Electric vehicle motor target torque control method based on multi-parameter and multi-map graph

Abstract

The invention discloses an electric automobile motor target torque control method based on multiple parameters and multiple MAPs. The method specifically comprises the steps that a vehicle controller of an electric automobile collects accelerator pedal position signals, acceleration pedal change rate signals, battery SOC signals, vehicle speed signals and brake pedal position signals and judges vehicle control strategy according to the operation intention of a driver and vehicle condition; the vehicle controller collects motor temperature signals and inquires a torque MAP of two adjacent temperature points of an actual motor temperature point under the different vehicle driving control strategies according to the current temperature of a motor so as to obtain motor torques corresponding to two temperature points under the working condition, and a Lagrangian linear interpolation method is utilized for obtaining an initial motor target torque; the vehicle controller collects current state parameters of a power battery, and adjusts the initial motor torque so as to obtain the finial motor target torque according to the current state of the power battery. According to the invention, the motor torque output can be precisely controlled, and the vehicle travelling distance and the vehicle driving performance are improved.

Description

technical field [0001] The invention relates to electric vehicle motors, in particular to a method for controlling target torque of electric vehicle motors based on multi-parameter and multi-MAP graphs. Background technique [0002] The electric vehicle, which integrates many high-tech technologies, has the advantages of low emission pollution, low noise, etc., and has incomparable advantages in environmental protection and energy saving. It is triggering a revolution in the world's automobile industry. The working conditions of electric vehicles are complex, the operating temperature of the motor varies widely, and the motor often works in a non-linear region, requiring a large number of complex calculations. Most of the motor target torque acquisition methods on the market and in patents cannot meet the requirements, and the motor in other patents The target torque control method does not consider the change of the working temperature of the motor, so that the torque of th...

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Problems solved by technology

The working conditions of electric vehicles are complex, the operating temperature of the motor varies widely, and the motor often works in a non-linear region, requiring a large number of complex calculations. Most of the motor target torque acquisition methods on the market and in patents cannot meet the requirements, and the motor in other patents The target torque control method does not consider the change of the working temperature of the motor, so that the torque of the motor cannot be accurately controlled, and the fluctuation is large

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