Electrically adjustable semiactive damper control
First Claim
1. A method for controlling the damping force for at least one vibration damper of a vehicle wheel suspension of a vehicle, the method comprising the steps of:
- providing a damper for generating a damper force and said damper having a damper characteristic adjustable within an adjusting range for the damping force delimited by upper and lower limit values;
detecting a first signal representing the vertical velocity at a part of said vehicle chassis as a suspended mass;
detecting a second signal representing the vertical velocity of the unsuspended wheel mass;
computing an input control signal based on said first and second signals for adjusting said damper characteristic within said adjusting range in accordance with a standard control process;
discretely or continuously adjusting said damping characteristic to said input control signal; and
, changing said adjusting range in specific driving situations so as to cause one or both of said upper and lower limits to be raised or lowered.
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Accused Products
Abstract
One or several vibration dampers of a vehicle suspension have a damping force arrangement wherein a control signal is computed within the actuating range in accordance with a standard control method for adjusting the damper characteristic. The drive of a damper adjustable in accordance with this invention is so improved that body movements (notwithstanding a harder adjusted damping for critical driving situations) are substantially suppressed as early as possible. In specific driving situations, the adjusting range of the damper force is changed in that the upper limit of the adjusting range is raised or lowered and/or the lower limit of the adjusting range is raised or lowered. A soft damper setting takes place preferably in dependence upon signals which announce or display a change of the vehicle longitudinal deceleration or vehicle transverse acceleration.
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Citations
18 Claims
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1. A method for controlling the damping force for at least one vibration damper of a vehicle wheel suspension of a vehicle, the method comprising the steps of:
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providing a damper for generating a damper force and said damper having a damper characteristic adjustable within an adjusting range for the damping force delimited by upper and lower limit values;
detecting a first signal representing the vertical velocity at a part of said vehicle chassis as a suspended mass;
detecting a second signal representing the vertical velocity of the unsuspended wheel mass;
computing an input control signal based on said first and second signals for adjusting said damper characteristic within said adjusting range in accordance with a standard control process;
discretely or continuously adjusting said damping characteristic to said input control signal; and
,changing said adjusting range in specific driving situations so as to cause one or both of said upper and lower limits to be raised or lowered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An arrangement for controlling the damping force for at least one vibration damper of a vehicle wheel suspension of a vehicle, the arrangement comprising:
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a damper for generating a damper force and said damper having a damper characteristic adjustable within an adjusting range for the damping force delimited by upper and lower limit values;
means for detecting a first signal representing the vertical velocity at a part of said vehicle chassis as a suspended mass;
means for detecting a second signal representing the vertical velocity of the unsuspended wheel mass;
means for computing an input control signal based on said first and second signals for adjusting said damper characteristic within said adjusting range in accordance with a standard control method;
a damping force unit for discretely or continuously adjusting said damping characteristic to said input control signal; and
,means for changing said adjusting range in specific driving situations so as to cause one or both of said upper and lower limits to be raised or lowered. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification