature sensor II is connected to the three-way valve I via a control unit to control the flow rate of high-temperature water entering the generator.

5. A method for controlling waste heat recovery from an automotive engine, employing the waste heat recovery control system for an automotive engine as described in any one of claims 1 to 4, characterized in that: The process includes the following: When the temperature of the water flowing out of the engine's cooling pipes is within the normal temperature range, the hot water flowing out of the engine's cooling pipes provides a heat source for the absorption refrigeration system. The water flowing out of the absorption refrigeration system flows to the battery thermal management system and / or radiator. When the temperature of the water flowing out of the engine's cooling pipes exceeds the set high temperature, part of the high-temperature water flowing out of the engine's cooling pipes provides a heat source for the absorption refrigeration system, and the other part mixes with the water flowing out of the absorption refrigeration system and flows to the battery thermal management system and / or radiator.

6. The method for controlling waste heat recovery in an automotive engine according to claim 5, characterized in that: The method for controlling the flow of water from the absorption refrigeration system to the battery thermal management system and / or radiator is as follows: When the operating temperature of the power battery is within the normal temperature range, the water flowing out of the engine cooling pipes is cooled by the radiator after passing through the absorption refrigeration system. When the operating temperature of the power battery exceeds the set high temperature, the absorption cooling system cools the power battery, and the water flowing out of the engine cooling pipe is cooled by the radiator after passing through the absorption cooling system. When the operating temperature of the power battery is lower than the set low temperature, all the water flowing out of the engine cooling pipe enters the battery thermal management system to heat the power battery, or part of the water flowing out of the engine cooling pipe enters the battery thermal management system after passing through the absorption refrigeration system to heat the power battery, and the other part dissipates heat through the radiator.

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