CN114649996A - Motor temperature control method and device and automobile - Google Patents

Motor temperature control method and device and automobile Download PDF

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Publication number
CN114649996A
CN114649996A CN202011524420.1A CN202011524420A CN114649996A CN 114649996 A CN114649996 A CN 114649996A CN 202011524420 A CN202011524420 A CN 202011524420A CN 114649996 A CN114649996 A CN 114649996A
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China
Prior art keywords
temperature
motor
preset
water pump
circulating water
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CN202011524420.1A
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Chinese (zh)
Inventor
孙文举
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Beiqi Foton Motor Co Ltd
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Beiqi Foton Motor Co Ltd
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Priority to CN202011524420.1A priority Critical patent/CN114649996A/en
Publication of CN114649996A publication Critical patent/CN114649996A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors

Abstract

The embodiment of the application relates to a motor temperature control method and device and an automobile, and aims to effectively control the motor temperature and reduce energy loss. The method comprises the following steps: detecting a temperature of the motor and a rate of change of the temperature; determining a cooling mode according to a temperature of the motor and a rate of change of the temperature; determining the required rotating speed of a circulating water pump and the required rotating speed of a cooling fan according to the temperature of the motor, the change rate of the temperature and the cooling mode; and controlling the circulating water pump to operate at the required rotating speed of the circulating water pump, and controlling the cooling fan to operate at the required rotating speed of the cooling fan.

Description

Motor temperature control method and device and automobile
Technical Field
The embodiment of the application relates to the technical field of motor control, in particular to a motor temperature control method and device and an automobile.
Background
The motor provides power for the car in pure electric vehicles or hybrid vehicle, if the heat that the motor operation in-process produced can not even distribute, can lead to motor temperature sharply to rise, reduce driving motor's performance and life, can influence electronic component's in the machine controller life simultaneously, burn out the component even, consequently, effectual control motor temperature has very important influence to electric automobile whole car security and reliability of operation with guaranteeing motor and controller normal work. The existing way to control the temperature of the motor is to add a combined fan to the heat dissipation system, and to turn on one or more fans when the temperature of the motor reaches a threshold.
The problem in the prior art is that when the temperature sensor collects that the temperature of the motor reaches an alarm threshold value, the high-speed fan in the combined fan is started, the temperature of the motor cannot be reduced in time, and an over-temperature fault can be generated under severe conditions to influence the driving of a vehicle. Another problem is that the fan is also operated frequently when the temperature of the motor is low, which causes the energy waste of the whole vehicle.
Disclosure of Invention
The embodiment of the application provides a motor temperature control method and device and an automobile, and aims to effectively control the motor temperature and reduce energy loss.
A first aspect of an embodiment of the present application provides a method for controlling a temperature of a motor, where the method includes:
detecting a temperature of the motor and a rate of change of the temperature;
determining a cooling mode according to a temperature of the motor and a rate of change of the temperature;
determining the required rotating speed of a circulating water pump and the required rotating speed of a cooling fan according to the temperature of the motor, the change rate of the temperature and the cooling mode;
and controlling the circulating water pump to operate at the required rotating speed of the circulating water pump, and controlling the cooling fan to operate at the required rotating speed of the cooling fan.
Optionally, detecting the temperature of the motor and the rate of change of the temperature comprises:
receiving a temperature signal of the motor acquired by a temperature sensor;
and determining the temperature of the motor and the change rate of the temperature according to the temperature signal of the motor.
Optionally, determining a cooling mode based on the temperature of the electric machine and the rate of change of the temperature comprises:
when the temperature of the motor is between a first preset temperature and a second preset temperature, the cooling mode is a threshold value control mode;
when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is less than 1, the cooling mode is a threshold value control mode;
when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is greater than 1, the cooling mode is a fuzzy control mode;
when the temperature of the motor is between a third preset temperature and a fourth preset temperature, the cooling mode is a fuzzy control mode;
and the temperatures of the first preset temperature and the fourth preset temperature are sequentially increased.
Optionally, when the cooling mode is the threshold control mode, determining a required rotation speed of the water circulation pump and a required rotation speed of the cooling fan according to the temperature of the motor and the rate of change in the temperature includes:
when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is less than 1, the circulating water pump and the heat dissipation fan are turned off;
when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is greater than 1, the required rotating speed of the circulating water pump is a first preset speed, and the cooling fan is turned off;
when the motor temperature is between the second preset temperature and the third preset temperature and the change rate of the temperature is less than 1, the required rotating speed of the circulating water pump is the second preset speed, the required rotating speed of the cooling fan is the third preset speed, and the second preset speed is greater than the first preset speed.
Optionally, when the cooling mode is the fuzzy control mode, determining the required rotation speed of the circulating water pump and the required rotation speed of the cooling fan according to the temperature of the motor and the rate of change of the temperature includes:
and when the temperature control mode is the fuzzy control mode, adaptively adjusting the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the motor temperature and the change rate of the temperature.
Optionally, the method further comprises:
and when the temperature of the motor is lower than the first preset temperature, the circulating water pump and the heat dissipation fan are closed.
Optionally, the method further comprises:
when the temperature of the motor is higher than the fourth preset temperature, performing motor over-temperature alarm;
controlling the circulating water pump and the heat dissipation fan to operate at the maximum power, and/or reducing the operating power of the motor;
and if the over-temperature alarm time exceeds the preset maximum alarm time, controlling the motor to stop running.
A second aspect of the embodiments of the present application provides a motor temperature control apparatus, including:
the temperature detection module is used for detecting the temperature of the motor and the change rate of the temperature;
a cooling mode determination module for determining a cooling mode based on a temperature of the electric machine and a rate of change of the temperature;
the required rotating speed determining module is used for determining the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the temperature of the motor, the change rate of the temperature and the cooling mode;
and the rotating speed control module is used for controlling the circulating water pump to operate at the required rotating speed of the circulating water pump and controlling the cooling fan to operate at the required rotating speed of the cooling fan.
Optionally, the temperature detection module includes:
the temperature signal receiving submodule is used for receiving the temperature signal of the motor, which is acquired by the temperature sensor;
and the temperature determining submodule is used for determining the temperature of the motor and the change rate of the temperature according to the temperature signal of the motor.
Optionally, the cooling mode determination sub-module includes:
the first mode determination submodule is used for determining that the cooling mode is a threshold value control mode when the temperature of the motor is between a first preset temperature and a second preset temperature;
the second mode determination submodule is used for determining that the cooling mode is a threshold value control mode when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is less than 1;
a third mode determination submodule, configured to determine that the cooling mode is a fuzzy control mode when the temperature of the motor is between a second preset temperature and a third preset temperature and a change rate of the temperature is greater than 1;
a fourth mode determination submodule configured to determine that the cooling mode is the fuzzy control mode when the temperature of the motor is between a third preset temperature and a fourth preset temperature;
and the temperatures of the first preset temperature and the fourth preset temperature are sequentially increased.
Optionally, the required rotation speed determination module includes:
a threshold control mode rotation speed determination submodule configured to determine a required rotation speed of the circulation water pump and a required rotation speed of the radiator fan according to the motor temperature and the rate of change in the temperature when the cooling mode is the threshold control mode, and including:
a first rotation speed determination submodule for turning off the circulating water pump and the heat dissipation fan when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is less than 1;
a second rotation speed determination submodule, configured to, when the temperature of the motor is between the first preset temperature and the second preset temperature and a change rate of the temperature is greater than 1, turn off the heat dissipation fan when a required rotation speed of the circulation water pump is a first preset speed;
and a third rotating speed determining submodule, configured to set the required rotating speed of the circulating water pump to a second preset speed and set the required rotating speed of the heat dissipation fan to a third preset speed when the motor temperature is between the second preset temperature and the third preset temperature and the change rate of the temperature is less than 1, where the second preset speed is greater than the first preset speed.
A fuzzy control mode rotation speed determination submodule for determining a required rotation speed of the circulation water pump and a required rotation speed of the radiator fan according to the motor temperature and the rate of change in the temperature when the cooling mode is the fuzzy control mode, comprising:
and the fourth rotating speed determining submodule is used for adaptively adjusting the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the temperature of the motor and the change rate of the temperature when the temperature control mode is the fuzzy control mode.
Optionally, the cooling mode determination sub-module further comprises:
and the cooling system closing submodule is used for closing the circulating water pump and the cooling fan when the temperature of the motor is lower than the first preset temperature.
Optionally, the cooling mode determination module further comprises:
the over-temperature alarm sub-module is used for carrying out over-temperature alarm on the motor when the temperature of the motor is higher than the fourth preset temperature;
the power control submodule is used for controlling the circulating water pump and the cooling fan to operate at the maximum power and/or reducing the operating power of the motor;
and the overtime stop submodule is used for controlling the motor to stop running if the overtemperature alarm time exceeds the preset maximum alarm time.
A third aspect of embodiments of the present application provides an automobile, including: a control unit; the control unit is adapted to implement the steps in the method according to the first aspect of the application.
According to the motor temperature control method, the current temperature and the temperature change rate of the motor are detected, the current cooling mode is determined according to the current temperature and the temperature change rate of the motor, the required rotating speeds of a circulating water pump and a cooling fan in a cooling system are determined according to the current temperature and the temperature change rate of the motor and the current cooling mode, and the circulating water pump and the cooling fan are controlled to operate at the required rotating speeds. According to the current temperature and the temperature change rate of the motor and the current cooling mode, the rotating speeds of the circulating water pump and the cooling fan are controlled by adopting different powers at different temperatures, the energy consumption of the whole vehicle is reduced, and the temperature of the motor is effectively controlled. When the temperature of the motor is low, the power of the cooling system is low, the emitted noise is low, and the NVH (noise, vibration and harshness) performance of the whole vehicle is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a motor control method according to an embodiment of the present application;
FIG. 2 is a logic diagram for controlling motor temperature according to an embodiment of the present application;
fig. 3 is a schematic diagram of a motor control apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The motor generates heat when running, the automobile distributes the heat generated by the motor through the cooling system, the cooling system generally comprises a circulating water pump, a radiator and a cooling fan, the circulating water pump is used for driving cooling liquid to circularly flow in a cooling pipeline to take away the heat in the motor, when the cooling liquid passes through the radiator, the radiator discharges the heat in the cooling liquid to the outside through the cooling fan, the effect of reducing the temperature of the motor and a motor controller is achieved, the motor controller is installed on the motor, the temperature of the motor controller can rise along with the rise when the temperature of the motor rises, and if the heat dissipation is not timely, the motor and the motor controller can be damaged. As shown in fig. 1, the method comprises the steps of:
and S11, detecting the temperature of the motor and the change rate of the temperature.
The specific steps of detecting the temperature and the temperature change rate of the motor comprise:
s11-1: and receiving the temperature signal of the motor acquired by the temperature sensor.
In this embodiment, the temperature signals of the motor and the motor controller are collected by the motor temperature sensor mounted thereon, and the control unit further processes the motor temperature signal after receiving the temperature signal collected by the motor temperature sensor. The control unit is used for controlling the individual electronic components of the motor vehicle.
In this embodiment, the selection of the motor temperature sensor is not particularly required, and the temperature sensors conforming to the motor specification may be used for detecting the motor temperature, such as a thermistor sensor, a PTC temperature sensor, and a PT100 temperature sensor.
S11-2: and determining the temperature of the motor and the change rate of the temperature according to the temperature signal of the motor.
In this embodiment, after receiving the temperature signal collected by the motor sensor, the control unit performs digital filtering on the temperature signal, converts the analog signal into a digital signal, and obtains an accurate temperature value of the motor.
Calculating the ratio of the motor temperature value at the current moment to the motor temperature value at the previous moment, wherein the obtained result is the temperature change rate, the temperature change rate reflects the change trend of the current temperature, if the motor temperature change rate is greater than 1, the motor temperature at the current moment is greater than the motor temperature at the previous moment, namely the motor temperature has a rising trend, and if the motor temperature change rate is less than 1, the motor temperature at the current moment is less than the motor temperature at the previous moment, namely the motor temperature has a falling trend.
And S12, determining a cooling mode according to the temperature of the motor and the change rate of the temperature.
In this embodiment, the temperature of the motor and the temperature of the motor controller may be increased by heat generated by the motor, the cooling system may be started or shut down according to the temperature detected by the motor, the cooling mode is a control mode of the cooling system, the control mode of the cooling system is determined by the temperature of the motor and the change rate of the temperature, and the control mode suitable for the current motor condition is determined by combining the current temperature change rate at different temperatures.
In the present embodiment, the control modes of the cooling system are divided into a threshold control mode and a fuzzy control mode. And under the condition of low temperature, a threshold value control mode is used for controlling a circulating water pump and a cooling fan in the cooling system, and the rotating speeds of the circulating water pump and the cooling fan in the cooling system under the conditions of a certain temperature interval and a temperature change rate are preset rotating speeds and are fixed values. After the temperature rises to a certain range, a fuzzy control mode is used for controlling a circulating water pump and a cooling fan in a cooling system, a control unit can adjust the rotating speed of the circulating water pump and the rotating speed of the cooling fan according to the currently detected temperature, and the rotating speeds of the circulating water pump and the cooling fan are continuously changed aiming at different temperatures.
The specific steps of determining the cooling mode according to the temperature and the rate of change of the temperature of the motor include:
s12-1: and when the temperature of the motor is between a first preset temperature and a second preset temperature, the cooling mode is a threshold value control mode.
In this embodiment, the first preset temperature is slightly lower than the second preset temperature, when the temperature of the motor reaches the second preset temperature, the control unit controls the cooling system to be started, the threshold control mode is a control mode in which a start threshold is set for the cooling system, when the temperature of the motor reaches a start threshold, the cooling system is started, and after the cooling system is started, the control unit controls the cooling system to operate under a preset condition according to the current temperature range.
In this embodiment, the start threshold of the cooling system is a second preset temperature, the first preset temperature is slightly lower than the second preset temperature, in the actual detection, the sensor slightly delays when detecting the motor temperature, and when the motor temperature collected by the sensor is the first preset temperature, the actual motor temperature has already reached the start threshold of the cooling system, that is, the second preset temperature.
For example, the first preset temperature is 65 ℃, the second preset temperature is 70 ℃, because the error between the motor temperature monitored by the temperature sensor and the actual motor temperature is about 5 ℃, when the temperature sensor detects that the motor temperature is 65 ℃, the control unit starts to control the cooling system to operate in the threshold control mode, and the circulating water pump and the cooling fan are operated at the respective set required speeds within a certain temperature interval.
S12-2: and when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is less than 1, the cooling mode is a threshold value control mode.
In this embodiment, the second preset temperature is lower than the third preset temperature, and a temperature change rate of less than 1 represents that the current temperature of the motor has a trend of decreasing.
Illustratively, the third preset temperature is set to 80 ℃, and when the motor temperature is detected to be between 70 ℃ and 80 ℃ and the temperature change rate is less than 1, the control unit controls the operation of the cooling system in the threshold control mode.
S12-3: and when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is greater than 1, the cooling mode is a fuzzy control mode.
In the present embodiment, the fuzzy control mode is a mode for performing control using a fuzzy mathematical concept and a basic theory. The fuzzy control mode is suitable for controlling a nonlinear object, and the change of the temperature of the motor is nonlinear, so that the fuzzy control mode is used for controlling the rotating speeds of a circulating water pump and a radiating fan in the cooling system, and the temperature of the motor and a motor controller can be kept within a specified range. A rate of change of temperature greater than 1 indicates that the current temperature has a tendency to rise.
In this embodiment, when the temperature of the motor is between the second preset temperature and the third preset temperature and the temperature change rate is greater than 1, the temperature will continue to rise, and then exceed the third preset temperature, and after exceeding the third preset temperature, the threshold control mode will not have an obvious effect on controlling the temperature of the motor any more, and at this moment, the operation of the cooling system is controlled by switching to the threshold mode, so that the temperature of the motor can be effectively controlled.
Illustratively, the control unit assumes a fuzzy control mode for the cooling system when it is detected that the motor temperature is between 70 ℃ and 80 ℃ and the rate of temperature change is greater than 1.
S12-4: when the temperature of the motor is between a third preset temperature and a fourth preset temperature, the cooling mode is a fuzzy control mode; and the temperatures of the first preset temperature and the fourth preset temperature are sequentially increased.
In this embodiment, the third preset temperature is lower than the fourth preset temperature, which is also called an alarm temperature, and when the motor temperature is detected to be higher than the fourth preset temperature, the control unit may perform an over-temperature alarm.
In this embodiment, the target temperature value set in the fuzzy control mode is a third preset temperature value, after the fuzzy control mode is started, the temperature of the motor starts to decrease, and when it is detected that the temperature decreases below the third preset temperature and the temperature change rate is less than 1, that is, the temperature of the motor is still decreasing, the fuzzy control mode is switched to the threshold control mode.
For example, the fourth preset temperature is 145 ℃, because if the motor is higher than 145 ℃ for a long time, the motor and the motor controller may be damaged greatly, and even the components may be burned. When the temperature of the motor is detected to be between 80 ℃ and 145 ℃, the control unit controls the cooling system to operate in a fuzzy control mode, and switches to a threshold control mode to operate until the temperature of the motor is reduced to be below 80 ℃ and the temperature change rate is smaller than 1.
And S13, determining the required rotating speed of the circulating water pump and the required rotating speed of the heat dissipation fan according to the temperature of the motor, the change rate of the temperature and the cooling mode.
In this embodiment, the required rotation speed is the rotation speed of the circulating water pump and the cooling fan required to achieve the purpose of controlling the temperature of the motor, after the cooling mode of the cooling system is determined, the required rotation speed of the circulating water pump and the required rotation speed of the cooling fan in the cooling system are obtained by combining the temperature of the motor and the change rate of the temperature, the faster the rotation speed of the circulating water pump is, the faster the flow speed of the cooling liquid in the cooling pipeline is, the better the heat dissipation effect is, and the determination methods for the required rotation speed of the circulating water pump and the required rotation speed of the cooling fan are different in the threshold control mode and the fuzzy control mode.
In this embodiment, when the cooling mode is the threshold control mode, the method for determining the required rotation speed of the water circulation pump and the required rotation speed of the cooling fan according to the temperature of the motor, the change rate of the temperature, and the cooling mode includes:
s131-1: and when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is less than 1, closing the circulating water pump and the heat dissipation fan.
In this embodiment, when it is detected that the temperature of the motor is between the first preset temperature and the second preset temperature, the actual temperature of the motor may have reached the second preset temperature, and at this time, the control unit starts to control the circulating water pump and the cooling fan in the cooling system in the threshold control mode.
In this embodiment, the detected temperature of the motor is between the first preset temperature and the second preset temperature, and the change rate of the temperature is less than 1, which represents that the current temperature has a trend of decreasing, and is in a low temperature state at this time. The motor and the motor controller cannot be damaged, the temperature of the motor can be waited to automatically fall, and the circulating water pump and the cooling fan do not need to be started, so that the circulating water pump and the cooling fan are closed, and the energy consumption is reduced.
The motor is a permanent magnet synchronous motor, the temperature of the motor is detected to be between 65 ℃ and 70 ℃, the temperature change rate is smaller than 1, the temperature of the motor can be reduced to be lower than 65 ℃ within a period of time according to the trend, at the moment, the demagnetization of the permanent magnet in the motor is slightly influenced by the heat generated by the motor, the insulating material cannot be influenced, the cooling system can be closed, and the rotating speed of a circulating water pump and a cooling fan in the cooling system is zero.
S131-2: and when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is greater than 1, the required rotating speed of the circulating water pump is a first preset speed, and the heat radiation fan is turned off.
In this embodiment, when the temperature of the motor is detected to be between the first preset temperature and the second preset temperature, and the change rate of the temperature is greater than 1, the temperature of the motor is in a rising state, and the actual temperature of the motor may already exceed the first preset temperature, at which time the cooling system needs to be started. The first preset speed is the preset speed of the circulating water pump in a low-temperature state, the speed value is low, the circulating water pump drives the cooling liquid to flow in the cooling pipe at the first preset speed, and the temperature of the motor can be effectively reduced. At this time, the required rotation speed of the cooling fan is zero because the temperature of the motor is low.
In an example, the detected temperature of the motor is between 65 ℃ and 70 ℃, the temperature change rate is greater than 1, the actual temperature rises to more than 70 ℃ according to the trend, and damage is caused to the motor and a motor controller, at the moment, the control unit controls the circulating water pump and the cooling fan of the cooling system in a threshold value control mode, the required rotating speed of the circulating water pump is a first preset speed according to the preset condition defect, the speed can be automatically set according to the power condition of the actual fan, and the first preset speed is a fixed value and is the rotating speed when the fan runs at a lower power.
S131-3: when the motor temperature is between the second preset temperature and the third preset temperature and the change rate of the temperature is less than 1, the required rotating speed of the circulating water pump is the second preset speed, the required rotating speed of the cooling fan is the third preset speed, and the second preset speed is greater than the first preset speed.
In this embodiment, when it is detected that the motor is located between the second preset temperature and the third preset temperature, and the temperature change rate is less than 1, the temperature of the motor is slightly higher, and the temperature tends to decrease, at this time, the control unit controls the cooling system to operate in the threshold control mode, according to the temperature and the control mode, the control unit determines that the required rotation speed of the circulating water pump is the second preset speed, and the second preset speed is greater than the first preset speed and is the intermediate rotation speed of the circulating water pump. The third predetermined speed is a lower speed.
In this embodiment, the temperature at this time is slightly higher, and the motor controller are damaged to a certain extent if the temperature is at this temperature for a long time, and although the overall temperature is in a descending trend, in order to accelerate the temperature reduction, the speed of the water circulating pump is increased, so that the water circulating pump operates at a median speed higher than the first preset speed, and the heat radiation fan operates at the third preset speed to accelerate the heat radiation.
Illustratively, it is detected that the temperature of the motor is between 70 ℃ and 80 ℃, and the temperature change rate is less than 1, at this time, the control unit determines that the rotation speed of the circulation water pump is a second preset rotation speed, and the rotation speed of the cooling fan is a third preset rotation speed, wherein the second preset rotation speed can select to operate the circulation water pump at a medium power according to the actual power condition of the circulation water pump, and the third preset speed can select to operate the cooling fan at a low power according to the actual power condition of the cooling fan.
In this embodiment, in the threshold control mode, the control unit controls the circulating water pump in the cooling system to operate at a low speed when the temperature of the motor is low, the output torque of the circulating water pump at the rotating speed is large, the power is low, the noise is low, the NVH characteristic is good, and the fan is turned off at the moment, so that the energy consumption is reduced. When the temperature continues to rise, the rotating speed of the water pump is switched to the medium speed to operate, the flow of the cooling liquid is increased along with the medium speed, and the heat dissipation capacity is increased.
In this embodiment, when the cooling mode is the fuzzy control mode, determining the required rotation speed of the circulation water pump and the required rotation speed of the cooling fan according to the temperature of the motor and the rate of change in the temperature includes:
s132-1: and when the temperature control mode is the fuzzy control mode, adaptively adjusting the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the motor temperature and the change rate of the temperature.
In this embodiment, the motor temperature is in a high state, and if the temperature is not reduced in time, the motor and the motor controller are damaged. The change of the motor temperature has larger nonlinearity, and the fuzzy control mode is suitable for controlling nonlinear objects, so that the circulating water pump and the cooling fan in the cooling system are controlled by adopting the fuzzy control mode.
In this embodiment, in the fuzzy control process, the required rotation speed of the circulating water pump and the required rotation speed of the cooling fan are changed in real time according to the detected motor temperature and the change rate of the motor temperature, and when the detected motor temperature is high and the temperature rises faster, the control unit increases the operating power of the circulating water pump and the cooling fan, so that the cooling liquid in the circulating water pump operates in an accelerated manner, the rotation speed of the fan is increased, and the heat dissipation capacity is increased. When the motor temperature is detected to be close to the target temperature, the control unit can reduce the running power of the circulating water pump and the cooling fan, and the energy loss is reduced as much as possible while the cooling purpose is achieved.
For example, when the motor temperature is detected to be between 80 ℃ and 145 ℃, the cooling system is in the fuzzy control mode, and when the motor temperature is detected to be 130 ℃ and the change rate of the temperature is greater than 1, the temperature of the motor is too high and needs to be rapidly reduced, so that the control unit determines that the required rotation speeds of the circulating water pump and the heat dissipation fan are large. When the temperature of the motor is detected to be 90 ℃ and the change rate of the temperature is less than 1, the temperature of the motor is lower than before and has a tendency of reducing, and at the moment, the control unit determines that the required rotating speeds of the circulating water pump and the heat dissipation fan are reduced by a little compared with before, so that the energy loss is reduced.
In this embodiment, when the motor temperature is less than the first preset temperature, the circulation water pump and the cooling fan are turned off.
In this embodiment, when the motor temperature is less than the first preset temperature, the motor is at a very low temperature, the influence on the inside of the motor and the elements in the motor controller can be ignored, the cooling system can be turned off at this time, the circulating water pump and the cooling fan do not operate, and the electric energy is saved.
In the embodiment of the present application, when it is detected that the temperature of the motor is greater than the preset fourth temperature, the executed steps include:
s133-1: and when the temperature of the motor is higher than the fourth preset temperature, performing motor over-temperature alarm.
In this embodiment, the fourth preset temperature is an alarm temperature, when the temperature of the motor is detected to be higher than the fourth preset temperature, the motor is in a high-temperature state, and when the motor is in the high-temperature state for a long time, the motor and elements in the motor controller are greatly damaged, and at this time, after the control unit receives a signal collected by the temperature sensor, the over-temperature alarm is performed.
Illustratively, the fourth preset temperature is set to 145 ℃, and when the control unit receives a signal transmitted by the temperature sensor and detects that the current motor temperature exceeds 145 ℃, an over-temperature alarm is performed.
S133-2: and controlling the circulating water pump and the heat dissipation fan to operate at the maximum power, and/or reducing the operating power of the motor.
In this embodiment, when the motor performs an over-temperature alarm, one cooling mode is that the control unit controls the circulating water pump controller to drive the circulating water pump to operate at the maximum power, and controls the cooling fan controller to drive the cooling fan to operate at the maximum power. Another way is to reduce the operating power of the motor, which reduces the rotating speed of the motor and the heat dissipated by the motor. When the motor is over-temperature alarming, the two modes can be used together to achieve the best heat dissipation effect.
S133-3: and if the over-temperature alarm time exceeds the preset maximum alarm time, controlling the motor to stop running.
In this embodiment, if the over-temperature alarm time exceeds the maximum preset alarm time, the time that the motor is in the over-temperature state exceeds the safety time limit, and the motor controller may be seriously damaged or other components may be damaged if the motor continues to be in the over-temperature state, so that the motor is controlled to stop running at this time, and a dangerous event is prevented. And if the temperature of the motor is detected to be reduced to be lower than the alarm temperature within the maximum preset alarm time, stopping over-temperature alarm.
In an example, the maximum preset alarm time is set to be 3 minutes, when the time that the motor is in the questioning state exceeds 3 minutes, the motor and components of the motor controller are seriously damaged, at the moment, the control unit sends a stop signal, and the motor controller controls the motor to stop running. And if the temperature of the motor is detected to be reduced to be lower than the alarm temperature within 3 minutes, stopping over-temperature alarm.
And S14, controlling the circulating water pump to operate at the required rotating speed of the circulating water pump, and controlling the heat dissipation fan to operate at the required rotating speed of the heat dissipation fan.
In this embodiment, the rotation speed of the circulation water pump and the rotation speed of the cooling fan are controlled by controlling the power of the circulation water pump and the power of the cooling fan, and the power of the circulation water pump and the power of the cooling fan are in direct proportion to the rotation speed of the circulation water pump and the rotation speed of the cooling fan.
In this embodiment, circulating water pump is connected with circulating water pump controller, and radiator fan is connected with radiator fan controller. The control unit determines the required rotating speed of the circulating water pump, further determines the running power of the circulating water pump, sends the power signal to the circulating water pump controller, and the circulating water pump controller adjusts the power of the circulating water pump to enable the circulating water pump to operate at the required rotating speed. After the control unit determines the required rotating speed of the cooling fan, the operating power of the cooling fan is further determined, the power signal is sent to the cooling fan controller, and the cooling fan controller adjusts the power of the cooling fan to enable the cooling fan to operate at the required rotating speed.
In this embodiment, when controlling circulating water pump and radiator fan's operation, the control unit can determine corresponding coolant flow and air mass flow according to the rotational speed flow characteristic curve of water pump and fan, and when the temperature was higher, increase the flow of coolant flow and air, reduce the coolant temperature, strengthen the heat radiation intensity of radiator, when the temperature was lower, can suitably reduce the flow of coolant and the flow of air, when guaranteeing the control motor temperature, reduce the power consumption.
Performing S11-S14 of the present embodiment, detecting a temperature of the motor and a rate of change of the temperature; determining a cooling mode according to a temperature of the motor and a rate of change of the temperature; determining the required rotating speed of a circulating water pump and the required rotating speed of a cooling fan according to the temperature of the motor, the change rate of the temperature and the cooling mode; and controlling the circulating water pump to operate at the required rotating speed of the circulating water pump, and controlling the cooling fan to operate at the required rotating speed of the cooling fan. The power of a circulating water pump and the power of a cooling fan in a cooling system are controlled by detecting the temperature of the motor to dissipate heat of the motor, different powers are adopted to control the rotating speeds of the circulating water pump and the cooling fan at different motor temperatures, and the power consumption of the whole vehicle is reduced while the motor temperature is effectively controlled. And when the motor temperature is lower, with circulating water pump and radiator fan in the lower power operation cooling system, promoted the NVH performance of whole car.
Fig. 2 is a logic diagram of motor temperature control proposed in the present application, as shown in fig. 2, and fig. 2 shows the relationship between the rotation speed of the circulating water pump and the cooling fan and the control mode of the cooling system, the detected motor temperature and the current temperature change rate.
Y in the graph represents yes, N represents no, T represents the detected motor temperature, and dT represents the rate of change of the temperature. The logic shown in the figure is that when the collected motor temperature is less than 65 ℃, the motor temperature is detected again; when the temperature of the motor is detected to be higher than 65 ℃, detecting whether the temperature of the motor is lower than 70 ℃, if the temperature of the motor is lower than 70 ℃, detecting whether the change rate of the temperature is lower than 1, if the change rate of the temperature is lower than 1, closing the water pump and the fan, and if the change rate of the temperature is higher than 1, operating the water pump at a low speed and closing the fan; when the temperature of the motor is detected to be higher than 70 ℃, detecting whether the temperature of the motor is lower than 80 ℃, if the temperature of the motor is lower than 80 ℃, detecting whether the temperature change rate is lower than 1, if the temperature change rate is lower than 1, operating the water pump at a medium speed and operating the fan at a low speed, and if the temperature change rate is higher than 1, adopting a fuzzy control mode; when the temperature of the motor is detected to be higher than 80 ℃, whether the temperature of the motor is higher than 145 ℃ is detected, if not, a fuzzy control mode is adopted, if yes, the motor is alarmed to be over-temperature, the water pump fan runs at the highest power, the motor is operated at the reduced power, and if the alarming time is longer than 3 minutes, the motor is stopped. Wherein, 65 ℃ is a first preset temperature, 70 ℃ is a second preset temperature, 80 ℃ is a third preset temperature, and 145 ℃ is a fourth preset temperature.
Based on the same inventive concept, an embodiment of the present application provides a motor temperature control device. Referring to fig. 3, fig. 3 is a schematic diagram of a motor temperature control apparatus according to an embodiment of the present application. As shown in fig. 3, the apparatus 300 includes:
a temperature detection module 301, configured to detect a temperature of the motor and a rate of change of the temperature;
a cooling mode determination module 302 for determining a cooling mode based on a temperature of the electric machine and a rate of change of the temperature;
a required rotation speed determination module 303, configured to determine a required rotation speed of the water circulation pump and a required rotation speed of the cooling fan according to the temperature of the motor, the change rate of the temperature, and the cooling mode;
a rotation speed control module 304, configured to control the water circulation pump to operate at a required rotation speed of the water circulation pump, and control the cooling fan to operate at the required rotation speed of the cooling fan.
Optionally, the temperature detection module includes:
the temperature signal receiving submodule is used for receiving the temperature signal of the motor, which is acquired by the temperature sensor;
and the temperature determining submodule is used for determining the temperature of the motor and the change rate of the temperature according to the temperature signal of the motor.
Optionally, the cooling mode determination sub-module includes:
the first mode determination submodule is used for determining that the cooling mode is a threshold value control mode when the temperature of the motor is between a first preset temperature and a second preset temperature;
the second mode determination submodule is used for determining that the cooling mode is a threshold value control mode when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is less than 1;
a third mode determination submodule, configured to determine that the cooling mode is a fuzzy control mode when the temperature of the motor is between a second preset temperature and a third preset temperature and a change rate of the temperature is greater than 1;
a fourth mode determination submodule configured to determine that the cooling mode is the fuzzy control mode when the temperature of the motor is between a third preset temperature and a fourth preset temperature;
and the temperatures of the first preset temperature and the fourth preset temperature are sequentially increased.
Optionally, the required rotation speed determination module includes:
a threshold control mode rotation speed determination submodule configured to determine a required rotation speed of the circulation water pump and a required rotation speed of the radiator fan according to the motor temperature and the rate of change in the temperature when the cooling mode is the threshold control mode, and including:
a first rotation speed determination submodule for turning off the circulating water pump and the heat dissipation fan when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is less than 1;
a second rotation speed determination submodule, configured to, when the temperature of the motor is between the first preset temperature and the second preset temperature and a change rate of the temperature is greater than 1, turn off the heat dissipation fan when a required rotation speed of the circulation water pump is a first preset speed;
and a third rotating speed determining submodule, configured to set the required rotating speed of the circulating water pump to a second preset speed and set the required rotating speed of the heat dissipation fan to a third preset speed when the motor temperature is between the second preset temperature and the third preset temperature and the change rate of the temperature is less than 1, where the second preset speed is greater than the first preset speed.
A fuzzy control mode rotation speed determination submodule for determining a required rotation speed of the circulation water pump and a required rotation speed of the radiator fan according to the motor temperature and the rate of change in the temperature when the cooling mode is the fuzzy control mode, comprising:
and the fourth rotating speed determining submodule is used for adaptively adjusting the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the temperature of the motor and the change rate of the temperature when the temperature control mode is the fuzzy control mode.
Optionally, the cooling mode determination sub-module further comprises:
and the cooling system closing submodule is used for closing the circulating water pump and the cooling fan when the temperature of the motor is lower than the first preset temperature.
