US4473143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch control means
Assignee: Whitnash PLC
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Filing: 1982-03-23
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Granted: 1984-09-25
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Expires: 2002-03-23
Abstract
Abstract An electronic control for a vehicle transmission having a clutch, the engagement of which is controlled in response to a clutch engagement signal. An electronic speed ratio logic for selection of the appropriate transmission gear ratio can produce a disengagement signal which overrides the engagement signal to cause disengagement of the clutch. A limiter is activated by a gear change signal from the logic to produce a limit signal which partially overrides the engagement signal to prevent full engagement of the clutch when the disengagement signal ceases, and the gear change signal is in operation.
Inventors
- 👤 Harry M. Windsor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:43
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/02; B60W30/00; B60W30/18; B60W30/1819; F; F16; F16H; F16H61/00; F16H61/22; F16H59/00; F16H59/74; F16H2059/746; F16H59/50; F16H59/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
In a vehicle transmission having a clutch therein: a transmission control system comprising; a clutch engagement signal generator means which produces an engagement signal for control of the clutch; a clutch control means responsive to the engagement signal; an electronic speed ratio logic for selection of an appropriate gear ratio in the transmission and which can produce a clutch disengagement signal which overrides the engagement signal to cause the clutch control means to disengage the clutch during gear changes, and which also produces a gear change signal during the gear changes; and a clutch engagement limiting means which is responsive to the gear change signal from the logic to produce a limit signal which partially overrides the engagement signal, so that during gear changes when the disengagement signal from the logic has ceased, the limit signal prevents full engagement of the clutch whilst the gear change signal is in operation.
Claim 2
Dependent Claim
150 words
In a vehicle transmission having a clutch therein: a transmission control system comprising; a clutch engagement signal generator means which produces an engagement signal for control of the clutch; a clutch control means responsive to the engagement signal; an electronic speed ratio logic for selection of an appropriate gear ratio in the transmission and which can produce a clutch disengagement signal which overrides the engagement signal to cause the clutch control means to disengage the clutch during gear changes, and which also produces a gear change signal during the gear changes; and a clutch engagement limiting means which is responsive to the gear change signal from the logic to produce a limit signal which partially overrides the engagement signal, so that during gear changes when the disengagement signal from the logic has ceased, the limit signal prevents full engagement of the clutch whilst the gear change signal is in operation.
Claim 3
Dependent Claim
55 words
A control system as claimed in claim 1, wherein a throttle position indicator produces a throttle signal indicative of throttle opening, and the limiting means receives the throttle signal and the limit signal is caused to vary with a range of throttle opening so that the greater the throttle opening the smaller the limit signal.
Claim 4
Dependent Claim
49 words
A control system as claimed in claim 2, wherein the limiting means comprises an inverting amplifier that has one input that receives the throttle signal, and has another input that is connected to a potentiometer which sets the amplifier operational voltage, and its output connected to the engagement signal.
References Cited (Backward Citations)
GB1051741A
Cited
US2940559A
Cited
GB1049924A
Cited
GB1091558A
Cited
GB1276554A
Cited
US3628642A
Cited
US3904007A
Cited
GB1449543A
Cited
US4086992A
Cited
US4294341A
Cited
US4295551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |