System to generate signals for control or regulation of a contro

Details System to generate signals for control or regulation of a contro System to generate signals for control or regulation of a contro

1993-01-15

1996-10-08

Park, Collin W.

Boots, shoes, and leggings

280707, B60G 1708

Patent

active

055637892

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a system according to the category of the main claim.
To improve the travel comfort of passenger cars or trucks, the design of the chassis is of considerable significance. Necessary for it are sufficient spring and/or damping systems as components of a chassis.
With passive chassis, which presently continue to be used predominantly, the spring and/or damping systems are designed at the time of installation to be either relatively hard ("sporty") or relatively soft ("comfortable"), depending on the predicted use of the vehicle. Influencing the chassis characteristic during the travel operation is not possible with these systems.
With active chassis, in contrast, the characteristic of the spring and/or damping systems can be influenced during the travel operation in the sense of a control or regulation, depending on the state of travel.
What must first be considered for the control or regulation of such an active chassis are the needs of the passengers and cargo as well as the type of road surface. Viewed as impairments of travel comfort by the passengers or by a cargo sensitive to shocks are the vertical movements of the vehicle body. the causes of these vehicle body movements are stimulations by road surface unevennesses and variations of the state of travel, such as steering, braking and acceleration.
A minimization of the vehicle body movements results in a high travel comfort. To counteract the vehicle body movements by an active spring and/or damping system in a diminishing way, the U.S. Pat. No. 3,807,678 describes a system for chassis control where the vehicle body is isolated from stimulations by the road surface unevennesses. To that end, suspension systems are arranged between the body and wheels of a chassis in such a way that a force can be applied between the body and the wheels. This force is determined by comparisons of sensed relative movements between vehicle body and wheels to sensed body movements. Such a system for minimization of body movements is generally called a "skyhook control. "
A disadvantage of this system is constituted in that the minimization of the body movements is performed separately for each system comprised of a wheel unit and the prorated vehicle body and of the suspension arranged between wheel unit and vehicle body. This "local" version of the skyhook control thus makes no allowance for the collective body movements, such as heave, roll and pitch movements or the vertical movement of the body at the front and rear axles. Such collective body movements, e.g., are the consequence of steering, braking and accelerating maneuvers.
The problem underlying the present inventional system is to influence selected components of movement independently from one another and at different weighting, in the framework of influencing the body movements.


ADVANTAGES OF THE INVENTION

As compared to the prior art, the present invention offers the advantage that selected components of movement, such as heave, roll and pitch movements or the vertical movement at the front and rear axles, can be influenced along with the roll movement, separately from one another and to different extents.
According to the invention, signals are determined which represent the vertical movement of the body at selected points. Basing on these signals, specific components of movement are inferred, making it possible to weight these components differently. These weightings may be effected, e.g., under allowance for the state of travel of the vehicle, such as braking, acceleration and steering.
Basing on these differently weighted motive components, weighted vertical movements of the body are inventionally inferred at points where the wheel suspension systems attach to the body.
Moreover, signals are determined which represent the relative movements between the wheel units and the body of the vehicle (spring deflection movements).
By comparing the weighted vertical movements at the points where the wheel suspension systems attach to the body to the pertaining relative moveme

REFERENCES:
patent: 3807678 (1974-04-01), Karnopp et al.
patent: 5062657 (1991-11-01), Majeed
patent: 5062658 (1991-11-01), Majeed
patent: 5071157 (1991-12-01), Majeed
patent: 5096217 (1992-03-01), Hanson et al.
patent: 5097419 (1992-03-01), Lizell
patent: 5231583 (1993-06-01), Lizell
patent: 5235529 (1993-08-01), Hanson et al.
patent: 5289379 (1994-02-01), Williams
German International Search Report, Completed Oct. 2, 1992.

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