阅读说明：本技术 一种冷却系统及冷却方法 (Cooling system and cooling method ) 是由 徐利文 曲万达 陈丽君 赵强 张国栋 张延恢 于海洋 于 2021-09-01 设计创作，主要内容包括：本发明属于汽车技术领域,公开了一种冷却系统及冷却方法。冷却系统包括散热器、第一风扇、第二风扇、循环水泵以及水冷控制器,第一风扇和第二风扇均设置在散热器上,循环水泵、散热器、动力电池、电机控制器以及动力电机串联,循环水泵连接于散热器的进水口,动力电池连接于散热器的出水口,第一风扇、第二风扇、循环水泵、动力电池以及电机控制器均电连接于水冷控制器。本发明提供的冷却方法,包括四个步骤,分别对应了四种工作模式,车辆启动时,水冷控制器根据采集的各个温度,综合计算判断、统筹协调,控制循环水泵和风扇工作在相应的模式下。(The invention belongs to the technical field of automobiles, and discloses a cooling system and a cooling method. The cooling system comprises a radiator, a first fan, a second fan, a circulating water pump and a water-cooling controller, wherein the first fan and the second fan are arranged on the radiator, the circulating water pump, the radiator, a power battery, a motor controller and a power motor are connected in series, the circulating water pump is connected to a water inlet of the radiator, the power battery is connected to a water outlet of the radiator, and the first fan, the second fan, the circulating water pump, the power battery and the motor controller are electrically connected to the water-cooling controller. The cooling method provided by the invention comprises four steps which respectively correspond to four working modes, and when a vehicle is started, the water cooling controller comprehensively calculates, judges and integrally coordinates according to the collected temperatures, and controls the circulating water pump and the fan to work in the corresponding modes.)

1. The cooling system is characterized by comprising a radiator (1), a first fan (2), a second fan (3), a circulating water pump (4) and a water cooling controller (5), wherein the first fan (2) and the second fan (3) are arranged on the radiator (1), the circulating water pump (4), the radiator (1), a power battery (6), a motor controller (7) and a power motor (8) are connected in series, the circulating water pump (4) is connected to a water inlet of the radiator (1), the power battery (6) is connected to a water outlet of the radiator (1), and the first fan (2), the second fan (3), the circulating water pump (4), the power battery (6) and the motor controller (7) are electrically connected to the water cooling controller (5).

2. The cooling system according to claim 1, characterized in that the water-cooling controller (5) comprises a signal acquisition module, to which both the power battery (6) and the motor controller (7) are electrically connected.

3. The cooling system according to claim 1, wherein a plurality of output pins are arranged on the water-cooling controller (5), and the circulating water pump (4), the first fan (2) and the second fan (3) are respectively connected to the output pins in a one-to-one correspondence manner.

4. A cooling method using the cooling system according to any one of claims 1 to 3, comprising the steps of:

s1, after the power supply is powered on for a certain time, the water-cooling controller (5) collects the temperature of the power battery (6) and the temperature of the motor controller (7), and if the temperature of the power battery (6) and the temperature of the motor controller (7) are lower than a first temperature set value, the first fan (2), the second fan (3) and the circulating water pump (4) are all closed;

s2, the water-cooling controller (5) continuously collects the temperature of the power battery (6) and the temperature of the motor controller (7), if the temperature of the power battery (6) or the temperature of the motor controller (7) is greater than the first temperature set value, the circulating water pump (4) is started, after a certain time, the judgment is carried out again, if the temperature of the power battery (6) and the temperature of the motor controller (7) are both lower than the first temperature set value, the circulating water pump (4) is stopped, and if the temperature of the power battery (6) or the temperature of the motor controller (7) is greater than the first temperature set value, the state is maintained;

s3, if the temperature of the power battery (6) or the temperature of the motor controller (7) is larger than a second temperature set value, starting the first fan (2), enabling the circulating water pump (4) and the first fan (2) to work together, judging again after a certain time, if the temperature of the power battery (6) and the temperature of the motor controller (7) are both lower than the second temperature set value, closing the first fan (2), and if the temperature of the power battery (6) or the temperature of the motor controller (7) is larger than the second temperature set value, maintaining the state;

S4, if the temperature of the power battery (6) or the temperature of the motor controller (7) is greater than a third temperature set value, the second fan (3) is started to enable the circulating water pump (4), the first fan (2) and the second fan (3) to work together, after a certain time, the judgment is carried out again, if the temperature of the power battery (6) and the temperature of the motor controller (7) are both lower than the third temperature set value, the second fan (3) is stopped, and if the temperature of the power battery (6) or the temperature of the motor controller (7) is greater than the third temperature set value, the state is maintained.

5. The cooling method according to claim 4, wherein the water-cooling controller (5) calculates a temperature rise rate of the power battery (6) and a temperature rise rate of the motor controller (7), the water-cooling controller (5) is provided with a first temperature rise rate comparison value, and in step S1, if the temperature rise rate of the power battery (6) or the temperature rise rate of the motor controller (7) is greater than the first temperature rise rate comparison value, the flow proceeds to step S2, and the circulating water pump (4) is turned on.

6. The cooling method according to claim 5, wherein the water-cooling controller (5) performs calculation to adjust the rotation speed of the circulation water pump (4) according to Kg x (Tg-Ts1) or Kf x (Tf-Ts1), wherein Kg represents the temperature rise rate of the power battery (6), Tg represents the temperature of the power battery (6), Ts1 represents the first temperature preset value, Kf represents the temperature rise rate of the motor controller (7), and Tf represents the temperature of the motor controller (7).

7. The cooling method according to claim 5, wherein the water-cooling controller (5) is provided with a second temperature rise rate comparison value, and in step S2, if the temperature rise rate of the power battery (6) or the temperature rise rate of the motor controller (7) is greater than the second temperature rise rate comparison value, the process proceeds to step S3, and the first fan (2) is turned on.

8. The cooling method according to claim 7, wherein the water-cooling controller (5) performs calculation to adjust the rotation speed of the first fan (2) according to Kg x (Tg-Ts2) or Kf x (Tf-Ts2), wherein Kg represents the temperature rise rate of the power battery (6), Tg represents the temperature of the power battery (6), Ts2 represents the second temperature preset value, Kf represents the temperature rise rate of the motor controller (7), and Tf represents the temperature of the motor controller (7).

9. The cooling method according to claim 5, wherein the water-cooling controller (5) is provided with a third temperature increase rate comparison value, and if the temperature increase rate of the power battery (6) or the temperature increase rate of the motor controller (7) is greater than the third temperature increase rate comparison value in step S3, the process proceeds to step S4, and the second fan (3) is turned on.

10. The cooling method according to claim 9, wherein the water-cooling controller (5) performs calculation to adjust the rotation speed of the second fan (3) according to Kg x (Tg-Ts3) or Kf x (Tf-Ts3), where Kg represents the temperature rise rate of the power battery (6), Tg represents the temperature of the power battery (6), Ts3 represents the third temperature preset value, Kf represents the temperature rise rate of the motor controller (7), and Tf represents the temperature of the motor controller (7).

Technical Field

The invention relates to the technical field of automobiles, in particular to a cooling system and a cooling method.

Background

New energy vehicles (i.e., electric vehicles) use motors as direct power sources. In the driving process, a driving motor, a motor controller and a power battery of the new energy automobile can generate a large amount of heat, and in order to ensure the performance of the new energy automobile, the driving motor, the motor controller and the power battery need to be cooled.

At present, a cooling system of an automobile includes a radiator, a plurality of cooling fans, and a plurality of circulating water pumps, and a motor, a motor controller, and a battery are connected in series with the cooling system to be cooled. However, the cooling system is provided with a plurality of cooling fan controllers and a plurality of water pump controllers corresponding to a plurality of cooling fans and a plurality of water circulating pumps, so as to control the cooling fans and the water circulating pumps respectively, and the cooling system has low integration level, high cost and is not favorable for arrangement and assembly. And radiator fan and circulating water pump work independently, and the overall coordination is poor, and the energy consumption is high.

Disclosure of Invention

The invention aims to provide a cooling system, which increases the integration level of the cooling system and reduces the energy consumption of an automobile.

In order to achieve the purpose, the invention adopts the following technical scheme:

the cooling system comprises a radiator, a first fan, a second fan, a circulating water pump and a water-cooling controller, wherein the first fan and the second fan are all arranged on the radiator, the circulating water pump, the radiator, a power battery, a motor controller and a power motor are connected in series, the circulating water pump is connected to a water inlet of the radiator, the power battery is connected to a water outlet of the radiator, and the first fan, the second fan, the circulating water pump, the power battery and the motor controller are all electrically connected to the water-cooling controller.

Preferably, the water-cooling controller comprises a signal acquisition module, and the power battery and the motor controller are electrically connected to the signal acquisition module.

Preferably, the water-cooling controller is provided with a plurality of output pins, and the circulating water pump, the first fan and the second fan are connected to the output pins in a one-to-one correspondence manner.

Another object of the present invention is to provide a cooling method using the cooling system described above, thereby reducing the energy consumption of the vehicle.

A cooling method using the cooling system as described above, comprising the steps of:

s1, after electrifying for a certain time, the water-cooling controller collects the temperature of the power battery and the temperature of the motor controller, and if the temperature of the power battery and the temperature of the motor controller are lower than a first temperature set value, the first fan, the second fan and the circulating water pump are all closed;

s2, the water-cooling controller continuously collects the temperature of the power battery and the temperature of the motor controller, if the temperature of the power battery or the temperature of the motor controller is greater than the first temperature set value, the circulating water pump is started, after a certain time, the judgment is carried out again, if the temperature of the power battery and the temperature of the motor controller are both lower than the first temperature set value, the circulating water pump is stopped, and if the temperature of the power battery or the temperature of the motor controller is greater than the first temperature set value, the state is maintained;

S3, if the temperature of the power battery or the temperature of the motor controller is larger than a second temperature set value, starting the first fan to enable the circulating water pump and the first fan to work together, judging again after a certain time, if the temperature of the power battery and the temperature of the motor controller are both lower than the second temperature set value, closing the first fan, and if the temperature of the power battery or the temperature of the motor controller is larger than the second temperature set value, maintaining the state;

and S4, if the temperature of the power battery or the temperature of the motor controller is greater than a third temperature set value, starting the second fan to enable the circulating water pump, the first fan and the second fan to work together, judging again after a certain time, if the temperature of the power battery and the temperature of the motor controller are both lower than the third temperature set value, closing the second fan, and if the temperature of the power battery or the temperature of the motor controller is greater than the third temperature set value, maintaining the state.

Preferably, the water-cooling controller calculates a temperature rise rate of the power battery and a temperature rise rate of the motor controller, the water-cooling controller is provided with a first temperature rise rate comparison value, and in step S1, if the temperature rise rate of the power battery or the temperature rise rate of the motor controller is greater than the first temperature rise rate comparison value, the process proceeds to step S2, and the circulating water pump is started.

Preferably, the water-cooling controller performs calculation to adjust the rotation speed of the circulation water pump according to Kg x (Tg-Ts1) or kfx (Tf-Ts1), where Kg represents a temperature rise rate of the power battery, Tg represents a temperature of the power battery, Ts1 represents the first temperature preset value, Kf represents a temperature rise rate of a motor controller, and Tf represents a temperature of the motor controller.

Preferably, the water-cooling controller is provided with a second temperature rise rate comparison value, and in step S2, if the temperature rise rate of the power battery or the temperature rise rate of the motor controller is greater than the second temperature rise rate comparison value, the process proceeds to step S3, and the first fan is turned on.

Preferably, the water-cooling controller performs calculation to adjust the rotation speed of the first fan according to Kg x (Tg-Ts2) or kfx (Tf-Ts2), where Kg represents a temperature rise rate of the power battery, Tg represents a temperature of the power battery, Ts2 represents the second temperature preset value, Kf represents a temperature rise rate of the motor controller, and Tf represents a temperature of the motor controller.

Preferably, the water-cooling controller is provided with a third temperature rise rate comparison value, and in step S3, if the temperature rise rate of the power battery or the temperature rise rate of the motor controller is greater than the third temperature rise rate comparison value, the process proceeds to step S4, and the second fan is turned on.

Preferably, the water-cooling controller calculates to adjust the rotation speed of the second fan according to Kg x (Tg-Ts3) or kfx (Tf-Ts3), where Kg represents a temperature rise rate of the power battery, Tg represents a temperature of the power battery, Ts3 represents the third temperature preset value, Kf represents a temperature rise rate of the motor controller, and Tf represents a temperature of the motor controller.

The invention has the beneficial effects that:

according to the cooling system provided by the invention, after being pressurized by the circulating water pump, cooling water enters the radiator from the water inlet of the radiator, is subjected to heat exchange by the radiator, flows out from the water outlet of the radiator, sequentially flows through the power battery, the motor controller and the power motor, and finally returns to the water inlet of the circulating water pump, so that a cooling cycle is completed. The power battery and the motor controller are electrically connected to the water cooling controller, and when the water cooling controller detects that the power battery and the motor controller need to be cooled due to temperature rise, the water cooling controller controls the circulating water pump to be started, the first fan and the second fan to be started, and the temperature of the power battery and the temperature of the motor controller are reduced. And the water-cooling controller can also adjust the rotating speeds of the circulating water pump, the first fan and the second fan, so that the temperature is reduced and the energy consumption is reduced.

The cooling method provided by the invention comprises four steps which respectively correspond to four working modes, namely a mode one: the first fan, the second fan and the circulating water pump are closed and do not work; and a second mode: the first fan and the second fan do not work, and the circulating water pump works; and a third mode: the second fan does not work, and the first fan and the circulating water pump work; and a fourth mode: the first fan, the second fan and the circulating water pump all work. When the vehicle starts, the water-cooling controller controls the circulating water pump, the first fan and the second fan to work in corresponding modes according to the collected temperatures.

Drawings

FIG. 1 is a schematic diagram of a cooling system according to an embodiment of the present invention.

In the figure:

1. a heat sink;

2. a first fan;

3. a second fan;

4. a water circulating pump;

5. a water-cooling controller;

6. a power battery;

7. a motor controller;

8. a power motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, a first feature being "on," "over," and "above" a second feature includes the first feature being directly on and obliquely above the second feature, or simply meaning that the first feature is higher in level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the embodiments of the present invention, the terms "upper", "lower", "right", and the like are used in an orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

At present, a cooling system of an automobile includes a radiator, a plurality of cooling fans, and a plurality of circulating water pumps, and a motor, a motor controller, and a battery are connected in series with the cooling system to be cooled. However, the cooling system corresponds to a plurality of cooling fans and a plurality of water circulation pumps, and is configured with a plurality of cooling fan controllers and a plurality of water pump controllers, so as to control the cooling fans and the water circulation pumps respectively, and the cooling system has low integration level, high cost, and is not favorable for arrangement and assembly. And radiator fan and circulating water pump work independently, and the overall coordination is poor, and the energy consumption is high.

In order to provide the integration level of the cooling system and reduce the cost, the embodiment provides a cooling system, as shown in fig. 1, which includes a radiator 1, a first fan 2, a second fan 3, a circulating water pump 4 and a water cooling controller 5, wherein the first fan 2 and the second fan 3 are both arranged on the radiator 1, the circulating water pump 4, the radiator 1, a power battery 6, a motor controller 7 and a power motor 8 are sequentially connected in series, the circulating water pump 4 is connected to a water inlet of the radiator 1, and the power battery 6 is connected to a water outlet of the radiator 1, so as to form a cooling cycle. The first fan 2, the second fan 3, the circulating water pump 4, the power battery 6 and the motor controller 7 are electrically connected to the water-cooling controller 5, so that the control of the water-cooling controller 5 on the cooling system is facilitated.

