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US5007007A Expired / Lapsed US ⏱️ 0.0 years remaining

Circuitry for converting a measurement signal disturbed by a disturbance function into an undisturbed signal

Assignee: Robert Bosch GmbH
•
Filing: 1987-08-26
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Granted: 1991-04-09
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Expires: 2007-08-26
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Abstract

Abstract Circuitry is disclosed for converting an input measurement signal V R (i), which is disturbed at least occasionally by a disturbance function, into an output, undisturbed signal V R (o) by means of a first digital adaptive filter having variable filter parameters. A control circuit is provided to change to parameters of the second adaptive filter to improve the ability of the system to filter out the disturbance signal. The apparatus includes a series circuit formed by a high pass filter and a second digital adaptive filter, coupled to receive the input signal V R (i). The control circuit switches the second adaptive filter to the adaptation mode, for determining the filter parameters necessary for suppression of the disturbance function n, when essentially only the disturbance signal reaches the second adaptive filter. Thereafter, the filter parameters of the second adaptive filter are transferred to the first adaptive filter to improve the performance of the first adaptive filter.

Inventors

  • 👤 Anton van Zanten
  • 👤 Friedrich Kost

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 07:56
CPC Classifications
H; H03; H03H; H03H21/00

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 181 words
Anti-lock brake control system having means for converting an input measurement signal V R (i), which is disturbed at least occasionally by a disturbance function, into an undisturbed, output signal V R (o), said system comprising, in combination: (a) a first digital adaptive ladder filter, having variable filter parameters and coupled to receive said input signal V R (i), for producing a filtered output signal V R (o) in which a disturbance signal is suppressed; (b) a first high pass filter coupled to receive said input signal V R (i) ; (c) a second digital adaptive ladder filter, having variable filter parameters and coupled to said first high pass filter downstream thereof; and (d) control means, coupled to said first and second digital adaptive ladder filters, for switching said second adaptive filter to the adaptation mode in response to undershooting a wheel acceleration threshold after a pressure reduction, whereupon said second filter determines the filter parameters necessary for suppression of the disturbance function, and for transferring the filter parameters so determined from said second adaptive filter to said first adaptive filter.
Claim 2
Dependent Claim 181 words
Anti-lock brake control system having means for converting an input measurement signal V R (i), which is disturbed at least occasionally by a disturbance function, into an undisturbed, output signal V R (o), said system comprising, in combination: (a) a first digital adaptive ladder filter, having variable filter parameters and coupled to receive said input signal V R (i), for producing a filtered output signal V R (o) in which a disturbance signal is suppressed; (b) a first high pass filter coupled to receive said input signal V R (i) ; (c) a second digital adaptive ladder filter, having variable filter parameters and coupled to said first high pass filter downstream thereof; and (d) control means, coupled to said first and second digital adaptive ladder filters, for switching said second adaptive filter to the adaptation mode in response to undershooting a wheel acceleration threshold after a pressure reduction, whereupon said second filter determines the filter parameters necessary for suppression of the disturbance function, and for transferring the filter parameters so determined from said second adaptive filter to said first adaptive filter.
Claim 3
Dependent Claim 77 words
The system of claim 1, further comprising a second high pass filter responsive to the output signal V R (o), and comparator means, responsive to the outputs of said second adaptive filter and said second high pass filter, for determining whether the adaptation of said second adaptive filter is better than that of said first adaptive filter, said control means causing the transfer of said filter parameters to said first adaptive filter in response to such determination.

References Cited (Backward Citations)

EP0086943A2 Cited
US4524424A Cited
US4791390A Cited
US4571732A Cited
US4701855A Cited
US4742353A Cited
US4794538A Cited
US4789994A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-04-08 1994-10-08 1995-04-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-04-08 1998-10-08 1999-04-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-04-08 2002-10-08 2003-04-09 $7700.00 Window Closed / Lapsed

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