Two control modes of the hottest trailer braking

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Two control modes of trailer braking

considering that Hengxu still invests in the research and development of new products, the new products developed this time can represent the new direction of the friction and wear testing machine to the reasons of braking effect and economic parts, it is proposed that the length of the two cracks can be added by control mode 1 and control mode 2 to compare the braking performance of the trailer. At this time, corresponding anti loosening measures must be taken to improve the dynamic performance. In order to control the braking force produced by the electromagnetic brake, controllers using these two control modes have been specially designed at home and abroad. The following are the working principles of the two control modes

1 inertia control mode

control mode l is inertia control. The braking force of the trailer brake is controlled by the deceleration feedback of the whole vehicle. The idea of this control mode is that the main vehicle will implement the braking action first, and the trailer will start the trailer's brake immediately after detecting the braking deceleration of the tractor through the deceleration sensor installed on the tractor. And the deceleration of the whole vehicle is fed back to the trailer to adjust the growth and change speed of the braking force of the trailer, so that the braking process of the whole vehicle can be coordinated and smooth from the surface, and the stability and safety of the braking process of the whole vehicle can be achieved mainly by changing the braking force growth control device of the trailer

2 hierarchical control mode

control mode 2 is hierarchical control. The braking force of the trailer is mainly selected according to the tonnage of the trailer. In this control mode, the braking force increases as a step. That is, the tonnage of the trailer is artificially divided into several stages. When the trailer pushes Haier New materials into the fields of electronics, automobile, construction and so on, when the vehicle meets this tonnage, the braking device of the trailer is started according to the device set in advance. When the delay time is over, the braking force immediately reaches the maximum value

the simulation results are analyzed as follows:

(1) under the inertia control mode, the growth of trailer braking force is relatively stable, and the effect is better than that under the hierarchical control mode

(2) under the hierarchical control mode, the braking deceleration of the trailer increases rapidly, but the growth process is not stable enough. Considering the characteristics of RV, the trailer has no passengers during driving, so the impact is slightly small

(3) after simulation, when the initial speed of the whole vehicle is about 721km/h, the braking distance of the hierarchical control mode is 5 ~ 6m smaller than that under the inertia control. Because the braking distance is a relatively important data for the braking performance of the vehicle, in this sense, the vehicle under the hierarchical control is better than the vehicle under the inertia control. However, considering the actual situation, the foreign speed limit of the trailer when driving on the highway is 65 km, so the requirements for the braking distance are not very high, so the braking distance need not be too strict when considering the braking performance of the whole vehicle. Due to the special parts of the trailer, avoiding impact is the main aspect we consider. Therefore, inertia control is better than hierarchical control, and the braking process is relatively soft

(4) under the inertia control mode, the force of the drawbar in the underwater direction is relatively small, and the direction does not change. Under the surface grading control mode, the force of the drawbar in the underwater direction has a sudden change, and the peak value is large, so the design requirements of the drawbar are high

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