In the cooling system provided by this embodiment, after being pressurized by the circulating water pump 4, the cooling water enters the radiator 1 from the water inlet of the radiator 1, and after being subjected to heat exchange by the radiator 1, the cooling water flows out from the water outlet of the radiator 1, sequentially flows through the power battery 6, the motor controller 7 and the power motor 8, and finally returns to the water inlet of the circulating water pump 4, so as to complete a cooling cycle. The power battery 6 and the motor controller 7 are electrically connected to the water cooling controller 5, and when the water cooling controller 5 detects that the temperature of the power battery 6 and the motor controller 7 rises and needs to be cooled, the water cooling controller 5 controls the circulating water pump 4 to be started, the first fan 2 and the second fan 3 to be started, and the temperature of the power battery 6 and the temperature of the motor controller 7 are reduced. Furthermore, the water cooling controller 5 can adjust the rotation speed of the circulating water pump 4, the first fan 2 and the second fan 3, and reduce the temperature and the energy consumption.

Specifically, the water-cooling controller 5 comprises a signal acquisition module, and the power battery 6 and the motor controller 7 are electrically connected to the signal acquisition module of the water-cooling controller 5, so that the real-time temperature of the power battery 6 and the real-time temperature of the motor controller 7 can be conveniently collected.

Specifically, the water-cooling controller 5 is provided with a plurality of output pins, and the circulating water pump 4, the first fan 2 and the second fan 3 are connected to the output pins in a one-to-one correspondence manner. Be provided with first output pin, second output pin and third output pin on water-cooling controller 5, correspond circulating water pump 4 and connect first output pin, first fan 2 corresponds and connects second output pin, and second fan 3 corresponds and connects third output pin, and the start-stop and the rotational speed of circulating water pump 4, first fan 2 and second fan 3 are controlled to water-cooling controller 5 of being convenient for.

More specifically, the motor of the first fan 2 and the motor of the second fan 3 both adopt PWM-controlled high-speed brushless motors, the motor control line of the first fan 2 is correspondingly connected to the second output pin, and the motor control line of the second fan 3 is correspondingly connected to the third output pin, so that the water-cooling controller 5 controls the first fan 2 and the second fan 3. The circulating water pump 4 adopts a high-lift PWM (pulse-width modulation) control high-speed water pump, and a control line of the circulating water pump 4 is correspondingly connected with a first output pin for connection, so that the control of the water-cooling controller 5 on the circulating water pump 4 is realized.

Specifically, in the present embodiment, the number of the radiators 1, the circulating water pump 4 and the water cooling controller 5 is one, and compared with the existing cooling system, the present embodiment provides fewer cooling system components, and is convenient for integrated installation.

The embodiment also provides a cooling method, and the cooling system is used, so that the energy consumption of the automobile is reduced. The water cooling controller 5 is provided with a first temperature preset value, a second temperature preset value, and a third temperature preset value, wherein Ts1 represents the first temperature preset value, Ts2 represents the second temperature preset value, Ts3 represents the third temperature preset value, and Ts1< Ts2< Ts 3. Tg represents the temperature of the power battery 6, and Tf represents the temperature of the motor controller 7.

The cooling method using the cooling system comprises the following steps:

s1, after the power supply is powered on for a certain time, the water-cooling controller 5 acquires the temperature of the power battery 6 and the temperature of the motor controller 7 through the signal acquisition module, if the temperature of the power battery 6 and the temperature of the motor controller 7 are both lower than a first temperature set value, namely Kf is less than Ts1 and Tf is less than Ts1, the water-cooling controller 5 controls the PWM duty ratios output by the first output pin, the second output pin and the third output pin to be 0, and therefore the first fan 2, the second fan 3 and the circulating water pump 4 are all turned off;

s2, the water-cooling controller 5 continuously collects the temperature of the power battery 6 and the temperature of the motor controller 7, if the temperature of the power battery 6 or the temperature of the motor controller 7 is greater than a first temperature set value, namely Tg is greater than Ts1 or Tf is greater than Ts1, it is indicated that the power motor 8, the motor controller 7 or the power battery 6 generate a large amount of heat and a cooling system needs to intervene in work in advance, the water-cooling controller 5 controls to start the circulating water pump 4 to cool the motor controller 7, the power motor 8 or the power battery 6 in advance, and the phenomenon that the cooling system is overloaded and consumes too much energy in a short time after the temperature is accumulated and increased is prevented. After a certain time, the water-cooling controller 5 judges again, if the temperature of the power battery 6 and the temperature of the motor controller 7 are both lower than the first temperature set value, namely Tg is less than Ts1 and Tf is less than Ts1, the water-cooling controller 5 controls the PWM duty ratio output by the first output pin to be 0, and the circulating water pump 4 is closed; if the temperature of the power battery 6 or the temperature of the motor controller 7 is still greater than the first temperature set value, namely Tg is greater than Ts1 or Tf is greater than Ts1, the state is maintained, the circulating water pump 4 is continuously started, and the motor controller 7, the power motor 8 or the power battery 6 are cooled;

S3, if the temperature of the power battery 6 or the temperature of the motor controller 7 is greater than a second temperature set value, namely Tg is greater than Ts2 or Tf is greater than Ts2, it is indicated that the cooling system can not meet the heat dissipation requirement of the power system only by starting the circulating water pump 4 to reduce the temperature, and the water cooling controller 5 controls to start the first fan 2 to enable the circulating water pump 4 and the first fan 2 to work together, so that the heat exchange amount of the radiator 1 is increased, and the water temperature is reduced as soon as possible. After a certain time, judging again, if the temperature of the power battery 6 and the temperature of the motor controller 7 are both lower than a second temperature set value, namely Tg < Ts2 and Tf < Ts2, the water-cooling controller 5 controls the PWM duty ratio output by a second output pin to be 0 through signals, turning off the first fan 2, and only turning on the circulating water pump 4 to work, if the temperature of the power battery 6 or the temperature of the motor controller 7 is still higher than the second temperature set value, namely Kf > Ts2 or Tf > Ts2, maintaining the state, and enabling the circulating water pump 5 and the first fan 2 to work together to cool the motor controller 7, the power motor 8 or the power battery 6;

s4, if the temperature of the power battery 6 or the temperature of the motor controller 7 is greater than a third temperature set value, namely Tg is greater than Ts3 or Tf is greater than Ts3, it is indicated that the cooling system only starts the circulating water pump 4 and the first fan 2 to cool down together, and the heat dissipation requirement of the power system cannot be met, the water-cooling controller 5 controls to start the second fan 3, so that the circulating water pump 4, the first fan 2 and the second fan 3 work together, the heat exchange amount of the radiator 1 is continuously increased, and the water temperature is reduced as soon as possible. After a certain time, judging again, if the temperature of the power battery 6 and the temperature of the motor controller 7 are both lower than a third temperature set value, namely Tg < Ts3 and Tf < Ts3, the water-cooling controller 5 controls the PWM duty ratio output by the third output pin to be 0 through signals, the second fan 3 is turned off, and if the temperature of the power battery 6 or the temperature of the motor controller 7 is greater than the third temperature set value, namely Tg > Ts3 or Tf > Ts3, the state is maintained, and the circulating water pump 5, the first fan 2 and the second fan 3 work together to cool the motor controller 7, the power motor 8 or the power battery 6.

