Automatic air bag controller

摘要

A system for automatically operating a dump valve regulating inflation of pneumatic suspension members of a trailer suspension. The novel system adjusts pneumatic pressure of rear axle suspension members of a loaded trailer to facilitate maneuvering the rig at low speeds. The novel system is responsive to selection of low side transmission gears, as detected by monitoring pressure of the shifter pneumatic system, and to operation of a turn signal. When both a turn signal is detected, and when a low side gear is selected, thus assuring that the rig is operating at a low road speed, the dump valve vents pressure from selected pneumatic suspension members, An adjustable time delay feature causes the pneumatic system to be repressurized by deactivating the dump valve after a predetermined time period elapses, Apparatus monitoring steering linkage detects maneuvering, which activates the system when a low side gear is engaged even if the rig operator has neglected to operate the turn signals.