阅读说明：本技术 一种适用于电动汽车的液冷控制方法及系统 (Liquid cooling control method and system suitable for electric automobile ) 是由 崔志冰 史来锋 赵征澜 杨问弘 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种适用于电动汽车的液冷控制方法及系统,包括：三条并联的冷却回路；其中,第一冷却回路上串联有电机相关组件和第一比例阀门；第二冷却回路上串联车载充电机OBC和第二比例阀门；第三冷却回路上串联动力电池和第三比例阀门；三条并联的冷却回路的一端共同连接散热器,三条并联的冷却回路的另一端共同连接散热阀门；散热器和散热阀门串联；在降温的过程中,根据冷却需求控制三条并联的冷却回路中的任意一条或者多条冷却回路中的器件进行散热。(The invention discloses a liquid cooling control method and system suitable for an electric automobile, which comprises the following steps: three parallel cooling circuits; wherein, the first cooling loop is connected with the related components of the motor and a first proportional valve in series; the second cooling loop is connected with a vehicle-mounted charger OBC and a second proportional valve in series; the third cooling loop is connected with a power battery and a third proportional valve in series; one ends of the three parallel cooling loops are connected with the radiator, and the other ends of the three parallel cooling loops are connected with the radiating valve; the radiator is connected with the radiating valve in series; in the process of temperature reduction, any one or more devices in the three parallel cooling loops are controlled to dissipate heat according to the cooling requirement.)

1. The utility model provides a liquid cooling control system suitable for electric automobile which characterized in that includes:

three parallel cooling circuits; wherein, the first cooling loop is connected with the related components of the motor and a first proportional valve in series; the second cooling loop is connected with a vehicle-mounted charger OBC and a second proportional valve in series; the third cooling loop is connected with a power battery and a third proportional valve in series;

one ends of the three parallel cooling loops are connected with a radiator, and the other ends of the three parallel cooling loops are connected with a radiating valve; the radiator and the radiating valve are connected in series;

in the process of temperature reduction, the device in any one or more of the three parallel cooling loops is controlled to dissipate heat according to the cooling requirement.

2. The liquid cooling control system of claim 1, wherein the system further comprises:

the heater PTC is connected with the radiator in series and is used for heating any one or more of the three parallel cooling loops;

and one end of the bypass valve is connected between the PTC and the radiator, and the other end of the bypass valve is connected with the heat radiation valve.

3. The liquid cooling control system of claim 2, wherein the system further comprises: and the pump is connected with the heat dissipation valve in series, and the other end of the bypass valve is connected with the pump.

4. The liquid cooling control system of claim 1, wherein the motor related components comprise: a motor, a motor controller;

and the second cooling circuit is also connected with a DC-DC in series.

5. A liquid cooling control method for an electric vehicle, wherein the method is applied to the liquid cooling control system for the electric vehicle according to any one of claims 1 to 4; the method comprises the following steps:

in the driving process, if the devices in the three parallel cooling loops need to dissipate heat, the radiators and the heat dissipation valves are controlled to be opened, and the opening degrees of the first proportional valve, the second proportional valve and the third proportional valve are adjusted according to the cooling requirements of the cooling loops.

6. The liquid cooling control method of claim 5, wherein during driving, if the OBC and the motor related components in the three parallel cooling circuits need to dissipate heat, the third proportional valve is controlled to be closed, the radiator and the heat dissipation valve are controlled to be opened, and the opening degrees of the first proportional valve and the second proportional valve are adjusted according to the cooling requirements of the cooling circuits.

7. The liquid cooling control method of claim 5, wherein in a charging state, if both the power battery and the OBC need to dissipate heat, the first proportional valve is controlled to be closed, the radiator and the heat dissipation valve are controlled to be opened, and the opening degrees of the second proportional valve and the third proportional valve are adjusted according to the cooling requirement of each cooling loop.

8. The liquid cooling control method of claim 5, wherein in a charging state, if the OBC needs to dissipate heat, the first proportional valve and the third proportional valve are controlled to be closed, the radiator and the heat dissipation valve are controlled to be opened, and the opening degree of the second proportional valve is adjusted according to cooling requirements.

9. The liquid cooling control method of claim 5, wherein in the park state, if the OBC needs to passively dissipate heat, the first proportional valve, the heat dissipation valve and the radiator are controlled to be closed, and the second proportional valve and the third proportional valve are controlled to be opened, so that heat of the OBC is transmitted to the power battery.

10. The liquid cooling control method of claim 5, wherein in the park state, if the power battery needs to be kept warm, the heat dissipation valve and the radiator are controlled to be closed, the first proportional valve, the second proportional valve and the third proportional valve are controlled to be opened, and heat of the OBC and related components of the motor is transmitted to the power battery.

Technical Field

The application relates to the technical field of vehicles, in particular to a liquid cooling control method and system suitable for an electric automobile.

Background

At present, the problems of environmental pollution, energy consumption and the like are more and more emphasized, so that the electric automobile is produced at the same time. Compared with the traditional automobile, the electric automobile has the characteristic of no exhaust emission, has small influence on the environment, and has some development bottlenecks at the present stage. For example, components such as a power battery and an electric drive of an electric vehicle need to be cooled after a long time of operation, and when the external ambient temperature is low, the components such as the power battery and the electric drive need to be heated in advance when the electric vehicle is started and charged.

The existing mode is that all parts are controlled to cool (or heat) automatically, that is, a power battery pack cooling system and an electric drive module cooling system are not related to each other, so that energy of an electric automobile is consumed excessively, and the effects of energy conservation and emission reduction are not achieved.

Disclosure of Invention

The invention provides a liquid cooling control method and system suitable for an electric automobile, and aims to solve or partially solve the technical problem that a cooling system in the prior art cannot save energy and reduce emission.

In order to solve the above technical problem, the present invention provides a liquid cooling control system for an electric vehicle, including:

three parallel cooling circuits; wherein, the first cooling loop is connected with the related components of the motor and a first proportional valve in series; the second cooling loop is connected with a vehicle-mounted charger OBC and a second proportional valve in series; the third cooling loop is connected with a power battery and a third proportional valve in series;

one ends of the three parallel cooling loops are connected with a radiator, and the other ends of the three parallel cooling loops are connected with a radiating valve; the radiator and the radiating valve are connected in series;

in the process of temperature reduction, the device in any one or more of the three parallel cooling loops is controlled to dissipate heat according to the cooling requirement.

Preferably, the system further comprises:

the heater PTC is connected with the radiator in series and is used for heating any one or more of the three parallel cooling loops;

and one end of the bypass valve is connected between the PTC and the radiator, and the other end of the bypass valve is connected with the heat radiation valve.

Preferably, the system further comprises: and the pump is connected with the heat dissipation valve in series, and the other end of the bypass valve is connected with the pump.

Preferably, the motor related assembly includes: a motor, a motor controller;

and the second cooling circuit is also connected with a DC-DC in series.

In another aspect of the invention, a liquid cooling control method for an electric vehicle is disclosed, wherein the method is applied to the liquid cooling control system for the electric vehicle as described above; the method comprises the following steps:

in the driving process, if the devices in the three parallel cooling loops need to dissipate heat, the radiators and the heat dissipation valves are controlled to be opened, and the opening degrees of the first proportional valve, the second proportional valve and the third proportional valve are adjusted according to the cooling requirements of the cooling loops.

Preferably, in the driving process, if the motor related components and the OBC in the three parallel cooling loops need to dissipate heat, the third proportional valve is controlled to be closed, the radiator and the heat dissipation valve are controlled to be opened, and the opening degrees of the first proportional valve and the second proportional valve are adjusted according to the cooling requirements of the cooling loops.

Preferably, in a charging state, if the power battery and the OBC both need to dissipate heat, the first proportional valve is controlled to be closed, the radiator and the heat dissipation valve are controlled to be opened, and the opening degrees of the second proportional valve and the third proportional valve are adjusted according to the cooling requirements of the cooling loops.

Preferably, in a charging state, if the OBC needs to dissipate heat, the first proportional valve and the third proportional valve are controlled to be closed, the radiator and the heat dissipation valve are controlled to be opened, and the opening degree of the second proportional valve is adjusted according to a cooling demand.

