Appeal No. 1997-0558
Application 08/013,813
between a desired and a measured operating characteristic, and controls a variable gain amplifier to
output an actuator control signal to drive the actuator in response to the determined difference wherein
the gain is related to a "frequency of variations" of the difference.
Representative claim 1 is reproduced below:
1. An apparatus for controlling a vehicle suspension having a sprung mass and an unsprung
mass, said apparatus comprising:
a plurality of actuators, each corner of the vehicle having an associated actuator operatively
connecting the sprung mass with its associated unsprung mass;
means for sensing at least one operating characteristic of a selected corner;
means for providing a desired actuator drive signal in response to said at least one sensed
operating characteristic for achieving a desired operating characteristic for the selected corner;
means for determining the difference between said at least one sensed operating characteristic
and the desired operating characteristic for the selected corner;
control means responsive to said determined difference for providing an actuator control signal
having a value functionally related to said difference, said control means having a variable gain amplifier
means for outputting said actuator control signal, wherein the gain of said variable gain amplifier means
is controlled in response to a frequency of variations of said determined difference; and
actuator control means for driving said actuator in response to said actuator control signal.
The following references are relied on by the examiner:
Williams et al. (Williams) 4,625,993 Dec. 2, 1986
Doi et al. (Doi ‘650) 4,787,650 Nov. 29, 1988
Klinger et al. (Klinger) 4,809,179 Feb. 28, 1989
Doi et al. (Doi ‘632) 4,916,632 Apr. 10, 1990
Kurosawa 4,924,393 May 8, 1990
2
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