Patent ID: 7950674

Claim:
An air suspension system comprising: a plurality of air spring assemblies, each air spring assembly including a piston airbag and a primary air bag mounted adjacent to the piston airbag with each air spring assembly being set at an initial ride height; a plurality of valve assemblies, with at least one valve assembly being associated with each of said primary and said piston airbags; and a controller that identifies flow restriction differences for said primary and said piston airbags and subsequently determines a resultant vehicle rate of height change based on identified flow restriction differences, and wherein said controller is configured to adjust and maintain a desired ride height and spring rate wherein said controller actively varies pressure within said primary and said piston airbags to achieve the desired ride height and spring rate by varying flow rates into and out of said primary and said piston airbags via associated valve assemblies based on the resultant vehicle rate of height change.