EP0123280A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Anti-skid brake control system with control of sampling timing of input timing values of wheel speed sensor signal pulses
Assignee: Nissan Motor Co Ltd
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Filing: 1984-04-18
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Granted: —
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Expires: 2004-04-18
Abstract
Abstract An anti-skid brake control system derives number of sensor signal pulses to be ignored without sampling the input timing data is cyclically increased in stepwise fashion until the signal-to-signal interval or the duration of each group ofsen- sor signal pulses become larger than a predetermined value. Immediately after determining the numberofsensor pulses to be ignored, the sensor signal pulses input subsequently is sampled its input timing value as the first sampled timing data. After sampling the first timing data, system enters sample control mode to ignore the determined number of sensor pulses so as to sample the input timing data with respect to every given number of sensor signal pulses.
Inventors
- 👤 Jun Kubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 03:17
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17616; B60T8/32; B60T8/321; Y; Y10; Y10S; Y10S303/00; Y10S303/05
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
334 words
An anti-skid brake control system for an automotive vehicle comprising: a hydraulic brake circuit including a wheel cylinder for applying hydraulic braking pressure to a vehicle wheel; a pressure control valve disposed within said hydraulic brake circuit for controlling braking pressure to be applied to said wheel cylinder, said pressure control valve being opertive to increase the braking pressure in said wheel cylinder in its first position, to decrease the braking pressure in said wheel cylinder in its second position and to hold the braking pressure at constant value in its third position; a wheel speed sensor means for detecting wheel rotation speed and producing a sequence of sensor signal pulses having intervals representative of the detected wheel rotation speed; a timer means sequentially outputting timer signal indicative of elapsed time; a first means for deriving interval of adjacent sensor signal pulses and determining number of sensor signal pulses to be ignored in sampling of input timing value to form groups of given number of sensor signal pulses so that the duration of each group is longer than a predetermined period; a second means for sampling input timing values for every leading sensor signal pulses of every groups of said given number of sensor signal pulses and for storing sampled input timing values; a third means for deriving brake control parameters based on sampled input timing values and producing a control signal to be fed to said pressure control valve to operate the latter to one of said first, second and third positions; and a fourth means for governing operations of said second and third means, said fourth means interrupting operation of said third means in response to every leading sensor signal pulses of every groups of sensor signal pulses to operate said second means for sampling input timing data, said fourth means further governing operation of said second means so that second means samples the input timing value of the sensor signal pulse input immediately after terminating of operation of said first means.
Claim 2
Dependent Claim
334 words
An anti-skid brake control system for an automotive vehicle comprising: a hydraulic brake circuit including a wheel cylinder for applying hydraulic braking pressure to a vehicle wheel; a pressure control valve disposed within said hydraulic brake circuit for controlling braking pressure to be applied to said wheel cylinder, said pressure control valve being opertive to increase the braking pressure in said wheel cylinder in its first position, to decrease the braking pressure in said wheel cylinder in its second position and to hold the braking pressure at constant value in its third position; a wheel speed sensor means for detecting wheel rotation speed and producing a sequence of sensor signal pulses having intervals representative of the detected wheel rotation speed; a timer means sequentially outputting timer signal indicative of elapsed time; a first means for deriving interval of adjacent sensor signal pulses and determining number of sensor signal pulses to be ignored in sampling of input timing value to form groups of given number of sensor signal pulses so that the duration of each group is longer than a predetermined period; a second means for sampling input timing values for every leading sensor signal pulses of every groups of said given number of sensor signal pulses and for storing sampled input timing values; a third means for deriving brake control parameters based on sampled input timing values and producing a control signal to be fed to said pressure control valve to operate the latter to one of said first, second and third positions; and a fourth means for governing operations of said second and third means, said fourth means interrupting operation of said third means in response to every leading sensor signal pulses of every groups of sensor signal pulses to operate said second means for sampling input timing data, said fourth means further governing operation of said second means so that second means samples the input timing value of the sensor signal pulse input immediately after terminating of operation of said first means.
Claim 3
Dependent Claim
41 words
The anti-skid brake control system as set forth in claim 1, wherein said first means cyclically operates to increase number of'sensor signal pulses to form each of said groups until the duration of said group become longer than said predetermined period.
Claim 4
Dependent Claim
32 words
The anti-skid brake control system as set forth in claim 2, wherein said fourth means is responsive to said first means terminating operation thereof to selectively operate said second and third means.
Claim 5
Dependent Claim
29 words
The anti-skid brake control system as set forth in claim 3, wherein said third means derived said brake control parameter including wheel rotation speed and wheel acceleration and deceleration.
Claim 6
Dependent Claim
46 words
The anti-skid brake control system as set forth in claim 4, wherein said second means samples the input timing value of said sensor signal pulse input immediately after terminating of operation of said first means as first input timing data for deriving said brake control parameter.
Claim 7
Dependent Claim
30 words
The anti-skid brake control system as set forth in claim 5, wherein said first means increases the number of sensor signal pulses to form each group in stepwise ' fashion.
Claim 8
Dependent Claim
265 words
An anti-skid brake control system for an automotive brake system comprising: a hydraulic brake circuit including a wheel cylinder for applying hydraulic braking pressure to a vehicle wheel; a pressure control valve disposed within said hydraulic brake circuit for controlling braking pressure to be applied to said wheel cylinder, said pressure control valve being opertive to increase the braking pressure in said wheel cylinder in its first position, to decrease the braking pressure in said wheel cylinder in its second position and to hold the braking pressure at constant value in its third position; a wheel speed sensor means for detecting wheel rotation speed and producing a sequence of sensor signal pulses having intervals representative of the detected wheel rotation speed; a timer means sequentially outputting timer signal indicative of elapsed time; a controller for deriving a size of sensor signal pulses group so that the duration of said group becomes longer than a predetermined period, for sampling input timing values of every first sensor signal pulses of every groups to store the sampled value as input timing data, and for deriving a brake control parameters based on said input timing data for deriving control signal to operate said pressure control valve to one of said first, second and third positions, said controller performing operation for sampling the input time values by interrupting operation for deriving the control signal, and said controller being responsive to the sensor signal pulses input immediately after deriving the size of group, to perform said sampling operation as leading sensor signal pulse of the first group of sensor signal pulses.
