An automotive thermal management system using an eight-way water valve

Abstract

The present invention relates to an automobile thermal management system using an eight-way water valve, including an eight-way valve and an actuator, an electric drive system and a battery system; the eight-way valve includes a valve housing and a valve core, the valve core includes a valve core housing and three partitions, the three partitions divide the valve core into four areas, and there are eight water pipe interfaces on the valve housing, the angle between two adjacent water pipe interfaces is 45 degrees, and the eight water pipe interfaces can be divided into four groups, respectively connected to the radiator, Chiller, electric drive system and battery system four sets of heat exchange circuits; the actuator is provided with a motor, the motor output shaft drives the worm, the worm drives the turbine, the turbine drives the gear to rotate, the gear drives the gear output shaft to rotate, the gear output shaft is connected to the valve core, can drive the valve core to rotate, the valve core rotates at different angles, can connect different water pipe interfaces, and realize mode switching. The present invention uses an eight-way valve to realize mode switching of common working conditions of electric vehicles. It has the advantages of low cost and small flow resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicle thermal management systems, and in particular relates to an automobile thermal management system using an eight-way water valve. Background Art

[0002] In order to improve the driving range, existing pure electric vehicles are equipped with intelligent thermal management systems, which switch the circuit through the water valve to achieve the rational use of the heat of the whole vehicle. The general functions of this thermal management system are as follows: 1. High temperature conditions in summer: the radiator cools the motor and high-voltage accessories, and the air conditioner cools the battery through the Chiller; 2. Low temperature conditions in winter: the heat pump system uses the Chiller to absorb the waste heat generated by the motor operation to heat the passenger compartment; or the battery absorbs the waste heat of the motor system, heats the battery, and increases the battery temperature, thereby improving the driving range; 3. Spring and autumn conditions: the battery temperature is high during or after charging, and heat needs to be dissipated. At this time, the radiator is used to dissipate the heat for the battery, so that the air conditioning system can be started to achieve energy saving.

[0003] As shown in Figure 1, there are 4 states. A1: Summer high temperature condition, the system is independent of the motor cooling and battery cooling system; A2: Winter condition, the motor system water temperature is low and no cooling is required, but generally this state is a transitional state and will not be in this state for a long time; B1: Spring and autumn condition, the motor and battery system are connected in series, and the radiator can be used to dissipate heat for the motor and battery; B2: The heat of the motor can heat the battery, or the heat pump absorbs the heat of the motor and battery through the Chiller system.

[0004] However, the above thermal management system has the following disadvantages: 1. When the system is in B2 working condition, the heat pump starts to absorb system heat through the chiller, which will absorb the heat of the motor and battery at the same time, which will reduce the battery temperature and affect the battery performance. To avoid this problem, it is necessary to add a valve to short-circuit the battery, which is more expensive; 2. When the system is in heat pump mode, the water flow needs to pass through the battery, which has a large flow resistance and consumes more energy; 3. Two water valves are required, which is costly;

[0005] The prior art discloses a thermal management system for a pure electric vehicle, including an electric drive system and charger cooling circuit, a power battery cooling circuit, a power battery charging heating circuit, a passenger compartment heating circuit, and a passenger compartment refrigeration circuit; the electric drive system and charger cooling circuit include a radiator, a fan, and a kettle connected by pipes, an electric drive system and charger cooling water pump arranged in the circuit, a motor controller and DCDC, as well as a charger and a motor, and a radiator is used to realize liquid-gas heat exchange to cool the heat dissipation components. This solves the problem that all systems of pure electric vehicles, especially the power battery system, work within the optimal operating temperature range and simultaneously improve the service life of components in the circuit system.

[0006] The prior art also discloses a thermal management system for pure electric vehicles, including a power battery branch, a heater core branch, a strong current branch, a radiator branch, and a high-voltage electric heater branch. A five-way valve V1 is set between each branch, a first three-way valve V2 is set downstream of the charger, a second three-way valve V3 is set upstream of the high-voltage electric heater, and a fourth three-way valve V5 is set downstream of the drive motor. The system can connect or disconnect each branch by controlling the working mode of the five-way valve and each three-way valve according to the cooling requirements of the power battery under different working conditions. This solves the problem that the various systems of current pure electric vehicles are basically independent of each other. When the battery needs to be heated or the passenger compartment needs to be heated, the system waste heat cannot be effectively utilized, resulting in energy waste and increased system power consumption.

[0007] However, the above thermal management system has a complex structure and cannot achieve mode switching for controlling common operating conditions of electric vehicles with a simple structure. Summary of the invention

[0008] The purpose of the present invention is to provide a low-cost, low-flow-resistance automotive thermal management system using an eight-way water valve to solve the problem of achieving mode switching under common operating conditions of electric vehicles.

[0009] The objective of the present invention is achieved through the following technical solutions:

[0010] An automobile thermal management system using an eight-way water valve comprises an eight-way valve and an actuator; an electric drive system and a battery system;

[0011] The eight-way valve includes a valve housing and a valve core fixed thereto; the valve core includes a valve core housing and three partitions integrally formed therewith, and the three partitions divide the valve core into four areas; there are eight water pipe interfaces on the valve housing, and the angle between two adjacent water pipe interfaces is 45 degrees. The eight water pipe interfaces can be divided into four groups, which are respectively connected to four sets of heat exchange circuits of the radiator, chiller, electric drive system and battery system;

[0012] The actuator is provided with a motor, the motor output shaft drives the worm, the worm drives the turbine, the turbine drives the gear to rotate, the gear drives the gear output shaft to rotate, the gear output shaft is connected to the valve core, and can drive the valve core to rotate. The valve core rotates to different angles and can connect to different water pipe interfaces to achieve mode switching.

[0013] Furthermore, the electric drive system is composed of a DC / DC, a charger, a motor and a water pump I, and the battery system is composed of a heater, a battery and a water pump II.

[0014] Furthermore, the heater is a PTC.

[0015] Furthermore, the valve core is an overall cylindrical shape, three partitions are located at the center of the valve core and are arranged at intervals, and eight openings are opened on the side wall of the valve core.

[0016] Furthermore, the eight water pipe interfaces are respectively fixed in eight openings on the side wall of the valve core.

[0017] Furthermore, a motor and a circuit board are provided in the actuator; the motor is electrically connected to the circuit board, the circuit board can control the forward and reverse rotation of the motor, and the circuit board is also connected to a position sensor and can receive a position sensor signal.

[0018] Furthermore, in working conditions such as high temperature in summer, interface 1 of the eight-way valve is connected to interface 6, interface 2 is connected to interface 5, the electric drive system loop is connected to the radiator, and the radiator dissipates heat for the electric drive system; the battery system loop is connected to Chiller, and the air conditioner dissipates heat for the battery through Chiller.

[0019] Furthermore, in winter and other low temperature conditions, interface 1 of the eight-way valve is connected to interface 4, interface 5 is connected to interface 8, the radiator is connected to the battery system circuit, and the electric drive system circuit is connected to Chiller. The heat pump absorbs the waste heat of the motor system through Chiller as a heat source for heating the passenger compartment. The water pump II of the battery system does not operate, so the water temperature of the battery system will not decrease. During spring and autumn charging and other working conditions, the battery needs to dissipate heat, and the radiator can be used directly to cool the battery. Furthermore, in winter and other low temperature conditions, interface 3 of the eight-way valve is connected to interface 8, interface 4 is connected to interface 7, the electric drive system circuit is connected to the battery system circuit, and when the battery temperature is low, the waste heat of the electric drive system can be used to heat the battery.

[0020] Furthermore, in the battery heating mode, the interface 1 of the eight-way valve is connected to the interface 6, the interface 2 is connected to the interface 5, and the radiator is connected to the chiller.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The automobile thermal management system of the present invention uses an eight-way water valve, and can realize mode switching of common working conditions of electric vehicles by using one eight-way valve, and has the advantages of low cost, small flow resistance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1a-1d Schematic diagram of four states of thermal management system of pure electric vehicle in prior art;

[0025] Figure 2 Schematic diagram of eight-way valve;

[0026] Figure 3 Schematic diagram of the internal flow status of the eight-way valve;

[0027] Figure 4 Mode 1 system schematic diagram;

[0028] Figure 5 Mode 2 system schematic diagram;

[0029] Figure 6 Mode 3 system schematic diagram;

[0030] Figure 7 Mode 4 system schematic diagram;

[0031] Figure 8 Schematic diagram of the location of the actuator, valve housing and actuator;

[0032] Fig. 9 Schematic diagram of the switching of the eight-way valve into four states. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with embodiments:

[0034] like Figure 2-Figure 3 As shown, the automotive thermal management system of the present invention uses an eight-way water valve, including an eight-way valve and an actuator, and also includes a DC / DC, a charger, a motor, a radiator, a heater, a chiller, a battery and two water pumps.

[0035] The DC / DC, charger, motor and water pump I form an electric drive system; the heater, battery and water pump II form a battery system. The heater is a PTC.

[0036] The eight-way valve comprises a valve housing and a valve core, and the valve core is fixed to the valve housing.

[0037] The valve core is an overall cylindrical shape, including a valve core shell and three partitions formed integrally therewith. The three partitions are located at the center of the valve core and are arranged at intervals to divide the valve core into four areas. There are eight openings on the side wall of the valve core;

[0038] The valve housing is provided with 8 water pipe interfaces, the angle between two adjacent water pipe interfaces is 45 degrees, and the 8 water pipe interfaces are respectively fixed to the 8 openings on the side wall of the valve core.

[0039] The actuator is provided with a motor and a circuit board; the motor is electrically connected to the circuit board, the circuit board can control the forward and reverse rotation of the motor, and the circuit board is also connected to a position sensor and can receive a signal from the position sensor.

[0040] The motor output shaft drives the worm, the worm drives the turbine, the turbine drives the gear to rotate, the gear drives the gear output shaft to rotate, the gear output shaft is connected to the valve core, and can drive the valve core to rotate. The valve core rotates to different angles and can connect to different water pipe interfaces, thereby realizing mode switching.

[0041] The 8 water pipe interfaces can be divided into 4 groups, which are respectively connected to the 4 heat exchange circuits of the radiator, chiller, electric drive system and battery system.

[0042] The automotive thermal management system has 4 working modes:

[0043] 1. In summer, when the temperature is high, the eight-way valve is in Figure 4 In the state, interface 1 is connected to interface 6, and interface 2 is connected to interface 5. At this time, the electric drive system circuit is connected to the radiator, and the radiator dissipates heat for the electric drive system; the battery system circuit is connected to the chiller, and the air conditioner dissipates heat for the battery through the chiller (the heater does not work).

[0044] 2. In winter, when the temperature is low, the eight-way valve is in Figure 5 In the state of , interface 1 is connected to interface 4, and interface 5 is connected to interface 8. At this time, the radiator is connected to the battery system circuit, and the electric drive system circuit is connected to Chiller. The heat pump needs to absorb the waste heat of the motor system through Chiller as a heat source for heating the passenger compartment. At this time, the water pump II of the battery system is not running, so the water temperature of the battery system will not decrease. In addition, when charging in spring and autumn, the battery needs to dissipate heat, and the radiator can be used directly to cool the battery.

[0045] 3. In winter, under low temperature and other working conditions, the eight-way valve is in Figure 6 In the state of , interface 3 is connected to interface 8, and interface 4 is connected to interface 7. At this time, the electric drive system circuit is connected to the battery system circuit. When the battery temperature is low, the waste heat of the electric drive system can be used to heat the battery.

[0046] 4. Battery heating mode, eight-way valve is in Figure 7 In the state, interface 1 is connected to interface 6, and interface 2 is connected to interface 5. At this time, the radiator is connected to the chiller. When the battery needs to be heated, the flow resistance of the battery system is small, which saves energy.

[0047] The eight-way valve can be used as follows Fig. 9 The four states shown in the figure are switched, with each rotation of 45 degrees being one state.

[0048] The present invention can realize switching among four modes, and can realize independent operation of the motor and battery system, or the motor can heat the chiller or battery, or the radiator can heat the battery, etc. The present invention directly simplifies the traditional multiple valve scheme into one 8-way valve to realize the above functions.

[0049] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An automotive thermal management system using an eight-way water valve, characterized in that: It includes an eight-way valve and an actuator; it also includes an electric drive system and a battery system; The eight-way valve includes a valve housing and a valve core fixed thereto; the valve core includes a valve core housing and three partitions integrally formed therewith, and the three partitions divide the valve core into four areas; there are eight water pipe interfaces on the valve housing, and the angle between two adjacent water pipe interfaces is 45 degrees. The eight water pipe interfaces can be divided into four groups, which are respectively connected to four sets of heat exchange circuits of the radiator, chiller, electric drive system and battery system; The actuator is provided with a motor, the motor output shaft drives the worm, the worm drives the turbine, the turbine drives the gear to rotate, the gear drives the gear output shaft to rotate, the gear output shaft is connected to the valve core, and can drive the valve core to rotate. The valve core rotates at different angles to connect different water pipe interfaces, thereby realizing the switching of four working modes; Mode I, during high temperature working conditions in summer, interface 1 of the eight-way valve is connected to interface 8, interface 2 is connected to interface 7, interface 3 is connected to interface 6, interface 4 is connected to interface 5, the electric drive system circuit is connected to the radiator, the radiator dissipates heat for the electric drive system, the battery system circuit is connected to Chiller, and the air conditioner dissipates heat for the battery through Chiller; Mode II, during low temperature working conditions in winter, interface 1 of the eight-way valve is connected to interface 4, interface 5 is connected to interface 8, interface 2 is connected to interface 3, interface 6 is connected to interface 7, the radiator is connected to the battery system circuit, the electric drive system circuit is connected to Chiller, and the heat pump absorbs waste heat from the motor system through Chiller as heat for heating the passenger compartment. Source, water pump II of the battery system does not run, so the water temperature of the battery system will not decrease. During charging conditions in spring and autumn, the battery needs to dissipate heat, and the radiator is used directly to cool the battery; Mode III, during low temperature conditions in winter, interface three of the eight-way valve is connected to interface eight, interface four is connected to interface seven, interface five is connected to interface six, interface one is connected to interface two, the electric drive system circuit is connected to the battery system circuit, and when the battery temperature is low, the waste heat of the electric drive system is used to heat the battery; Mode IV, battery heating mode, interface one of the eight-way valve is connected to interface six, interface two is connected to interface five, interface three is connected to interface four, interface seven is connected to interface eight; the battery is heated by a heater, and the radiator is connected to Chiller.

2. The automotive thermal management system using an eight-way water valve according to claim 1, characterized in that: The electric drive system is composed of a DC / DC, a charger, a motor and a water pump I, and the battery system is composed of a heater, a battery and a water pump II.

3. The automotive thermal management system using an eight-way water valve according to claim 2, characterized in that: The heater is a PTC.

4. The automotive thermal management system using an eight-way water valve according to claim 1, characterized in that: The valve core is an integral cylindrical shape, and three partitions are located at the center of the valve core and are arranged at intervals. Eight openings are opened on the side wall of the valve core.

5. The automotive thermal management system using an eight-way water valve according to claim 1, characterized in that: The eight water pipe interfaces are respectively connected to the eight openings on the side wall of the valve core.

6. The automotive thermal management system using an eight-way water valve according to claim 1, characterized in that: The actuator is provided with a motor and a circuit board; the motor is electrically connected to the circuit board, the circuit board can control the forward and reverse rotation of the motor, and the circuit board is also connected to a position sensor and can receive a signal from the position sensor.

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