Abstract: A method and system for positioning a vehicle chassis in approximate alignment with a predetermined datum are provided. The vehicle includes a first longitudinal end adapted to be pivotally connected to a substantially fixed point and a second longitudinal end including at least one axle and an operatively associated two-corner fluid suspension system. According to the method, the fluid suspension system controls the alignment of the vehicle chassis to be aligned with an artificial horizon represented as the predetermined datum.

Abstract: A method and system for adjusting a relative leveled height of a sprung mass of a vehicle to an unsprung mass of the vehicle. The method also includes receiving an input from an operator for incrementally/decrementally changing the height of the sprung mass. A system for performing the method is also disclosed.

Abstract: A suspension system for use on a vehicle having two or more rear axles. The suspension system includes a plurality of gas springs and plurality of height sensors capable of outputting signals having a relation to distances between the respective ends of the respective first and second rear axles and the sprung mass of the vehicle. A control system adapted to selectively inflate or deflate respective ones of the plurality of gas springs to thereby adjust a leveled orientation of the sprung mass. The control system includes a controller that is adapted to determine a rear axle vertical offset and a rear axle articulation offset. The controller is adapted to determine whether conditions are appropriate for adjusting the suspension system by comparing the rear axle vertical offset and/or the rear axle articulation offset to a corresponding vertical offset threshold and/or an articulation offset threshold. A method is also included.

Abstract: A method of adjusting a leveled height of the sprung mass of a vehicle that is in approximate alignment with a predetermined datum is disclosed. The method includes approximately aligning the sprung mass with the predetermined datum, receiving an input from an operator for changing the height of the sprung mass and adjusting the height of the sprung mass while maintaining approximate alignment with the predetermined datum. A system for performing the method is also discussed.

Abstract: A method of determining appropriate conditions for leveling a vehicle having a height adjustable air suspension system. The method includes the steps of providing an acceleration-determining device adapted to output a signal associated with an acceleration of the vehicle. Another step includes measuring an acceleration value of the vehicle and comparing the acceleration value to a pre-determined signal. Yet another step includes determining whether appropriate conditions exist for leveling the vehicle based on the comparison. A system for performing the steps of the method is also included.