Patent US4518064A successfully refreshed from Google Patents.
US4518064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch control means
Assignee: Whitnash PLC
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Filing: 1982-01-08
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Granted: 1985-05-21
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Expires: 2002-01-08
Abstract
Abstract A vehicle transmission clutch control including an electronic logic control which controls the transmission gear selection, a clutch position signal generator responsive to vehicle operating parameters to produce a command signal which operates a clutch control to govern the engagement of the clutch. A clutch disengagement control receives a gear change signal from the logic control and produces an output signal that can override the command signal to cause the control system to disengage the clutch. The output signal is caused to vary during a gear change and thereby alters the command signal and cause the clutch engagement to vary over the gear change period.
Inventors
- 👤 Harry M. Windsor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:20
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W10/00; B60W10/02; B60W10/10; B60W30/1819
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A vehicle transmission clutch control including: an electronic logic control means which is responsive to transmission operating parameters to control selection of the appropriate transmission gear ratio and which produces gear change signals to effect changes in gear ratios; a clutch position signal means responsive to vehicle operating parameters and producing a command signal; a clutch control means responsive to the command signal and which governs the state of engagement of the clutch; and a clutch disengagement control means responsive to a gear change signal from the logic control means and which produces an output signal which can override the command signal and cause the clutch control means to disengage the clutch, and said output signal is caused to vary during the gear ratio change period and thereby alter the command signal and cause the state of engagement of the clutch to vary over said period.
Claim 2
Dependent Claim
146 words
A vehicle transmission clutch control including: an electronic logic control means which is responsive to transmission operating parameters to control selection of the appropriate transmission gear ratio and which produces gear change signals to effect changes in gear ratios; a clutch position signal means responsive to vehicle operating parameters and producing a command signal; a clutch control means responsive to the command signal and which governs the state of engagement of the clutch; and a clutch disengagement control means responsive to a gear change signal from the logic control means and which produces an output signal which can override the command signal and cause the clutch control means to disengage the clutch, and said output signal is caused to vary during the gear ratio change period and thereby alter the command signal and cause the state of engagement of the clutch to vary over said period.
Claim 3
Dependent Claim
90 words
A control as claimed in claim 1, wherein the disengagement control means includes an integrator comprising: an amplifier which is connected to the logic control means via an inverting input, and which has its output connected to the command signal; and a capacitor connected across the amplifier output and said input, the disengagement control means being operated by said gear change signal which causes a change in polarity at the amplifier input, thereby causing a change in the charge in said capacitor and a subsequent change in said output signal.
Claim 4
Dependent Claim
72 words
A control as claimed in claim 2, wherein a resistance is provided in the amplifier input circuit upstream of the capacitor, and switch means are provided whereby said resistance can be switched into and out of said circuit once a predetermined change in amplifier output has taken place, thereby altering the total resistance of the capacitor charging circuit with a consequent alteration in the rate of change of charge in the capacitor.
Claim 5
Dependent Claim
25 words
A control as claimed in claim 3, wherein said switch means are a transistor sensitive to the potential difference between the amplifier input and output.
Claim 6
Dependent Claim
56 words
A control as claimed in claim 3 or claim 4 wherein said resistance comprises three resistors, namely a first resistor which is placed in a capacitor charging circuit when the gear change signal is operative, and a second and third resistor which are placed in the capacitor charging circuit when the gear change signal has ceased.
Claim 7
Dependent Claim
86 words
A control as claimed in claim 4, wherein said resistance comprises three resistors, namely, a first resistor which is placed in a capacitor charging circuit when the gear change signal is operative, and a second and third resistor which are placed in the capacitor charging circuit when the gear change signal has ceased and wherein the transistor switches one of the second and third resistors out of the capacitor charging circuit when the gear change signal has ceased and a predetermined potential difference has been reached.
References Cited (Backward Citations)
GB820395A
Cited
GB1281040A
Cited
GB1343807A
Cited
GB1377437A
Cited
GB1365036A
Cited
GB1363220A
Cited
US4195720A
Cited
US4294341A
Cited
US4281751A
Cited
US4295551A
Cited
US4373619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |