Active suspension apparatus
First Claim
1. An active suspension apparatus incorporating a hydropneumatic spring for suspending a vehicle body on wheels by using a hydropneumatic pressure, comprising:
- displacement detecting means for detecting a relative displacement (x) between an axle and the vehicle body;
discriminating means for discriminating a travel road surface state in accordance with a sum (Ax +Bx) of a signal obtained by multiplying the relative displacement (x) with a first coefficient and a signal obtained by multiplying a change rate (x) in unit time of the relative displacement with a second coefficient, the first and second coefficients being determined in accordance with riding comfort against vibrations;
hydropneumatic suspension means having hydropneumatic springs with hydropneumatic chambers, actuators, and throttle valves respectively disposed between said hydropneumatic chambers and said actuators; and
driving means for controlling opening area of said throttle valves in accordance with a road surface state signal supplied from said discriminating means,whereby characteristics of a damping force are controlled in accordance with the road surface state signal.
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Accused Products
Abstract
An active suspension apparatus detects a relative displacement (x) between an axle and a vehicle body, discriminates a road surface state in accordance with the relative displacement and a change rate (x) in unit time which is derived from the relative displacement (x), and optimally controls characteristics of damping forces of hydropneumatic suspensions in accordance with a discrimination result (i.e., a road surface state). This discrimination is performed in accordance with a sum (Ax+Bx) of a signal obtained by multiplying the relative displacement (x) with a predetermined coefficient and a signal obtained by multiplying the change rate (x) with another predetermined coefficient. These coefficients are obtained in accordance with riding comfort against vibrations. The characteristics of the damping force of the hydropneumatic suspension are controlled by controlling the opening of throttle valves disposed between hydropneumatic chambers and actuators.
41 Citations
10 Claims
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1. An active suspension apparatus incorporating a hydropneumatic spring for suspending a vehicle body on wheels by using a hydropneumatic pressure, comprising:
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displacement detecting means for detecting a relative displacement (x) between an axle and the vehicle body; discriminating means for discriminating a travel road surface state in accordance with a sum (Ax +Bx) of a signal obtained by multiplying the relative displacement (x) with a first coefficient and a signal obtained by multiplying a change rate (x) in unit time of the relative displacement with a second coefficient, the first and second coefficients being determined in accordance with riding comfort against vibrations; hydropneumatic suspension means having hydropneumatic springs with hydropneumatic chambers, actuators, and throttle valves respectively disposed between said hydropneumatic chambers and said actuators; and driving means for controlling opening area of said throttle valves in accordance with a road surface state signal supplied from said discriminating means, whereby characteristics of a damping force are controlled in accordance with the road surface state signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification