Servo-control system for the steerable front wheels of a vehicle

Claim 1

In a servo-control system for the steerable front wheels or nose gear of a vehicle, at least a lower part of which having at least one wheel that may rotate about its longitudinal axis comprising: means for generating an electric command representative of a desired orientation for said lower part of said nose gear; actuation means for causing rotation of said lower part of said nose gear; control means for controlling said actuation means; means for detecting the real orientation of said lower part of said nose gear and for generating an electric signal representative of said real orientation; and means for subtracting said electric signal from said command and applying the difference obtained to said control means; said control means having a high pass filter which receives an input signal containing information of the oscillations to which said lower part of said nose gear is subjected and whose output is connected to a device for subtracting the output signal of said high pass filter from the difference between said command and said signal representative of the real orientation; and the pass band of said high pass filter covering the natural oscillation frequency of said lower part of the gear about its longitudinal axis; whereby the steerable front wheels or nose gear is rotated about its longitudinal axis.