Frequency shaping method for minimizing impact harshness of suspension system
First Claim
1. A system for actively controlling the motion of an unsprung mass relative to a sprung mass comprising:
- a motion sensor for measuring the motion of the unsprung mass relative to the sprung mass, said motion sensor operable to generate a signal of this motion;
a frequency shaping network receiving the signal from the motion sensor, said frequency shaping network analyzing the signal in view of its phase and amplitude components and altering the phase and amplitude components based upon a predetermined response algorithm, said frequency shaping network further outputting a signal indicative of a shaped frequency signal; and
an actively controlled actuator receiving the signal from the frequency shaping network, wherein the actuator controls the movement of the unsprung mass based upon the shaped signal from the frequency shaping network.
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Abstract
An active suspension system is disclosed for a motorized vehicle and the like. Generally these types of active suspension systems have an impact harshness to sharp road irregularities higher than that of passive suspension systems. This invention incorporates a frequency response shaping network (42) which alters the frequency signal from a hub sensor (36) by analyzing the frequency signal in view of its components of magnitude and phase, and shaping these components into a desired form. The modified or shaped signals are then applied to the basic control laws of the vehicle dynamics to modify the damping signal applied to an active actuator (38) in such a way that the actuator (38) applies the appropriate damping to the vehicles wheels (32) with greatly reduced harshness.
21 Citations
17 Claims
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1. A system for actively controlling the motion of an unsprung mass relative to a sprung mass comprising:
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a motion sensor for measuring the motion of the unsprung mass relative to the sprung mass, said motion sensor operable to generate a signal of this motion; a frequency shaping network receiving the signal from the motion sensor, said frequency shaping network analyzing the signal in view of its phase and amplitude components and altering the phase and amplitude components based upon a predetermined response algorithm, said frequency shaping network further outputting a signal indicative of a shaped frequency signal; and an actively controlled actuator receiving the signal from the frequency shaping network, wherein the actuator controls the movement of the unsprung mass based upon the shaped signal from the frequency shaping network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of actively controlling an unsprung mass relative to a sprung mass comprising the steps of:
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sensing the motion of the unsprung mass and providing a frequency signal indicative of the motion; generating a shaped frequency signal in a frequency shaping network based on the motion of the unsprung mass, wherein the frequency shaping network analyzes the frequency signal in view of its phase and amplitude components and shapes the phase and amplitude components based upon a predetermined response algorithm; and applying the shaped frequency signal to an actuator for actively controlling the motion of the unsprung mass based upon the shaped signal, a frequency shaping network receiving the signal from the motion sensor, said frequency shaping network analyzing the signal in view of its phase and amplitude components and altering the phase and amplitude components based upon a predetermined response algorithm, said frequency shaping network further outputting a signal indicative of a shaped frequency signal; and an actively controlled actuator receiving the signal from the frequency shaping network, wherein the actuator controls the movement of the unsprung mass based upon the shaped signal from the frequency shaping network. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of actively controlling a suspension system of a vehicle comprising the steps of:
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sensing the motion of a wheel of the vehicle and providing a frequency signal indicative of this motion; shaping the frequency signal in a frequency shaping network wherein the frequency shaping network separates the frequency signal into its phase and amplitude components and shapes the phase and amplitude components based upon a predetermined response algorithm in order to generate a shaped frequency signal; and applying the shaped frequency signal to an actuator operable to actively control the motion of the wheel. - View Dependent Claims (15, 16, 17)
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Specification