Patent ID: 9211776
Filing Date: 2015-12-15
Classification: B60G,F16F

Abstract:
1. An air spring arrangement comprising: a first mounting member, a second mounting member, an air spring volume, a height sensor, a controllable valve, a position controllable drive, wherein the position controllable drive is a stepper motor and the controllable valve is a stepper motor driven pneumatic valve, wherein the stepper motor is configured to be controlled with a controlling signal such that an opening grade of the stepper motor driven pneumatic valve can be determined based on the controlling signal, wherein the first mounting member and the second mounting member are arranged so as to mount the air spring volume to corresponding vehicle members, wherein the height sensor is arranged so as to sense a distance between the first mounting member and the second mounting member, wherein the controllable valve is arranged so as to connect the air spring volume with an environment outside of the air spring volume, wherein the position controllable drive is arranged so as to drive the controllable valve ( wherein the controllable valve in combination with the position controllable drive has a self-holding characteristic, such that in case of absence of power the controllable valve maintains any opening grade adjusted before the absence of power, and wherein the position controllable drive is controlled based on the sensed distance (d) between the first mounting member and the second mounting member.