Controller and control method of eddy-current retarder of combined braking system

Abstract

The invention provides a controller and control method of an eddy-current retarder of a combined braking system, relating to automobile eddy-current retarders. The controller comprises a minicomputer, a high-power transistor driving circuit, a braking pedal positioning sensor, a current feedback circuit and an eddy-current retarder combined switch. After a braking pedal is pedaled down, the controller switches off a gear grading control, calculates the size of an automobile real-time braking force and then calculates the gradient of the automobile according to a PWM (Pulse Width Modulation) control signal of the eddy-current retarder, the input of the braking pedal position sensor and the variation of the speed pulse of the automobile, then inquires a proportion of the automobile downslope braking force shared by the eddy-current retarder, which corresponds to the gradient and is prestored in an internal memory, applies a PWM control signal with corresponding duty ratio to an electromagnetic coil of the eddy-current retarder, outputs a certain braking torque, ensures that the eddy-current fully exerts the auxiliary braking effect on different slopes while satisfying normal operation conditions and simultaneously lightens the operation intensity of a driver.

Description

technical field [0001] The invention relates to an automotive electronic control product, which is suitable for the control of the eddy current retarder in the combined braking system composed of the main brake and the eddy current retarder in the transport vehicle. Background technique [0002] According to the requirements of regulations, large and medium-sized operating vehicles must be equipped with auxiliary braking devices to consume the braking load of the vehicle during small and medium braking, and reduce the thermal load and contact wear of the main braking device of the vehicle. At the same time, during the continuous braking process of the car down a long slope, the auxiliary braking device can participate in the braking effect to ensure the braking efficiency of the main braking device in the case of emergency braking. The eddy current retarder is a commonly used auxiliary braking device, but its braking power is relatively small. Therefore, a reasonable and ful...

AI Technical Summary

Problems solved by technology

This kind of controller has changed the controller type in the traditional sense, which is beneficial to the space layout and the design of different models, but the operation is more troublesome, and the braking load is shared according to a fixed ratio, and the continuous working time of the main brake of the car will be longer. It is difficult to achieve the purpose of reducing the contact wear of the main brake and reducing the working temperature of the contact parts as much as possible

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