The invention discloses a torque safety monitoring and controlling method and device of an electric vehicle The method includes the steps that actual torque of a motor in the electric vehicle is obtained, and current demand torque of the electric vehicle is obtained; the current gear state of the electric vehicle is obtained; if it is judged that the current demand torque is positive demand torque according to the current gear state, torque difference is calculated according to a first formula, the actual torque and the current demand torque; if it is judged that the current demand torque is negative demand torque according to the current gear state, torque difference is calculated according to a second formula, the actual torque and the current demand torque; integration is carried out on the torque difference according to preset duration to generate an integral value; if absolute value of the integral value is larger than a first preset threshold value, an alarm is given, and preset safety control is carried out on the motor According to the torque safety monitoring and controlling method in the embodiment, the torque safety monitoring range is enlarged, torque safety monitoring capacity is improved, the larger the torque difference is, the higher response speed is, and misjudgment caused by unstable currents is avoided

Electric vehicle and torque safety monitoring and controlling method and device thereof

The invention provides an electric motor control method and system and a vehicle, wherein the electric motor control method comprises the following steps: information of a corresponding relation between quadrature-axis inductors and quadrature-axis currents is obtained, and a query table is obtained according to the corresponding relation; the query table comprises electric motor torque, electric motor rotating speed, direct-axis currents and the quadrature-axis currents that all correspond to each other; according to current electric motor torque and current electric motor rotating speed, an object direct-axis current and an object quadrature-axis current can be obtained from the query table; an electric motor can be controlled according to the object direct-axis current and the object quadrature-axis current. According to a solution provided in the invention, the information of the corresponding relation between the quadrature-axis inductors and the quadrature-axis currents is obtained, the query table is obtained according to the corresponding relation, influence of magnetic circuit saturation effects is taken into consideration, a solid foundation is laid for improvement of electric motor control performance while requirement for a real-time property is met, and a problem of low electric motor control precision of technologies of the prior art is solved.

Electric motor control method and system and vehicle

The invention provides a motor torque control method and system for an electric vehicle. The method comprises the following steps: an Id/Iq table for controlling motor torque output is obtained, torque output by a motor is calibrated according to the Id/Iq table, so that multiple groups of corresponding demanded torque calibrated values Tdemand and executing torque calibrated values Texecute of the motor can be obtained, and values of equation coefficients a, b and c are obtained by calculation according to the torque precision calibration formula: Texecute is equal to aTdemand +bTdemand+c;modified output torque of the motor is obtained according to the torque precision calibration formula and actual demanded torque, and modified Id and Iq corresponding to the modified output torque areobtained through the Id/Iq table; the torque output by the motor is modified by taking Id and Iq as PI closed-loop control parameters of motor output torque. Precision of the torque output by the motor can be improved, and use comfort and safety of the electric vehicle can be improved.

Motor torque control method and system for electric vehicle

The invention provides a torque compensation method based on motor flux-weakening open loop control. The torque compensation method comprises the following steps: the three-phase current of the motor can be detected; the actual torque of the motor can be calculated according to the three-phase current of the motor, and the torque deviation between the actual torque and the target torque of the motor can be calculated, when the motor is in the flux-weakening open loop control mode; compensation voltage can be acquired by adopting the PI adjustment of the torque deviation, and the compensation voltage can be applied to the q-axis voltage of the motor in an overlapped manner to realize the torque compensation of the motor. By adopting the torque compensation method, the bad influence of the flux-weakening open loop control on the motor actual torque can be improved, the stability, the response speed, and the control precision of the motor control system can be improved. The invention also provides a motor controller.

Torque compensation method based on motor flux-weakening open loop control and motor controller

The present invention relates to a protection method of a permanent magnet synchronous motor. The method comprises the steps of obtaining a three-phase current instantaneous value and a given torque current of the permanent magnet synchronous motor within a preset detection cycle; according to the three-phase current instantaneous value, obtaining a torque current instantaneous value of the permanent magnet synchronous motor; calculating the absolute value of the torque current instantaneous value and the given torque current as a torque current difference absolute value; according to the torque current difference absolute values of all detection cycles within the preset duration and a preset threshold value, determining whether to control the permanent magnet synchronous motor to shut down. The protection method of the permanent magnet synchronous motor of the present invention prevents the permanent magnet synchronous motor from being damaged due to an abnormal current sampling circuit. Meanwhile, the present invention also provides a protection system of the permanent magnet synchronous motor and a computer readable storage medium.

Protection method and system of permanent magnet synchronous motor and computer readable storage medium

The invention provides a torque output control system of a permanent magnet synchronous motor. The system comprises a modulation module, an inverter and the permanent magnet synchronous motor, wherein the modulation module, the inverter and the permanent magnet synchronous motor are electrically connected in sequence. The system further comprises a 3/2 conversion module, a torque calculation module, a required current calculation module, a torque comparator, a torque current compensation integral adjustment module, a torque current adder, a magnetic flow current calculation module, a torque current comparator, a magnetic flow current comparator and a current PI regulating module. On the basis of controlling torque output, and by using actual output torque as a target, the torque output control system is used for calculating torque deviation and correcting the matching relation between magnetic flow current and torque current according to the torque deviation so as to enable motor torque output to track target torque.

Torque output control system of permanent magnet synchronous motor

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Torque output control system of permanent magnet synchronous motor