Abstract: For the traditional domestic tractor air brake system, the main trailer service brake control is incompatible; the function does not meet the requirements of EU regulations, such as long braking response time, the driver cannot brake the trailer when the control pipeline is broken, and there is no main trailer at the same time. Parking brake function, etc. Through a lot of research and analysis on the air brake system at home and abroad, the final scheme adopts the hydraulic control air brake valve to realize the compatibility of the main trailer service brake control, and can shorten the braking response time; the solenoid valve is used to realize the simultaneous parking of the main trailer; The trailer control valve with aircontrolled air is used to realize the automatic braking function. The dualpipe air brake system developed and designed has passed the installation test. The pressure value at the handshake joint is above 650 kPa during braking, and the response time is within 0.4 s; the pipeline ruptures and the driver depresses the brake pedal to achieve automatic trailer braking within 2 s. (BrakeAway) function; pull the main driver's handbrake and the trailer parking brake activates at the same time. The design scheme greatly improves the braking effect and safety of the air brake system of the tractortrailer.

Key words: tractor, dualline air brake system, hydraulic air valve, automatic brake, trailer parking brake

摘要： 针对国内传统拖拉机气制动系统主挂行车制动控制上不兼容，制动响应时间、自动制动功能、主挂同时驻车制动功能等不符合欧盟法规要求，研究一种新的双管路气制动系统。此系统采用液控气制动阀实现主挂行车制动控制兼容，并可缩短制动响应时间；采用气控气的挂车控制阀实现自动制动功能；采用电磁阀实现主挂同时驻车制动。通过装机测试结果发现，制动时握手接头处压力值在650 kPa以上，响应时间在0.4 s以内；管路破裂时驾驶员踩下制动踏板2 s内实现挂车自动制动(BrakeAway)功能；拉起主车驻车制动，挂车驻车制动同时激活。该套设计方案极大地提高了拖拉机挂车气制动系统的制动效果和安全性。

关键词: 拖拉机, 双管路气制动系统, 液控气阀, 自动刹车, 挂车驻车制动