CN107499180B - Pure electric vehicle power control method and system - Google Patents

Pure electric vehicle power control method and system Download PDF

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Publication number
CN107499180B
CN107499180B CN201710660764.7A CN201710660764A CN107499180B CN 107499180 B CN107499180 B CN 107499180B CN 201710660764 A CN201710660764 A CN 201710660764A CN 107499180 B CN107499180 B CN 107499180B
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power
driving motor
battery
output
power battery
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CN107499180A (en
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陈磊
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14Preventing excessive discharging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/25Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by controlling the electric load
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/40Drive Train control parameters
    • B60L2240/42Drive Train control parameters related to electric machines
    • B60L2240/423Torque
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/40Drive Train control parameters
    • B60L2240/54Drive Train control parameters related to batteries
    • B60L2240/545Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/40Drive Train control parameters
    • B60L2240/54Drive Train control parameters related to batteries
    • B60L2240/547Voltage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2250/00Driver interactions
    • B60L2250/10Driver interactions by alarm
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

Abstract

The invention provides a pure electric vehicle power control method and a system, wherein the method comprises the following steps: detecting the voltage of a power battery, the residual electric quantity of the power battery and the current temperature of the power battery; looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery; and acquiring the output power of a driving motor, and if the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is greater than a set threshold value, limiting the torque output by the driving motor to enable the output power of the driving motor to be smaller than the maximum allowable output power of the current power battery. The invention can solve the problems that the power battery is easy to be over-discharged and the service life of the power battery is shortened in the use process of the existing pure electric vehicle, and can effectively improve the safety of the power battery.

