Engine waste heat control method and device, vehicle and storage medium

Abstract

The invention discloses an engine waste heat control method and device, a vehicle and a storage medium, and the method comprises the steps that the engine mode of the vehicle is detected, and when the engine mode is a waste heat utilization mode, the current water temperature of an engine and the water temperature of a water cooling outlet of a heat exchange device are collected; when the current water temperature of the engine is greater than the water temperature of the water-cooling outlet, controlling the warm air loop to exchange heat with the engine through the heat exchange device; in the heat exchange end state of the warm air loop, the current warm air water temperature of the warm air loop, the current electric drive water temperature of the electric drive loop and the current battery water temperature of the battery loop are collected; wherein the heat exchange ending state is a state after heat exchange between the warm air loop and the engine; a target heat storage system is screened out from an electric drive loop and a battery loop according to the current warm air water temperature, the current electric drive water temperature and the current battery water temperature; and controlling the target heat storage system to exchange heat with the engine through the heat exchange device. The engine waste heat utilization rate can be increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, in particular to an engine waste heat control method and device, a vehicle and a storage medium. BACKGROUND

[0002] In a hybrid vehicle, the engine as one of the power sources will generate a large amount of heat during operation. The waste heat generated by the engine is usually used for heating the vehicle to reduce energy waste.

[0003] In related technologies, the utilization of engine waste heat mainly adopts the method of mixing engine hot water with hot water passing through a water-cooled heat exchanger to supply heat to the heating circuit. If the engine hot water temperature is too high and all the heat energy is provided to the heating circuit, the heating circuit is likely to be damaged. If only part of the heat energy is provided to the heating circuit, the engine heat energy will be excessive, and an additional heat dissipation circuit needs to be added to dissipate the heat of the engine, which not only leads to low utilization rate of engine waste heat but also increases the maintenance cost of the engine. Therefore, how to safely, effectively and cost-effectively utilize the waste heat generated by the engine has become a technical problem to be solved. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes an engine waste heat control method and device, a vehicle and a storage medium, which can safely, effectively and cost-effectively utilize the waste heat generated by the engine.

[0005] To achieve the above-mentioned purpose, a first aspect of the embodiments of the present application proposes an engine waste heat control method applied to a vehicle, wherein the vehicle comprises an engine, a heat exchange device and a waste heat utilization device, the waste heat utilization device comprises a heating circuit, an electric drive circuit and a battery circuit connected to the heat exchange device through pipelines respectively;

[0006] The method comprises:

[0007] detecting the engine mode of the vehicle, and when the engine mode is a waste heat utilization mode, collecting the current engine water temperature of the engine and the water-cooled outlet water temperature of the heat exchange device;

[0008] when the current engine water temperature is greater than the water-cooled outlet water temperature, controlling the heating circuit and the engine to exchange heat through the heat exchange device;

[0009] collecting the current heating water temperature of the heating circuit, the current electric drive water temperature of the electric drive circuit and the current battery water temperature of the battery circuit in the heat exchange end state of the heating circuit; wherein the heat exchange end state is the state after the heating circuit exchanges heat with the engine;

[0010] screening a target heat storage system from the electric drive loop and the battery loop according to the current water temperature of the heater, the current water temperature of the electric drive and the current water temperature of the battery;

[0011] controlling the target heat storage system and the engine to exchange heat through the heat exchange device.

[0012] In some embodiments, the screening a target heat storage system from the electric drive loop and the battery loop according to the current water temperature of the heater, the current water temperature of the electric drive and the current water temperature of the battery comprises:

[0013] when the current water temperature of the heater is greater than a preset heater threshold, screening a preliminary heat storage system from the electric drive loop and the battery loop according to the current water temperature of the electric drive, a preset electric drive target water temperature, the current water temperature of the battery and a preset battery target water temperature;

[0014] controlling the preliminary heat storage system and the engine to exchange heat through the heat exchange device, and collecting an updated water temperature of the electric drive loop and an updated water temperature of the battery loop;

[0015] adjusting the preliminary heat storage system according to the updated water temperature of the electric drive, the updated water temperature of the battery, the electric drive target water temperature and the battery target water temperature to obtain the target heat storage system.

[0016] In some embodiments, the screening a preliminary heat storage system from the electric drive loop and the battery loop according to the current water temperature of the heater, the current water temperature of the electric drive, a preset electric drive target water temperature, the current water temperature of the battery and a preset battery target water temperature when the current water temperature of the heater is greater than a preset heater threshold comprises:

[0017] when the current water temperature of the heater is greater than a preset heater threshold, and the current water temperature of the electric drive is less than the electric drive target water temperature, taking the electric drive loop as the preliminary heat storage system;

[0018] when the current water temperature of the heater is greater than a preset heater threshold, the current water temperature of the electric drive is greater than the electric drive target water temperature, and the current water temperature of the battery is less than the electric drive target water temperature, taking the battery loop as the heat storage system.

[0019] In some embodiments, the vehicle further comprises a compressor, and after the detecting the engine mode of the vehicle and when the engine mode is the waste heat utilization mode, collecting the current water temperature of the engine and the water outlet water temperature of the heat exchange device, the method further comprises:

[0020] when the current water temperature of the engine is less than or equal to the water outlet water temperature of the heat exchange device, combining the engine and the compressor into a target heat supply system;

[0021] controlling the heat exchange between the warm air circuit and the target heating system through the heat exchange device.

[0022] In some embodiments, the waste heat utilization mode determination process is:

[0023] detecting an engine operating state of the engine and an air conditioning operating mode of the vehicle;

[0024] when the engine operating state is a start state and the air conditioning operating mode is a heating mode, collecting a water pump rotating speed of the engine and an initial engine water temperature;

[0025] when the water pump rotating speed is greater than a set rotating speed and the initial engine water temperature is less than a set water temperature threshold, determining that the engine mode of the vehicle is the waste heat utilization mode.

[0026] In some embodiments, the vehicle further comprises a compressor, and the method further comprises:

[0027] when the engine operating state is a stop state, the air conditioning operating mode is a heating mode, and the initial engine water temperature is greater than a preset waste heat recovery water temperature, controlling the heat exchange between the warm air circuit and the engine through the heat exchange device;

[0028] in an end state of the heat exchange of the warm air circuit, collecting a warm air updated water temperature of the warm air circuit, and selecting an updated heating system from the compressor and the engine according to the warm air updated water temperature and a preset warm air water temperature threshold;

[0029] controlling the heat exchange between the warm air circuit and the updated heating system through the heat exchange device.

[0030] In some embodiments, the vehicle further comprises a heat dissipation device arranged on the engine, and the method further comprises:

[0031] when the engine mode is a heat dissipation mode, collecting a heat energy storage state of the electric drive circuit and the battery circuit;

[0032] if the heat energy storage state is a heat energy not full state, combining the heat dissipation device and the waste heat utilization device into a heat dissipation system;

[0033] controlling the heat exchange between the heat dissipation system and the engine through the heat exchange device.

[0034] To achieve the above-mentioned purpose, a second aspect of the embodiment of the present application proposes an engine waste heat control device, the device is arranged in a vehicle, the vehicle comprises an engine, a heat exchange device and a waste heat utilization device, the waste heat utilization device comprises a warm air circuit, an electric drive circuit and a battery circuit connected to the heat exchange device through pipelines respectively;

[0035] The device comprises:

[0036] The first acquisition module is configured to detect an engine mode of the vehicle, and acquire an engine current water temperature of the engine and a water cooling outlet water temperature of the heat exchange device when the engine mode is a waste heat utilization mode.

[0037] The heating and heat exchange module is configured to control the heating circuit and the engine to exchange heat through the heat exchange device when the engine current water temperature is greater than the water cooling outlet water temperature.

[0038] The second acquisition module is configured to acquire a heating current water temperature of the heating circuit, an electric drive current water temperature of the electric drive circuit, and a battery current water temperature of the battery circuit in an end state of heat exchange of the heating circuit, wherein the end state of heat exchange is a state after the heating circuit and the engine exchange heat.

[0039] The heat storage screening module is configured to screen a target heat storage system from the electric drive circuit and the battery circuit according to the heating current water temperature, the electric drive current water temperature, and the battery current water temperature.

[0040] The heat storage and heat exchange module is configured to control the target heat storage system and the engine to exchange heat through the heat exchange device.

[0041] To achieve the above object, a third aspect of the embodiments of the present application provides a vehicle, comprising a vehicle controller and a memory connected to the vehicle controller; the memory stores instructions executable by the vehicle controller, and the instructions are executed by the vehicle controller to enable the vehicle controller to execute the engine waste heat control method according to the first aspect.

[0042] To achieve the above object, a fourth aspect of the embodiments of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the engine waste heat control method according to the first aspect.

[0043] The engine waste heat control method and device, vehicle and storage medium provided by the application, when the engine mode of the vehicle is the waste heat utilization mode, the current engine water temperature and the water cooling outlet water temperature are collected, when the current engine water temperature is greater than the water cooling outlet water temperature, the heating circuit and the engine are controlled to exchange heat first. Then the current water temperature of the heating circuit after heat exchange is collected, and the current electric drive temperature of the electric drive circuit and the current battery temperature of the battery circuit are collected, the target heat storage system that can further store heat is selected from the electric drive circuit and the battery circuit according to the current water temperature of the heating circuit, the current electric drive temperature and the current battery temperature, and heat exchange is performed between the target heat storage system and the engine. Therefore, when the engine generates waste heat, if the engine hot water temperature is too high, the excess heat energy is provided to the electric drive circuit or the battery circuit to increase the utilization rate of the engine waste heat, and the safety of the heating circuit is improved, and the maintenance cost of the engine is reduced.

[0044] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a heat management schematic diagram of engine waste heat without utilization;

[0046] Figure 2 is a heat management schematic diagram of the heating circuit, the engine and the compressor for heat exchange;

[0047] Figure 3 is a heat management schematic diagram of the heating circuit and the engine for heat exchange;

[0048] Figure 4 is a heat management schematic diagram of the heating circuit, the electric drive circuit and the engine for heat exchange;

[0049] Figure 5 is a heat management schematic diagram of the heating circuit, the battery circuit and the engine for heat exchange;

[0050] Figure 6 is a heat management schematic diagram of the heating circuit, the electric drive circuit, the battery circuit and the engine for heat exchange;

[0051] Figure 7 is a flowchart of the engine waste heat control method provided by the embodiment of the application;

[0052] Figure 8 is Figure 7 is a flowchart of the waste heat utilization mode determination process in step S701 in

[0053] Figure 9 is a flowchart of the engine waste heat control method provided by another embodiment of the application;

[0054] Figure 10 is Figure 7 a flow chart of step S704 in

[0055] Figure 11 is Figure 10 a flow chart of step S1003 in

[0056] Figure 12 is a flow chart of an engine waste heat control method provided by another embodiment of the present application;

[0057] Figure 13 is a flow chart of an engine waste heat control method provided by another embodiment of the present application;

[0058] Figure 14 is a thermal management schematic diagram of engine waste heat recovery after engine shutdown;

[0059] Figure 15 is a flow chart of an engine waste heat control method provided by an embodiment of the present application;

[0060] Figure 16 is a structural schematic diagram of an engine waste heat control device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0062] It should be noted that although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flow chart, in some cases, the steps shown or described can be executed in a manner different from the module division in the device or the order in the flow chart. The terms "first", "second", etc. in the specification and claims and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0064] Glossary:

[0065] Heat exchanger: Heat exchange refers to the transfer of heat through a heat exchanger. Heat exchanger is a device that transfers part of the heat of hot fluid to cold fluid, also known as heat exchanger.

[0066] Waste heat utilization: refers to the waste heat energy in industrial production, energy conversion, and even daily life that is not utilized and discharged into the environment. Through technical means, it is recovered and used for other useful processes.

[0067] Liquid-cooled battery system: effectively manage battery temperature through liquid circulation, improve battery performance and safety, widely used in electric vehicles and energy storage systems. Batteries generate heat (Joule heat and reaction heat) during charging and discharging due to internal chemical reactions and internal resistance. Purely relying on air cooling (air cooling) cannot meet the high-power charging and discharging requirements of high-energy-density battery packs, so liquid cooling technology with higher heat dissipation efficiency and better temperature uniformity becomes an inevitable choice.

[0068] Chiller: a device used for cooling and temperature control. It is a machine that reduces the temperature of the environment through the circulation of refrigerant, also known as a water chiller or air conditioning unit.

[0069] Four-way proportional valve: a very critical and advanced fluid control element that integrates the flow path switching function of the "four-way valve" and the precise adjustment ability of the "proportional valve". Most commonly used in complex thermal management systems (HVAC, heat pumps, new energy vehicle thermal management) and hydraulic systems.

[0070] In hybrid vehicles, the engine serves as one of the power sources and generates a large amount of heat energy during operation, also known as engine waste heat. When the vehicle is in a certain specific working condition (for example, the vehicle SOC is high and the engine does not need to be started for a short time), the engine waste heat is usually not utilized and wasted. Therefore, in order to reduce the waste of engine waste heat, it is attempted to provide the heat energy generated by the engine to the vehicle interior heating, which not only realizes heat energy recovery, but also saves energy consumption for preparing heat energy in the vehicle.

[0071] In related technologies, engine waste heat utilization mainly provides heat to the heating air circuit by mixing engine hot water with hot water passing through a water-cooled heat exchanger. However, when the engine hot water temperature is too high, it is directly provided to the heating air circuit, which can easily damage the heating air circuit. If only part of the engine hot water is diverted, the remaining engine waste heat is excessive, resulting in low engine waste heat utilization rate.

[0072] Based on this, embodiments of this application provide an engine waste heat control method and device, a vehicle, and a storage medium. When the engine is in waste heat utilization mode, the current engine coolant temperature and the water-cooled outlet temperature are collected. When the current engine coolant temperature is higher than the water-cooled outlet temperature, it indicates that the engine temperature is too high, but the heating target of the heater circuit can be met. Heat exchange is controlled between the heater circuit and the engine through a heat exchange device. After heat exchange in the heater circuit, the current coolant temperature of the heater circuit, the current coolant temperature of the electric drive circuit, and the current coolant temperature of the battery are further collected. Based on the current coolant temperature of the heater circuit, the current coolant temperature of the electric drive circuit, and the current coolant temperature of the battery, a target energy storage system is selected from the electric drive circuit and the battery circuit. The target energy storage system stores the engine's residual heat energy, which not only avoids the engine coolant temperature from being directly introduced into the heater circuit when it is too high, but also improves the safety of the heater circuit when waste heat is utilized. When there is too much waste heat, heat energy is stored through the electric drive circuit and / or the battery circuit to reduce heat loss and improve the utilization rate of engine waste heat.

[0073] The engine waste heat control method provided in this application is specifically illustrated through the following embodiments. The engine waste heat control method is applied to a vehicle, which includes an engine, a heat exchanger, and a waste heat utilization device. The waste heat utilization device includes a heating circuit, an electric drive circuit, and a battery circuit, each connected to the heat exchanger via pipes. It should be noted that the engine and the heat exchanger are connected in series via pipes, and the heat exchanger is connected in series with the heating circuit, the electric drive circuit, and the battery circuit via pipes. Figure 1 As shown, the vehicle in this embodiment also includes a compressor ACCM, a nine-way valve MMV, a water-cooled condenser WCDS, and a condenser heat exchanger Chiller. The nine-way valve MMV is connected in series with the heating circuit, the electric drive circuit, and the battery circuit via pipes. One end of the compressor ACCM is connected to the heating circuit via a pipe, and the other end is connected to one end of the water-cooled condenser WCDS via a pipe. The other end of the water-cooled condenser WCDS is connected to one end of the condenser heat exchanger Chiller and the heating circuit via a pipe. The other end of the condenser heat exchanger Chiller is connected to the compressor ACCM. Therefore, a water circulation system is formed by the compressor ACCM, the water-cooled condenser WCDS, and the condenser heat exchanger Chiller to generate heat energy to supply the heating circuit. At the same time, the nine-way valve MMV can be controlled to switch between hot water from the engine or water from the water-cooled condenser WCDS along the electric drive circuit, the battery circuit, and the heating circuit, achieving effective utilization of engine waste heat.

[0074] like Figure 1 As shown, Figure 1The heat management schematic diagram without utilizing the engine waste heat is shown. When the air conditioner operating mode is in the heating mode, the hot water of the engine does not flow to the heating air circuit, the electric drive circuit and the battery circuit, the compressor ACCM is started and drives the water-cooled condenser WCDS, the condenser chiller and the drive circuit to operate to generate heat energy to provide the heating air circuit. Therefore, when the engine waste heat is not controlled, the temperature of the engine is too high, and an additional heat dissipation device needs to be set to dissipate heat, which not only wastes the heat energy generated by the engine, but also increases the maintenance cost of the engine.

[0075] In some embodiments, the heat exchange device of the present embodiment comprises a first heat exchanger CCHX1, a second heat exchanger CCHX2, a first three-way proportional valve HCTV, a second three-way proportional valve BCTV1, a third three-way proportional valve BCTV2 and a four-way proportional valve LIN, the first heat exchanger CCHX1 is connected to the electric drive circuit, the engine and the second heat exchanger CCHX2 through a pipeline, the second heat exchanger CCHX2 is connected to the engine, the first heat exchanger CCHX1 and the four-way proportional valve LIN through a pipeline. The first three-way proportional valve HCTV is connected to the heating air circuit, the nine-way valve MMV and the four-way proportional valve LIN through a pipeline, and the second three-way valve BCTV1 is connected to the electric drive circuit, the nine-way valve MMV and the third three-way proportional valve BCTV2 through a pipeline.

[0076] Further, as shown in Figure 1 The main equipment of the heating air circuit is the evaporator EVAP, the heating air blower Blower_HW and the heating air core WARM CORE. After the hot water of the engine flows to the heating air core WARM CORE, the evaporator EVAP evaporates the hot water, and then the heated air is blown into the vehicle through the heating air blower Blower_HW. The main equipment of the battery circuit is the battery pump BCPF, which is the power element of the battery heat cycle and is responsible for pushing the hot water to circulate in the battery circuit to store heat energy. The main equipment of the electric drive circuit is the transmission oil cooling heat exchanger TOC, the motor controller PCM, the intelligent driving module ADCU, the electric drive water pump EDCP and the intercooler WCAC. After the hot water is controlled to flow to the electric drive water pump EDCP through the nine-way valve MMV, it flows into the intercooler WCAC, the motor controller PCM and the transmission oil cooling heat exchanger TOC, respectively, and at the same time, the hot water flows into the intelligent driving module ADCU, and finally flows back to the engine, realizing heat exchange between the drive circuit and the engine.

[0077] Figure 2 and Figure 3 as shown, Figure 2 The heat management schematic diagram of the engine and the compressor combined into the target heat supply system and the heating air circuit for heat exchange is shown, Figure 3 The heat management schematic diagram of the engine alone and the heating air circuit for heat exchange is shown. Through Figure 2 andFigure 3 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine.

[0078] As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine. Figure 4 Figure 4 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine. Figure 4 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine.

[0079] Figure 5 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine. Figure 5 Figure 5 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine.

[0080] As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine. Figure 6 Figure 6 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine. Figure 6 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine.

[0081] Figures 2 to 6 As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine.

[0082] As shown in FIG. 6, the heat management principle diagram of the warm air circuit, the battery circuit and the engine is shown. As shown in FIG. 6, if the battery circuit exchanges heat with the engine, the hot water of the engine flows along the first heat exchanger CCHX1, the four-way proportional valve LIN and the nine-way valve MMV, and then the hot water of the battery circuit flows out of the nine-way valve MMV, and then the hot water flows along the first three-way proportional valve HCTV and the first heat exchanger CCHX1, and then the hot water flows into the engine, so as to realize the heat exchange between the battery circuit and the engine. Figure 7 ​​​​​As shown, the engine waste heat control method provided by the embodiments of the present application is specifically described by the following embodiments. Next, the engine waste heat control method in the embodiments of the present application is described.

[0083] Please refer to Figure 7 , Figure 7 A flowchart of an engine waste heat control method is shown, which can include but is not limited to steps S701 to S705:

[0084] Step S701, detecting the engine mode of the vehicle, and when the engine mode is the waste heat utilization mode, collecting the current engine water temperature of the engine and the water cooling outlet water temperature of the heat exchange device;

[0085] Step S702, when the current engine water temperature is greater than the water cooling outlet water temperature, controlling the heat exchange between the engine and the heating air circuit through the heat exchange device;

[0086] Step S703, collecting the current heating air water temperature of the heating air circuit, the current electric drive water temperature of the electric drive circuit, and the current battery water temperature of the battery circuit in the heat exchange end state of the heating air circuit; wherein the heat exchange end state is the state after the heat exchange between the heating air circuit and the engine;

[0087] Step S704, selecting a target heat storage system from the electric drive circuit and the battery circuit according to the current heating air water temperature, the current electric drive water temperature, and the current battery water temperature;

[0088] Step S705, controlling the heat exchange between the target heat storage system and the engine through the heat exchange device.

[0089] The steps S701 to S705 shown in the embodiments of the present application, by detecting that the engine mode of the vehicle is the waste heat utilization mode, first collecting the current engine water temperature and the water cooling outlet water temperature of the heat exchange device, when the current engine water temperature is greater than the water cooling outlet water temperature, indicating that the engine water temperature is in a rich state, controlling the heat exchange between the engine and the heating air circuit through the heat exchange device. After the heat exchange of the heating air circuit ends, further collecting the current heating air water temperature of the heating air circuit, the current drive water temperature of the drive circuit, and the current battery water temperature of the battery circuit. Select the target energy storage system that can further exchange heat with the engine from the drive circuit and the battery circuit according to the current heating air water temperature, the current drive water temperature, and the current battery water temperature. Therefore, when the engine generates rich heat energy, the heat energy is first provided to the heating air circuit, and then the heat energy generated by the engine is controlled to enter the drive circuit and / or the battery circuit according to the water temperature of the heating air circuit, the water temperature of the drive circuit, and the water temperature of the battery circuit, realizing the hierarchical utilization of the engine waste heat, not only avoiding the direct passage of high-temperature water from the engine to the heating air circuit to improve the safety of the heating air circuit, but also realizing the effective recovery of the engine heat energy, reducing energy waste, and improving the waste heat utilization rate.

