EP0205277A2
Expired / Lapsed
EP
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Vehicle braking system
Assignee: ZF International UK Ltd
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Filing: 1986-05-27
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Granted: —
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Expires: 2006-05-27
Abstract
Abstract An electronically controlled braking system for a vehicle in which vehicle load measurements, made dynamically, as used to modify the braking demand, individually for each axle of the vehicle and in which, under predetermined conditions of vehicle speed, braking level and operating gradient, the deceleration error formed between braking demand by the driver and measured actual vehicle deceleration is used gradually, over a number of vehicle stops, to form an adaptive factor for correcting the braking demand in order to restore expected braking perfor-Imance. No correction to the adaptive factor based on the deceleration error is made during a given stopping operation of the vehicle, but a summation of previous errors is arranged to cause a small increment in correction to be made after each stop until, over a number of vehicle stops, the error formed under the predetermined conditions falls to zero. Braking demands by the driver can be arranged to be compensated by introducing a demand offset dependent on the prevailing gradient on which the vehicle is operating.
Inventors
- 👤 Malcolm Brearley
- 👤 Richard Brian Moseley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
B; B60; B60L; B60L7/00; B60T; B60T13/00; B60T13/10; B60T13/66; B60T13/662; B60T13/68; B60T8/00; B60T8/17; B60T8/1701; B60T8/1708; B60T8/26; B60T8/266; B60T8/32; B60T8/34; B60T8/50; B60T8/5056
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
An electronically controlled braking system for a vehicle characterised in that vehicle load measurements, made dynamically, are used to modify the braking demand, individually for each axle of the vehicle and in which, under predetermined conditions of vehicle speed, braking level and operating gradient, the deceleration error formed between braking demand by the driver and measured actual vehicle deceleration is used gradually, over a number of vehicle stops, to form an adaptive factor for correcting the braking demand in order to restore expected braking performance.
Claim 2
Dependent Claim
85 words
An electronically controlled braking system for a vehicle characterised in that vehicle load measurements, made dynamically, are used to modify the braking demand, individually for each axle of the vehicle and in which, under predetermined conditions of vehicle speed, braking level and operating gradient, the deceleration error formed between braking demand by the driver and measured actual vehicle deceleration is used gradually, over a number of vehicle stops, to form an adaptive factor for correcting the braking demand in order to restore expected braking performance.
Claim 3
Dependent Claim
74 words
An electronically controlled braking system as claimed in claim 1, wherein no correction to said adaptive factor based on the deceleration error is arranged to be made during a given stopping operation of the vehicle, but wherein a summation of previous errors is arranged to cause a small increment in correction to be made after each stop until, over a number of vehicle stops, said error formed under said predetermined conditions falls to zero.
Claim 4
Dependent Claim
68 words
An electronically controlled braking system as claimed in claim 2, wherein braking demands by the driver are arranged to be compensated by introducing a demand offset dependent on the prevailing gradient on which the vehicle is operating, said operating gradient being measured as an equivalent deceleration, by comparison of an on board deceleration transducer and a corresponding figure generated by measuring the rate of change of wheel speeds.
Claim 5
Dependent Claim
44 words
An electronically controlled braking system as claimed in claim 3, in which the gradient correction is made at low vehicle speeds but based on data which was obtained at speeds above a predetermined low limit and which is inhibited at very low braking demands.
Claim 6
Dependent Claim
43 words
An electronically controlled braking system as claimed in claim 4, in which the gradient correction is permitted to provide a demand offset but is inhibited from ever exceeding the actual driver demand in amplitude, and at very low demand is reduced to zero.
Claim 7
Dependent Claim
47 words
An electronically controlled braking system as claimed in any of claims 1 to 5, wherein the adaptive factor slowly built up over a number of vehicle stops is used to form a vehicle brake performance figure which can be output by the system via a diagnostic port.
Claim 8
Dependent Claim
42 words
An electronically controlled braking system as claimed in any of claims 1 to 6, in which the adaptive factor is monitored against a predetermined level and is arranged to provide a warning signal indicative of brake deficiency if this level is exceeded.
Claim 9
Dependent Claim
170 words
An electronically controlled braking system for a vehicle having a plurality of pressure control channels (10) adapted to be controlled by a driver's demand signal from a brake pedal transducer - (12), representing a braking requirement, characterised by first sensor means (30) providing dynamic load signals (L) representative of vehicle axle loads, second sensor means (34) forming a signal (F) representative of vehicle deceleration, third sensor means (38) forming a signal G representative of the gradient on which the vehicle is operating, means (46) forming an error signal (FE) representative of the difference between braking demand and measured vehicle deceleration, means (42,72) for modifying the driver's braking demand signals in dependence upon the vehicle axle load measurements from said first sensor means (30) and means (48) for forming from said deceleration error (FE), gradually over a number of vehicle stops and under certain conditions of vehicle speed, braking level and operating gradient, a long term adaptive factor (c) for correcting the braking demand in order to restore expected braking performance.
Claim 10
Dependent Claim
170 words
An electronically controlled braking system for a vehicle having a plurality of pressure control channels (10) adapted to be controlled by a driver's demand signal from a brake pedal transducer - (12), representing a braking requirement, characterised by first sensor means (30) providing dynamic load signals (L) representative of vehicle axle loads, second sensor means (34) forming a signal (F) representative of vehicle deceleration, third sensor means (38) forming a signal G representative of the gradient on which the vehicle is operating, means (46) forming an error signal (FE) representative of the difference between braking demand and measured vehicle deceleration, means (42,72) for modifying the driver's braking demand signals in dependence upon the vehicle axle load measurements from said first sensor means (30) and means (48) for forming from said deceleration error (FE), gradually over a number of vehicle stops and under certain conditions of vehicle speed, braking level and operating gradient, a long term adaptive factor (c) for correcting the braking demand in order to restore expected braking performance.
Claim 11
Dependent Claim
41 words
An electronically controlled braking system as claimed in claim 8, further including a means - (39) in which said braking demand signals are further modified by the introduction of a demand offset dependent on said signal G representative of operating gradient.
Claim 12
Dependent Claim
52 words
An electronically controlled braking system as claimed in claim 9, wherein said third sensor means 38 measures said operating gradient as an equivalent deceleration by effecting a comparison of the signal from said second sensor means (34) and a corresponding figure generated by measuring the rate of change of vehicle wheel speed.
References Cited (Backward Citations)
No citation records indexed.
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