US3748929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable power train and control
Assignee: Motors Liquidation Co
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Filing: 1971-05-17
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Granted: 1973-07-31
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Expires: 1991-05-17
Abstract
Abstract A power train and control therefor including an engine driven transmission selectively shiftable to a plurality of forward drive positions and a reverse drive position and a neutral drive position. The transmission control includes a manual shift valve which directs fluid pressure from an engine driven pump to the transmission friction drive engaging devices. This manual control valve is movable to a plurality of drive conditions including a neutral condition. A heat sensor is placed in the engine exhaust manifold to determine the temperature of the exhaust gas from the engine. When the engine stalls, the exhaust gas temperature will decrease rapidly which decrease in temperature is detected electronically to control a shift lock control valve which directs fluid pressure from the pump to a locking member located adjacent the manual shift valve which will prevent shifting of the manual valve from the drive or reverse to the neutral position. The shift lock control also directs fluid pressure from the transmission governor to the transmission control to assist in automatic shifting. When the engine is stalled the governor pressure directed to the shift lock control is blocked and replaced with line pressure to prevent automatic shift changes from occurring in the transmission.
Inventors
- 👤 L Green
- 👤 A Arbor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:04
CPC Classifications
F; F16; F16H; F16H59/00; F16H59/74; F16H59/78; F16H61/00; F16H61/16; F16H59/02; F16H59/08; F16H61/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
A power train and control comprising, engine means having an exhaust manifold, heat sensing means for sensing the temperature of said exhaust manifold; transmission means drivingly connected with said engine for establishing a plurality of forward drives and a reverse drive and a neutral condition; and control means for selectively controlling the establishment of the forward and reverse drives and the neutral condition including a source of fluid pressure, manual valve means in fluid communication with said source and being movable to a plurality of positions including a drive position and a reverse position and a neutral position, shift lock control means operatively connected with said manual valve means, and control valve means for directing fluid pressure from said source to said shift lock control means to operate said shift lock control means to prevent shifting of said manual valve means from the drive position or reverse position to the neutral position when the temperature of the exhaust manifold is below a predetermined value.
Claim 2
Dependent Claim
164 words
A power train and control comprising, engine means having an exhaust manifold, heat sensing means for sensing the temperature of said exhaust manifold; transmission means drivingly connected with said engine for establishing a plurality of forward drives and a reverse drive and a neutral condition; and control means for selectively controlling the establishment of the forward and reverse drives and the neutral condition including a source of fluid pressure, manual valve means in fluid communication with said source and being movable to a plurality of positions including a drive position and a reverse position and a neutral position, shift lock control means operatively connected with said manual valve means, and control valve means for directing fluid pressure from said source to said shift lock control means to operate said shift lock control means to prevent shifting of said manual valve means from the drive position or reverse position to the neutral position when the temperature of the exhaust manifold is below a predetermined value.
Claim 3
Dependent Claim
193 words
A power train and control comprising, engine means having an exhaust manifold, heat sensing means for sensing the temperature of said exhaust manifold; transmission means drivingly connected with said engine means for establishing a plurality of forward drive ratios and a reverse drive and a neutral condition; and control means for selectively controlling the establishment of the forward and reverse drives and the neutral condition including a source of fluid pressure; governor pressure source for controlling automatic ratio change, manual valve means in fluid communication with said source and being movable to a plurality of positions including a drive position and a reverse position and a neutral position, shift lock control means operatively connected with said manual valve means, and control valve means for substituting pressure from said source for pressure from said governor pressure source to prevent automatic ratio change and for directing fluid pressure from said source to said shift lock control means to operate said shift lock control means to prevent shifting of said manual valve means from the drive position or reverse position to the neutral position when the temperature of the exhaust manifold is below a predetermined value.
Claim 4
Dependent Claim
193 words
A power train and control comprising, engine means having an exhaust manifold, heat sensing means for sensing the temperature of said exhaust manifold; transmission means drivingly connected with said engine means for establishing a plurality of forward drive ratios and a reverse drive and a neutral condition; and control means for selectively controlling the establishment of the forward and reverse drives and the neutral condition including a source of fluid pressure; governor pressure source for controlling automatic ratio change, manual valve means in fluid communication with said source and being movable to a plurality of positions including a drive position and a reverse position and a neutral position, shift lock control means operatively connected with said manual valve means, and control valve means for substituting pressure from said source for pressure from said governor pressure source to prevent automatic ratio change and for directing fluid pressure from said source to said shift lock control means to operate said shift lock control means to prevent shifting of said manual valve means from the drive position or reverse position to the neutral position when the temperature of the exhaust manifold is below a predetermined value.
Claim 5
Dependent Claim
142 words
A transmission and control comprising a plurality of fluid controlled selectively engageable drive ratios and a neutral drive condition; a source of fluid pressure for supplying fluid to control said drive ratios; governor means in fluid communication with said source for delivering a governor pressure to the control for controlling automatic ratio changes of said drive ratios; manual valve means in fluid communication with said source and being movable to a drive and neutral position for controlling manual shifting of the transmission; and control means responsive to a source of engine temperature including valve means for interchanging said source pressure and governor pressure to the control to prevent automatic ratio changes, and lock means responsive to said valve means for preventing movement of said manual valve means from the drive to neutral position when the engine temperature is below a predetermined value.
Claim 6
Dependent Claim
142 words
A transmission and control comprising a plurality of fluid controlled selectively engageable drive ratios and a neutral drive condition; a source of fluid pressure for supplying fluid to control said drive ratios; governor means in fluid communication with said source for delivering a governor pressure to the control for controlling automatic ratio changes of said drive ratios; manual valve means in fluid communication with said source and being movable to a drive and neutral position for controlling manual shifting of the transmission; and control means responsive to a source of engine temperature including valve means for interchanging said source pressure and governor pressure to the control to prevent automatic ratio changes, and lock means responsive to said valve means for preventing movement of said manual valve means from the drive to neutral position when the engine temperature is below a predetermined value.
Claim 7
Dependent Claim
94 words
A transmission and control comprising a drive train having a plurality of controlled devices for selectively establishing a plurality of drive ratios and a neutral drive condition; shift control means for selectively operating said controlled devices for selectively establishing said drive ratios and a neutral drive condition and control means responsive to a source of engine temperature operatively connected to said shift control means operative in response to an engine temperature characteristic indicating that the engine power output has experienced an unscheduled loss to overcontrol said shift control means to inhibit shifting to neutral.
Claim 8
Dependent Claim
94 words
A transmission and control comprising a drive train having a plurality of controlled devices for selectively establishing a plurality of drive ratios and a neutral drive condition; shift control means for selectively operating said controlled devices for selectively establishing said drive ratios and a neutral drive condition and control means responsive to a source of engine temperature operatively connected to said shift control means operative in response to an engine temperature characteristic indicating that the engine power output has experienced an unscheduled loss to overcontrol said shift control means to inhibit shifting to neutral.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |