Method and device for predicting motor output torque of pure electric vehicle and electric vehicle

Abstract

The invention provides an estimating method and device for the pure-electric-vehicle motor output torque and an electric vehicle, and relates to the technical field of vehicle control. The estimating method includes the steps that according to preset sampling periods, three-phase currents of a motor, current inclination angles of the three-phase currents in an alpha-beta coordinate system, three-phase voltages and voltage inclination angles of the three-phase voltages in the alpha-beta coordinate system are periodically obtained; according to the current inclination angle and the voltage inclination angle which are obtained in a current sampling period, the rotating speed of the motor in the current sampling period is estimated; according to the three-phase current, the three-phase voltage, the current inclination angle and the voltage inclination angle which are obtained in the current sampling period, a reliability value of the current sampling period is obtained; according to the rotating speeds and the reliability values of all the sampling periods and preset control periods, the rotating speed of the motor in a current control period is estimated; according to the rotating speed of the motor in the current control period, the current output torque of the motor is obtained. The estimating method for the motor output torque is reliable, effective and high in accuracy, and has the good popularization value.

Description

technical field [0001] The invention belongs to the technical field of complete vehicle control, and in particular relates to a method and device for estimating the output torque of a motor of a pure electric vehicle and an electric vehicle. Background technique [0002] In the prior art, the current output torque of the driving motor of a pure electric vehicle is generally obtained by a formula compensation method, that is, the output torque of the driving motor is obtained through a torque formula and based on this, a certain compensation is performed according to the state of the vehicle. Considering that the parameters of the drive motor will change during the actual working process, the changed parameters have a great impact on the accuracy of the formula compensation method, making it unable to meet the needs of precise control of the drive motor. Contents of the invention [0003] The purpose of the embodiment of the present invention is to provide a pure electric v...

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Problems solved by technology

[0003] The purpose of the embodiment of the present invention is to provide a pure electric vehicle motor output torque estimation method, device and electric vehicle, so as to solve the problem that the calculation of the drive motor output torque by the formula compensation method in the prior art cannot meet the demand for precise control of the drive motor The problem

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