Appeal No. 1997-2478
Application 08/361,554
vehicle body and each of the vehicle wheels. With respect to
Figure 2, the control means includes an acceleration sensor 5
and a displacement sensor 4 for each wheel. Acceleration
sensor 5 generates an acceleration signal representative of
vertical acceleration of the vehicle and displacement sensor 4
generates a displacement signal representative of the relative
vertical displacement between the wheel and the vehicle body.
In addition, the signal representative of the relative
vertical displacement is directed to differentiator circuit 4a
to provide a value representative of vertical velocity. These
three signals are individually processed by dead band filters
F1, F2 and F3 and gain control circuits G1, G2 and G3. The
resulting signals Q1, Q2 and Q3 are added in adder circuit 14
to derive a signal Q representing the net amount of air to be
introduced into or withdrawn from the associated suspension
unit 1. Of particular interest to Hiwatashi is the provision
of variable width dead band filters at F1, F2 and F3, whose
width is set in accordance
8
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