Shock absorber control apparatus
First Claim
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1. A shock absorber control apparatus for controlling a damping force of a shock absorber provided at a vehicle, comprising:
- detecting means for detecting a running condition of said vehicle, wherein said running condition is detected based upon data derived from a sensor for detecting a steering angle of said vehicle, a sensor for detecting a speed of said vehicle, a sensor for detecting a vertical acceleration of said vehicle, a sensor for detecting whether or not braking operation is carried out for said vehicle, and a sensor for detecting an opening speed of a throttle of said vehicle;
means for estimating a value of a fuzzy variable on the basis of the running condition detected by said detecting means;
fuzzy inference means for performing a fuzzy inference corresponding to a fuzzy rule between a membership function of said fuzzy variable and a membership function using the damping force as the fuzzy variable, thereby deciding the damping force of said shock absorber; and
means for controlling the damping force of said shock absorber corresponding to the damping force decided by said fuzzy inference means, said damping force being decided by a center of gravity of a logical sum of said membership functions.
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Abstract
A shock absorber control apparatus which performs a fuzzy inference by use of a predetermined fuzzy rule regarding comfortable ride, steering stability and grounding efficiency corresponding to a detected running condition of a vehicle, thereby setting an optimum damping force. A shock absorber control apparatus which fetches a plurality of specified frequency components from a vertical acceleration signal of a vehicle body so as to perform a fuzzy inference by use of a fuzzy rule corresponding to a quantity of each frequency component, thereby setting an optimum damping force.
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Citations
16 Claims
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1. A shock absorber control apparatus for controlling a damping force of a shock absorber provided at a vehicle, comprising:
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detecting means for detecting a running condition of said vehicle, wherein said running condition is detected based upon data derived from a sensor for detecting a steering angle of said vehicle, a sensor for detecting a speed of said vehicle, a sensor for detecting a vertical acceleration of said vehicle, a sensor for detecting whether or not braking operation is carried out for said vehicle, and a sensor for detecting an opening speed of a throttle of said vehicle; means for estimating a value of a fuzzy variable on the basis of the running condition detected by said detecting means; fuzzy inference means for performing a fuzzy inference corresponding to a fuzzy rule between a membership function of said fuzzy variable and a membership function using the damping force as the fuzzy variable, thereby deciding the damping force of said shock absorber; and means for controlling the damping force of said shock absorber corresponding to the damping force decided by said fuzzy inference means, said damping force being decided by a center of gravity of a logical sum of said membership functions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A shock absorber control apparatus for controlling a damping force of a shock absorber provided between each wheel and a body of a vehicle, comprising:
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an acceleration sensor for detecting a vertical acceleration of said body; a plurality of filters for passing different specified frequency components of the output of said acceleration sensor respectively; fuzzy inference means for deciding the damping force of said shock absorber by performing a fuzzy inference on the basis of the output of each of said filters; and means for controlling the damping force of said shock absorber corresponding to the damping force decided by said fuzzy inference means. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification