Multi-step-section torque control implementation method for crawling running of electric vehicle

Abstract

The invention discloses a multi-step-section torque control implementation method for creeping running of an electric vehicle, which mainly comprises the following steps of: monitoring a gear signal, an accelerator pedal signal, a brake pedal signal, an automobile speed, a motor rotating speed and a motor actual output torque signal through a whole automobile controller, and determining whether the automobile is in a creeping working condition according to the monitored signals; judging whether the vehicle speed does not meet the target crawling vehicle speed according to the acquired signals, through smooth output of the set multi-step section torque, once the vehicle speed is lower than or higher than the target crawling vehicle speed, the vehicle control unit automatically runs to the set torque of the higher or lower step section in the set torque control step section; smooth increase and decrease of the torque are achieved, the stability of the target vehicle speed of the vehicle is kept, and the vehicle can automatically advance and run in a crawling mode under the slope road condition. According to the method, the driving and electric braking characteristics of the motor can be reasonably utilized, and operation of a driver is reduced.

Description

technical field [0001] The invention relates to a control method for a new energy electric vehicle, in particular to a method for realizing multi-step torque control for creeping running of an electric vehicle. Background technique [0002] With the rapid development of China's economy, people's living standards are getting higher and higher, and the purchasing power of cars has also been greatly improved, which makes my country's energy and environmental problems increasingly severe. Proceeding from the national conditions, we need to increase the research and development of electric vehicles. Since the electric passenger car works through the output torque of the motor, the driving requirements of the vehicle are realized and the vehicle generally has a creeping function. [0003] At the present stage, the creeping function of passenger cars adopts the vehicle speed as the target single torque control output form. When the vehicle creeps to a small slope or speed bump, th...

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Problems solved by technology

[0003] At the present stage, the creeping function of passenger cars adopts the vehicle speed as the target single torque control output form. When the vehicle creeps to a small slope or speed bump, the vehicle will not be able to continue because the maximum value of the single torque control has been set. purpose of moving forward

Or due to driving on a downhill road condition, without using the characteristics of electric braking of the motor, even if there is no torque output, the vehicle's inertia will also cause the vehicle speed to be higher than the set creep target vehicle speed under the creeping condition

The driver needs to step on the accelerator pedal to pass through, or reduce the creeping speed by stepping on the brake pedal, which increases the driver's excessive operation

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