Patent ID: 6224044
Filing Date: 2001-05-01
Classification: B60G

Abstract:
A level control system for a motor vehicle, the system comprising:a plurality of air springs;a plurality of controllable first valves connected to corresponding ones of said air springs for filling and venting the respective air springs;a controllable second valve switchable to connect said air springs to the atmosphere for venting said air springs;a first control unit for controlling said controllable first and second valves to fill or vent said air springs;a second control unit for controlling said controllable first and second valves to fill or vent said air springs;said first control unit having means for transmitting check signals to said second control unit at respective time intervals; and,said second control unit having checking means for checking whether said second control unit receives each of said check signals from said first control unit and, when one of said signals expected from said first control unit is not received, said second control unit functioning to assume control of said controllable first and second valves so as to drive said first and second valves to bring said motor vehicle into a dynamically safe driving condition.