Claim 9
Dependent Claim
265 words
An anti-skid brake control system for an automotive brake system comprising: a hydraulic brake circuit including a wheel cylinder for applying hydraulic braking pressure to a vehicle wheel; a pressure control valve disposed within said hydraulic brake circuit for controlling braking pressure to be applied to said wheel cylinder, said pressure control valve being opertive to increase the braking pressure in said wheel cylinder in its first position, to decrease the braking pressure in said wheel cylinder in its second position and to hold the braking pressure at constant value in its third position; a wheel speed sensor means for detecting wheel rotation speed and producing a sequence of sensor signal pulses having intervals representative of the detected wheel rotation speed; a timer means sequentially outputting timer signal indicative of elapsed time; a controller for deriving a size of sensor signal pulses group so that the duration of said group becomes longer than a predetermined period, for sampling input timing values of every first sensor signal pulses of every groups to store the sampled value as input timing data, and for deriving a brake control parameters based on said input timing data for deriving control signal to operate said pressure control valve to one of said first, second and third positions, said controller performing operation for sampling the input time values by interrupting operation for deriving the control signal, and said controller being responsive to the sensor signal pulses input immediately after deriving the size of group, to perform said sampling operation as leading sensor signal pulse of the first group of sensor signal pulses.
Claim 10
Dependent Claim
29 words
8 . The anti-skid brake control system as set forth in claim 7, wherein said controller derives wheel speed, wheel acceleration and slip data on said input timing data.
Claim 11
Dependent Claim
49 words
The anti-skid control system as set forth in claim 8, wherein said controller performs calculation for deriving the wheel acceleration and deceleration when a difference of durations of successive pair of groups of sensor signal pulses is large enough to exceed a given calculation threshold to perform the calculation.
Claim 12
Dependent Claim
35 words
The anti-skid brake control system as set forth in claim 9, wherein said controller derives the size of each group of sensor signal pulses by increasing number of sensor signal pulses cyclically and stepwise fashion.
Claim 13
Dependent Claim
55 words
The anti-skid brake control system as set forth in claim 10, wherein said controller interrupts operation for deriving said control signal whenever the leasing sensor signal pulse of each group of sensor signal pulses is input, so as to perform operation for sampling the input timing value with respect to said leasing sensor signal pulse.
Claim 14
Dependent Claim
219 words
In an automotive hydraulic brake system including a hydraulic circuit including a wheel cylinder for applying hydraulic brake pressure to a vehicle wheel, a pressure control valve associated with said hydraulic circuit for adjusting fluid pressure to be applied to said wheel cylinder, a method for controlling said hydraulic brake system to prevent the wheel from skidding coi:prising the steps of: producing a sequence of pulses having intervals representative of peripheral speed of wheel; producing a timer signal indicative of elapsed time; detecting signal-to-signal interval to determine a size of group of said pulses so that the duration of the grouped pulses becomes longer than a predetermined period; sampling timer signal value at inputting of said pulse and storing the sampled timer signal value as input timing data of pulses; deriving control signal for operating said pressure control valve to increase fluid pressure to be applied to said wheel cylinder in its application mode, to decrease fluid pressure in its release mode and to hold the fluid pressure at constant value in its hold mode, based on control parameters derived from said input timing data; and controlling sampling of timer signal value so as to sample the input timing data with respect to the pulses produced immediately after deriving of said size of said group of sensor signal pulses.
Claim 15
Dependent Claim
219 words
In an automotive hydraulic brake system including a hydraulic circuit including a wheel cylinder for applying hydraulic brake pressure to a vehicle wheel, a pressure control valve associated with said hydraulic circuit for adjusting fluid pressure to be applied to said wheel cylinder, a method for controlling said hydraulic brake system to prevent the wheel from skidding coi:prising the steps of: producing a sequence of pulses having intervals representative of peripheral speed of wheel; producing a timer signal indicative of elapsed time; detecting signal-to-signal interval to determine a size of group of said pulses so that the duration of the grouped pulses becomes longer than a predetermined period; sampling timer signal value at inputting of said pulse and storing the sampled timer signal value as input timing data of pulses; deriving control signal for operating said pressure control valve to increase fluid pressure to be applied to said wheel cylinder in its application mode, to decrease fluid pressure in its release mode and to hold the fluid pressure at constant value in its hold mode, based on control parameters derived from said input timing data; and controlling sampling of timer signal value so as to sample the input timing data with respect to the pulses produced immediately after deriving of said size of said group of sensor signal pulses.
Claim 16
Dependent Claim
22 words
The method as set forth in claim 12, in which number of pulses to form said group is increased in stepwise fashion.
Claim 17
Dependent Claim
21 words
The method as set forth in claim 13, in which operation for deriving the size of said group is performed cyclically.
Claim 18
Dependent Claim
40 words
The method as set forth in claim 14, in which opertion for sampling the timer signal values with respect to the leading sensor signal of each group of said pulses is performed by interrupting operation for deriving said control signal.
Claim 19
Dependent Claim
34 words
The method as set forth in claim 15, in which said pulse input immediately after deriving the size of said group is taken as the leading pulse of the first group of the pulses.
References Cited (Backward Citations)
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