Plug-in hybrid power vehicle type thermal management heating system and control method

Abstract

The invention discloses a plug-in hybrid power vehicle type thermal management heating system which comprises an engine, double motors and a battery, the engine is connected with an engine circulation loop and a PTC heating loop, the PTC heating loop is connected with a waste heat recovery loop, the battery is connected with a battery heating loop, and the battery heating loop is connected with a power supply loop. By means of the plug-in hybrid power vehicle type heat management heating system, the engine heating energy consumption and time in an extremely low temperature mode are reduced, and the waste heat utilization rate of the heat management system is optimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive thermal management. Specifically, the present invention relates to a thermal management heating system and control method for a plug-in hybrid vehicle model. Background Art

[0002] With the guidance of the national new energy vehicle industry policy, plug-in hybrid electric vehicles, as representatives of new energy vehicles, occupy the mainstream of future vehicle development. The vehicle thermal management system includes high and low temperature cooling systems, cabin air conditioning systems, and battery thermal management systems. Among them, the heating requirements for the vehicle interior and battery are provided by the vehicle engine, PTC, and motor waste heat. The usage scenarios include pure electric mode, hybrid mode, engine high-speed direct drive mode, idle power feeding mode, etc. The coordinated switching scenarios of various heat source modes are complex.

[0003] Existing plug-in hybrid vehicle models use multiple multi-way valves to switch and isolate the engine heat source and the warm air PTC heat source. According to the switching requirements of the usage scenarios, there are problems such as complex circuits, high costs, low heat utilization efficiency, and high energy consumption.

[0004] The invention patent with the publication number CN 115056628B was published on September 6, 2024, with the name of a thermal management system for a hybrid vehicle model, including a high-temperature side cooling system, a medium-temperature side cooling system, and a low-temperature side cooling system. Due to different temperature gradients, the three systems circulate and replenish liquid independently; after the battery refrigerant of this thermal management system is directly cooled, the water circuits are reasonably arranged according to the temperature gradient, and the excess heat can be released through the reasonable arrangement and area setting of the front radiator, and the high and low temperature sides are respectively replenished with water and returned with gas to avoid mutual interference due to different water temperature gradients. This hybrid vehicle model thermal management system also cannot solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a thermal management heating system for a plug-in hybrid vehicle model that reduces the engine warm-up energy consumption and time in extremely low temperature modes and optimizes the waste heat utilization rate of the thermal management system in view of the deficiencies of the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] The thermal management heating system for the plug-in hybrid vehicle model includes an engine, a dual motor, and a battery. The engine is connected to an engine circulation circuit and a PTC heating circuit. The PTC heating circuit is connected to a waste heat recovery circuit. The battery is connected to a battery heating circuit.

[0008] One end of the waste heat recovery circuit is connected to the PTC heating circuit by a three-way valve Ⅰ, and the other end of the waste heat recovery circuit, the PTC heating circuit and the engine circulation circuit are connected by a three-way valve Ⅱ; the PTC heating circuit is connected to the battery heating circuit by a battery heat exchanger.

[0009] A battery cooler, a battery pack, a battery water pump, and a circulation water kettle are provided on the battery heating circuit, and a three-way valve Ⅲ is connected between the battery heat exchanger, the battery cooler and the battery.

[0010] A cooling mechanism is provided between the engine circulation circuit and the waste heat recovery circuit. The cooling mechanism includes a high-temperature radiator and a low-temperature radiator. The high-temperature radiator is provided on the engine circulation circuit, and the low-temperature radiator is connected to the waste heat recovery circuit. A condenser and a cooling fan are respectively provided on both sides of the high-temperature radiator, and an intercooler is provided on one side of the condenser.

[0011] A water heating PTC, a warm water pump, and a warm air core are provided on the PTC heating circuit.

[0012] The dual motor is provided with a dual motor oil cooler, and the dual motor oil cooler is connected to the waste heat recovery circuit. The engine is fixedly connected with an engine main water pump, a transmission oil cooler and a thermostat, and the engine main water pump, the transmission oil cooler and the thermostat are all connected to the engine circulation circuit.

[0013] A dual motor controller, a charging two-in-one, and a motor cooling water pump are also provided on the waste heat recovery circuit.

[0014] The heat management heating control method for a plug-in hybrid vehicle type is realized by the above-mentioned heat management heating system for a plug-in hybrid vehicle type, and includes the following steps:

[0015] Step 1: When heating requirements are issued by the passenger compartment and the battery in an ultra-low temperature environment, turn on the PTC heating circuit;

[0016] Step 2: Connect the interface a and the interface c of the three-way valve Ⅰ, connect the interface d and the interface f of the three-way valve Ⅱ, and adjust the opening degrees of the interface h and the interface i of the three-way valve Ⅲ according to the PI of the battery heating target water temperature;

[0017] Step 3: After monitoring that the water temperature and flow rate of the engine are higher than the target threshold for more than 60 s, turn off the engine operation and enter the pure electric or hybrid heating mode.

[0018] The step 3 further includes the following steps: when the vehicle is in the pure electric heating mode, preferentially turn on the PTC heating circuit for heating; connect the interface b and the interface c of the three-way valve Ⅰ, connect the interface d and the interface f of the three-way valve Ⅱ; adjust the opening degrees of the interface h and the interface i of the three-way valve Ⅲ according to the PI of the battery heating target water temperature; after the inlet water temperature of the warm air circuit and the inlet water temperature of the battery reach the target threshold, enter the steady-state heating state.

[0019] The present invention has the following technical effects:

[0020] 1. Through the design of the circuit principle and the optimization of the control strategy, the complexity of the component circuits is simplified, and the efficient and concise coordinated utilization of each heat source is realized. In the extremely low temperature mode, the flow rate of the water pump in the PTC heating circuit is used to suppress the heat dissipation flow rate of the engine's small cycle, achieving a rapid temperature rise inside the engine, reducing the warm-up time. At the same time, the supplementary heat source of the engine enters the main heating circuit, increasing the inlet and outlet water temperatures of the PTC heating, reducing the fuel consumption and power consumption of low-temperature heating in winter, and solving the problems of high energy consumption and long time for engine warm-up in the extremely low temperature mode;

[0021] 2. In the pure electric and hybrid modes, the temperatures of the motor electronic control, the engine, and the PTC circuit are collected, and the flow rate and temperature ratio of the circuit are calculated and mixed according to the software logic to control the proportional opening of multiple three-way valves, maximizing the use of the motor electronic control operation and the waste heat of the engine to supply heat to the heating circuit, increasing the heating rate of the vehicle interior and the battery heating, and optimizing the problem of low utilization rate of the waste heat in the motor electronic control circuit of hybrid vehicles. Description of the Drawings

[0022] This specification includes the following drawings, and the shown contents are respectively:

[0023] Figure 1 is the principle block diagram of the thermal management heating system of the plug-in hybrid vehicle of the present invention;

[0024] Figure 2 is the logic block diagram of the thermal management heating system of the plug-in hybrid vehicle of the present invention.

[0025] The labels in the figure are: 1. Engine circulation circuit; 2. PTC heating circuit; 3. Waste heat recovery circuit; 4. Battery heating circuit; 5. Engine; 6. Dual motors; 7. Dual motor controller; 8. Charge integrated unit; 9. Motor cooling water pump; 10. Low-temperature radiator; 11. Condenser; 12. Intercooler; 13. High-temperature radiator; 14. Cooling fan; 15. Three-way valve I; 15-1. Interface a; 15-2. Interface b; 15-3. Interface c; 16. Water heating PTC; 17. Warm water pump; 18. Three-way valve II; 18-1. Interface d; 18-2. Interface e; 18-3. Interface f; 19. Warm air core; 20. Battery heat exchanger; 21. Battery cooler; 22. Three-way valve III; 22-1. Interface g; 22-2. Interface h; 22-3. Interface i; 23. Battery; 24. Battery water pump; 25. Circulation water kettle; 26. Dual motor oil cooler; 27. Engine main water pump; 28. Transmission oil cooler; 29. Thermostat. Detailed Embodiments

[0026] The following will further describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings through the description of embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present invention and facilitate its implementation.

[0027] As Figure 1 and Figure 2 shown, the heat management heating system for a plug-in hybrid vehicle model includes an engine 5, a dual motor 6 and a battery 23. The engine 5 is connected with an engine circulation loop 1 and a PTC heating loop 2. The PTC heating loop 2 is connected with a waste heat recovery loop 3. The battery 23 is connected with a battery heating loop 4.

[0028] The heat management heating system for the plug-in hybrid vehicle model designs the heat pipeline principle architecture and control strategy, and adopts multiple three-way valves of the battery 23 and electronic water pumps, and multiple cooling and heating loops composed of heating parts and heat exchangers. By switching the connection of the loops through valves and pumps, the waste heat absorption of different loops under various working conditions is realized, the heat of the main heating loop is increased, and the problem of low waste heat utilization rate of the motor loop of the hybrid vehicle model is optimized, greatly reducing the winter heating energy consumption of the plug-in hybrid vehicle model; when the vehicle is in an extremely low temperature mode, by controlling each pump and valve, the temperature rise rate of the engine 5 is increased, the heating efficiency is improved, the fuel consumption and power consumption of the plug-in hybrid vehicle model for winter low-temperature heating are reduced, and the problems of high warm-up energy consumption and long time of the engine 5 in the extremely low temperature mode are solved.

[0029] As Figure 1 shown, one end of the waste heat recovery loop 3 is connected with the PTC heating loop 2 by a three-way valve I 15, and the other end of the waste heat recovery loop 3, the PTC heating loop 2 and the engine circulation loop 1 are connected with a three-way valve II 18; the PTC heating loop 2 is connected with the battery heating loop 4 by a battery heat exchanger 20. The three-way valve I 15 and the three-way valve II 18 control the connection between the PTC heating loop 2 and the engine 5 or the waste heat recovery loop 3, so that the PTC heating loop 2 can adapt to the current driving mode of the vehicle and the change process of the vehicle body driving mode according to the heating demand, facilitating the normal start of the vehicle heating system and conducive to stably entering the heating steady state.

[0030] As Figure 1As shown in the figure, a battery cooler 21, a battery pack 23, a battery water pump 24, and a circulation water kettle 25 are provided on the battery heating circuit 4. A three-way valve III 22 is connected between the battery heat exchanger 20, the battery cooler 21, and the battery 23. The battery water pump 24 provides power for the heat exchange and flow process of the coolant in the battery heating circuit 4. The three-way valve III 22 can reduce the complexity of the battery 23 circuit, meet the connection of the battery cooler 21 on the battery heating circuit 4, and adapt to the cooling requirement of the battery cooler 21 to cool the battery 23 when the temperature of the battery 23 is greater than the set threshold. At this time, the interface g22-1 and the interface i22-3 of the three-way valve III 22 are connected, and after heat exchange, it is connected to the PTC heating circuit 2 through the battery heat exchanger 20.

[0031] As Figure 1 shown in the figure, a cooling mechanism is provided between the engine circulation circuit 1 and the waste heat recovery circuit 3. The cooling mechanism includes a high-temperature radiator 13 and a low-temperature radiator 10. The high-temperature radiator 13 is provided on the engine circulation circuit 1, and the low-temperature radiator 10 is connected to the waste heat recovery circuit 3. A condenser 11 and a cooling fan 14 are respectively provided on both sides of the high-temperature radiator 13, and an intercooler 12 is provided on one side of the condenser 11. In a low-temperature environment, when the warm water pump 17 runs at full speed, the heat dissipation of the above cooling mechanism will be inhibited, meeting the normal operation of the engine 5 during the warm-up start process. A parallel branch of the waste heat recovery circuit 3 is connected in series with the low-temperature radiator 10 and the dual-motor oil cooler 26, thereby directly recovering the waste heat of the generator and the dual-motor oil cooler 26 and improving the utilization rate of heat.

