Method for controlling anti-lock system of four-hub-motor drive electric car free of hydraulic braking

Abstract

The invention discloses a method for controlling an anti-lock system of a four-hub-motor drive electric car free of hydraulic braking, and relates to the field of automotive electronic control. In each control stage, braking force distribution of a front axle and a rear axle of a vehicle and reverse braking, regenerative braking, reverse-regenerative coordinating braking and forward driving of an in-wheel-motor are related. A logic threshold control method is adopted in ABS control, the slip rate (S) is compared with a set threshold value, the value and the direction of input voltage of the motor are controlled so that the forward driving, the reverse braking and the regenerative braking of the motor can be achieved, and accordingly wheel lock is prevented. The slip rate of a wheel is controlled near a theoretical value, the ground attachment coefficient is utilized to the maximum extent, and safe braking is achieved.

Description

technical field [0001] The invention relates to the field of automotive electronic control, in particular to a control method for an anti-lock braking system (ABS) of an electric vehicle. Background technique [0002] With the development of society, the reduction of petroleum and fossil energy and the increasingly serious environmental pollution problems, various pure electric vehicles driven by motors have come out one after another. Among them, electric vehicles driven by hub motors are the main direction of future electric vehicle development. Compared with traditional cars, electric vehicles driven by four-wheel hub motors remove the heavy engine and gearbox, and the vehicle is light in weight and simple in structure. While solving energy and environmental problems, the braking safety of vehicles is also particularly important. Automobile anti-lock braking system (ABS) can prevent the phenomenon of wheel lock, tail flicking, sideslip and so on during the braking proces...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this control method is that the mechanical impact is large and the brake has no buffer.

And also need to add an additional control motor

In this way, a mechanical brake device will be added on the basis of a pure electric vehicle, which will increase the weight of the body and reduce the flexibility of the vehicle, which is contrary to the original intention of the electric vehicle design.

In addition, mechanical braking has a greater impact and wear on the mechanical parts of the car's braking mechanism (such as brake pads, etc.), resulting in the deterioration of the car's braking performance after a certain period of time, making the car unable to achieve the ideal braking effect, thus Cause certain harm to the safe driving of the car

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