[0090] In step S701 of some embodiments, the engine mode of the vehicle is detected, i.e., the maintenance mode of the engine is determined. In the present embodiment, the engine mode includes a waste heat utilization mode, a heat storage mode, and a heat dissipation mode. The waste heat utilization mode represents that the air conditioning operation mode is a heating mode, and the heat energy generated by the engine can be utilized. When the waste heat utilization mode is entered, the water cooling circulation system on the engine is started, and the hot water flowing out of the water cooling circulation system is flowed into the waste heat utilization device to realize the utilization of the engine waste heat. The heat storage mode represents that the engine waste heat is excessive, and heat storage can be performed. The heat dissipation mode represents that the engine temperature is excessively high, which will affect the service life of the engine, and the engine needs to be cooled by an additional heat dissipation device to reduce the temperature of the engine.

[0091] Further, when the engine mode is determined to be the waste heat utilization mode, the engine current water temperature of the engine and the water cooling outlet water temperature of the heat exchange device need to be collected. It should be noted that the engine current water temperature is the water temperature after the water cooling circulation system flows through the engine, and a temperature detector can be arranged on the output pipeline of the water cooling circulation system to determine the engine current water temperature. The water cooling outlet water temperature of the heat exchange device represents the water temperature at the output port of the pipeline after the hot water flows into the heat exchange device, and the water temperature flowing into the heat exchange device is the water cooling inlet water temperature. The engine current water temperature and the water cooling outlet water temperature can be used to determine whether the engine heat energy meets the warm air requirement temperature of the warm air circuit.

[0092] In some embodiments, please refer to Figure 8 , the waste heat utilization mode determination process in step S701 can include but is not limited to steps S801 to S803:

[0093] Step S801, detecting the engine operation state of the engine and the air conditioning operation mode of the vehicle;

[0094] Step S802, when the engine operation state is a starting state and the air conditioning operation mode is a heating mode, collecting the water pump rotating speed of the engine and the initial water temperature of the engine;

[0095] Step S803, when the water pump rotating speed is greater than the set rotating speed and the initial water temperature of the engine is less than the set water temperature threshold, determining that the engine mode of the vehicle is the waste heat utilization mode.

[0096] In steps S801 to S802 of some embodiments, the engine operating state and the air conditioner operating mode are detected. When the engine operating state is the starting state and the air conditioner operating mode is the heating mode, it indicates that the engine is started and there is a demand for warm air, and it is necessary to further determine whether the waste heat generated by the engine can be utilized. Therefore, the water pump speed of the engine and the initial engine water temperature are collected. It should be noted that the water pump speed is the water pump speed of the water cooling circulation system of the engine, and the initial engine water temperature is the water temperature after the engine is started for a period of time, which is also the water temperature when the engine operating state is the starting state and the air conditioner operating mode is the heating mode.

[0097] In step S803 of some embodiments, the water pump speed is compared with the set speed, and the initial engine water temperature is compared with the set water temperature threshold. If the water pump speed is greater than the set speed and the engine water temperature is less than the set water temperature threshold, it is determined that the engine operating mode is the waste heat utilization mode. It should be noted that the set water temperature threshold represents the maximum temperature value that the engine can withstand, and the set water temperature threshold can also be self-defined or set according to historical engine operating data. If the set water temperature threshold is set according to the historical engine water temperature data, the historical water temperature data before the engine failure is collected, and the maximum water temperature that the engine can withstand is determined as the set water temperature threshold according to the historical water temperature data. Therefore, when the engine is started and there is a demand for warm air, the engine water pump speed is too fast, and the engine water temperature is within the high temperature that the engine can withstand, it can be determined that the engine operating mode is the waste heat utilization mode, and it is determined that the waste heat generated by the engine can be utilized.

[0098] In steps S801 to S803 of the embodiment, when it is determined that the engine operating state is the starting state and the air conditioner operating mode is the heating mode, the water pump speed of the engine and the initial engine water temperature are collected, so that when the water pump speed is greater than the set speed and the initial engine water temperature is less than the set water temperature threshold, the engine operating mode is determined to be the waste heat utilization mode, thereby realizing accurate setting of the waste heat utilization mode.

[0099] In some embodiments, please refer to Figure 9 After step S701, the engine waste heat control method can further include but is not limited to steps S901 to S902:

[0100] In step S901, the engine and the compressor are combined into a target heating system when the current engine water temperature is less than or equal to the water cooling outlet water temperature.

[0101] In step S902, the heat exchange device controls the heat exchange between the warm air circuit and the target heating system.

[0102] In step S901 of some embodiments, the current engine coolant temperature and the water-cooled outlet temperature are compared. If the current engine coolant temperature is lower than the water-cooled outlet temperature, it indicates that the waste heat generated by the engine is insufficient. In related technologies, if the current engine coolant temperature is lower than the water-cooled outlet temperature, the heat energy generated by the engine cannot be utilized. However, if the current engine coolant temperature is higher than the water-cooled inlet temperature, it indicates that the heat energy generated by the engine can still be utilized. Therefore, in order to achieve effective utilization of engine waste heat, when the current engine coolant temperature is insufficient, the compressor and engine are combined into a target heating system, with the engine and compressor jointly supplying heat to the warm air circuit.

[0103] In step S902 of some embodiments, such as Figure 2 As shown, when the engine coolant temperature is insufficient, the four-way proportional valve LIN adjusts to the first mode, and the compressor starts. Figure 2 The first mode represents the four-way proportional valve LIN with ports 1 and 3 connected, and ports 2 and 4 connected. Therefore, heat exchange occurs between the heating circuit and the target heating system. Specifically, the engine's hot water flows to the first heat exchanger CCHX1 in the heat exchange device, then flows along the pipe connected to ports 2 and 4 to the compressor, and then along the compressor to the heating circuit. It should be noted that there is a hot water circulation between the compressor and the drive circuit; the water is further heated after flowing to the compressor before flowing to the heating circuit. Once the water reaches the heating circuit, the cold water in the heating circuit flows back to the engine along the pipe connected to ports 3 and 1, thus achieving heat exchange between the heating circuit and the engine.

[0104] It should be noted that the compressor operates primarily based on a preset heating threshold; that is, the closed-loop target of the compressor's speed closed-loop control algorithm is the preset heating threshold. The preset heating threshold is the sum of the target water temperature in the heating circuit and the preset threshold. When hot water flows into the heating circuit, the current water temperature in the heating circuit can reach the preset heating threshold.

[0105] In steps S901 to S902 of this embodiment, when the engine is not generating enough heat, the compressor and the engine are controlled to supply heat to the heating circuit together, so as to make the waste heat utilization efficiency of the engine higher.

[0106] In step 702 of some embodiments, if the current engine coolant temperature is higher than the coolant outlet temperature, it indicates that the engine is generating sufficient heat energy to meet the target coolant temperature for the heating circuit. Therefore, heat exchange between the heating circuit and the engine is controlled by a heat exchange device. Figures 3 to 6 As shown, by adjusting the four-way proportional valve LIN to the first mode, heat exchange between the heater circuit and the engine can be achieved through the first heat exchanger CCHX1. Simultaneously, since the current engine coolant temperature meets the target coolant temperature for the heater circuit, it can be determined that after heat exchange, the current coolant temperature of the heater circuit is greater than the target coolant temperature, thus controlling the compressor to shut down.