[0032] As Figure 1 shown in the figure, a water heating PTC, a warm water pump 17, and a warm air core 19 are provided on the PTC heating circuit 2. When the vehicle passenger compartment needs heating or the battery 23 needs to be preheated, the vehicle air-conditioning control unit or the battery 23 management system will send an instruction to the controller of the water heating PTC. After receiving the instruction, it turns on the PTC heating circuit 2, and makes it generate heat through the PTC heating element to heat the flowing coolant, and meets the heating requirement of the passenger compartment and the preheating requirement of the battery 23 through the warm air core 19, the warm water pump 17, and the heat exchange components on the PTC heating circuit 2.

[0033] As Figure 1As shown in the figure, the dual-motor 6 is provided with a dual-motor oil cooler 26. The dual-motor oil cooler 26 is connected to the waste heat recovery circuit 3. The engine 5 is fixedly connected with an engine main water pump 27, a transmission oil cooler 28 and a thermostat 29. The engine main water pump 27, the transmission oil cooler 28 and the thermostat 29 are all connected to the engine circulation circuit 1. The dual-motor 6 is a drive motor + generator. The engine main water pump 27 provides power for the engine circulation circuit 1. The oil cooler is used to cool the engine oil in the transmission of the engine 5 and exchange heat with the waste heat recovery circuit 3. The engine circulation circuit 1 is a small circulation in the engine 5 cooling system. When the engine main water pump 27 works, the coolant is pumped out from the water tank or expansion tank. The coolant is driven by the water pump and enters the water jacket of the engine block of the engine 5 to exchange heat with the engine 5. When the temperature of the coolant is lower than the opening temperature of the thermostat 29, the thermostat 29 closes to prevent the coolant from entering the radiator and flows back to the water pump through the bypass pipe of the thermostat 29 to continue circulating inside the engine 5.

[0034] As Figure 1 shown, a dual-motor controller 7, a charging two-in-one 8 and a motor cooling water pump 9 are also provided on the waste heat recovery circuit 3. The waste heat recovery circuit 3 serves as an electric drive cooling and waste heat recovery return circuit. The motor cooling water pump 9 provides power for the waste heat recovery process generated by motor cooling. The heat generated by the dual-motor controller 7 and the charging two-in-one 8 participates in the thermal cycle of the whole vehicle through heat exchange. The waste heat is used to heat the battery 23 pack or the passenger compartment to realize the recovery and utilization of heat and improve the energy utilization efficiency of the whole vehicle.

[0035] As Figure 2 shown, the heat management heating control method for this plug-in hybrid vehicle model is realized through the above-mentioned heat management heating system for plug-in hybrid vehicles, and includes the following steps: Step 1: When heating requirements are issued by the passenger compartment and the battery 23 in an ultra-low temperature environment, turn on the PTC heating circuit; Step 2: Connect the interface a15-1 and the interface c15-3 of the three-way valve I 15, and connect the interface d18-1 and the interface f18-3 of the three-way valve II 18. Adjust the opening degrees of the interface h22-2 and the interface i22-3 of the three-way valve III 22 according to the PI of the battery 23 heating target water temperature; Step 3: After monitoring that the water temperature and flow rate of the engine 5 are higher than the target threshold for more than 60 s, turn off the operation of the engine 5 and enter the pure electric or hybrid heating mode.

[0036] As Figure 2As shown, Step 3 further includes the following steps: When the vehicle is in the pure electric heating mode, the PTC heating circuit 2 is preferentially turned on for heating; the interface b15-2 and the interface c15-3 of the three-way valve I 15 are connected, and the interface d18-1 and the interface f18-3 of the three-way valve II 18 are connected; according to the PI of the target water temperature for heating the battery 23, the opening degrees of the interface h22-2 and the interface i22-3 of the three-way valve III 22 are adjusted; after the water temperature at the inlet of the warm air circuit and the water temperature at the inlet of the battery 23 reach the target threshold, it enters the steady-state heating state.

[0037] According to the heating requirements under different scenario conditions, the thermal management controller controls the proportion of the three-way valve and the duty cycle of the water pump to achieve reasonable heat distribution; referring to the heating logic block diagram, it is mainly composed of ultra-low temperature auxiliary heating, pure electric heating, and hybrid heating modes.

