Vehicle induction motor driving torque high-performance time-sharing control system and control method

Abstract

The invention discloses a vehicle induction motor driving torque high-performance time-sharing control system, which is used for an electric vehicle, and is characterized in that an induction motor state equation, a torque control sliding mode surface formula, a stator voltage formula, a space vector modulation algorithm, a sliding mode time-sharing observer and a weak magnetic regulator are stored in a vehicle-mounted ECU (Electronic Control Unit); a static coordinate system (alpha, beta) is established in the vehicle-mounted ECU, and the space vector modulation algorithm is used for generating six paths of PWM signals to control the drive circuit according to an alpha-axis component usalpha and a beta-axis component usbeta of stator voltage in the static coordinate system (alpha, beta), so that the drive circuit generates three-phase alternating current with specific amplitude and frequency, and thus the output torque T of the induction motor is controlled. The invention further discloses a corresponding control method, the induction motor can be controlled after operation according to actual working parameters fed back by the induction motor, the output torque of the induction motor is made to be close to or equal to the target driving torque Tr, and the defect that in the prior art, direct torque control brings large torque pulsation is overcome.

Description

technical field [0001] The invention belongs to the fields of automatic control, information technology and advanced manufacturing, and specifically relates to a high-performance time-sharing control method for the drive torque of an induction motor used in vehicles. Background technique [0002] Electric vehicles are becoming an increasingly popular alternative to conventional vehicles due to their potential to reduce energy consumption and pollutant emissions. Among the various drive motors used in such vehicles, AC induction motors are considered ideal due to their low cost, robustness, and ease of maintenance. [0003] The drive motor (AC induction motor) requires a high-performance torque controller to ensure that the optimal torque distribution control command from the upper controller is accurately executed on the drive wheel. [0004] However, AC induction motors pose challenges to their controller design due to their high-order nonlinearity and strong coupling char...

AI Technical Summary

Problems solved by technology

[0005] Due to the limitation of the sampling period of actual hardware equipment, direct torque control often brings large torque ripple, and the difference between the electrical time constant and mechanical time constant of the AC induction motor drive system itself leads to the time delay of torque control

[0006] In addition, in the existing direct torque control method, the observer design for estimating flux linkage based on the measurement of stator current and voltage and the design of torque controller are carried out separately, which cannot guarantee the overall consistent convergence characteristics of the closed-loop system

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