초록 ▼

The relative motion and force between two interconnected elements can be controlled by a semi-active two-stage adjustable damper to maximize isolation between the elements, while minimizing the instances of the motion exceeding acceptable limits. An algorithm determines when to apply the high force

The relative motion and force between two interconnected elements can be controlled by a semi-active two-stage adjustable damper to maximize isolation between the elements, while minimizing the instances of the motion exceeding acceptable limits. An algorithm determines when to apply the high force state of the damper to provide excellent isolation from input vibration and shocks. The dampers and control algorithms are useful in primary vehicle suspension systems, cab mounts, seat mounts and engine mounts.

대표청구항 ▼

[ What is claimed is:] [1.] A method for controlling the relative motion between two elements movably interconnected through a linkage which includes a spring assembly which tends to maintain the elements at an equilibrium position, at least the first element thereof being subjected to externally ge

[ What is claimed is:] [1.] A method for controlling the relative motion between two elements movably interconnected through a linkage which includes a spring assembly which tends to maintain the elements at an equilibrium position, at least the first element thereof being subjected to externally generated motion inputs and tending to transmit a first force in response thereto to the second element thereof; the extreme limits of acceptable displacement of said elements being between of x.sub.+limit in a positively defined direction and x.sub.-limit in a negatively fined direction; said elements being provided with a means for applying a second force therebetween, opposed to the direction of the relative motion of the elements, which means can be switched between a state characterized by a high force and a state characterized by a low force, the difference between said high force and said low force being defined as the controlled force; said method comprising:(a) measuring the displacement x.sub.rel of the second element relative to the first element, x.sub.rel being defined as zero at the equilibrium position;(b) determining the relative velocity v.sub.rel of the two elements; and(c) applying the high force between the first and second elements if ]EQU11 ] otherwise applying the low force; where:v.sub.db is a velocity deadband with a preselected value greater than or equal to zero,m is the effective mass of the second element,d is the distance from the displacement x.sub.rel to the acceptable extreme displacement limit x.sub.+limit or x.sub.-limit in the direction of the relative velocity v.sub.rel,F.sub.sys is the sum of the forces acting between the first and second elements other than the controlled force of the second force means;whereby the force transmitted from the first element to the second element and the relative displacement between said elements are controlled.