[0038] When the passenger compartment / battery 23 in the ultra-low temperature environment issues a heating requirement, while turning on the PTC heating circuit, it requests the engine 5 to start to supplement the heat source of the main heating circuit. The interface a15-1 and the interface c15-3 of the three-way valve I 15 are connected, and the interface d18-1 and the interface e18-2 of the three-way valve II 18 are connected to access the small circulation circuit of the engine 5. At this time, the PTC warm air water pump 17 runs at full speed, suppressing the heat dissipation flow of the small circulation of the engine 5, increasing the internal temperature rise rate of the engine 5, shortening the warm-up time of the engine 5, and reducing fuel consumption; at the same time, according to the PI of the target water temperature for heating the battery 23, the opening degrees of the interface h22-2 and the interface i22-3 of the three-way valve III 22 are adjusted to control the hot water flow to prevent the battery 23 from overheating. When it is monitored that the water temperature and flow rate of the engine 5 are higher than the target threshold for more than 60s and the heat in the circuit is sufficient, the operation request of the engine 5 is turned off, and it enters the pure electric or hybrid heating mode;

[0039] When the passenger compartment / battery 23 in the pure electric mode under low temperature environment issues a heating requirement, the PTC heating circuit 2 is preferentially turned on for heating. The interface b15-2 and the interface c15-3 of the three-way valve I 15 are connected, and the interface d18-1 and the interface f18-3 of the three-way valve II 18 are connected. The main heating circuit absorbs the waste heat of the motor, improving the heat utilization rate and reducing the energy consumption of the air-conditioning PTC heating; the hot water of the PTC heating circuit 2 exchanges heat through the battery heat exchanger 20 to the battery heating circuit 4. The opening degrees of the interface h22-2 and the interface i22-3 of the three-way valve III 22 are adjusted according to the PI of the target water temperature for heating the battery 23 to control the flow rate of the battery heating circuit 4. When the water temperature at the inlet of the warm air circuit and the water temperature at the inlet of the battery 23 reach the target threshold, it enters the steady-state heating state;

[0040] In the hybrid mode of low temperature environment, the cabin / battery 23 sends out heating demand, and the PTC heating circuit 2 is turned on for heating first. At the same time, the water temperature of the engine 5 and the water temperature of the motor circuit are collected. The three-way valves Ⅰ15 and Ⅱ are calibrated according to the opening ratio of the two temperatures and flow rates to mix hot water into the PTC heating circuit 2, and absorb the heat of the drive motor and the engine 5 at the same time, greatly improving the heat utilization rate and reducing the air conditioning PTC heating energy consumption. The hot water of the PTC heating circuit 2 is exchanged to the battery heating circuit 4 through the battery heat exchanger 20. The opening of the interface h22-2 and the interface i22-3 of the three-way valve Ⅲ22 is adjusted according to the heating target water temperature PI of the battery 23. When the engine 5 + drive motor ratio mixed water temperature ≥ the heating target water temperature x℃, and it lasts for 120s, the PTC heating circuit 2 control is turned off, and the system waste heat is fully utilized to provide heating demand, reducing the energy consumption of the whole vehicle. When the water temperature at the inlet of the warm air circuit reaches the calculated target threshold, the steady-state heating state is entered.

[0041] The above control solves the problem of heat source distribution for heating the interior of the vehicle and the battery 23 under various working conditions. By coordinating the control of the three-way valve, the heater water pump 17 and the engine 5 water pump, the temperature rise rate of the engine 5 is effectively increased, energy consumption is reduced, and the cabin heating efficiency is improved. At the same time, by regulating the flow of the three-way valve and the water pump, the overheating problem of the battery 23 is avoided, and accurate and efficient temperature control is achieved.

