CN111478646A - Temperature protection method and system for electric vehicle motor system, electric vehicle and storage medium - Google Patents
Temperature protection method and system for electric vehicle motor system, electric vehicle and storage medium Download PDFInfo
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- CN111478646A CN111478646A CN202010350485.2A CN202010350485A CN111478646A CN 111478646 A CN111478646 A CN 111478646A CN 202010350485 A CN202010350485 A CN 202010350485A CN 111478646 A CN111478646 A CN 111478646A
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- motor
- controller
- temperature
- rotating speed
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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
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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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
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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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
Abstract
The invention discloses a temperature protection method and system for an electric vehicle motor system, an electric vehicle and a storage medium, wherein the method comprises the following steps: step 1, judging whether a motor temperature sensor is abnormal or not; step 2, if yes, entering step 3, if not, entering step 4; step 3, judging whether the temperature sensor of the controller is abnormal or not, and if not, limiting the power output of the motor according to the rotating speed signal of the motor and the temperature of the controller; if so, limiting the power output of the motor and simultaneously limiting the operation time of a motor system; step 4, judging whether the temperature sensor of the controller is abnormal, if so, limiting the power output of the motor according to the motor rotating speed signal and the motor temperature change rate; if not, the power output of the motor is limited according to the motor rotating speed signal, the motor operation limiting temperature and the controller operation limiting temperature. According to the invention, when the temperature sensor of the motor system fails, the motor system can be ensured to be in a safe operation state.
Description
Technical Field
The invention belongs to the technical field of electric vehicle motor systems, and particularly relates to a temperature protection method and system for an electric vehicle motor system, an electric vehicle and a storage medium.
Background
Patent document CN103095213B discloses a motor temperature protection method, a motor control device, and a motor system, which obtain the operating temperature of a motor at the current time every other preset time, obtain an allowable parameter of the motor according to the operating temperature at the current time, and control the operating parameter of the motor at the next time to be less than or equal to the allowable parameter, so as to adjust the operating parameter of the motor in real time, and can perform preprocessing in time when the temperature of the motor is abnormal, thereby protecting the motor from over-temperature and ensuring smooth power output. The motor temperature protection method in the patent needs to monitor the temperature of the motor and the controller thereof in real time through the temperature sensor, and does not consider the motor temperature protection method when the temperature sensor of the motor and the controller thereof fails.
Therefore, it is necessary to develop a new temperature protection method and system for an electric vehicle motor system, an electric vehicle and a storage medium.
Disclosure of Invention
The invention aims to provide a temperature protection method, a temperature protection system and a storage medium for a motor system of an electric vehicle, which can ensure that the motor system is in a safe operation state when a temperature sensor of the motor system fails under the condition of not increasing the cost of the motor system, so as to avoid the safety problem of the motor system caused by the failure of the temperature sensor.
In a first aspect, the present invention provides a method for protecting a temperature of a motor system of an electric vehicle, comprising the steps of:
step 1, judging whether a motor temperature sensor is abnormal or not;
step 2, if yes, entering step 3, if not, entering step 4;
step 3, judging whether the temperature sensor of the controller is abnormal or not, and if not, limiting the power output of the motor according to the rotating speed signal of the motor and the temperature of the controller; if so, limiting the power output of the motor and simultaneously limiting the operation time of a motor system;
step 4, judging whether the temperature sensor of the controller is abnormal, if so, limiting the power output of the motor according to the motor rotating speed signal and the motor temperature change rate; if not, the power output of the motor is limited according to the motor rotating speed signal, the motor operation limiting temperature and the controller operation limiting temperature.
Further, when the motor temperature sensor and the controller temperature sensor are judged to be normal, the maximum torque T which can be output by the motor at the rotating speed is obtained by searching a preset motor external characteristic table according to a motor rotating speed signal sent by the VCU; according to the motor operation limiting temperature, obtaining the maximum torque Tm allowed to be output by the motor at the rotating speed by searching a preset motor rotating speed-motor maximum allowable torque table; and obtaining the maximum torque Tc allowed to be output by the controller at the rotating speed by checking a preset motor rotating speed-controller maximum allowable torque table according to the controller operation limiting temperature, wherein the controller outputs the minimum value of T, Tm and Tc, and the value is used as the maximum torque value allowed to be output by the motor at the rotating speed so as to limit power output.
Further, when it is judged that only the motor temperature sensor fails, the maximum torque T which can be output by the motor at the rotating speed is obtained by searching a preset motor external characteristic table according to a motor rotating speed signal sent by the VCU; and according to the monitored controller temperature signal, obtaining a corresponding control torque Tcd in the fault state by searching a preset controller temperature-control torque corresponding table, outputting the minimum value of the T and the Tcd by the controller, and taking the value as the maximum torque value allowed to be output by the motor at the rotating speed to limit power output so as to enable the controller to be in a lower power operation state.
