In order to improve the shift quality of automatic transmission with synchroniser, a synchroniser electrohydraulic control system equipped with the proportional pressure reducing valves is proposed. The principle of the control system is introduced in detail. The PID controller is used to realise closed-loop control of shift displacement to achieve the synchronisation. A numerical model and a test apparatus have built up to validated the control performance. The simulated and measured engagement and disengagement of the synchroniser with the proposed control system are investigated in detail. The results indicate that the shift displacement is controllable by changing the cylinder chamber pressure. The back pressure value is useful for a smooth synchroniser operation. It is determined by the sleeve motion and the throttle parameter. The back pressure affects little on the synchronisation stage during the engagement process. The proposed method can be used for the optimising design of the electrohydraulic system for the synchroniser control.

为了提高带有同步器的自动变速器的换档质量，提出了一种配备比例减压阀的同步器电液控制系统。详细介绍了控制系统的原理。PID控制器用于实现换挡的闭环控制，以实现同步。建立了数值模型和测试设备以验证控制性能。详细研究了同步器与所提出的控制系统的仿真和实测啮合和脱离。结果表明，通过改变气缸室压力可以控制变速位移。背压值对于平稳的同步器操作很有用。它由轴套运动和节气门参数确定。在接合过程中，背压对同步阶段的影响很小。所提出的方法可用于电液系统的同步器控制的优化设计。