Two-motor two-speed drive system and braking control method thereof

Abstract

The invention provides a dual-motor two-gear drive system and a brake control method of the dual-motor two-gear drive system. A motor controller of the dual-motor two-gear drive system is connected with a first motor and a second motor. A vehicle controller analyzes the intention of a driver according to acquired accelerator pedal signals, acquired brake pedal signals and acquired current vehicle speed signals and calculates the target rotating speed and drive torque which meet current vehicle driving requirements, and the motor controller selects torque distribution with the minimum total power loss as the optimal brake torque distribution value between the dual motors by automatically calculating power loss of different drive torque distribution of the motors. Through reasonable matching of the dual motors and two-gear gears, on the premise that effective brake is guaranteed, brake energy is recycled to the maximum degree.

Description

technical field [0001] The invention belongs to the field of electric vehicle control, and in particular relates to a braking control method of a dual-motor two-speed drive system. Background technique [0002] For congested urban traffic, the vehicle speed is not high and the vehicle often starts and stops repeatedly. The braking energy recovery system of electric vehicles is used to recover the braking energy originally consumed by friction and release it during the driving process, which can significantly reduce the power consumption of the power battery. power consumption, effectively improving the driving range of electric vehicles. [0003] The braking force required in the braking process of pure electric vehicles is composed of two parts: mechanical braking and motor braking. The existing braking energy recovery methods for pure electric vehicles generally use the reversibility of the motor to turn the motor under specific conditions. Transformed into a generator, a...

AI Technical Summary

Problems solved by technology

[0004] Existing pure electric vehicles are usually driven by a unipolar reduction device. There is no gearbox and only rely on a single-stage transmission gear to achieve deceleration and braking. In other words, it is difficult to optimize the working range of the motor so as to improve the efficiency of braking energy recovery; although the drive scheme of multi-speed transmissions such as 2-speed or 3-speed can well solve the above problems in electric vehicles, it will make the structure of the drive system complicated. The cost of automobiles increases, and it is difficult to balance reliability and economy

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