[0107] In step S703 of some embodiments, when the warm air circuit is in the heat exchange end state, the current warm air water temperature of the warm air circuit is collected, and the engine water temperature state can be determined by the current warm air water temperature. At the same time, the current drive water temperature of the drive circuit and the current battery water temperature of the battery circuit are collected, and the energy storage system when the engine water temperature is in the water temperature sufficient state can be determined by the current drive water temperature and the current battery water temperature.

[0108] It should be noted that the engine water temperature state includes a water temperature insufficient state, a water temperature balanced state and a water temperature sufficient state. The water temperature insufficient state indicates that the heat energy generated by the engine is insufficient to meet the heat energy demand of the warm air circuit. The water temperature balanced state indicates that the heat energy generated by the engine is just enough to meet the heat energy demand of the warm air circuit. The water temperature sufficient state indicates that the heat energy generated by the engine has a surplus after being provided to the warm air circuit, which can be provided to the drive circuit and / or the battery circuit.

[0109] In some embodiments, please refer to Figure 10 Step S704 can include but is not limited to steps S1001 to S1003:

[0110] Step S1001, when the current warm air water temperature is greater than the preset warm air threshold value, the preliminary heat storage system is selected from the drive circuit and the battery circuit according to the current electric drive water temperature, the preset electric drive target water temperature, the current battery water temperature and the preset battery target water temperature;

[0111] Step S1002, the preliminary heat storage system and the engine are controlled to exchange heat by the heat exchange device, and the updated electric drive water temperature of the drive circuit and the updated battery water temperature of the battery circuit are collected;

[0112] Step S1003, the preliminary heat storage system is adjusted according to the updated electric drive water temperature, the updated battery water temperature, the electric drive target water temperature and the battery target water temperature, and the target heat storage system is obtained.

[0113] In step S1001 of some embodiments, when the current water temperature of the warm air is greater than the preset warm air threshold value, the engine water temperature state is represented as a water temperature surplus state, the heat energy generated by the engine not only meets the heat energy demand of the warm air circuit, but also can be stored, so the engine mode is switched to a heat storage mode. It should be noted that the heat storage mode includes an electric drive heat storage mode and / or a battery heat storage mode. In this embodiment, the preset warm air threshold value is the sum of the target water temperature of the warm air and a preset threshold value, and the difference between the actual water temperature of the warm air circuit and the target water temperature of the warm air is greater than the preset threshold value, which can ensure that there is still engine waste heat after heat exchange of the warm air circuit. For example, if the target water temperature of the warm air is WS, the current water temperature of the warm air is W1, and the preset threshold value is 10°C, if W1> WS+10°C, it is determined that the engine mode is a heat storage mode. In the heat storage mode, the current water temperature of the electric drive and the preset target water temperature of the electric drive are compared to determine the heat storage indication information of the electric drive circuit, and the current water temperature of the battery and the preset target water temperature of the battery are compared to determine the heat storage indication information of the battery circuit. Therefore, according to the heat storage indication information of the electric drive circuit and the battery circuit, a preliminary heat storage system can be determined, and the preliminary heat storage system is used to share the waste heat recovery work of the warm air circuit, so as to realize the hierarchical recovery of engine waste heat.

[0114] It should be noted that the preset target water temperature of the electric drive is a water temperature limit value of the electric drive circuit, and the preset target water temperature of the battery is a water temperature limit value of the battery circuit. When the current water temperature of the electric drive exceeds the target water temperature of the electric drive, the operation state of the electric drive circuit will be affected, and when the current water temperature of the battery exceeds the target water temperature of the battery, the operation state of the battery circuit will be affected.

[0115] In step S1002 of some embodiments, the preliminary heat storage system is any one of the electric drive circuit and the battery circuit, so after heat exchange between the preliminary heat storage system and the engine, the updated water temperature of the electric drive circuit and the updated water temperature of the battery circuit are collected after heat exchange of the preliminary heat storage system, so as to determine whether there is still engine waste heat according to the updated water temperature of the electric drive and the updated water temperature of the battery, and to further store heat.

[0116] In step S1003 of some embodiments, the updated water temperature of the electric drive and the target water temperature of the electric drive are further compared, and the updated water temperature of the battery and the target water temperature of the battery are compared to determine whether the preliminary heat storage system needs to be further adjusted to obtain a new target heat storage system.

[0117] According to the first comparison information and the second comparison information, the heat storage system is screened from the electric drive circuit and the battery circuit, that is, the heat storage system is screened according to the heat storage indication information of the electric drive circuit and the heat storage indication information of the battery circuit.

[0118] In steps S1001-S1003 shown in the embodiment, when the current water temperature of the heater core is greater than the preset heater core threshold value, it is determined that the engine mode is the energy storage mode, and the engine waste heat is stored. The storage instruction information is determined according to the current water temperature of the battery circuit and the electric drive circuit, that is, the electric drive circuit and / or the battery circuit are selected as the preliminary energy storage system, the engine waste heat is exchanged through the preliminary energy storage system, and then the updated water temperature of the electric drive and the updated water temperature of the battery are obtained to further adjust the preliminary energy storage system to obtain the target energy storage system, so as to realize effective utilization of the waste heat.

[0119] In some embodiments, if the current water temperature of the heater core is less than the preset heater core threshold value, and the difference between the current water temperature of the heater core and the target water temperature of the heater core is greater than the preset difference value, and the preset difference value is less than the preset threshold value. Specifically, if the preset difference value is 5℃, that is, WS+5℃<WI<WS+10℃, it is determined that the engine water temperature state is the water temperature balance state, which indicates that the engine waste heat can only meet the heat demand of the heater core circuit, and the compressor does not need to be started. Specifically, as shown in Figure 3 , the four-way proportional valve is adjusted to the first mode, the heater core circuit and the engine are exchanged through the first heat exchanger CCHX1, and effective waste heat recovery is realized.

[0120] In some embodiments, referring to Figure 11 , step S1003 can include but is not limited to steps S1101-S1102:

[0121] Step S1101, when the current water temperature of the heater core is greater than the preset heater core threshold value, and the current water temperature of the electric drive circuit is less than the target water temperature of the electric drive circuit, the electric drive circuit is selected as the preliminary heat storage system.

[0122] Step S1102, when the current water temperature of the heater core is greater than the preset heater core threshold value, the current water temperature of the electric drive circuit is greater than the target water temperature of the electric drive circuit, and the current water temperature of the battery circuit is less than the target water temperature of the electric drive circuit, the battery circuit is selected as the heat storage system.

[0123] In step S1101 of some embodiments, in the embodiment, the priority of the electric drive heat storage mode is higher than that of the battery heat storage mode, so when the current water temperature of the heater core is greater than the preset heater core threshold value, and the current water temperature of the electric drive circuit is less than or equal to the target water temperature of the electric drive circuit, the current water temperature of the battery circuit does not need to be considered, and the electric drive circuit is directly selected as the preliminary energy storage system. Therefore, the electric drive circuit and the engine are exchanged through the heat exchange device.

[0124] Specifically, as shown in Figure 4As shown, when the electric drive circuit and the engine exchange heat, the four-way proportional valve is adjusted to the first mode, the engine and the warm air circuit exchange heat through the first heat exchanger CCHX1, at the same time, the third three-way proportional valve BCTV2 opens the second heat exchanger CCHX2 to exchange heat between the engine and the electric drive circuit, until the electric drive updated water temperature is greater than the electric drive target water temperature. In this embodiment, the electric drive target water temperature is 45°C, that is, when the electric drive updated water temperature is greater than 45°C, the heat exchange of the electric drive circuit is completed.

