GB1603459A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Process and apparatus for detecting spurious control signals in an anti-skid brake control system
Assignee: Wabco Fahrzeugbremsen GmbH
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Filing: 1978-05-25
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Granted: —
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Expires: 1998-05-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/173
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
236 words
WHAT WE CLAIM IS : 1. A process for detecting and blocking spurious signals due to variations in rotational speed of a vehicle wheel running on an uneven surface, which signals may initiate undesirable brake control operations in an anti-skid brake control system of the vehicle, the system including means for deriving signals representing the angular velocity of at least two of the vehicle wheels, means responsive to the angular velocity signals for deriving acceleration, deceleration and slip control signals for the at least two wheels respectively when specific threshold values are exceeded, and means responsive to the control signals for energising one or more solenoid operated valves for controlling the flow of brake pressure medium, wherein for each of the at least two wheels a test is made for a frequency component in one or more of the control signals above a threshold frequency or the presence or absence of one or more of the control signals in relation to another control signal in accordance with a particular combination or sequence of control signals, the occurrence of which frequency component, combination or sequence indicates whether or not a normal controlled braking process is taking place, and the other control signal or a signal derived from the other control signal is blocked if the result of the test indicates that a normal controlled braking process is not taking place, thereby blocking an undesirable brake control operation.
Claim 2
Dependent Claim
49 words
A process according to claim 1, wherein the actual frequency of the acceleration control signal is compared with a predetermined frequency threshold, and when this threshold is exceeded, a switching signal is generated that blocks the initiation of a brake control operation by the deceleration control signal or signals.
Claim 3
Dependent Claim
37 words
A process according to claim 1 or 2 wherein the other control signal or the signal derived from the other control signal is blocked by raising the threshold value for the generation of the other control signal.
Claim 4
Dependent Claim
37 words
A process according to claim I or 2 wherein the other control signal or the signal derived from the other control signal is blocked by gating means responsive to the one or more of the control signals.
Claim 5
Dependent Claim
56 words
A process according to any of claims I to 4 in which the system inclues a pulse generator connected to energise a solenoid valve so as to produce a slow build-up of brake pressure following a reduction thereof, wherein a control signal for starting the pulse generator and/or the signals from the pulse generator are blocked.
Claim 6
Dependent Claim
42 words
A process according to claim 5 wherein the signals from the pulse generator can be blocked by a bistable, which bistable can be reset by the end of a signal initiating a brake control process and set by a slip control signal.
Claim 7
Dependent Claim
36 words
A process according to claim I wherein the threshold value for the derivation of the deceleration control signal is increased if a slip control signal does not occur within the duration of a deceleration control signal.
Claim 8
Dependent Claim
16 words
A process according to claim 7 wherein the threshold value is increased by a specific amount.
Claim 9
Dependent Claim
43 words
A process according to claim 7 or 8 wherein the threshold value for the derivation of the deceleration control signal is reduced after having been increased on the first occurrence of a slip control signal within the duration of a deceleration control signal.
Claim 10
Dependent Claim
41 words
A process according to claim 9 wherein the threshold value for the derivation of the deceleration control signal is reduced to an initial value on the second occurrence of a slip control signal within the duration of a deceleration control signal.
Claim 11
Dependent Claim
46 words
A process according to claim 5 in which the acceleration control signal is applied to block the operation of the pulse generator and both the acceleration control signal and the output of the pulse generator are blocked if a rapid succession of deceleration control signals occurs.
Claim 12
Dependent Claim
26 words
A process according to claim 6 wherein the signal initiating a brake control process is derived from the deceleration control signal and/or the slip control signal.
Claim 13
Dependent Claim
40 words
A process according to claim 12 wherein the signal initiating a brake control process is used to unblock the acceleration control signal which can then be applied to operate a solenoid valve and block the operation of the pulse generator.
Claim 14
Dependent Claim
59 words
A process for detecting and blocking spurious signals due to variations in rotational speed of a vehicle wheel running on an uneven surface, which signals may initiate undesirable brake control operations in an anti-skid brake control system of the vehicle, the process being substantially as described herein with reference to any of Figures) to 8 of the accompanying drawings.
Claim 15
Dependent Claim
105 words
Apparatus for carrying out a process according to any of claims I to ! 4 having at least two sensors respectively responsive to the rotational behaviour of at least two of the vehicle wheels, and for each of the at least two wheels acceleration, deceleration and slip threshold value stages respectively for the generation of the acceleration, deceleration and slip control signals, and means responsive to the control signals for energising the one or more solenoid operated valves, the apparatus further including logic means responsive to the one or more of the control signals to block the other control signal or the signal derived therefrom.
Claim 16
Dependent Claim
60 words
Apparatus according to claim 15 having a pulse generator connected to energise one of the solenoid valves and including a circuit for causing the pulse generator to generate pulses for a predetermined period of time following the end of the deceleration control signal and for blocking the operation of the pulse generator at the end of the period of time.
Claim 17
Dependent Claim
78 words
Apparatus according to claim 16 including an AND-gate through which the pulses from the pulse'generator are applied to energise the one solenoid valve, a bistable having an output connected to control the AND-gate, a first input for a setting signal connected to receive the slip control signal and a second input for a resetting signal connected to receive a delayed signal following the end of an ORlogical combination of the deceleration control signal and the slip control signal.
Claim 18
Dependent Claim
21 words
Apparatus according to claim 17, wherein the acceleration control signal is also connected to block the operation of the pulse generator.
Claim 19
Dependent Claim
44 words
Apparatus according to claim 18 including an AND-gate connected in the path of the acceleration control signal, which gate is controlled either by the output of the bistable or by an inverted form of the signal applied to the second input of the bistable.
Claim 20
Dependent Claim
46 words
Apparatus according to claim 15 wherein the deceleration threshold value stage for the generation of the deceleration control signals has a high threshold value and is reduced in response to a signal from the logic means indicating that a normal controlled braking process is taking place.
Claim 21
Dependent Claim
28 words
Apparatus according to claim 15 wherein the logic means inclues a bistable circuit connected to block the deceleration control signal until the occurence of a slip control signal.
Claim 22
Dependent Claim
55 words
Apparatus according to claim 15 including a pulse generator connected to energise one of the solenoid valves so as to produce a s!owbui)d-up of brake pressure following a reduction thereof, wherein the logic means is connected to block the output of the pulse generator on the occurrence of a rapid succession of deceleration control signals.
Claim 23
Dependent Claim
49 words
Apparatus according to claim 15 wherein the logic means includes a circuit responsive to the frequency of the acceleration control signal being above a threshold frequency the output signal of which is connected to block completely or raise the threshold value for the generation of the deceleration control signal.
Claim 24
Dependent Claim
58 words
Apparatus for detecting and blocking spurious signals due to variations in speed of a vehicle wheel running on an uneven surface, which signals may initiate undesirable brake control operations in an anti-skid brake control system of the vehicle, the apparatus being substantially as herein described with reference to any of
Figures I to 8 of the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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