Preferably, in the parking state, if the OBC needs passive heat dissipation, the first proportional valve, the heat dissipation valve and the radiator are controlled to be closed, the second proportional valve and the third proportional valve are controlled to be opened, and heat of the OBC is transmitted to the power battery.

Preferably, in the parking state, if the power battery needs to be kept warm, the heat dissipation valve and the radiator are controlled to be closed, the first proportional valve, the second proportional valve and the third proportional valve are controlled to be opened, and the heat of the OBC and points and related components is transmitted to the power battery.

Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:

the invention discloses a liquid cooling control method and system suitable for an electric automobile, which comprises the following steps: three parallel cooling circuits; wherein, the first cooling loop is connected with the related components of the motor and a first proportional valve in series; the second cooling loop is connected with a vehicle-mounted charger OBC and a second proportional valve in series; the third cooling loop is connected with a power battery and a third proportional valve in series; one ends of the three parallel cooling loops are connected with a radiator, and the other ends of the three parallel cooling loops are connected with a radiating valve; the radiator and the radiating valve are connected in series; in the process of temperature reduction, the device in any one or more of the three parallel cooling loops is controlled to dissipate heat according to the cooling requirement. Therefore, the embodiment of the invention can use the same radiator to control the cooling flow according to different cooling requirements of each loop, thereby achieving the purpose of radiating the heat of any one or more devices in the cooling loops according to different cooling requirements.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a circuit diagram of a liquid cooling control system for an electric vehicle according to an embodiment of the present invention.

Description of reference numerals: the system comprises a bypass valve 1, a PTC2, a radiator 3, a heat dissipation valve 4, a pump 5, an M & MCU6, a first proportional valve 7, an OBC & DC-DC8, a second proportional valve 9, a power battery 10 and a third proportional valve 11.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

DC-DC: a DC-DC converter.

And (3) OBC: vehicle-mounted charger.

PTC: a dc PTC heater.

M: an electric motor.

MCU: a motor controller.

In order to achieve the purpose of energy conservation and emission reduction, the embodiment of the invention discloses a liquid cooling control system suitable for an electric automobile, wherein multiple devices needing heat dissipation are associated into the same cooling system, different heat dissipation requirements of the multiple devices can be realized by using one radiator 3, and different control of cooling flow can be realized.

In a specific structure, referring to fig. 1, a system according to an embodiment of the present invention includes:

three parallel cooling circuits; wherein, the first cooling loop is connected with the related components of the motor and a first proportional valve 7 in series; the second cooling loop is connected with a vehicle-mounted charger OBC and a second proportional valve 9 in series; and the third cooling loop is connected with a power battery 10 and a third proportional valve 11 in series.

In a specific implementation, the motor related component includes: m & MCU 6. Wherein "&" is the meaning of and. And the second cooling loop is also connected with a DC-DC in series. The motor (or the motor controller), the DC-DC (or the vehicle-mounted charger OBC) and the power battery 10 of the embodiment of the invention belong to different cooling loops and have different cooling requirements respectively.

One ends of the three parallel cooling loops are connected with a radiator 3 together, and the other ends of the three parallel cooling loops are connected with a heat dissipation valve 4 together; the radiator 3 and the radiating valve 4 are connected in series. Further, the system also comprises a pump 5 connected with the heat dissipation valve 4 in series, and the other end of the bypass valve 1 is connected with the pump 5.

In the process of temperature reduction, the device in any one or more of the three parallel cooling loops is controlled to dissipate heat according to the cooling requirement. Therefore, the same radiator 3 can be used for controlling the cooling flow according to different cooling requirements of each loop, and the purpose of radiating the heat of any one or more devices in the cooling loops according to different cooling requirements is further achieved.

Further, the system further comprises:

and the heater PTC2 is connected in series with the radiator 3 and is used for heating any one or more of the three parallel cooling loops.

And a bypass valve 1, wherein one end of the bypass valve 1 is connected between the PTC2 and the radiator 3, and the other end of the bypass valve 1 is connected with the radiator valve 4.

When heating is needed, the PTC2 and the bypass valve 1 can be used for heating the devices in the cooling loops according to different heating requirements.

On the basis of the structure, the embodiment of the invention also discloses a liquid cooling control method suitable for the electric automobile, which describes the implementation principle of cooling (or heating) from different states of the automobile, and particularly refers to the following description. It is to be noted that in each of the following cooling embodiments, PTC2 and bypass valve 1 need to be closed, i.e. the heating circuit needs to be closed.

The following is a detailed description.

During driving, the power battery 10, the OBC & DC-DC8 and related components of the motor all work, so heat is generated.

If all the devices in the three parallel cooling loops need to dissipate heat, the radiator 3 and the heat dissipation valve 4 are controlled to be opened, and the opening degrees of the first proportional valve 7, the second proportional valve 9 and the third proportional valve 11 are adjusted according to the cooling requirements of the cooling loops, so that the power battery 10, the OBC and DC-DC8 and the related components of the motor can simultaneously dissipate heat. It can be seen that the present embodiment can arrange the power battery 10, the OBC & DC-DC8, and the related components of the motor in one cooling system, and simultaneously realize the control of the flows of the three cooling loops.

As an alternative embodiment, if the motor related components and OBC & DC-DC8 in the three parallel cooling loops need to dissipate heat, the temperature of the power battery 10 pack is in a reasonable range (not too hot and too cold). And controlling to close the third proportional valve 11, controlling to open the radiator 3 and the heat dissipation valve 4, and adjusting the opening degrees of the first proportional valve 7 and the second proportional valve 9 according to the cooling requirements of the cooling loops to realize the heat dissipation of the OBC & DC-DC8 and the related components of the motor.

In the charging state, the power battery 10, the OBC & DC-DC8 are active and the motor related components are inactive.

If the electric automobile is in direct current fast charging or in the high temperature environment when exchanging and slowly charging, power battery 10, OBC & DC-DC8 all need the heat dissipation, control closes first proportional valve 7 to control radiator 3 and heat dissipation valve 4 to open, and adjust according to the cooling demand of each cooling circuit second proportional valve 9, the aperture of third proportional valve 11 realizes power battery 10, OBC & DC-DC8 heat dissipation.

If the electric automobile is in low temperature and normal temperature alternating current and is slowly charged, the battery does not need to dissipate heat, and when the OBC & DC-DC8 needs to dissipate heat, the first proportional valve 7 and the third proportional valve 11 are controlled to be closed, the radiator 3 and the heat dissipation valve 4 are controlled to be opened, the opening degree of the second proportional valve 9 is adjusted according to cooling requirements, and the OBC & DC-DC8 heat dissipation is achieved.

In the parking state, the power battery 10, the OBC & DC-DC8 and the related components of the motor are not operated.

If the vehicle is stopped, the temperature of the power battery 10 is not overheated and does not exceed the temperature set value of passive heat dissipation, the heat of the OBC & DC-DC8 is transmitted to the power battery 10 through the cooling loop, the passive heat dissipation of the OBC & DC-DC8 is realized, the first proportional valve 7, the heat dissipation valve 4 and the radiator 3 are controlled to be closed, the second proportional valve 9 and the third proportional valve 11 are controlled to be opened, and the heat of the OBC is transmitted to the power battery 10.

If the external environment temperature is low, after the vehicle stops, the power battery 10 needs to be kept warm, and the heat of the OBC & DC-DC8 and related components of the motor is transferred to the power battery 10 through a cooling loop. The heat dissipation valve 4 and the heat radiator 3 are controlled to be closed, the first proportional valve 7, the second proportional valve 9 and the third proportional valve 11 are controlled to be opened, the OBC and the heat of points and related components are transmitted to the power battery 10, and the heat preservation of the power battery 10 is achieved. It can be seen that the recovery of waste heat from the OBC & DC-DC8 and motor related components may increase the power cell 10 warm-up time.

And when the external environment temperature is low, the power battery 10 needs to be heated before the vehicle is started or before the direct current quick charging, the radiator 3, the heat dissipation valve 4, the first proportional valve 7 and the second proportional valve 9 are controlled to be closed, the PTC2, the bypass valve 1 and the third proportional valve 11 are controlled to be opened, and the power battery 10 is heated.

Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:

according to the embodiment of the invention, the radiator is used for radiating a plurality of different devices, so that the cost can be saved, the arrangement space can be saved, and different control of cooling flow in each cooling loop can be realized, so as to meet different radiating requirements of the plurality of devices.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.