Optionally, the cooling mode determination module further comprises:
the over-temperature alarm sub-module is used for carrying out over-temperature alarm on the motor when the temperature of the motor is higher than the fourth preset temperature;
the power control submodule is used for controlling the circulating water pump and the cooling fan to operate at the maximum power and/or reducing the operating power of the motor;
and the overtime stop submodule is used for controlling the motor to stop running if the overtemperature alarm time exceeds the preset maximum alarm time.
Based on the same inventive concept, another embodiment of the present application provides an automobile, including: a control unit; the control unit is adapted to implement the steps in the method according to the first aspect of the application.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these 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 the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method, the device and the automobile for controlling the motor temperature provided by the application are introduced in detail, specific examples are applied in the description to explain the principle and the implementation mode of the application, and the description of the embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (9)

1. A method of controlling temperature of a motor, the method comprising:
detecting a temperature of the motor and a rate of change of the temperature;
determining a cooling mode according to a temperature of the motor and a rate of change of the temperature;
determining the required rotating speed of a circulating water pump and the required rotating speed of a cooling fan according to the temperature of the motor, the change rate of the temperature and the cooling mode;
and controlling the circulating water pump to operate at the required rotating speed of the circulating water pump, and controlling the cooling fan to operate at the required rotating speed of the cooling fan.
2. The method of claim 1, wherein detecting the temperature of the motor and the rate of change of the temperature comprises:
receiving a temperature signal of the motor acquired by a temperature sensor;
and determining the temperature of the motor and the change rate of the temperature according to the temperature signal of the motor.
3. The method of claim 1, wherein determining a cooling mode based on a temperature of the electric machine and a rate of change of the temperature comprises:
when the temperature of the motor is between a first preset temperature and a second preset temperature, the cooling mode is a threshold value control mode;
when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is less than 1, the cooling mode is a threshold value control mode;
when the temperature of the motor is between a second preset temperature and a third preset temperature and the change rate of the temperature is greater than 1, the cooling mode is a fuzzy control mode;
when the temperature of the motor is between a third preset temperature and a fourth preset temperature, the cooling mode is a fuzzy control mode;
and the temperatures of the first preset temperature and the fourth preset temperature are sequentially increased progressively.
4. The method according to claim 3, wherein determining the required rotation speed of the circulation water pump and the required rotation speed of the radiator fan according to the motor temperature and the rate of change in the temperature when the cooling mode is the threshold control mode includes:
when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is less than 1, the circulating water pump and the heat dissipation fan are turned off;
when the temperature of the motor is between the first preset temperature and the second preset temperature and the change rate of the temperature is greater than 1, the required rotating speed of the circulating water pump is a first preset speed, and the cooling fan is turned off;
when the motor temperature is between the second preset temperature and the third preset temperature and the change rate of the temperature is less than 1, the required rotating speed of the circulating water pump is the second preset speed, the required rotating speed of the cooling fan is the third preset speed, and the second preset speed is greater than the first preset speed.
5. The method according to claim 3, wherein determining the required rotation speed of the circulation water pump and the required rotation speed of the radiator fan according to the motor temperature and the rate of change in the temperature when the cooling mode is the fuzzy control mode includes:
and when the temperature control mode is the fuzzy control mode, adaptively adjusting the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the motor temperature and the change rate of the temperature.
6. The method of claim 3, further comprising:
and when the temperature of the motor is lower than the first preset temperature, the circulating water pump and the heat dissipation fan are closed.
7. The method of claim 3, further comprising:
when the temperature of the motor is higher than the fourth preset temperature, performing motor over-temperature alarm;
controlling the circulating water pump and the heat dissipation fan to operate at the maximum power, and/or reducing the operating power of the motor;
and if the over-temperature alarm time exceeds the preset maximum alarm time, controlling the motor to stop running.
8. A temperature control apparatus for an electric motor, the apparatus comprising:
the temperature detection module is used for detecting the temperature of the motor and the change rate of the temperature;
a cooling mode determination module for determining a cooling mode based on a temperature of the electric machine and a rate of change of the temperature;
the required rotating speed determining module is used for determining the required rotating speed of the circulating water pump and the required rotating speed of the cooling fan according to the temperature of the motor, the change rate of the temperature and the cooling mode;
and the rotating speed control module is used for controlling the circulating water pump to operate at the required rotating speed of the circulating water pump and controlling the cooling fan to operate at the required rotating speed of the cooling fan.
9. An automobile, characterized in that the automobile comprises: a control unit;
the control unit is adapted to carry out the steps of the method according to any one of claims 1 to 7.
CN202011524420.1A 2020-12-21 2020-12-21 Motor temperature control method and device and automobile Pending CN114649996A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011524420.1A CN114649996A (en) 2020-12-21 2020-12-21 Motor temperature control method and device and automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011524420.1A CN114649996A (en) 2020-12-21 2020-12-21 Motor temperature control method and device and automobile

Publications (1)

Publication Number Publication Date
CN114649996A true CN114649996A (en) 2022-06-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011524420.1A Pending CN114649996A (en) 2020-12-21 2020-12-21 Motor temperature control method and device and automobile

Country Status (1)

Country Link
CN (1) CN114649996A (en)

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