Patent ID: 6637269
Filing Date: 2003-10-28
Classification: B60G,F16F,G01S

Abstract:
An air spring system for a motor vehicle, the air spring system comprising:a first connecting part defining a cover plate; a second connecting part defining a roll-off piston; said first and second connecting parts being disposed at a spacing from each other which rapidly changes with the movement of said motor vehicle over a road surface; a flexible member having a first end connected to said first connecting part and a second and connected to said second connecting part; an ultrasonic arrangement for making contactless measurements of the distance between said first and second connecting parts; said ultrasonic arrangement including an ultrasonic transmitter/receiver mounted on one of said connecting parts and a reflector mounted on the other one of said connecting parts; said reflector being configured as a two-step reflector having first and second steps; and, one of said steps being a target reflector and the other one of said steps being a reference reflector and both of said reflectors being at respective distances from said ultrasonic transmitter/receiver which likewise rapidly change as said spacing changes.