[0125] In step S1102 of some embodiments, when the warm air current water temperature is greater than the preset warm air threshold value, and the electric drive current water temperature is greater than the electric drive target water temperature, and the battery current water temperature is less than or equal to the battery target water temperature, it is represented that the electric drive circuit cannot store heat, but the battery circuit can store heat, so the battery circuit is used as the preliminary heat storage system.

[0126] It should be noted that when the battery circuit is used as the preliminary heat storage system, as shown, the four-way proportional valve is adjusted to the first mode, the engine and the warm air circuit exchange heat through the first heat exchanger CCHX1, at the same time, the nine-way valve MMV opens the hot water of the engine to flow into the battery circuit, so that the battery circuit and the engine exchange heat, until the battery updated water temperature reaches the battery target water temperature. Figure 5

[0127] In the steps S1101 to S1102 shown in this embodiment, by comparing the electric drive current water temperature and the electric drive target water temperature, and comparing the battery current water temperature and the battery target water temperature, the electric drive circuit or the battery circuit is selected as the preliminary heat storage system, and the engine waste heat is stored by the preliminary heat storage system to assist the warm air circuit, so that the engine waste heat is effectively utilized.

[0128] In step S1003 of some embodiments, in this embodiment, if the preliminary heat storage system is the electric drive circuit, the electric drive updated water temperature is first collected from the electric drive circuit, and the electric drive updated water temperature and the electric drive target water temperature are compared to determine whether there is still engine waste heat. If the electric drive updated water temperature is greater than the electric drive target water temperature, the battery updated water temperature of the battery circuit is collected, and if the battery updated water temperature is less than the battery target water temperature, the electric drive circuit and the battery circuit are combined to form the target heat storage system. Similarly, if the preliminary heat storage system is the battery circuit, the battery updated water temperature is first collected from the battery circuit, and the battery updated water temperature and the battery target water temperature are compared to determine whether there is still engine waste heat. If the battery updated water temperature is greater than the battery target water temperature, the electric drive updated water temperature of the electric drive circuit is collected, and if the electric drive updated water temperature is less than the electric drive target water temperature, the electric drive circuit and the battery circuit are combined to form the target heat storage system.

[0129] ​Further, if the electric drive loop is the preliminary heat storage system, and the electric drive updated water temperature is less than or equal to the electric drive target water temperature, the electric drive loop continues to be the target heat storage system. Similarly, if the battery loop is the preliminary heat storage system, and the battery updated water temperature is less than or equal to the battery target water temperature, the battery loop continues to be the target heat storage system.

[0130] As shown in Figure 6 , when the target heat storage system is the electric drive loop and the battery loop, the engine hot water flows to the electric drive loop and the battery loop to maximize the recovery of engine heat. Figure 6 As shown in , the engine hot water flows to the electric drive loop and the battery loop to maximize the recovery of engine heat.

[0131] In some embodiments, the vehicle further comprises a heat dissipation device, and the heat dissipation device is installed on the engine, and the heat dissipation device has the same structure as the heating loop. As shown in Figures 1 to 6 , the heat dissipation device and the heating loop differ in that the hot air blown by the heating loop blows into the vehicle, while the hot air blown by the heat dissipation device blows out of the vehicle to reduce the temperature of the engine.

[0132] In some embodiments, please refer to Figure 12 , the engine waste heat control method can further include but is not limited to steps S1201 to S1203:

[0133] Step S1201, when the engine mode is the heat dissipation mode, the heat energy storage state of the electric drive loop and the battery loop is collected;

[0134] Step S1202, if the heat energy storage state is the heat energy not full state, the heat dissipation device and the waste heat utilization device are combined into a heat dissipation system;

[0135] Step S1203, the heat dissipation system and the engine are controlled by the heat exchange device to exchange heat.

[0136] In step S1201 of some embodiments, the engine mode is the heat dissipation mode, that is, the initial water temperature of the engine is greater than the set water temperature threshold, and the air conditioning operation mode is the heating mode, indicating that the water temperature of the engine is too high and will affect the normal operation of the engine. Therefore, the principle of sequentially grading waste heat utilization is no longer followed, and the heat energy storage state of the electric drive loop and the battery loop is collected first.

[0137] In steps S1202 to S1203 of some embodiments, when the heat energy storage state is the heat energy not full state, all devices / loops that can share the engine waste heat need to be combined into a heat dissipation system, so this embodiment combines the heat dissipation device and the waste heat utilization device into a heat dissipation system, and exchanges heat with the engine through the heat dissipation system.

[0138] Specifically, in the heat energy storage state is a heat energy insufficient state, the control of the electric drive circuit, the battery circuit reserves the heat generated by the engine, while starting the heating circuit and the heat dissipation device together to utilize the engine's waste heat, that is, the engine's temperature can be quickly reduced, reducing the engine failure.

[0139] In the steps S1201 to S1203 shown in the embodiment, by controlling the heat dissipation device and the waste heat utilization device to be combined into a heat dissipation system when the engine mode is a heat dissipation mode and the heat energy storage state of the electric drive circuit and the battery circuit is a heat energy insufficient state, and by exchanging heat between the heat dissipation system and the engine, the engine's temperature can be quickly and stably reduced, and the waste of engine heat energy can be reduced.

[0140] In some embodiments, please refer to Figure 13 , the engine waste heat control method can further include but is not limited to steps S1301 to S1303:

[0141] Step S1301, when the engine operating state is a stop state, the air conditioner operating mode is a heating mode, and the engine initial water temperature is greater than the preset waste heat recovery water temperature, the heating circuit and the engine are controlled to exchange heat through the heat exchange device;

[0142] Step S1302, in the heat exchange end state of the heating circuit, the heating update water temperature of the heating circuit is collected, and the update heating system is selected from the compressor and the engine according to the heating update water temperature and the preset heating water temperature threshold;

[0143] Step S1303, the heating circuit and the update heating system are controlled to exchange heat through the heat exchange device.

[0144] In step S1301 of some embodiments, if the engine is stopped and the air conditioner is still in the heating mode, the engine waste heat can be recovered to reduce energy consumption. It should be noted that for engine waste heat recovery, it is not required that the higher the recovery degree is, the better. If the temperature of the engine after waste heat recovery is too low, it will cause the engine to start again, and the water temperature will rise slowly, which will aggravate the engine internal wear, the fuel atomization effect is poor and the thermal efficiency is reduced, and the combustion is insufficient and the emission increases. Therefore, by judging the relationship between the engine initial water temperature and the waste heat recovery water temperature, if the engine initial water temperature is greater than the waste heat recovery water temperature, the heating circuit and the engine can be controlled to exchange heat through the heat exchange device, and the utilization rate of the engine waste heat can be improved.

[0145] It should be noted that the waste heat recovery water temperature represents the lowest water temperature at which waste heat can be recovered after the engine stops. Specifically, it is determined based on information such as battery SOC, available battery discharge power, navigation information, driving habits, engine natural cooling rate, and engine warm-up model to identify frequent engine start-up conditions. Therefore, the waste heat recovery water temperature is determined based on this frequent start-up data. Thus, until the initial engine water temperature drops to the waste heat recovery water temperature, the heater circuit will continuously exchange heat with the engine.

[0146] In step S1302 of some embodiments, after the heat exchange between the heating circuit and the engine is completed, the water temperature of the heating circuit is collected as the heating water replacement temperature, and it is determined whether the set heating water temperature threshold has been reached based on the heating water replacement temperature. It should be noted that the heating water temperature threshold is the heating temperature of the air conditioning system preset by the user. The replacement heating system is selected from the compressor and engine based on the heating water temperature and the heating water temperature threshold. Specifically, if the heating water temperature is greater than or equal to the heating water temperature threshold, the engine is selected as the replacement heating system; if the heating water temperature is less than the heating water temperature threshold, both the engine and the compressor are selected as the replacement heating system.

[0147] In step S1303 of some embodiments, the control method for updating the heating system and the engine to exchange heat is the same as the control method for the target heating system and the engine to exchange heat, and will not be described again here.

[0148] In steps S1301 to S1303 of this embodiment, after the engine stops, but the air conditioning is in heating mode and the initial engine water temperature exceeds the waste heat recovery water temperature, the waste heat generated by the engine is still recovered, which can reduce the waste of engine waste heat and improve the utilization rate of engine waste heat.

[0149] like Figure 14 As shown in the diagram, the thermal management principle for waste heat recovery after engine shutdown is as follows: Figure 14 As shown, through Figure 14 It can be seen that the heat transfer path is engine → water-cooled condenser → heater circuit. If the current water temperature of the electric drive is less than the initial water temperature of the engine and less than the water inlet temperature of the water cooler, the heat is recovered through the second heat exchanger of the electric drive circuit. The heat transfer path is: engine → electric drive circuit → condenser heat exchanger (Chiller) → water-cooled condenser → heater circuit.

[0150] In summary, this embodiment discloses a method for controlling engine waste heat, specifically implementing the graded utilization of engine waste heat. Please refer to [link / reference needed]. Figure 15It can be known that when the engine operating state is detected as a starting state, the air conditioner operating mode is a heating mode, and the water pump rotating speed is greater than the set rotating speed X, it is judged whether the initial engine water temperature is less than 95°C (set water temperature threshold). If the initial engine water temperature is less than 95°C, it is determined that the engine mode is a waste heat utilization mode, specifically a hierarchical waste heat recovery mode. Otherwise, if the initial engine water temperature is greater than 95°C, it is determined that the engine mode is a heat dissipation mode, and the heat energy storage state of the electric drive circuit and the battery circuit is a heat energy not full storage state. The heat dissipation device, the warm air circuit, the electric drive circuit and the battery circuit form a heat dissipation system, and heat exchange is performed between the heat dissipation system and the engine.

[0151] When the engine mode is the waste heat utilization mode, the current engine water temperature and the water cooling inlet water temperature are collected for comparison. If the current engine water temperature is greater than the water cooling inlet water temperature, heat exchange is performed between the warm air circuit and the engine through the heat exchange device, and the current warm air water temperature of the warm air circuit after heat exchange is collected. If the current warm air water temperature is greater than the sum of the warm air target water temperature and 10°C (preset threshold), it is determined that the engine mode is a heat storage mode. The current electric drive water temperature and the current battery water temperature are collected. If the current electric drive water temperature is greater than 45°C (electric drive target water temperature), heat storage is performed through the battery circuit. Otherwise, if the current electric drive water temperature is less than or equal to 45°C, heat storage is performed through the electric drive circuit. At the same time, after heat storage in the electric drive circuit, the updated electric drive water temperature is collected. If the updated electric drive water temperature is greater than 45°C, heat storage is performed in the battery circuit together. If the current warm air water temperature is less than the sum of the warm air target water temperature and the preset threshold, it is further judged whether the current warm air water temperature is greater than the sum of the warm air target water temperature and 5°C (preset difference). Only the warm air circuit and the engine can be controlled to perform heat exchange. If the current warm air water temperature is less than the sum of the warm air target water temperature and the preset difference, it indicates that the engine waste heat is difficult to meet the heat energy demand of the warm air circuit, and the compressor is controlled to start.

[0152] Therefore, in the engine waste heat control process, the warm air circuit, the electric drive circuit and the battery circuit are selected for waste heat utilization according to the engine water temperature. Specifically, the warm air circuit is first exchanged, and if there is still sufficient engine waste heat after the warm air circuit is exchanged, the electric drive circuit and the battery circuit are further selected for waste heat utilization. At the same time, when the engine waste heat is insufficient, the compressor and the engine are controlled to provide heat energy to the warm air circuit. Therefore, the engine waste heat is utilized hierarchically, which not only reduces waste heat waste, but also maximizes the utilization of engine waste heat without affecting the normal operation of each circuit.

[0153] Various technical features in the above embodiments can be combined arbitrarily as long as there is no conflict or contradiction between the features. However, due to the limited space, they are not described one by one, so any combination of various technical features in the above embodiments also belongs to the scope disclosed in the specification.

[0154] Please refer to Figure 16The engine waste heat control method is applied to an engine waste heat control device arranged in a vehicle, and the vehicle includes an engine, a heat exchange device, and a waste heat utilization device.

[0155] The engine waste heat control device includes:

[0156] The first collection module 1601 is configured to detect an engine mode of the vehicle, and collect an engine current water temperature of the engine and a water cooling outlet water temperature of the heat exchange device when the engine mode is a waste heat utilization mode.

[0157] The heating air heat exchange module 1602 is configured to control the heating air circuit and the engine to exchange heat through the heat exchange device when the engine current water temperature is greater than the water cooling outlet water temperature.

[0158] The second collection module 1603 is configured to collect a heating air current water temperature of the heating air circuit, an electric drive current water temperature of the electric drive circuit, and a battery current water temperature of the battery circuit in a heat exchange end state of the heating air circuit, where the heat exchange end state is a state after the heating air circuit and the engine exchange heat.

[0159] The heat storage screening module 1604 is configured to screen a target heat storage system from the electric drive circuit and the battery circuit according to the heating air current water temperature, the electric drive current water temperature, and the battery current water temperature.

[0160] The heat storage heat exchange module 1605 is configured to control the target heat storage system and the engine to exchange heat through the heat exchange device.

[0161] The engine waste heat control device has the same specific embodiments as the engine waste heat control method described above, and thus will not be described again.

[0162] The embodiment of the present application further discloses a vehicle including a vehicle controller and a memory connected with the vehicle controller in communication; the memory stores instructions executable by the vehicle controller, and the instructions are executed by the vehicle controller to enable the vehicle controller to execute the engine waste heat control method described above.

[0163] The embodiment of the present application further provides a computer readable storage medium storing a computer program, and the computer program is executed by a processor to implement the engine waste heat control method described above.

[0164] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory can optionally include a memory disposed remotely relative to the processor, which can be connected to the processor through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0165] The engine waste heat control method and device, the vehicle and the storage medium provided by the embodiments of the present application can detect that the engine mode of the vehicle is a waste heat utilization mode, collect the current engine water temperature and the water cooling outlet water temperature, control the heating circuit and the engine to exchange heat when the current engine water temperature is greater than the water cooling outlet water temperature. Then, the current water temperature of the heating circuit after heat exchange is collected, and the current electric drive temperature of the electric drive circuit and the current battery temperature of the battery circuit are collected. According to the current water temperature of the heating circuit, the current electric drive temperature and the current battery temperature, a target heat storage system that can further store heat is selected from the electric drive circuit and the battery circuit, and heat exchange is performed between the heat storage system and the engine. Therefore, when the engine generates waste heat, if the engine hot water temperature is too high, the excess heat energy can be provided to the electric drive circuit or the battery circuit to increase the utilization rate of the engine waste heat, and the safety of the heating circuit can be improved, and the maintenance cost of the engine can be reduced.

[0166] The embodiments described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0167] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and can include more or fewer steps than shown in the figures, or combine certain steps or different steps.

[0168] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separate, that is, can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0169] Those skilled in the art can understand that all or some of the steps in the above disclosed method, the functional modules / units in the system and the device can be implemented as software, firmware, hardware and their appropriate combinations.

