Patent US4885960A successfully refreshed from Google Patents.
US4885960A
Expired / Lapsed
US
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Control system for automatic transmission
Assignee: Aisin Corp
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Filing: 1988-08-31
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Granted: 1989-12-12
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Expires: 2008-08-31
Abstract
Abstract A creep phenomenon of an automotive vehicle is prevented by an arrangement which is provided with an anti-creep mode which is operative to change the gear automatically to a speed range having a relatively low speed reduction ratio when the vehicle is at rest. A double engagement within the transmission and resulting oscillations which would occur when a special operation is performed is prevented. At this end, a time delay is provided before shifting to the anti-creep mode when the vehicle is at rest and the throttle valve opening of an engine is equal to or less than a given value.
Inventors
- 👤 Hiroaki Maeda
- 👤 Masahiko Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:29
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/20; F16H59/00; F16H59/14; F16H59/18; F16H59/22; F16H59/36; F16H59/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
A control system for an automatic transmission including a transmission mechanism interposed between a drive source which is disposed onboard a vehicle and a drive output shaft and in which the transmission mechanism is automatically shifted to a second speed range other than first speed range which has a maximum speed reduction ratio when the vehicle is substantially at rest and the drive source is energized at a level equal to or less than a given level; the control system comprising first detecting means for detecting whether the vehicle is substantially at rest, second detecting means for detecting the level at which the drive source is energized, and electronic control means for inhibiting a shaft to the second speed range when the vehicle is substantially at rest and the energization level of the drive source has been recognized to be equal to or less than a given value until after a given time interval passes, said time interval being equal to or larger than a time required for performing a restoring operation from a torsional deformation which is produced within the transmission mechanism.
Claim 2
Dependent Claim
183 words
A control system for an automatic transmission including a transmission mechanism interposed between a drive source which is disposed onboard a vehicle and a drive output shaft and in which the transmission mechanism is automatically shifted to a second speed range other than first speed range which has a maximum speed reduction ratio when the vehicle is substantially at rest and the drive source is energized at a level equal to or less than a given level; the control system comprising first detecting means for detecting whether the vehicle is substantially at rest, second detecting means for detecting the level at which the drive source is energized, and electronic control means for inhibiting a shaft to the second speed range when the vehicle is substantially at rest and the energization level of the drive source has been recognized to be equal to or less than a given value until after a given time interval passes, said time interval being equal to or larger than a time required for performing a restoring operation from a torsional deformation which is produced within the transmission mechanism.
Claim 3
Dependent Claim
36 words
A control system according to claim 1 in which the first detecting means comprises means for detecting a vehicle speed, and the second detecting means comprises means for detecting a throttle opening of the drive source.
Claim 4
Dependent Claim
40 words
A control device according to claim 1 in which said control means returns the transmission mechanism to the first speed range automatically when the energization level of the drive source changes to a second level higher than the first level.
Claim 5
Dependent Claim
36 words
A control system according to claim 3 in which the first detecting means comprises means for detecting a vehicle speed, and the second detecting means comprises means for detecting a throttle opening of the drive source.
References Cited (Backward Citations)
US4513638A
Cited
US4513639A
Cited
JPS60354A
Cited
JPS60347A
Cited
US4653622A
Cited
US4644826A
Cited
US4648289A
Cited
US4694709A
Cited
US4730708A
Cited
US4784020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |