Thermal management system of hybrid electric vehicle

Abstract

The invention provides a thermal management system of a hybrid electric vehicle. The thermal management system comprises a battery cooling / heating loop used for regulating and controlling the temperature of a battery, an engine cooling loop used for controlling the working temperature of an engine and a cabin heating loop used for regulating the temperature of a cabin. The battery and the cabin are heated through heat of the engine, waste heat of the engine is fully utilized, heat is dissipated through the warm air core, and the use frequency of an air conditioning system is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hybrid electric vehicles, and in particular relates to a thermal management system for a hybrid electric vehicle. Background Art

[0002] With the increasing awareness of environmental protection and the development of automobile technology, hybrid vehicles have received widespread attention because they have the advantages of both fuel engines and electric drive systems. However, the engine, battery and cabin of hybrid vehicles have different temperature requirements, and reasonable thermal management is essential. Traditional thermal management systems often manage the thermal management of the engine, battery and cabin independently, resulting in complex systems, high costs, and low energy efficiency. At the same time, in terms of battery cooling, over-reliance on the air conditioning system not only increases energy consumption, but also affects the overall performance of the vehicle. Therefore, it is of great practical significance to develop an efficient and low-cost thermal management system for hybrid vehicles. Summary of the invention

[0003] The present invention discloses an engine thermal management scheme for a hybrid electric vehicle, which fully utilizes the heat of the engine itself to heat the battery and the cabin respectively, and reduces the use frequency of the air conditioning system by utilizing a heater core to dissipate heat.

[0004] The technical solution of the present invention is as follows:

[0005] A hybrid vehicle thermal management system includes a battery cooling / heating circuit for regulating battery temperature, an engine cooling circuit for controlling engine operating temperature, a cabin heating circuit for adjusting cabin temperature, and a three-position six-way solenoid valve for switching the connection status of each circuit; the three-position six-way solenoid valve is respectively connected to the battery cooling / heating circuit and the cabin heating circuit, and the three-position six-way solenoid valve has six interfaces a, b, c, d, e, and f.

[0006] Furthermore, the three-position six-way solenoid valve has three working positions, and the working positions are switched by changing the connection relationship between the interfaces.

[0007] Further, the three working positions include: position one, position two, and position three;

[0008] When the three-position six-way solenoid valve is in position one, the interface a is connected to the interface c, the interface b is connected to the interface d, and the interface e is connected to the interface f;

[0009] When the three-position six-way solenoid valve is in position two, the interface a is connected to the interface c, the interface b is connected to the interface f, and the interface d is connected to the interface e;

[0010] When the three-position six-way solenoid valve is in position three, the interface c is communicated with the interface e, and the interface d is communicated with the interface f.

[0011] Further, when the three-position six-way solenoid valve is in position one, the engine water jacket water outlet, the thermostat, the fourth thermal expansion valve, the high-temperature radiator, the fourth three-way valve, the third three-way valve, the engine water pump, and the engine water jacket water inlet are sequentially connected to form an engine cooling circuit;

[0012] The engine water jacket water outlet, the thermostat, the third thermal expansion valve, the three-position six-way solenoid valve, the heater core, the third three-way valve, the engine water pump, and the engine water jacket water inlet are sequentially connected to form a cabin heating circuit;

[0013] The battery cold plate water outlet, expansion kettle, electronic water pump, WPTC, three-position six-way solenoid valve, chiller, and battery cold plate water inlet are connected in sequence; the compressor, condenser, first three-way valve, first thermal expansion valve, chiller, and second three-way valve are connected in sequence, and the two circuits together constitute a battery cooling circuit.

[0014] Further, when the three-position six-way solenoid valve is in position two,

[0015] The engine water jacket water outlet, thermostat, third thermal expansion valve, heater core, chiller, battery cold plate, expansion kettle, electronic water pump, WPTC, three-position six-way solenoid valve, third three-way valve, engine water pump, and engine water jacket water inlet are connected in sequence to form a battery heating circuit using engine coolant.

[0016] Furthermore, when the three-position six-way solenoid valve is in position three, the battery cold plate water outlet, expansion kettle, electronic water pump, WPTC, three-position six-way solenoid valve, heater core, chiller, and battery cold plate water inlet are connected in sequence to form a battery cooling circuit using the heater core.

[0017] Furthermore, a sensor assembly and a controller for monitoring system operating parameters are also provided, and the sensor assembly includes:

[0018] A flow sensor is provided on the pipeline connecting the heater core and the three-position six-way valve, and is used to monitor the coolant flow in the circuit when the engine coolant is used to heat the battery;

[0019] The first temperature sensor is arranged on the pipeline connecting the chiller and the battery, and is used to detect the coolant temperature at the water inlet of the battery cold plate;

[0020] A second temperature sensor is disposed on a pipeline connecting the engine water jacket outlet and the thermostat, and is used to detect the coolant temperature at the engine water jacket outlet;

[0021] A third temperature sensor is disposed inside the battery and is used to detect the temperature of the battery;

[0022] The controller is used to read the data of the sensor assembly, to control the opening and closing of the pump, to control the opening and closing of the WPTC, and to control the working position and opening degree of the three-position six-way valve.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The thermal management system of the present invention fully utilizes the waste heat of the engine, which not only provides the required heat for the battery and the cabin, but also reduces the consumption of additional energy and improves the energy utilization efficiency.

[0025] The present invention utilizes a warm air core to cool the battery, thereby reducing the use of an air conditioning system, reducing energy consumption and equipment costs. At the same time, the coordinated work between various loops reduces the complexity of the system, further reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the embodiments of the invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0027] Figure 1 A schematic diagram of the system structure of the present invention is shown. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] like Figure 1 As shown, a thermal management solution for a hybrid vehicle includes a battery cooling circuit, an engine cooling circuit, and a cabin heating circuit, wherein the battery cooling circuit and the cabin heating circuit are connected via a solenoid valve;

[0030] By adjusting the solenoid valve, the battery cooling circuit and the engine cooling circuit can be operated independently, and when the battery temperature is low, the coolant in the engine cooling circuit can be used to heat the battery; when the cabin temperature is low, the coolant in the engine cooling circuit can be used to heat the cabin; and when the battery temperature is high, the battery cooling circuit can be connected to the heater core to lower the battery temperature by dissipating heat through the heater core.

[0031] The solenoid valve is a three-position six-way solenoid valve, and is provided with six interfaces a, b, c, d, e, and f. Interface a is connected to the third thermal expansion valve 3, interface b is connected to the third three-way valve 3, interface c is connected to the heater core, interface d is connected to the heater core, interface e is connected to the chiller, and interface f is connected to the WPTC. The solenoid valve has three working positions:

[0032] Position 1: Three flow channels are formed inside the valve, namely the flow channel between interface a and interface c, the flow channel between interface b and interface d, and the flow channel between interface e and interface f. At this time, the engine cooling circuit, cabin heating circuit, and battery cooling circuit operate independently. In the engine cooling circuit, the engine water jacket outlet, thermostat, fourth thermal expansion valve 4, high-temperature radiator, fourth three-way valve 4, third three-way valve 3, engine water pump, and engine water jacket water inlet are connected in sequence; in the cabin heating circuit, the engine water jacket outlet, thermostat, third thermal expansion valve 3, three-position six-way valve interface a, three-position six-way valve interface c, heater core, three-position six-way valve interface d, three-position six-way valve interface b, third three-way valve 3, engine water pump, and engine water jacket water inlet are connected in sequence; in the battery cooling circuit, the battery cold plate outlet, expansion kettle, electronic water pump, WPTC, three-position six-way valve interface f, three-position six-way valve interface e, chiller, and battery cold plate water inlet are connected in sequence, and at the same time, the compressor, condenser, first three-way valve 1, first thermal expansion valve 1, chiller, second three-way valve 2 and the above-mentioned battery cooling circuit together constitute a complete battery cooling cycle.

[0033] Position 2: There are three flow channels inside the valve, namely the flow channel between interface a and interface c, the flow channel between interface b and interface f, and the flow channel between interface d and interface e. In this position, the engine water jacket outlet, thermostat, third thermal expansion valve 3, three-position six-way valve interface a, three-position six-way valve interface c, heater core, three-position six-way valve interface d, three-position six-way valve interface e, chiller, battery cold plate, expansion kettle, electronic water pump, WPTC, three-position six-way valve interface f, three-position six-way valve interface b, third three-way valve 3, engine water pump, and engine water jacket water inlet are connected in sequence to form a battery heating circuit using engine coolant.

[0034] Position 3: There are two flow channels inside the valve, namely the flow channels between interface c and interface e, and the flow channels between interface d and interface f. At this time, the battery cold plate water outlet, expansion kettle, electronic water pump, WPTC, three-position six-way valve interface f, three-position six-way valve interface d, heater core, three-position six-way valve interface c, three-position six-way valve interface e, chiller, and battery cold plate water inlet are connected in sequence to form a battery cooling circuit using the heater core.

[0035] The system of this embodiment is provided with three temperature sensors and one flow sensor. The flow sensor is located on the pipeline connecting the heater core and the three-position six-way valve interface c, and is used to detect the flow in the circuit when the battery is heated by the engine coolant; the first temperature sensor 1 is located on the pipeline connecting the chiller and the battery, and is used to detect the coolant temperature at the water inlet of the battery cold plate; the second temperature sensor 2 is located on the pipeline connecting the engine water jacket outlet and the thermostat, and is used to detect the coolant temperature at the water outlet of the engine water jacket; the third temperature sensor 3 is located inside the battery, and is used to detect the battery temperature.

[0036] Some components in the system are connected to the controller, which is responsible for reading the data of the sensor, controlling the opening and closing of the pump, controlling the opening and closing of the WPTC, and controlling the working position and opening degree of the three-position six-way valve.

[0037] The controller determines whether the battery needs to be heated or cooled based on the data from the third temperature sensor 3 .

[0038] When the cabin temperature is too low and needs to be heated, the controller controls the three-position six-way valve to position one, and the coolant in the engine cooling cycle flows through the heater core to heat the cabin.

[0039] When the battery temperature is too low and needs to be heated, if the coolant temperature in the engine cooling circuit does not reach the required temperature, the controller turns on the WPTC to heat the battery. At this time, the three-position six-way valve is in position one. If the coolant temperature in the engine cooling circuit reaches the required temperature, the controller controls the three-position six-way valve to be in position two, and uses the coolant in the engine cooling circuit to heat the battery. At this time, if the battery coolant temperature sent back by temperature sensor 1 is too high, higher than the temperature range that the battery can withstand, the controller will reduce the opening of the three-position six-way valve and increase the air volume of the heater core to reduce the coolant temperature flowing from the engine cooling circuit so that it is in a temperature range suitable for the battery.

[0040] When the battery temperature is too high and needs to be cooled, the controller controls the three-position six-way valve to position three, and the coolant in the battery cooling circuit flows through the heater core to cool it down. If the battery temperature can be maintained in a suitable range at this time, the controller can turn off the air conditioning system; if the battery temperature cannot be maintained in a suitable range, the controller controls the air conditioning system to turn on to cool the battery.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hybrid vehicle thermal management system, characterized in that: A battery cooling / heating circuit for regulating the battery temperature, an engine cooling circuit for controlling the engine operating temperature, a cabin heating circuit for adjusting the cabin temperature, and a three-position six-way solenoid valve for switching the connection status of each circuit; the three-position six-way solenoid valve is respectively connected to the battery cooling / heating circuit and the cabin heating circuit, and the three-position six-way solenoid valve has six interfaces a, b, c, d, e, and f.

2. The hybrid vehicle thermal management system according to claim 1, characterized in that: The three-position six-way solenoid valve has three working positions, and the working positions are switched by changing the connection relationship between the interfaces.

3. The hybrid vehicle thermal management system according to claim 2, characterized in that: The three working positions include: position one, position two, and position three; When the three-position six-way solenoid valve is in position one, the interface a is connected to the interface c, the interface b is connected to the interface d, and the interface e is connected to the interface f; When the three-position six-way solenoid valve is in position two, the interface a is connected to the interface c, the interface b is connected to the interface f, and the interface d is connected to the interface e; When the three-position six-way solenoid valve is in position three, the interface c is communicated with the interface e, and the interface d is communicated with the interface f.

4. The hybrid vehicle thermal management system according to claim 3, characterized in that: When the three-position six-way solenoid valve is in position one, the engine water jacket water outlet, the thermostat, the fourth thermal expansion valve, the high-temperature radiator, the fourth three-way valve, the third three-way valve, the engine water pump, and the engine water jacket water inlet are sequentially connected to form an engine cooling circuit; The engine water jacket water outlet, the thermostat, the third thermal expansion valve, the three-position six-way solenoid valve, the heater core, the third three-way valve, the engine water pump, and the engine water jacket water inlet are sequentially connected to form a cabin heating circuit; The battery cold plate water outlet, expansion kettle, electronic water pump, WPTC, three-position six-way solenoid valve, chiller, and battery cold plate water inlet are connected in sequence; the compressor, condenser, first three-way valve, first thermal expansion valve, chiller, and second three-way valve are connected in sequence, and the two circuits together constitute a battery cooling circuit.

5. The hybrid vehicle thermal management system according to claim 3, characterized in that: When the three-position six-way solenoid valve is in position two, The engine water jacket water outlet, thermostat, third thermal expansion valve, heater core, chiller, battery cold plate, expansion kettle, electronic water pump, WPTC, three-position six-way solenoid valve, third three-way valve, engine water pump, and engine water jacket water inlet are connected in sequence to form a battery heating circuit using engine coolant.

6. The hybrid vehicle thermal management system according to claim 3, characterized in that: When the three-position six-way solenoid valve is in position three, the battery cold plate water outlet, expansion kettle, electronic water pump, WPTC, three-position six-way solenoid valve, heater core, chiller, and battery cold plate water inlet are connected in sequence to form a battery cooling circuit using the heater core.

7. The hybrid vehicle thermal management system according to claim 1, characterized in that: A sensor assembly and a controller for monitoring system operating parameters are also provided, and the sensor assembly includes: A flow sensor is provided on the pipeline connecting the heater core and the three-position six-way valve, and is used to monitor the coolant flow in the circuit when the engine coolant is used to heat the battery; The first temperature sensor is arranged on the pipeline connecting the chiller and the battery, and is used to detect the coolant temperature at the water inlet of the battery cold plate; A second temperature sensor is disposed on a pipeline connecting the engine water jacket outlet and the thermostat, and is used to detect the coolant temperature at the engine water jacket outlet; A third temperature sensor is disposed inside the battery and is used to detect the temperature of the battery; The controller is used to read the data of the sensor assembly, to control the opening and closing of the pump, to control the opening and closing of the WPTC, and to control the working position and opening degree of the three-position six-way valve.

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