US5062404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine throttle control system
Assignee: ZF International UK Ltd
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Filing: 1990-04-13
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Granted: 1991-11-05
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Expires: 2010-04-13
Abstract
Abstract An engine throttle control system actuates a throttle by means of a motor. In order to overcome static friction, a differentiator differentiates a throttle position demand signal and adds the differentiated signal to the demand signal. This composite signal is used by a control unit to drive the motor.
Inventors
- 👤 Peter G. Scotson
- 👤 John M. Ironside
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:55
CPC Classifications
F; F02; F02D; F02D9/00; F02D9/08; F02D41/00; F02D41/02; F02D41/04; F02D41/10; F02D11/00; F02D11/06; F02D11/10; F02D11/105; F02D11/107; F02B; F02B3/00; F02B3/06; F02D2011/101; F02D2011/102; F02D2250/00; F02D2250/16; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2474
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
An engine throttle control system for a throttle motor, said system comprising a control circuit for supplying a drive to the throttle motor in response to an error between a throttle position demand signal and an actual throttle position signal, said control circuit including augmenting means responsive to a change in the throttle position demand signal for temporarily augmenting the throttle position demand signal by applying a transient increase to the change in the throttle position signal.
Claim 2
Dependent Claim
77 words
An engine throttle control system for a throttle motor, said system comprising a control circuit for supplying a drive to the throttle motor in response to an error between a throttle position demand signal and an actual throttle position signal, said control circuit including augmenting means responsive to a change in the throttle position demand signal for temporarily augmenting the throttle position demand signal by applying a transient increase to the change in the throttle position signal.
Claim 3
Dependent Claim
61 words
A system as claimed in claim 1, in which said augmenting means is arranged to supply the transient increase as a first pulse whose amplitude is a first function of a rate of change of the throttle position demand signal and whose polarity is a second function of a polarity of the rate of change of the throttle position demand signal.
Claim 4
Dependent Claim
41 words
A system as claimed in claim 2, in which said augmenting means comprises differentiating means for differentiating the throttle position demand signal to provide a differentiated signal and adding means for adding the differentiated signal to the throttle position demand signal.
Claim 5
Dependent Claim
81 words
A system as claimed in claim 1, in which said augmenting means is arranged to supply the transient increase as a second pulse whose amplitude is a third function of a rate of change of the actual throttle position signal and of a difference between the actual throttle position signal and the demanded throttle position signal, and whose polarity is a fourth function of a polarity of the difference between the actual throttle position signal and the demanded throttle position signal.
Claim 6
Dependent Claim
53 words
A system as claimed in claim 4, in which said augmenting means includes function generating means for forming a difference signal between an amplitude of the difference between the actual throttle position signal and the demanded throttle position signal and an amplitude of a rate of change of the actual throttle position signal.
Claim 7
Dependent Claim
37 words
A system as claimed in claim 4, in which said augmenting means is arranged to supply a third pulse subsequent to the second pulse and having a polarity which is opposite a polarity of the second pulse.
Claim 8
Dependent Claim
30 words
A system as claimed in claim 6, in which said augmenting means is arranged to supply the third pulse with an amplitude less than an amplitude of the second pulse.
Claim 9
Dependent Claim
23 words
A system as claimed in claim 1, in which said augmenting means includes limiting means for limiting an amplitude of the transient increase.
Claim 10
Dependent Claim
39 words
A system as claimed in claim 1, in which said augmenting means includes first inhibiting means for inhibiting the transient increase in response to a rate of change of the throttle position demand signal less than a predetermined rate.
Claim 11
Dependent Claim
31 words
A system as claimed in claim 5, in which said augmenting means includes second inhibiting means for inhibiting the transient increase when the difference signal is less than a predetermined value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |