| 摘要 |
An electropneumatic subsystem of a vehicle compressed air braking system controls communication within the trailer control line, the trailer supply line, and the tractor spring brake delivery line. A valve operated by pilot pressure is installed in the trailer control line, and responds to the pressure level in the trailer supply line to open or close the trailer control line in accordance therewith, thereby providing a tractor protection function. A solenoid valve in the trailer supply line is actuated by an electronic control unit to open and close the trailer supply line to thereby perform a trailer spring brake control function and tractor protection function. |