The cooling method provided by the embodiment includes four steps, which respectively correspond to four working modes, namely a mode one: the first fan 2, the second fan 3 and the circulating water pump 4 are all closed and do not work; and a second mode: the first fan 2 and the second fan 3 do not work, and the circulating water pump 4 works; and a third mode: the second fan 3 does not work, and the first fan 2 and the circulating water pump 4 work; and a fourth mode: the first fan 2, the second fan 3 and the circulating water pump 4 are all operated. When the vehicle is started, the water cooling controller 5 controls the circulating water pump 4 and the first fan 2 and the second fan 3 to work in corresponding modes according to the collected temperatures.

Further, the water cooling controller 5 calculates the temperature rise rate of the power battery 6 and the temperature rise rate of the motor controller 7 according to the temperature of the power battery 6 and the temperature of the motor controller 7 acquired by the signal acquisition module, wherein Kg represents the temperature rise rate of the power battery 6, and Kf represents the temperature rise rate of the motor controller 7. The water cooling controller 5 is provided with a first temperature-rise rate comparison value, a second temperature-rise rate comparison value, and a third temperature-rise rate comparison value, wherein Ks1 represents the first temperature-rise rate comparison value, Ks2 represents the second temperature-rise rate comparison value, Ks3 represents the third temperature-rise rate comparison value, and Ks1< Ks2< Ks 3.

Specifically, in step S1, if the temperature rise rate of the power battery 6 or the temperature rise rate of the motor controller 7 is greater than the first temperature rise rate comparison value, i.e., Kg > Ks1 or Kf > Ks1, it indicates that the power motor 8, the motor controller 7 or the power battery 6 generates a large amount of heat, and the cooling system needs to be involved in work in advance, and the step S2 is entered, and the water-cooling controller 5 controls to turn on the circulating water pump 4. More specifically, the PWM duty ratio output from the first output pin of the water-cooling controller 5 is calculated according to the formula Kf × (Tf-Ts1) or Kg × (Tg-Ts1), thereby adjusting the rotation speed of the circulation water pump 4.

Specifically, in step S2, if the temperature rise rate of the power battery 6 or the temperature rise rate of the motor controller 7 is greater than the second temperature rise rate comparison value, i.e., Kg > Ks2 or Kf > Ks2, it indicates that the cooling system cannot meet the heat dissipation requirement of the power system by only turning on the circulating water pump 4, and the process proceeds to step S3, where the water-cooling controller 5 controls to turn on the first fan 2, so that the circulating water pump 4 and the first fan 2 work together to increase the heat exchange amount of the radiator 1 and reduce the water temperature as soon as possible. More specifically, the PWM duty ratio output from the second output pin of the water-cooling controller 5 is calculated according to the formula Kf × (Tf-Ts2) or Kg × (Tg-Ts2) to adjust the rotation speed of the first fan 2.

Specifically, in step S3, if the temperature rise rate of the power battery 6 or the temperature rise rate of the motor controller 7 is greater than the third temperature rise rate comparison value, i.e., Kg > Ks3 or Kf > Ks3, it indicates that the cooling system is only started and the circulating water pump 4 and the first fan 2 are together cooled, and the heat dissipation requirement of the power system cannot be met, the process proceeds to step S4, and the water-cooling controller 5 controls to start the second fan 3. More specifically, the PWM duty ratio output from the third output pin of the water-cooling controller 5 is calculated according to the formula Kf × (Tf-Ts3) or Kg × (Tg-Ts3) to adjust the rotation speed of the second fan 3.

Note that, in step S2, the rotational speed of the circulation water pump 4 has been adjusted by calculation according to the formula Kf × (Tf-Ts1) or Kg × (Tg-Ts1), so in step S3, the circulation water pump 4 has been operated at the highest rotational speed, and it is no longer necessary to adjust the rotational speed of the circulation water pump 4. Similarly, in step S4, the first fan 2 is already operating at the highest rotation speed, and the rotation speed of the first fan 2 no longer needs to be adjusted. In steps S3 and S4, the steps of adjusting the rotation speed of the circulating water pump 4 and the rotation speed of the first fan 2 are reduced, providing the working efficiency.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.