关键词: 重型卡车；驾驶室翻转电机；继电器故障

Abstract: Aiming at the problems of high failure rate and easy damage of relay in a heavy truck cab flip system, it is found that the root cause of the problem is the reverse voltage generated by the motor at the moment of starting or turning off, resulting in the arc erosion of relay contacts through circuit working principle analysis, fault reproduction and test verification. By analyzing and improving the circuit principle, adding protective diodes, realizing the suppression of the reverse voltage of the motor, and conducting tests and real vehicle verification, the relay ablation problem is solved, the failure rate of the flipping motor is reduced, and the reliability of the product is improved.

Key words: Heavy truck; Flip motor in cab; Relay failure