Technology for measuring and diagnosing the damping force of shock absorbers and the constant of coil springs when mounted on a vehicle

Abstract Diagnosis of the individual function of shock absorbers and coil springs has been simplified by an off-the-car-type tester. We studied methods of analyzing coil springs and shock absorbers independently without removing them from the vehicle. The damping force of the shock absorber itself, excluding the spring effect, can be indicated according to the axle weight/road wheel at the point of displacement 0.