An electromagnetic brake high-precision control system and control method for a caravan

Abstract

The invention discloses an electromagnetic brake high-precision control system and method for a motor home. The system comprises the motor home, a traction vehicle, a detecting mechanism, an executor,a power supply, a PWM controller, coils and an ECU. The detecting mechanism comprises a braking pedal stroke sensor, a load sensor and an acceleration sensor, wherein the executor comprises controllable switches a, b and c, and the system sets three coils r1, r2 and r3 having different resistance values and correspondingly connected with the controllable switches. When the motor home is braked, on and off of the controllable switches and the duty ratios output by a PWM are judged according to signals detected by the detecting mechanism, and accordingly the coils having different resistance values are connected and corresponding equivalent voltages are produced. When light load, half load or full load of the motor room are detected, the coils r1, r2 and r3 are respectively connected, and the PWM outputs corresponding duty ratios. The electromagnetic brake high-precision control system and method can improve the effective values of the PWM and braking force control precision and can also improve the error-tolerant rates of the coil parts of a braking system.

Description

technical field [0001] The invention relates to the technical field of brake control of a trailer-type caravan, in particular to a high-precision control system for an electromagnetic brake used in a caravan and a control method thereof. Background technique [0002] The performance of the vehicle braking system is directly related to personal safety. Both domestic and foreign car companies and scientific research departments attach great importance to the research and development of new vehicle braking systems. Electromagnetic brakes are a new type of brakes, and most of them have been used in the brakes of trailers, especially towed RVs. Compared with the traditional hydraulic brake, the electromagnetic brake has its outstanding advantages. The cable replaces the pipeline, improves the sensitivity of the brake, has high reliability, and is easy to install; secondly, the controller is easy to design, which represents the development trend of the brake. In order to realize t...

AI Technical Summary

Problems solved by technology

That is to say, when the RV brakes with light load or half load, the effective value of PWM output is low, and the braking force control accuracy is also low.

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