| 摘要 |
PCT No. PCT/NL94/00040 Sec. 371 Date Aug. 16, 1995 Sec. 102(e) Date Aug. 16, 1995 PCT Filed Feb. 17, 1994 PCT Pub. No. WO94/19206 PCT Pub. Date Sep. 1, 1994The invention relates to an electric circuit for measuring the length of a shock absorber unit of a vehicle, comprising: a coil with windings which are fitted around the shock absorber unit, of which a casing of electrically conducting material connected to a part of the wheel suspension of the vehicle is axially movable relative to the coil when there is a change of length of the shock absorber unit as a result of a change in the force absorbed by the wheel suspension; an oscillator connected to the coil, for exciting the coil with an excitation signal of a predetermined frequency; and processing means which are connected to the coil and are designed for determining the value of a relation between the voltage across the coil and the current through the coil, which value is a measure of the length of the shock absorber unit. In this connection, the length of a shock absorber unit should be understood as the distance between two fixing points thereof in the wheel suspension, while the wheel suspension of the vehicle should be understood as the damped spring construction which couples a wheel in a supporting manner to the body. In this case, the casing of the shock absorber unit can be connected to the body and the coil to the wheel, or the casing can be connected to the wheel and the coil to the body. The term vehicle should be understood not only as a road vehicle such as a lorry or private car, but also as a rail vehicle or an aircraft on the ground.
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