Method for controlling the damping force of an adjustable damper in a motor vehicle
First Claim
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1. A method for controlling (open loop or closed loop) the damping force of an adjustable damper in a motor vehicle having an active or semi-active damping system, the method comprising the steps of:
- measuring the distance between a wheel and the bodywork of said motor vehicle utilizing distance sensors for generating distance sensor signals (hi);
forming a difference of said distance sensor signals (hi);
determining damping velocity signals (Vdl, Vds) from said difference of said distance sensor signals (hi) over a fixed time difference;
determining the damning velocity (VDK) from said damping velocity signals (Vdl, Vds); and
, controlling (open loop or closed loop) said damping force in dependence upon the damping velocity (VDK).
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Abstract
A method controls (open loop and/or closed loop) the damping force of adjustable dampers in vehicles, especially in motor vehicles, with active or semi-active damping systems. The method effects economically and rapidly a reliable control (open loop or closed loop). The control (open loop and closed loop) takes place in dependence upon the damper velocity (VDK) and the damper velocity signals are determined with the aid of distance sensors and difference formation of the distance sensor signals over a predetermined time difference.
29 Citations
16 Claims
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1. A method for controlling (open loop or closed loop) the damping force of an adjustable damper in a motor vehicle having an active or semi-active damping system, the method comprising the steps of:
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measuring the distance between a wheel and the bodywork of said motor vehicle utilizing distance sensors for generating distance sensor signals (hi);
forming a difference of said distance sensor signals (hi);
determining damping velocity signals (Vdl, Vds) from said difference of said distance sensor signals (hi) over a fixed time difference;
determining the damning velocity (VDK) from said damping velocity signals (Vdl, Vds); and
,controlling (open loop or closed loop) said damping force in dependence upon the damping velocity (VDK). - View Dependent Claims (2, 3, 4)
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5. A method for controlling (open loop or closed loop) the damning force of an adjustable damper in a motor vehicle having an active or semi-active damping system, the method comprising the steps of:
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determining damping velocity signals (Vdl, Vds) utilizing distance sensors and a difference formation of the distance sensor signals (hi) over a fixed time difference;
controlling (open loop or closed loop) said damping force in dependence upon the damning velocity (VDK); and
,wherein a first one of said damping velocity signals (Vds) is determined via the difference formation of said distance sensor signal (hi) over a first time interval and a second one of said velocity signals (Vdl) via the difference formation of said distance signal (hi) over a second time interval; and
, said first time interval being less than said second time interval; and
, a selection is made based on fixed parameters as to which one of said damping velocity signals (Vdl, Vds) is to form the basis of the control of said damping force (FD). - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling (open loop or closed loop) the damping force of an adjustable damper in a motor vehicle having an active or semi-active damping system, the method comprising the steps of:
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determining damping velocity signals (Vdl, Vds) over a fixed time difference utilizing distance sensors and a difference formation of the distance sensor signals (hi);
controlling (open loop or closed loop) said damping force in dependence upon the damping velocity (VDK);
wherein said distance sensor signal (hi) is filtered with a first lowpass filter having a small time constant (T1) to determine a first output signal (hs) and is filtered with a second lowpass filter having a greater time constant (T2) to determine a second output signal (hl);
the magnitude of a difference signal (dh) between said first and second output signals (hs, hl) is used as a parameter; and
, a selection is made based on a fixed threshold value of said difference signal (dh) as to which of said damping velocity signals (Vds, Vdl) forms the basis of said control of said damping force. - View Dependent Claims (14, 15, 16)
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Specification