Patent EP0145374A2 successfully refreshed from Google Patents.
EP0145374A2
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EP
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Automatic speed control systems
Assignee: AE PLC
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Filing: 1984-11-21
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Granted: —
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Expires: 2004-11-21
Abstract
Abstract @ An automatic speed control system particularly for use with coaches has a comparator (12) for comparing the actual road speed of the vehicle with a reference to produce an error signal for controlling the engine power via a control unit (18) so as to hold the vehicle at the desired speed. In addition the error signal is fed to a comparator (52) which, if the error signal indicates too high an excess speed, provides positive retardation of the vehicle via a retardation unit (30) which may be the actual brakes of the vehicle or (preferably) its electric retarder. A comparator (54) may also be arranged to be responsive to excess engine speed and to actuate the retarder via an OR gate (60).
Inventors
- 👤 Kenneth Bruce Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 19:09
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60K; B60K31/00; B60K31/02; B60K31/04; B60K31/042; B60T; B60T7/00; B60T7/12; B60W10/18; B60W10/196; B60W30/00; B60W30/18; B60W30/1819; B60W2510/00; B60W2510/06; B60W2510/0638
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
An automatic speed control system for a vehicle, comprising means (5;40) operative to produce an actual speed signal (Vs1;Vs2) representing actual speed, and control means (12,14;52,54) responsive to the actual speed signal (Vs1;Vs2) so as to produce a control signal (Ve2) when the actual speed exceeds a predetermined limit speed, and characterised by output . means (30) responsive to the control signal (Ve2) to provide positive retardation of the vehicle.
Claim 2
Dependent Claim
70 words
An automatic speed control system for a vehicle, comprising means (5;40) operative to produce an actual speed signal (Vs1;Vs2) representing actual speed, and control means (12,14;52,54) responsive to the actual speed signal (Vs1;Vs2) so as to produce a control signal (Ve2) when the actual speed exceeds a predetermined limit speed, and characterised by output . means (30) responsive to the control signal (Ve2) to provide positive retardation of the vehicle.
Claim 3
Dependent Claim
27 words
A system according to claim 1, characterised in that the output means (30) includes means for operating the vehicle brakes in dependence on the said control signal.
Claim 4
Dependent Claim
34 words
A system according to claim 1, characterised in that the output means (30) includes an electric retarder, in which the output means includes means responsive to the control signal to actuate the electrical retarder.
Claim 5
Independent Claim
20 words
A system according to any preceding claim, in that the actual speed represents the actual road speed of the vehicle.
Claim 6
Independent Claim
25 words
A system according to any preceding claim, in that the actual speed represents the actual engine speed of the vehicle (independent of its road speed).
Claim 7
Independent Claim
79 words
A system according to any preceding claim, characterised by means (12;12,48) responsive the actual speed signal (Vs1;Vs1 or Vs2) and a reference speed signal (Vr1;Vr1 or Vr3) to produce an error signal (Ve1;Ve1 or Ve3) whose sign and magnitude is representative of the difference if any between them, and means (18) responsive to the error signal to adjust the power of the engine (20) of the vehicle to tend to reduce the error signal (Ve1;Ve1 or Ve2) to zero.
Claim 8
Dependent Claim
150 words
A system according to claim 6, characterised in that the means operative to produce the error signal comprises first speed-dependent means (5,79) operative to produce an actual road speed signal (Vs1) representing the actual road speed of the vehicle, second speed-dependent means (40,43,44) operative to produce an actual engine speed signal (Vs2) representing the actual engine speed of the vehicle independently of its road speed, and first comparing means (12 or 48) for comparing one (Vs1 or Vs2) of the said actual speed signals with a predetermined reference signal (Vr1 or Vr3) whereby to produce the said error signal (Ve1 or Ve3) indicating the sign and magnitude of any error between them, and by second comparing means (52,54) operative in dependent on one or both actual speed signals (Vs1 or Vs3) to determine when one or both of them exceeds a predetermined limit speed to produce the said control signal.
Claim 9
Dependent Claim
96 words
A system according to claim 7, characterised in that the second comparing means comprises means (52 or 54) for comparing the said one actual speed signal (Vs1 or Vs2) with a second reference signal (Vr1 or Vr3) representing the said predetermined limit speed whereby to produce a first said control signal, and means (54 or 42) responsive to the other actual speed signal (Vs2 or Vs1) for comparing that other speed signal with a further speed reference signal (Vr3 or Vr1) representing the said predetermined limit speed so as to produce a second said control signal.
Claim 10
Dependent Claim
170 words
An automatic speed control system for a vehicle, comprising means (eg 12) responsive to an actual speed signal (eg Vs1) to produce an error signal (eg Ve1) representing the signal and magnitude of any error between the actual speed and a desired value thereof, and speed control means (18) responsive to the error signal (eg Vel) to control the power of the vehicle's engine (20) in such a manner as to reduce the error to zero, characterised by means (48) responsive to a different actual speed signal (eg Vs2) to produce a second error signal (eg Ve3) representing the sign and magnitude of any error between the actual speed represented by that different actual speed signal (Vs2) and a desired value thereof, one said actual speed signal representing the speed of the vehicle and the other representing the speed of the vehicle, and means (50) operative to compare both error signals (Vel, Ve3) to determine which represents the greater error to feed that error signal to the speed control means.
Claim 11
Dependent Claim
170 words
An automatic speed control system for a vehicle, comprising means (eg 12) responsive to an actual speed signal (eg Vs1) to produce an error signal (eg Ve1) representing the signal and magnitude of any error between the actual speed and a desired value thereof, and speed control means (18) responsive to the error signal (eg Vel) to control the power of the vehicle's engine (20) in such a manner as to reduce the error to zero, characterised by means (48) responsive to a different actual speed signal (eg Vs2) to produce a second error signal (eg Ve3) representing the sign and magnitude of any error between the actual speed represented by that different actual speed signal (Vs2) and a desired value thereof, one said actual speed signal representing the speed of the vehicle and the other representing the speed of the vehicle, and means (50) operative to compare both error signals (Vel, Ve3) to determine which represents the greater error to feed that error signal to the speed control means.
Claim 12
Dependent Claim
37 words
A system according to claim 10, characterised by retarder means (30) responsive to at least one said actual speed signal to produce positive retardation of the vehicle when the speed represented thereby exceeds a predetermined limit speed.
References Cited (Backward Citations)
No citation records indexed.
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