US5035159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift control system for automatic transmission
Assignee: Nissan Motor Co Ltd
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Filing: 1989-06-30
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Granted: 1991-07-30
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Expires: 2009-06-30
Abstract
Abstract A shift control system for an automatic transmission is disclosed, in which the servo activating pressure modulating means, modulating the servo activating pressure during a period of shifting in response to signal from the signal generating means, sets the shift feel in accordance with a command to the shift feel modulating means manually made by a driver. Further, the shift feel can also be set in accordance with the driver's command by modulating output torque of the engine during a period of shifting in response to the signal. Furthermore, upon modulating the shift feel, more remarkable modulation thereof is obtained by also modulating a shift point of the automatic transmission by the shift point modulating means.
Inventors
- 👤 Takashi Shibayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:45
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W10/00; B60W10/04; B60W10/10; B60W10/11; B60W30/1819; F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; F16H61/04; F16H61/0437; F16H59/00; F16H59/02; F16H59/08; F16H2059/082; F16H2302/00; F16H2302/04; F16H63/00; F16H63/40; F16H63/50; F16H63/502
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A shift control system for an automatic transmission for a vehicle having an engine, the automatic transmission selecting a shifting stage by selectively hydraulically operating a plurality of friction elements by a servo activating pressure, comprising: manually operable means for modulating a demand for a shift feel and for generating a signal; means for selecting one of a plurality of values of the servo activating pressure in response to said signal; and means for controlling the servo activating pressure in accordance with said one of said plurality of values selected.
Claim 2
Dependent Claim
90 words
A shift control system for an automatic transmission for a vehicle having an engine, the automatic transmission selecting a shifting stage by selectively hydraulically operating a plurality of friction elements by a servo activating pressure, comprising: manually operable means for modulating a demand for a shift feel and for generating a signal; means for selecting one of a plurality of values of the servo activating pressure in response to said signal; and means for controlling the servo activating pressure in accordance with said one of said plurality of values selected.
Claim 3
Dependent Claim
25 words
A shift control for an automatic transmission as defined in claim 1, further comprising means for modulating a shift point in response to said signal.
Claim 4
Dependent Claim
19 words
A shift control system as defined in claim 1, wherein said manually operable means include a shift feel switch.
Claim 5
Dependent Claim
36 words
A shift control system as defined in claim 1, wherein said servo activating pressure value selecting means include a servo activating pressure control circuit, and said servo activating pressure controlling means include a pressure control valve.
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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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |