New energy automobile motor braking system

Abstract

The invention discloses a new energy automobile motor braking system. The system comprises constraint conditions such as sliding working condition judgment, sliding deceleration calculation, sliding braking force distribution, front motor sliding regenerative braking force, rear motor sliding regenerative braking force, target automobile hydraulic braking characteristics, rear motor analysis force, I curve limitation, a motor, a battery and automobile speed. According to an ABS coordination strategy, a fault processing mechanism, a front axle motor controller and a rear axle motor controller, when a driver loosens an accelerator pedal and detects that the vehicle speed is reduced, the working condition of the driver is judged, sliding deceleration is calculated, and therefore regenerative braking force distribution is conducted on a front motor and a rear motor through a sliding braking force distribution module; when a driver steps on a brake pedal, the rear axle motor actively compensates the equivalent brake deceleration of the rear axle brake according to the brake strength, and the equivalent brake deceleration is converted into the motor torque according to the vehicle information, so braking of the front axle motor and the rear axle motor is finally completed.

Description

technical field [0001] The invention relates to the technical field of a motor brake system of a new energy vehicle, in particular to a motor brake system of a new energy vehicle. Background technique [0002] The energy crisis and environmental pollution have made it necessary to vigorously develop electric vehicles driven by electric energy, and distributed drive electric vehicles have incomparable advantages of centralized drive systems in terms of power, economy and handling stability. Electric vehicles can rely on the composite braking system for braking energy recovery. When battery technology cannot make breakthroughs, energy recovery is an important way to increase the driving range of vehicles. [0003] Compound braking strategy is divided into parallel type and series type according to different braking systems: parallel type means that the motor braking force is directly superimposed on the hydraulic braking force in proportion, which is suitable for traditional b...

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Problems solved by technology

[0003] Compound braking strategy can be divided into parallel type and series type according to different braking systems: parallel type means that the braking force of the motor is directly superimposed on the hydraulic braking force in proportion, which is suitable for traditional braking systems. It is easy to implement and low in cost, but the energy The recovery rate is low; the tandem strategy relies on the decoupling of the brake pedal and the brake fluid pressure, and can give priority to using the motor force for braking, and the energy recovery rate is high, but the braking system needs to be redesigned, which is costly

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