Electric automobile sliding energy recovery control method

Abstract

The invention discloses an electric vehicle sliding energy recovery control method. The method comprises the steps: enabling a vehicle control unit system to recognize the driving intention of a driver as sliding; calculating the vehicle acceleration according to the vehicle speed change delta(v) in a preset fixed time period delta (T): in the sliding state, enabling the vehicle control unit system to judge whether the current road condition enters the downhill working condition or not according to the vehicle acceleration in the previous historical time period: if yes, enabling the vehicle control unit system to judge that the current road condition is the downhill working condition, increasing the torque dT on the basis of the current sliding recovery torque, and outputting a sliding recovery torque request to a vehicle electric drive system; if not, enabling the vehicle control unit system to judge that the current road condition is a non-downhill condition, and calculating and outputting the basic sliding recovery torque T0 to the vehicle electric driving system. According to the electric vehicle sliding energy recovery control method, when the vehicle goes downhill, if it is found that the sliding speed is continuously increased, the sliding energy recovery torque is increased, the energy recovery rate of the downhill sliding working condition is improved, and meanwhile the danger that the speed is continuously increased under the downhill working condition can be avoided.

Description

technical field [0001] The invention relates to an electric vehicle energy recovery control technology, in particular to an electric vehicle sliding energy recovery control method. Background technique [0002] Electric vehicles are currently the main development direction for the automotive industry to reduce dependence on traditional fossil energy and reduce carbon emissions. However, electric vehicles still have problems of high cost of power batteries and anxiety about driving range. Reducing the energy consumption rate per unit mileage of electric vehicles by increasing the energy recovery rate of electric vehicles is an important idea to solve the problem of driving range anxiety. Most of the existing electric vehicle taxiing energy recovery control is based on the fixed value of the vehicle speed look-up table. There are a large number of long downhill roads in mountainous or plateau areas. Since most of the existing control schemes do not distinguish between flat roa...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it needs to rely on wind speed sensors, wind direction sensors, tire and ground friction system sensors and gyroscopes to obtain environmental perception parameters, and these sensors are generally not configured on low-end vehicles due to cost considerations, and the reliability of the sensors is directly It affects the reliability of vehicle downhill condition recognition and coasting energy recovery strategy, so its application range is very limited

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