An electric driving method and electric driving system for a vehicle

Abstract

The invention provides an electric drive method and an electric drive system for vehicles, and relates to the field of vehicle electronic devices. The electric drive method includes: real-time collection of the vehicle's accelerator pedal opening, brake pedal opening, vehicle speed / motor drive speed, driving mode, gear information, vehicle body electronic stability control system status and brake anti-lock braking system status; The smaller of the requested torque of the first motor and the requested torque of the second motor is used to obtain the requested torque of the motor; according to the accelerator pedal opening, brake pedal opening, driving mode, gear information, vehicle electronic stability control system status and braking The state of the anti-lock braking system controls the vehicle to enter a corresponding working state, and controls the motor output torque of the vehicle or controls the output torque of the motor to be zero according to the motor request torque. The electric driving method of the invention can improve the energy utilization rate of the vehicle.

Description

technical field [0001] The invention relates to the field of electronic appliances for vehicles, in particular to an electric drive method and an electric drive system for vehicles. Background technique [0002] The electric drive vehicle uses the driving motor to drive the vehicle. When the vehicle brakes, the power generation mode of the driving motor is used to generate electricity, and the kinetic energy of the vehicle is converted into electric energy to charge the power battery, which improves the mileage of the vehicle to a certain extent. However, there is a certain conversion efficiency in the process of converting the kinetic energy of the vehicle into electric energy. Relevant literature shows that the braking energy from the wheels through the motor is recovered and stored in the power battery, and then the power battery drives the wheels through the motor. The energy conversion efficiency of the whole process is only 50% %about. At present, the technical soluti...

AI Technical Summary

Problems solved by technology

[0003] There are many deficiencies in the existing technical solutions, for example: the vehicle is in the driving state from the small opening of the accelerator pedal to the full release of the accelerator pedal, and the driving motor works in a lower efficiency area. At this time, the driving torque generated by the driving motor is equal to The effect of zero torque on the vehicle is not much different, but there is energy consumption, and the energy consumption is poor; when the accelerator pedal and the brake pedal are released at the same time, the motor generates feedback braking to simulate the torque generated by the traditional automobile engine, which can be recovered A certain amount of electric energy, but the efficiency of the electric drive system is not fully utilized. Regenerative braking is used within a certain period of time after the brake pedal is released. If the driver really has the intention to brake, the driver must step on the brake pedal during this period. If the driver does not step on the brake pedal for more than this period of time, the driver has no braking demand, and there is no need to implement energy recovery. Repeated energy recovery when the driver has no braking demand will not only fail to achieve the recovery effect (the recovery efficiency is very low ) and it is easy to cause the failure of the electric drive system and affect the service life

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