Creep torque control method in starting stage of electric vehicle

Abstract

The invention relates to a creep torque control method in the starting stage of an electric vehicle. The creep torque control method specifically comprises the steps that under the situations that theelectric vehicle is static and a brake pedal and an accumulator pedal are not stepped, a gear position of a gearbox is engaged to a forward gear or a reverse gear, and the torque of a driving motor is controlled through the following steps that 1, the torque of the driving motor is increased from zero to the first torque at the first acceleration; 2, the torque of the driving motor is kept unchanged; 3, when the travelling speed of the electric vehicle reaches the first speed, the torque of the driving motor is decreased at the second acceleration; 4, when the travelling speed of the electricvehicle reaches the second speed, decreasing of the torque of the driving motor is stopped; and 5, the torque of the driving motor is subjected to PI adjustment through the difference value between the actual traveling speed of the electric vehicle and the target creep speed, and thus the traveling speed of the electric vehicle is stabilized at the target creep speed. The creep function of the electric vehicle in the starting stage is achieved, control is precise and reliable, and the control process is scientific and reasonable.

Description

technical field [0001] The invention relates to a creep torque control method of an electric vehicle, in particular to a creep torque control method at the start-up stage of the electric vehicle. Background technique: [0002] As a new energy vehicle, electric vehicles can solve the exhaust emissions caused by fuel combustion of traditional automobile engines. They have the advantages of low environmental pollution, low noise, and high efficiency. They are an important trend in the development of the transportation industry in the future. [0003] At present, there are many electric vehicle brands and models in the domestic market, but many manufacturers lack experience in new energy vehicle system matching and electronic control development, and insufficient technology accumulation, resulting in many models not having creeping functions. After the vehicle is powered on at high voltage, the transmission gear is shifted to the forward / reverse gear, and the vehicle must be ste...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many electric vehicle brands and models in the domestic market, but many manufacturers lack experience in new energy vehicle system matching and electronic control development, and insufficient technology accumulation, resulting in many models not having creeping functions

After the vehicle is powered on at high voltage, the transmission gear is shifted to the forward / reverse gear, and the vehicle must be stepped on the accelerator to start walking after the brake pedal is released; or the vehicle performs poorly during creeping, prone to shaking and Frustration

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