Patent ID: 7222867
Filing Date: 2007-05-29
Classification: B60G,B62D

Abstract:
1. A positioning system for a lift axle for wheeled vehicles, the positioning system comprising: an air spring suspension system including a plurality of air springs for supporting a wheeled vehicle chassis from a plurality of axles including the lift axle; an air spring inflation system including a primary air tank; load sensors communicating with the plurality of air springs; a vehicle speed sensor; a transmission controller for reporting a selected transmission gear; an accelerator pedal position sensor; a park brake position sensor; a primary air tank pressure sensor communicating with the primary air tank; an ignition switch position sensor; lift axle positioning means; an electrical system controller connected to collect outputs of the load sensors, the vehicle speed sensor, the accelerator pedal position sensor, the transmission controller the primary air tank pressure sensor, the park brake position sensor and the ignition switch position sensor; and the electrical system controller being programmed to issue instructions to the lift axle means responsive to the values of the load sensors, the vehicle speed sensor, the transmission controller, the park brake position sensor and the ignition switch position sensor.