SIGNAL GENERATING DEVICE IN VEHICLE

PURPOSE: To attain optimization of a control mode in a shock absorber, by performing variable control of a vehicle logically combining a relative motion and its acceleration signal of a car body and a wheel to control a shock absorber. CONSTITUTION: Signal paths 14, 15 guiding compression/traction step request of a shock absorber 20 as information from essential sky hook adjustment in a means 18 are connected to a signal path 16 to the sock absorber 20 through a controllable switch 11. Spring displacement or a speed signal Xar' of a piston of the shock absorber 20 is obtained by a means 19, this speed signal and an acceleration signal Xar" obtained in a first means 12 are input to a second means 13. Further, a signal from a means 17 based on dynamic characteristics or the like of the shock absorber 20 are input to the second means 13, the signals Xar', Xar" are logically combined, and a signal controlling the switch 11 is output. Accordingly, a switching noise of characteristic change can be reduced by optimizing a control mode of the shock absorber 20.