Energy recovery method and device for electric car

Abstract

The invention provides an energy recovery method and an energy recovery device for an electric car. The method comprises the steps of when detecting that the electric car currently meets an energy recovery activation condition, computing a maximum recoverable torque T_max (MotorBrake) of a whole car according to theoretical torque of a front motor and a rear motor; detecting the working condition of the electric car, if the car is in the brake condition, computing designed brake torque T (Brake) of the whole car according to a current road adhesion coefficient, if the T_max (MotorBrake) is not less than the T (Brake), only applying braking forces to the front and rear motors without applying hydraulic braking forces to a front shaft and a rear shaft, and if the T_max (MotorBrake) is less than the T (Brake), applying the hydraulic braking forces to the front and rear shafts, and meanwhile applying the braking forces to the front and rear motors. According to the method and the device provided by the invention, energy recovery of the dual-shaft dual-motor electric car is achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an energy recovery method and device for electric vehicles. Background technique [0002] At present, pure electric vehicles are in the initial stage of industrialization, and single-motor single-axis drive structure schemes are more common. Based on such technical solutions, there are relatively mature single-axis drive pure electric powertrain control methods on the market. However, the form of pure single-motor drive limits the improvement of the overall performance of electric vehicles, while the form of dual-motor drive provides more options for electric vehicle power integration control. [0003] Compared with the traditional single-axis drive power system control method, the dual-axis dual-motor pure electric vehicle power system control method has different requirements and characteristics. For electric vehicles with dual drive shafts and dual motors, the cont...

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Problems solved by technology

[0005] For the energy recovery of dual motors, the existing control scheme is usually based on the comparison between the current maximum recyclable power and the braking demand power to judge whether to perform energy recovery in different modes of single motor or dual motors. Realize high-efficiency braking and dual-axis dual-motor energy recovery control under different working conditions, and there are few researches on the braking force distribution scheme in energy recovery control

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