Automotive vehicle suspension control system
First Claim
1. A suspension control system for an automotive vehicle, comprising:
- at least one shock absorber provided between sprung and unsprung masses of the vehicle to provide a variable damping force characteristic;
first sensor means for sensing a behavior of the vehicle and producing a first sensor signal indicative of a sensed vehicle behavior;
second sensor means for sensing a vehicle steering angle and producing a second sensor signal indicative of a sensed vehicle steering angle;
a low pass filter for converting the second sensor signal into a noise removed steering angle indicative signal;
a control unit operable in a normal control mode for controlling the shock absorber based on the first sensor signal to provide an optimum damping force characteristic and in a roll control mode for controlling the shock absorber based on the noise removed vehicle steering angle indicative signal to provide a damping force greater than that provided in the normal control mode, the control unit including means for detecting a peak value of the noise removed steering angle indicative signal, means for operating the control unit in the roll control mode when the noise removed steering angle indicative signal exceeds a predetermined first threshold value, means for setting a second threshold value in direct proportion with the detected peak value, and means for making a change from the roll control mode to the normal control mode a predetermined time after the noise removed steering angle indicative signal decreases below the second threshold value.
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Accused Products
Abstract
A suspension control system for controlling at least one shock absorber provided between sprung and unsprung masses of an automotive vehicle to provide a variable damping force characteristic. The control system includes a low pass filter for filtering out noise superimposed on an electric signal indicative of a sensed steering angle. The noise removed steering angle indicative signal is fed to a control unit operable in a normal control mode for controlling the shock absorber based on a sensed vehicle behavior to provide an optimum damping force characteristic and in a roll control mode for controlling the shock absorber based on the noise removed vehicle steering angle indicative signal to provide a damping force greater than that provided in the normal control mode. The control unit operates in the roll control mode when the noise removed steering angle indicative signal exceeds a predetermined first threshold value. The operation is changed from the roll control mode to the normal control mode a predetermined time after the noise removed steering angle indicative signal decreases below a second threshold value set in direct proportion with a peak value of the noise removed steering angle indicative signal.
19 Citations
2 Claims
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1. A suspension control system for an automotive vehicle, comprising:
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at least one shock absorber provided between sprung and unsprung masses of the vehicle to provide a variable damping force characteristic; first sensor means for sensing a behavior of the vehicle and producing a first sensor signal indicative of a sensed vehicle behavior; second sensor means for sensing a vehicle steering angle and producing a second sensor signal indicative of a sensed vehicle steering angle; a low pass filter for converting the second sensor signal into a noise removed steering angle indicative signal; a control unit operable in a normal control mode for controlling the shock absorber based on the first sensor signal to provide an optimum damping force characteristic and in a roll control mode for controlling the shock absorber based on the noise removed vehicle steering angle indicative signal to provide a damping force greater than that provided in the normal control mode, the control unit including means for detecting a peak value of the noise removed steering angle indicative signal, means for operating the control unit in the roll control mode when the noise removed steering angle indicative signal exceeds a predetermined first threshold value, means for setting a second threshold value in direct proportion with the detected peak value, and means for making a change from the roll control mode to the normal control mode a predetermined time after the noise removed steering angle indicative signal decreases below the second threshold value. - View Dependent Claims (2)
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Specification