Further, when it is judged that only the controller temperature sensor fails, the maximum torque T which can be output by the motor at the rotating speed is obtained by searching a preset motor external characteristic table according to a motor rotating speed signal sent by the VCU; and according to the monitored motor temperature variation quantity signal, obtaining a corresponding control torque Tmd under the fault state by searching a preset motor temperature variation rate-control torque corresponding table, outputting the minimum value of the T and the Tmd by the controller, and taking the value as the maximum torque value allowed to be output by the motor at the rotating speed to limit power output so as to enable the controller to be in a low-power operation state.
Further, when the motor and the temperature sensor of the controller are judged to be in fault, according to the monitored current motor rotating speed signal, the preset motor rotating speed-safe output power table and the motor rotating speed-safe operation time table are searched to obtain safe output power Ps and safe operation time t, the output power of the motor is limited to be the safe output power, and the output power is reduced to the minimum in the safe operation time.
In a second aspect, the invention provides a temperature protection system for an electric vehicle motor system, comprising a processor and a memory;
the memory having stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, may implement the steps of the method for temperature protection of an electric vehicle motor system according to the present invention.
In a third aspect, the invention provides an electric vehicle, which adopts the electric vehicle motor system temperature protection system.
In a fourth aspect, the present invention provides a storage medium storing one or more computer readable programs, which are executable by one or more processors to implement the steps of the method for protecting the temperature of an electric vehicle motor system according to the present invention.
The invention has the following advantages: under the condition that the cost of the motor system is not increased, when the temperature sensor of the motor system breaks down, the motor system can be ensured to be in a safe operation state, and the safety problem of the motor system caused by the fault of the temperature sensor is avoided.
Drawings
FIG. 1 is a flow chart of the present embodiment;
FIG. 2 is a graph showing an external characteristic of the motor according to the present embodiment;
FIG. 3 is a motor speed-maximum allowable torque curve of the motor at the motor limit temperature in the present embodiment;
FIG. 4 is a plot of motor speed versus maximum allowable torque for the controller at the limiting temperature of the controller in this embodiment;
FIG. 5 is a graph of controller temperature versus control torque for the present embodiment;
FIG. 6 is a graph of motor temperature rate-control torque in the present embodiment;
FIG. 7 is a plot of motor speed versus safe output power for the present embodiment;
fig. 8 is a graph of motor speed versus safe operating time in the present embodiment.
Detailed Description
The invention will be further explained with reference to the drawings.
In this embodiment, a method for protecting a temperature of a motor system of an electric vehicle includes the following steps:
step 1, judging whether a motor temperature sensor is abnormal or not;
step 2, if yes, entering step 3, if not, entering step 4;
step 3, judging whether the temperature sensor of the controller is abnormal or not, and if not, limiting the power output of the motor according to the rotating speed signal of the motor and the temperature of the controller; if so, limiting the power output of the motor and simultaneously limiting the operation time of a motor system;
step 4, judging whether the temperature sensor of the controller is abnormal, if so, limiting the power output of the motor according to the motor rotating speed signal and the motor temperature change rate; if not, the power output of the motor is limited according to the motor rotating speed signal, the motor operation limiting temperature and the controller operation limiting temperature.
As shown in fig. 1, in this embodiment, when the controller does not detect a fault signal of the temperature sensor, that is, when both the temperature sensor of the motor and the temperature sensor of the controller are normal, the maximum torque T that can be output by the motor at the rotation speed is obtained by looking up a preset motor external characteristic table according to a motor rotation speed signal sent by the VCU; and obtaining the maximum torque Tm allowed to be output by the motor at the rotating speed by checking a preset motor rotating speed-motor maximum allowable torque table according to the motor operation limiting temperature. Meanwhile, according to the operation limit temperature of the controller, the maximum torque Tc allowed to be output by the controller at the rotating speed is obtained by searching a preset motor rotating speed-controller maximum allowable torque table. The controller outputs the minimum value of T, Tm and Tc, and the value is taken as the maximum torque value allowed to be output by the motor at the rotating speed so as to limit the power output.
Referring to fig. 1, when the controller detects a fault signal of the motor temperature sensor but does not detect a fault signal of the controller temperature sensor (i.e., when it is determined that only the motor temperature sensor has a fault), at this time, the controller can only receive the currently acquired controller temperature signal, and for the situation, the controller temperature-control torque correspondence table is prepared by calibrating the control torque corresponding to the controller temperature when the fault occurs in advance, and the corresponding control torque Tcd in the fault state is obtained by searching the controller temperature-control torque correspondence table according to the monitored controller temperature signal. And meanwhile, according to a motor rotating speed signal sent by the VCU, the maximum torque T which can be output by the motor at the rotating speed is obtained by searching a preset motor external characteristic table. The controller outputs the minimum value of the T and the Tcd as the maximum torque value which the motor is allowed to output at the rotating speed so as to limit the power output, and the controller is in a lower power running state.
Referring to fig. 1, when it is judged that only the controller temperature sensor is out of order, i.e. when the controller detects a controller temperature sensor failure signal, but when the fault signal of the motor temperature sensor is not detected, at the moment, the controller can only receive the currently acquired motor temperature signal, the value of the motor temperature variation in a sampling period, the cooling power of the motor can be obtained by calculation, the cooling power of the motor is the heating power of the motor minus the temperature rise power of the motor, because the motor and the controller adopt the same cooling loop, according to the motor cooling power, by searching a motor cooling power-controller cooling power correspondence table which is calibrated in advance, the controller cooling power can be obtained, and the corresponding control torque under the condition can be obtained by looking up a controller cooling power-control torque table calibrated in advance according to the cooling power. Because the temperature rise power of the motor is equal to the product of the temperature variation of the motor and the heat capacity of the motor in unit time, the control torque corresponding to the value of the temperature variation of the motor in a sampling period when a fault occurs is calibrated in advance to manufacture a motor temperature variation rate-control torque corresponding table, the corresponding control torque Tmd in the fault state is obtained by searching the motor temperature variation rate-control torque corresponding table according to the monitored motor temperature variation signal, the controller outputs the minimum value of the T and the Tmd as the maximum torque value allowed to be output by the motor at the rotating speed, the power output is limited, and the controller is in a low-power operation state.
As shown in fig. 1, when it is determined that both the motor and the temperature sensor of the controller are faulty, that is, when the controller detects fault signals of both the motor temperature sensor and the controller temperature sensor, because the motor system is still in a normal performance output state at this time, the rotation speed and the power are both at high values, in order to leave enough response time for a driver in the vehicle, the motor system cannot stop outputting immediately, but the output power of the motor system should be gradually reduced to the minimum within a certain time according to the current output power of the motor system, and as the motor rotation speed is higher, the fault response time required by the driver is longer, and the motor slow deceleration time is longer. The method comprises the steps of calibrating safe output power and safe operation time corresponding to the motor rotating speed when a fault occurs in advance to manufacture a motor rotating speed-safe output power table and a motor rotating speed-safe operation time table, obtaining safe output power Ps and safe operation time t by searching the motor rotating speed-safe output power table and the motor rotating speed-safe operation time table according to a monitored current motor rotating speed signal, limiting the output power to be the safe output power, and reducing the output power to be the lowest in the safe operation time.
In this embodiment, the external characteristic table of the motor is a correspondence table between the torque and the motor rotation speed, and is displayed by an external characteristic curve of the motor (see fig. 2) in order to more intuitively display the correspondence between the torque and the motor rotation speed.
In this embodiment, the motor rotation speed-motor maximum allowable torque table is a table of correspondence between the motor rotation speed and the motor maximum allowable torque, and is shown by a motor rotation speed-motor maximum allowable torque curve (see fig. 3) in order to more intuitively show the correspondence between the motor rotation speed and the motor maximum allowable torque.
In this embodiment, the motor rotation speed-controller maximum allowable torque table is a table of correspondence between the motor rotation speed and the controller maximum allowable torque, and is shown by a motor rotation speed-controller maximum allowable torque curve (see fig. 4) in order to more intuitively show the correspondence between the motor rotation speed and the controller maximum allowable torque.
In the present embodiment, the controller temperature-control torque correspondence table is a correspondence table between the controller temperature and the control torque, and is shown by a controller temperature-control torque curve (see fig. 5) in order to more intuitively show the correspondence between the controller temperature and the control torque.
In this embodiment, the motor temperature change rate-control torque correspondence table is a correspondence table between the motor temperature change rate and the control torque, and is displayed by a motor temperature change rate-control torque curve (see fig. 6) in order to more intuitively display the correspondence between the motor temperature change rate and the control torque.
In this embodiment, the motor speed-safety output power table is a table of correspondence between the motor speed and the safety output power, and is shown by a motor speed-safety output power curve (see fig. 7) in order to more intuitively show the correspondence between the motor speed and the safety output power.
In this embodiment, the motor speed-safe operation time table is a table of correspondence between the motor speed and the safe operation time, and is shown by a motor speed-safe operation time curve (see fig. 8) in order to more intuitively show the correspondence between the motor speed and the safe operation time.
The temperature protection system for the motor system of the electric vehicle comprises a processor and a memory;
the memory having stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, can implement the steps of the method for protecting the temperature of the electric vehicle motor system as described in this embodiment.
The electric vehicle according to this embodiment employs the temperature protection system of the electric vehicle motor system as described in this embodiment.
A storage medium of this embodiment stores one or more computer readable programs, which are executable by one or more processors to implement the steps of the temperature protection method for an electric vehicle motor system as described in this embodiment.
Claims (8)
1. A temperature protection method for an electric vehicle motor system is characterized by comprising the following steps:
step 1, judging whether a motor temperature sensor is abnormal or not;
step 2, if yes, entering step 3, if not, entering step 4;
step 3, judging whether the temperature sensor of the controller is abnormal or not, and if not, limiting the power output of the motor according to the rotating speed signal of the motor and the temperature of the controller; if so, limiting the power output of the motor and simultaneously limiting the operation time of a motor system;
step 4, judging whether the temperature sensor of the controller is abnormal, if so, limiting the power output of the motor according to the motor rotating speed signal and the motor temperature change rate; if not, the power output of the motor is limited according to the motor rotating speed signal, the motor operation limiting temperature and the controller operation limiting temperature.
2. The electric vehicle motor system temperature protection method of claim 1, wherein: when the motor temperature sensor and the controller temperature sensor are judged to be normal, obtaining the maximum torque T which can be output by the motor at the rotating speed by searching a preset motor external characteristic table according to a motor rotating speed signal sent by the VCU; according to the motor operation limiting temperature, obtaining the maximum torque Tm allowed to be output by the motor at the rotating speed by searching a preset motor rotating speed-motor maximum allowable torque table; and obtaining the maximum torque Tc allowed to be output by the controller at the rotating speed by checking a preset motor rotating speed-controller maximum allowable torque table according to the controller operation limiting temperature, wherein the controller outputs the minimum value of T, Tm and Tc, and the value is used as the maximum torque value allowed to be output by the motor at the rotating speed so as to limit power output.
3. The electric vehicle motor system temperature protection method of claim 1, wherein: when the situation that only the motor temperature sensor fails is judged, the maximum torque T which can be output by the motor at the rotating speed is obtained by searching a preset motor external characteristic table according to a motor rotating speed signal sent by the VCU; and according to the monitored controller temperature signal, obtaining a corresponding control torque Tcd in the fault state by searching a preset controller temperature-control torque corresponding table, outputting the minimum value of the T and the Tcd by the controller, and taking the value as the maximum torque value allowed to be output by the motor at the rotating speed to limit power output so as to enable the controller to be in a lower power operation state.
4. The electric vehicle motor system temperature protection method of claim 1, wherein: when only the controller temperature sensor is judged to have a fault, obtaining the maximum torque T which can be output by the motor at the rotating speed by searching a preset motor external characteristic table according to a motor rotating speed signal sent by the VCU; and according to the monitored motor temperature variation quantity signal, obtaining a corresponding control torque Tmd under the fault state by searching a preset motor temperature variation rate-control torque corresponding table, outputting the minimum value of the T and the Tmd by the controller, and taking the value as the maximum torque value allowed to be output by the motor at the rotating speed to limit power output so as to enable the controller to be in a low-power operation state.
5. The electric vehicle motor system temperature protection method of claim 1, wherein: when the motor and the temperature sensor of the controller are judged to be in fault, according to the monitored current motor rotating speed signal, the preset motor rotating speed-safe output power table and the motor rotating speed-safe operation time table are searched to obtain the safe output power Ps and the safe operation time t, so that the output power of the motor is limited to be the safe output power, and the output power is reduced to the minimum in the safe operation time.
6. The utility model provides an electric motor car motor system temperature protection system which characterized in that: comprises a processor and a memory;
the memory having stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, may implement the steps of the method for protecting the temperature of an electric vehicle motor system according to any one of claims 1 to 5.
7. An electric vehicle, characterized in that: the electric vehicle motor system temperature protection system of claim 6 is employed.
8. A storage medium, characterized by: the storage medium stores one or more computer readable programs that are executable by one or more processors to implement the steps of the method for temperature protection of an electric vehicle motor system according to any one of claims 1 to 5.
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| CN202010350485.2A CN111478646B (en) | 2020-04-28 | 2020-04-28 | Temperature protection method and system for motor system of electric vehicle, electric vehicle and storage medium |
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| CN202010350485.2A CN111478646B (en) | 2020-04-28 | 2020-04-28 | Temperature protection method and system for motor system of electric vehicle, electric vehicle and storage medium |
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| CN111478646A true CN111478646A (en) | 2020-07-31 |
| CN111478646B CN111478646B (en) | 2023-04-14 |
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| CN112874318A (en) * | 2021-01-28 | 2021-06-01 | 奇瑞新能源汽车股份有限公司 | Control method and device of driving motor and vehicle |
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