Patent ID: 7959137
Filing Date: 2011-06-14
Classification: B60G,F16F,G01S

Abstract:
1. A distance indicating system including an associated air spring used on an associated vehicle, the associated air spring including first and second support members adapted to move relative to one another in response to a load applied to the associated air spring, said distance indicating system comprising: a transceiver associated with said first support member, said transceiver configured to broadcast an electromagnetic wave; and, a transponder associated with said second support member, said transponder spaced a distance from said transceiver and within the broadcasting range of said electromagnetic wave, said transponder configured to receive said electromagnetic wave, and said transponder configured to short circuit an associated antenna for a predetermined period, said associated antenna inducing an amplitude variation of said electromagnetic wave broadcasted by said transceiver, said amplitude variation increasing as the distance from said first support member to said second support member decreases; wherein said distance indicating system is configured to detect and measure the amplitude variation of said broadcasted electromagnetic wave, and correlate specific amplitude variations with respective distances from said first support member to said second support member.