Electro-hydraulic composite braking ABS control system and method based on hub motor

Abstract

The invention relates to an electro-hydraulic composite braking ABS control system based on a hub motor, which comprises a braking pedal, an ABS controller, and a hydraulic braking module, a motor braking module and a braking pedal sensor electrically connected with the ABS controller. The motor braking module comprises hub motors arranged on each wheel and a motor control module electrically connected with each hub motor, and is characterized in that the motor control module is in communication connection with the ABS controller through a CAN bus and is used for transmitting wheel speed signals of each wheel to the ABS controller. According to the electro-hydraulic braking ABS control system based on the hub motor, the wheel speed signals can still be obtained without mounting a wheel speed sensor and a wheel speed detection circuit on each wheel, so that the number of parts are reduced, reliability and safety are improved, and an arrangement of the hub motor is facilitated. In addition, the invention further provides an electro-hydraulic composite braking ABS control method based on the hub motor.

Description

technical field [0001] The invention relates to the technical field of automotive electronic control, in particular to an ABS control system and method based on electro-hydraulic composite braking of in-wheel motors. Background technique [0002] The anti-lock braking system (Antilock Brake System, ABS for short) is a safety device widely used in modern automobiles to prevent tires from locking up when braking during driving. When braking suddenly or when driving on a vicious road, the tires are locked, not only will the vehicle lose control, but the braking distance will also be lengthened. The ABS control system is a preventive safety device that prevents tire lock-up in advance, maintains the best braking force, and reduces the risk of accidents. [0003] The working principle of the traditional hydraulic braking ABS control system: During the braking process of the car, the wheel speed is detected by the wheel speed sensor installed on each wheel and the corresponding w...

AI Technical Summary

Problems solved by technology

[0005] Hydraulic braking can obtain sufficient braking force at any vehicle speed, but the braking force cannot be precisely controlled, and there is a long delay in response; while electric braking provides small braking force, but it responds quickly and It can be precisely controlled; therefore, at present, on electric vehicles driven by hub motors, the ABS control system of electro-hydraulic composite braking is generally used, which combines hydraulic braking and motor braking, and makes full use of the good advantages of hydraulic braking and motor braking. complementarity

[0006] However, the current electro-hydraulic brake ABS control system has the following technical problems: it is necessary to install a wheel speed sensor on each wheel and set up a corresponding wheel speed detection circuit to detect the wheel speed of each wheel, and the wheel speed sensor is generally composed of a ring gear, Magnetic coils, coils, wires, sockets, housings and many other parts, the weight and volume of these parts increase the weight and volume of the hub bearing unit products; in addition, the ring gear and housing installed on the flange journal of the hub bearing unit The radial gap between the inner magnetic ring and the coil is very small. Due to the manufacturing and assembly errors of some parts, the ring gear may scratch between the magnetic ring and the coil during rotation, resulting in The failure of the wheel speed sensor leads to the failure of the ABS system, which has certain safety hazards; in addition, most of the outer covers are assembled on the outer end of the hub motor product, so it brings inconvenience to the arrangement of the hub motor on the wheel

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