Hybrid electric vehicle energy recovery decoupling control method

Abstract

The invention provides a hybrid electric vehicle energy recovery decoupling control method. At first, a vehicle controller judges whether the vehicle is in the state of accelerator loosening after rapid acceleration; if yes, the whole vehicle controller sets the engine required torque A, and then the whole vehicle controller judges whether the engine actual torque is less than or equal to the engine required torque A. If yes, the planet carrier angular acceleration epSt in the torque calculation of the large motor and the small motor is calculated according to the actual value when the energyis recovered; if not, determining whether the actual calculated value of the angular acceleration of the planet carrier is greater than or equal to 0, If so, the planet carrier angular acceleration epSt in torque calculation of large motor and small motor during energy recovery is taken as the actual value; otherwise, the planet carrier angular acceleration epSt in torque calculation of large motor and small motor during energy recovery is taken as 0. The method of the invention is simple and feasible, can avoid the phenomenon that the instantaneous charging power is large when the energy is recovered, and improves the driving smoothness of the vehicle.

Description

technical field [0001] The invention relates to the control field of a hybrid electric vehicle, in particular to an energy recovery decoupling control method for a hybrid electric vehicle. Background technique [0002] In order to save energy and reduce emissions, hybrid vehicle control technology introduces energy feedback technology and is widely used. When a hybrid car brakes or coasts, it converts the kinetic energy of the car into electrical energy, which is stored in the power battery for use during acceleration or pure electric driving. When energy is recovered, the recovery capacity mainly depends on the motor torque when the battery capacity is satisfied, and the motor torque is related to the output shaft torque of the gearbox, the engine torque and the angular acceleration of the planet carrier. The moment the driver releases the accelerator after accelerating with a large accelerator, the torque of the output shaft of the gearbox changes from positive driving to...

AI Technical Summary

Problems solved by technology

The moment the driver releases the accelerator after accelerating with a large accelerator, the torque of the output shaft of the gearbox changes from positive driving torque to negative braking feedback torque. It is still very large, and the angular acceleration of the planet carrier decreases rapidly (it changes quickly and will drop to a negative value in a short time), the positive torque of the engine, the braking feedback torque of the output shaft of the gearbox, and the negative planet carrier that pulls down the engine speed The angular acceleration makes the motor generate electricity, and the coupling of the three causes the instantaneous charging power of the battery to be too large, which may cause the battery to overvoltage

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