Description

Pure electric vehicle power control method and system
Technical Field
The invention relates to the technical field of automobile control, in particular to a power control method and system for a pure electric vehicle.
Background
The power battery is the only power source of the pure electric vehicle, the performance of the power battery is directly influenced by the quality of the power battery, the electrical performance of the power battery is influenced by various factors such as environmental temperature, stability and charged electricity quantity due to the limitation of the technical conditions of the current power battery industry, the variation range of the electrical performance is large, and the electrical performance change of the power battery cannot be intelligently identified by the traditional drive control strategy of the electric vehicle. If the power battery is discharged at high power in order to meet the power requirement of the whole vehicle, the power battery is easy to be over-discharged, and the service life of the power battery can be reduced. How to correlate the motor output power of the automobile with the electric quantity of the power battery, on one hand, the power battery can be effectively protected, and on the other hand, the whole automobile can also exert the maximum performance, so that the service performance of the whole automobile is realized to the maximum extent under the condition of ensuring the safety of the battery and the service life of the battery.
Disclosure of Invention
The invention provides a power control method and a power control system for a pure electric vehicle, which solve the problems that the power battery is easy to over-discharge and the service life of the power battery is shortened in the use process of the existing pure electric vehicle, and can effectively improve the safety of the power battery and improve the coordination capability of the running of the whole vehicle.
In order to achieve the above purpose, the invention provides the following technical scheme:
a pure electric vehicle power control method comprises the following steps:
detecting the voltage of a power battery, the residual electric quantity of the power battery and the current temperature of the power battery;
looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery;
and acquiring the output power of a driving motor, and if the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is greater than a set threshold value, limiting the torque output by the driving motor to enable the output power of the driving motor to be smaller than the maximum allowable output power of the current power battery.
Preferably, the method further comprises the following steps:
detecting the single voltage of the power battery;
and when the single voltage is smaller than a set voltage threshold value, reducing the output power of the power battery, and reducing the weight of the output power of the single battery corresponding to the single voltage.
Preferably, the method further comprises the following steps:
detecting the opening degree of an accelerator pedal within a certain time period, and calculating to obtain the average opening degree of the accelerator pedal;
obtaining the average output power of the driving motor according to the relation table of the opening degree of the accelerator pedal and the output power of the driving motor;
and if the average output power of the driving motor is greater than the maximum allowable output power of the current power battery, limiting the torque output by the driving motor, and enabling the average output power of the driving motor to be less than the maximum allowable output power of the current power battery.
Preferably, the limiting the torque output by the driving motor includes:
setting the maximum torque which can be output by the driving motor, and enabling the torque output by the driving motor to be smaller than the maximum torque;
or reducing the torque output by the driving motor to a set torque.
Preferably, the method further comprises the following steps:
when the torque output by the driving motor is limited, power limiting prompt information is sent;
and when the single voltage is smaller than the set voltage threshold, sending power reduction prompt information.
Preferably, the method further comprises the following steps:
and calculating the mileage according to the residual electric quantity of the power battery, and sending out power shortage alarm information when the mileage is less than a set mileage threshold value.
The invention also provides a pure electric vehicle power control system, which comprises: the device comprises a first detection unit, a first table look-up unit and a first power control unit;
the first detection unit is used for detecting the voltage of the power battery, the residual electric quantity of the power battery, the current temperature of the power battery and the output power of the driving motor;
the first table look-up unit is used for looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery;
the first power control unit is used for limiting the torque output by the driving motor when the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is larger than a set threshold value, so that the output power of the driving motor is smaller than the maximum allowable output power of the current power battery.
Preferably, the method further comprises the following steps: a second detection unit and a second power control unit;
the second detection unit is also used for detecting the single voltage of the power battery;
and the second power control unit is used for reducing the output power of the power battery and reducing the weight of the output power of the single battery corresponding to the single voltage when the single voltage is smaller than a set voltage threshold value.
Preferably, the method further comprises the following steps: a third detection unit and a third power control unit;
the third detection unit is used for detecting the opening degree of an accelerator pedal within a certain time period and calculating to obtain the average opening degree of the accelerator pedal;
and the third power control unit is used for limiting the torque output by the driving motor when the average output power of the driving motor is greater than the maximum allowable output power of the current power battery, so that the average output power of the driving motor is smaller than the maximum allowable output power of the current power battery.
Preferably, the method further comprises the following steps: a prompt unit and a charging control unit;
the prompting unit is used for sending power limiting prompting information when limiting the torque output by the driving motor;
the prompting unit is also used for sending power reduction prompting information when the monomer voltage is smaller than a set voltage threshold;
the charging control unit is used for calculating the mileage according to the residual electric quantity of the power battery, and controlling the vehicle-mounted charger to charge the power battery when the mileage is less than a set mileage threshold value.
The invention provides a power control method and a power control system for a pure electric vehicle, which limit the output torque of a driving motor by comparing the maximum allowable output power of a power battery with the output power of the driving motor and send alarm prompt information so as to solve the problems that the power battery is easy to over-discharge and the service life of the power battery is shortened in the use process of the existing pure electric vehicle, and can effectively improve the safety of the power battery and improve the coordination capability of the running of the whole vehicle.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIG. 1: the schematic diagram of the power control method of the pure electric vehicle is provided by the invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problems that the power battery is easy to generate power and is overdischarged and the service life of the power battery is shortened in the using process of the current pure electric vehicle, the invention provides a power control method and a power control system of the pure electric vehicle.
As shown in fig. 1, a method for controlling power of a pure electric vehicle includes the following steps:
s1: detecting the voltage of a power battery, the residual electric quantity of the power battery and the current temperature of the power battery;
s2: looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery;
s3: and acquiring the output power of a driving motor, and if the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is greater than a set threshold value, limiting the torque output by the driving motor to enable the output power of the driving motor to be smaller than the maximum allowable output power of the current power battery.
Further, the method also includes:
s4: detecting the single voltage of the power battery;
s5: and when the single voltage is smaller than a set voltage threshold value, reducing the output power of the power battery, and reducing the weight of the output power of the single battery corresponding to the single voltage.
Still further, the method further comprises:
s6: detecting the opening degree of an accelerator pedal within a certain time period, and calculating to obtain the average opening degree of the accelerator pedal;
s7: obtaining the average output power of the driving motor according to the relation table of the opening degree of the accelerator pedal and the output power of the driving motor;
s8: and if the average output power of the driving motor is greater than the maximum allowable output power of the current power battery, limiting the torque output by the driving motor, and enabling the average output power of the driving motor to be less than the maximum allowable output power of the current power battery.
Specifically, the current maximum allowable charging and discharging power of the power battery in different use temperatures, different electric quantities and different attenuation states is obtained by directly collecting the real-time total voltage, the temperature, the residual electric quantity and the like of the power battery. The output power of the driving motor is detected in real time, when the difference between the maximum allowable output power of the power battery and the output power of the driving motor is large, the torque of the driving motor is limited, the performance of the power battery is protected, the whole vehicle dynamic performance is maximized, and the intelligent control of the output power of the pure electric vehicle is achieved under different use environments, different battery electric quantities and different use requirements. Meanwhile, the opening degree of an accelerator pedal in a certain period is detected to obtain the average output power of the motor, and when the difference between the maximum allowable output power of the power battery and the average output power of the motor is large, the torque of the driving motor is limited. Because the power battery is composed of each single battery, the voltage of each single battery directly influences the voltage of the power battery, when the voltage of each single battery is less than the set voltage, the power battery needs to perform the equalization operation on each single battery, the weight of the output power of each single battery is reduced, the electric quantity consumption of each single battery can be reduced, the output voltage of each single battery is kept consistent, and the service life of each single battery is prolonged.
The limiting the torque output by the driving motor includes: setting the maximum torque which can be output by the driving motor, and enabling the torque output by the driving motor to be smaller than the maximum torque; or reducing the torque output by the driving motor to a set torque.
The method further comprises the following steps: when the torque output by the driving motor is limited, power limiting prompt information is sent; and when the single voltage is smaller than the set voltage threshold, sending power reduction prompt information.
Further, still include: and calculating the mileage according to the residual electric quantity of the power battery, controlling the vehicle-mounted charger to charge the power battery if the mileage is less than a set mileage threshold value, and sending charging demand information.
Therefore, the power control method of the pure electric vehicle limits the output torque of the driving motor by comparing the maximum allowable output power of the power battery with the output power of the driving motor and sends the alarm prompt information, so that the problems that the power battery is easy to over-discharge and the service life of the power battery is shortened in the use process of the existing pure electric vehicle are solved, the safety of the power battery can be effectively improved, and the coordination capability of the running of the whole vehicle is improved.
The invention also provides a pure electric vehicle power control system, which comprises: the device comprises a first detection unit, a first table look-up unit and a first power control unit. The first detection unit is used for detecting the voltage of the power battery, the residual capacity of the power battery, the current temperature of the power battery and the output power of the driving motor. And the first table look-up unit is used for looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery. The first power control unit is used for limiting the torque output by the driving motor when the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is larger than a set threshold value, so that the output power of the driving motor is smaller than the maximum allowable output power of the current power battery.
Further, still include: a second detection unit and a second power control unit. The second detection unit is also used for detecting the cell voltage of the power battery. And the second power control unit is used for reducing the output power of the power battery and reducing the weight of the output power of the single battery corresponding to the single voltage when the single voltage is smaller than a set voltage threshold value.
Still further, the system further comprises: a third detection unit and a third power control unit. The third detection unit is used for detecting the opening degree of an accelerator pedal in a certain time period and calculating the average opening degree of the accelerator pedal. And the third power control unit is used for limiting the torque output by the driving motor when the average output power of the driving motor is greater than the maximum allowable output power of the current power battery, so that the average output power of the driving motor is smaller than the maximum allowable output power of the current power battery.
The method further comprises the following steps: a prompt unit and a charging control unit;
the prompting unit is used for sending power limiting prompting information when limiting the torque output by the driving motor; the prompting unit is further used for sending power reduction prompting information when the single voltage is smaller than a set voltage threshold. The charging control unit is used for calculating the mileage according to the residual electric quantity of the power battery, and controlling the vehicle-mounted charger to charge the power battery when the mileage is less than a set mileage threshold value.
Therefore, the power control system of the pure electric vehicle limits the output torque of the driving motor by comparing the maximum allowable output power of the power battery with the output power of the driving motor and sends the alarm prompt information, so that the problems that the power battery is easy to over-discharge and the service life of the power battery is shortened in the use process of the existing pure electric vehicle are solved, the safety of the power battery can be effectively improved, and the coordination capability of the running of the whole vehicle is improved.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.

Claims (6)

1. A power control method for a pure electric vehicle is characterized by comprising the following steps:
detecting the voltage of a power battery, the residual electric quantity of the power battery and the current temperature of the power battery;
looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery;
acquiring the output power of a driving motor, and if the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is greater than a set threshold value, limiting the torque output by the driving motor to enable the output power of the driving motor to be smaller than the maximum allowable output power of the current power battery;
detecting the opening degree of an accelerator pedal within a certain time period, and calculating to obtain the average opening degree of the accelerator pedal;
obtaining the average output power of the driving motor according to the relation table of the opening degree of the accelerator pedal and the output power of the driving motor;
if the average output power of the driving motor is larger than the maximum allowable output power of the current power battery, limiting the torque output by the driving motor, and enabling the average output power of the driving motor to be smaller than the maximum allowable output power of the current power battery;
detecting the single voltage of the power battery;
and when the monomer voltage is smaller than a set voltage threshold value, reducing the output power of the power battery, reducing the weight of the output power of the monomer battery corresponding to the monomer voltage, and carrying out equalization operation on each monomer battery by the power battery so as to reduce the electric quantity consumption of the monomer battery.
2. The pure electric vehicle power control method according to claim 1, wherein the limiting the torque output by the drive motor comprises:
setting the maximum torque which can be output by the driving motor, and enabling the torque output by the driving motor to be smaller than the maximum torque;
or reducing the torque output by the driving motor to a set torque.
3. The pure electric vehicle power control method according to claim 2, further comprising:
when the torque output by the driving motor is limited, power limiting prompt information is sent;
and when the single voltage is smaller than the set voltage threshold, sending power reduction prompt information.
4. The pure electric vehicle power control method according to claim 3, further comprising:
and calculating the mileage according to the residual electric quantity of the power battery, and controlling the vehicle-mounted charger to charge the power battery when the mileage is less than a set mileage threshold value.
5. A pure electric vehicle power control system, comprising: the device comprises a first detection unit, a first table look-up unit, a first power control unit, a second detection unit and a second power control unit;
the first detection unit is used for detecting the voltage of the power battery, the residual electric quantity of the power battery, the current temperature of the power battery and the output power of the driving motor;
the first table look-up unit is used for looking up a table according to the voltage, the residual electric quantity and the current temperature to obtain the maximum allowable output power of the current power battery;
the first power control unit is used for limiting the torque output by the driving motor when the difference value between the output power of the driving motor and the maximum allowable output power of the current power battery is larger than a set threshold value, so that the output power of the driving motor is smaller than the maximum allowable output power of the current power battery;
a third detection unit and a third power control unit;
the third detection unit is used for detecting the opening degree of an accelerator pedal within a certain time period and calculating to obtain the average opening degree of the accelerator pedal;
the third power control unit is used for limiting the torque output by the driving motor when the average output power of the driving motor is greater than the maximum allowable output power of the current power battery, so that the average output power of the driving motor is smaller than the maximum allowable output power of the current power battery;
the second detection unit is also used for detecting the single voltage of the power battery; and the second power control unit is used for reducing the output power of the power battery and reducing the weight of the output power of the single battery corresponding to the single voltage when the single voltage is smaller than a set voltage threshold value, and the power battery performs balancing operation on each single battery to reduce the electric quantity consumption of the single battery.
6. The electric vehicle power control system of claim 5, further comprising: a prompt unit and a charging control unit;
the prompting unit is used for sending power limiting prompting information when limiting the torque output by the driving motor;
the prompting unit is also used for sending power reduction prompting information when the monomer voltage is smaller than a set voltage threshold;
the charging control unit is used for calculating the mileage according to the residual electric quantity of the power battery, and controlling the vehicle-mounted charger to charge the power battery when the mileage is less than a set mileage threshold value.
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