[0042] The plug-in hybrid vehicle thermal management heating system has the following technical effects: 1. Through the circuit principle design and control strategy optimization, the complexity of the component circuit is simplified, and the efficient and concise coordinated use of various heat sources is achieved. In the extremely low temperature mode, the PTC heating circuit water pump flow is used to suppress the engine 5 small cycle heat dissipation flow, so as to achieve a rapid temperature rise inside the engine 5 and reduce the warm-up time. At the same time, the supplementary heat source of the engine 5 enters the main heating circuit, which improves the inlet and outlet water temperature of the PTC heating, reduces the fuel consumption and power consumption of low-temperature heating in winter, and solves the problem of high energy consumption and long time of warm-up of the engine 5 in the extremely low temperature mode; 2. In the pure electric and hybrid modes, the temperature of the motor electronic control, the engine 5, and the PTC circuit are collected, and the circuit flow and temperature ratio are mixed according to the software logic calculation to control the proportional opening of multiple three-way valves, so as to maximize the use of the motor electronic control work and the residual heat of the engine 5 to heat the heating circuit, improve the heating rate in the car and the heating rate of the battery 23, and optimize the problem of low residual heat utilization rate of the motor electronic control circuit of the hybrid vehicle.

[0043] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A plug-in hybrid vehicle thermal management heating system, characterized in that: It includes an engine, dual motors and a battery. The engine is connected to an engine circulation loop and a PTC heating loop. The PTC heating loop is connected to a waste heat recovery loop. The battery is connected to a battery heating loop.

2. The plug-in hybrid vehicle thermal management heating system according to claim 1, characterized in that: One end of the waste heat recovery circuit is connected to the PTC heating circuit with a three-way valve I, and the other end of the waste heat recovery circuit, the PTC heating circuit and the engine circulation circuit are connected with a three-way valve II; the PTC heating circuit and the battery heating circuit are connected with a battery heat exchanger.

3. The plug-in hybrid vehicle thermal management heating system according to claim 2, characterized in that: The battery heating circuit is provided with a battery cooler, a battery pack, a battery water pump, and a circulating water kettle, and a three-way valve III is connected between the battery heat exchanger, the battery cooler, and the battery.

4. The plug-in hybrid vehicle thermal management heating system according to claim 3, characterized in that: A cooling mechanism is provided between the engine circulation loop and the waste heat recovery loop, and the cooling mechanism includes a high-temperature radiator and a low-temperature radiator. The high-temperature radiator is provided on the engine circulation loop, and the low-temperature radiator is connected to the waste heat recovery loop. A condenser and a cooling fan are provided on both sides of the high-temperature radiator, and an intercooler is provided on one side of the condenser.

5. The plug-in hybrid vehicle thermal management heating system according to claim 4, characterized in that: The PTC heating circuit is provided with a water heating PTC, a warm air water pump and a warm air core.

6. The plug-in hybrid vehicle thermal management heating system according to claim 6, characterized in that: The dual motors are provided with dual motor oil coolers, which are connected to the waste heat recovery circuit; the engine is fixedly connected with an engine main water pump, a transmission oil cooler and a thermostat, which are all connected to the engine circulation circuit.

7. The plug-in hybrid vehicle thermal management heating system according to claim 1, characterized in that: The waste heat recovery circuit is also provided with a dual motor controller, a two-in-one charger and a motor cooling water pump.

8. A plug-in hybrid vehicle thermal management heating control method, implemented by the plug-in hybrid vehicle thermal management heating system according to any one of claims 3 to 7, characterized in that: The following steps are involved: Step 1: When the cabin and the battery need to heat in an ultra-low temperature environment, the PTC heating circuit is turned on; Step 2, the interface a and the interface c of the three-way valve I are connected, the interface d and the interface f of the three-way valve II are connected, and the opening of the interface h and the interface i of the three-way valve III is adjusted according to the battery heating target water temperature PI; Step 3: When the engine water temperature and flow rate are detected to be higher than the target threshold for more than 60 seconds, the engine is shut down and the pure electric or hybrid heating mode is entered.

9. The plug-in hybrid vehicle thermal management heating control method according to claim 8, characterized in that: The step 3 also includes the following steps: when the vehicle is in pure electric heating mode, the PTC heating circuit is turned on for heating first; the interface b and interface c of the three-way valve I are connected, and the interface d and interface f of the three-way valve II are connected; the opening of the interface h and interface i of the three-way valve III are adjusted according to the battery heating target water temperature PI; after the water temperature at the inlet of the warm air circuit and the water temperature at the inlet of the battery reach the target threshold, the steady-state heating state is entered.

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