[0170] The terms "first", "second", "third", "fourth" and the like in the description of this application and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover a changeable order, sequence or arrangement, if any. Further, the terms "comprising", "having", "including", and "containing" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product or apparatus that comprises, has, includes or contains a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, system, product or apparatus.

[0171] It should be understood that, in the application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the relationship between associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases: only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0172] In several embodiments provided in the application, it should be understood that the disclosed controller and method can be implemented in other ways. For example, the above-described controller embodiments are only illustrative, for example, the division of the above-mentioned units is only a logical functional division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0173] The units described above as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0174] In addition, each of the functional units in the embodiments of the present application can be integrated in one processing unit, or each unit can exist alone physically, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software functional unit.

[0175] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such an understanding, the technical solutions of the present application, essentially or partially, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes multiple instructions used to cause a computer device (such as a personal computer, a server, or a network device) to perform all or part of the steps of the methods in the embodiments of the present application. The foregoing storage medium includes: various memories (such as a read-only memory, a random access memory, a flash memory, or the like) and a magnetic disk or an optical disk and the like.

[0176] The preferred embodiments of the embodiments of the present application are described above with reference to the accompanying drawings, and are not intended to limit the scope of the embodiments of the present application. Any modification, equivalent replacement, and improvement made by those skilled in the art without departing from the scope and spirit of the embodiments of the present application shall fall within the scope of the embodiments of the present application.

Claims

1. A method for controlling engine waste heat, characterized in that, Applied to vehicles, the vehicles include an engine, a heat exchange device, and a waste heat recovery device, the waste heat recovery device including a heating circuit, an electric drive circuit, and a battery circuit respectively connected to the heat exchange device through pipelines; The method includes: The engine mode of the vehicle is detected, and when the engine mode is waste heat utilization mode, the current engine water temperature and the water-cooled outlet water temperature of the heat exchange device are collected. When the current engine water temperature is greater than the water-cooled outlet water temperature, the heat exchange device controls the heating air circuit to exchange heat with the engine. In the heat exchange end state of the heating circuit, the current water temperature of the heating circuit, the current water temperature of the electric drive circuit, and the current water temperature of the battery circuit are collected; wherein, the heat exchange end state is the state after the heating circuit and the engine have exchanged heat. The target thermal storage system is selected from the electric drive circuit and the battery circuit based on the current water temperature of the heater, the current water temperature of the electric drive, and the current water temperature of the battery. The heat exchange device controls the heat exchange between the target thermal storage system and the engine.

2. The engine waste heat control method according to claim 1, characterized in that, The step of selecting a target thermal storage system from the electric drive circuit and the battery circuit based on the current water temperature of the heater, the current water temperature of the electric drive, and the current water temperature of the battery includes: When the current water temperature of the heating air is greater than the preset heating air threshold, a preliminary heat storage system is selected from the electric drive circuit and the battery circuit based on the current water temperature of the electric drive, the preset target water temperature of the electric drive, the current water temperature of the battery, and the preset target water temperature of the battery. The heat exchange device controls the heat exchange between the preliminary heat storage system and the engine, and collects the electric drive water temperature of the electric drive circuit and the battery water temperature of the battery circuit. The preliminary thermal storage system is adjusted based on the electric drive renewal water temperature, the battery renewal water temperature, the electric drive target water temperature, and the battery target water temperature to obtain the target thermal storage system.

3. The engine waste heat control method according to claim 2, characterized in that, When the current water temperature of the heater is greater than a preset heating threshold, a preliminary heat storage system is selected from the electric drive circuit and the battery circuit based on the current water temperature of the electric drive, a preset target water temperature of the electric drive, the current water temperature of the battery, and a preset target water temperature of the battery, including: When the current water temperature of the heating air is greater than the preset heating air threshold and the current water temperature of the electric drive is less than the target water temperature of the electric drive, the electric drive circuit is used as the initial heat storage system. When the current water temperature of the heater is greater than the preset heater threshold, the current water temperature of the electric drive is greater than the target water temperature of the electric drive, and the current water temperature of the battery is less than the target water temperature of the electric drive, the battery circuit is used as the heat storage system.

4. The engine waste heat control method according to any one of claims 1 to 3, characterized in that, The vehicle also includes a compressor. After detecting the engine mode of the vehicle and, when the engine mode is waste heat recovery mode, collecting the current engine coolant temperature and the water-cooled outlet temperature of the heat exchanger, the method further includes: When the current water temperature of the engine is less than or equal to the water outlet temperature of the water cooler, the engine and the compressor are combined into a target heating system. The heat exchange device controls the heating air circuit to exchange heat with the target heating system.

5. The engine waste heat control method according to any one of claims 1 to 3, characterized in that, The process for determining the waste heat utilization mode is as follows: Detect the engine operating status and the vehicle air conditioning operating mode; When the engine is in the start state and the air conditioner is in the heating mode, the engine's water pump speed and initial engine water temperature are collected. When the water pump speed is greater than the set speed and the initial engine water temperature is less than the set water temperature threshold, the engine mode of the vehicle is determined to be the waste heat utilization mode.

6. The engine waste heat control method according to claim 5, characterized in that, The vehicle also includes a compressor, and the method further includes: When the engine is in a stopped state, the air conditioner is in heating mode, and the initial water temperature of the engine is greater than the preset waste heat recovery water temperature, the heat exchange device controls the heating circuit to exchange heat with the engine. When the heat exchange of the heating circuit is completed, the heating water temperature of the heating circuit is collected, and a replacement heating system is selected from the compressor and the engine based on the heating water temperature and a preset heating water temperature threshold. The heat exchange device controls the heat exchange between the warm air circuit and the regeneration heating system.

7. The engine waste heat control method according to any one of claims 1 to 3, characterized in that, The vehicle further includes: a cooling device disposed on the engine, and the method further includes: When the engine mode is cooling mode, the thermal energy storage status of the electric drive circuit and the battery circuit is collected; If the thermal energy storage state is not full, the heat dissipation device and the waste heat utilization device are combined into a heat dissipation system. The heat exchange device controls the heat exchange system to exchange heat with the engine.

8. An engine waste heat control device, characterized in that, The device is installed inside a vehicle, which includes an engine, a heat exchange device, and a waste heat utilization device. The waste heat utilization device includes a heating circuit, an electric drive circuit, and a battery circuit that are respectively connected to the heat exchange device via pipelines. The device includes: The first acquisition module is used to detect the engine mode of the vehicle, and when the engine mode is waste heat utilization mode, to acquire the current engine water temperature and the water cooling outlet water temperature of the heat exchange device. The heating air heat exchange module is used to control the heating air circuit to exchange heat with the engine when the current water temperature of the engine is greater than the water outlet water temperature; The second acquisition module is used to acquire the current water temperature of the heating circuit, the current water temperature of the electric drive circuit, and the current water temperature of the battery circuit in the heating circuit when the heat exchange is completed; wherein, the heat exchange completion state is the state after the heating circuit and the engine have exchanged heat. A thermal energy storage screening module is used to screen target thermal energy storage systems from the electric drive circuit and the battery circuit based on the current water temperature of the heater, the current water temperature of the electric drive, and the current water temperature of the battery. A heat storage and heat exchange module is used to control the heat exchange between the target heat storage system and the engine through the heat exchange device.

9. A vehicle, characterized in that, It includes a vehicle controller and a memory for communicatively connecting with the vehicle controller; the memory stores instructions executable by the vehicle controller to cause the vehicle controller to perform the engine waste heat control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed, implements the engine waste heat control method as described in any one of claims 1 to 7.

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