US5679092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear-shift control system of automatic transmission for motor vehicle
Assignee: Toyota Motor Corp
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Filing: 1995-10-05
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Granted: 1997-10-21
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Expires: 2015-10-05
Abstract
Abstract A gear-shift control system of an automatic transmission, in which gear shift schedule is appropriately changed-over in correspondence with the change of a road surface situation. Low-friction road surface detection device detects a low-friction road surface so as to select the gear shift schedule for the low-friction road surface adopted to start the motor vehicle with second gear. After the selection, a holding device holds the gear shift schedule for the low-friction road surface until an accelerator is pressed next.
Inventors
- 👤 Hideaki Otsubo
- 👤 Yasunori Nakawaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:09
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; F16H59/00; F16H59/50; F16H2059/506; F16H2061/0227; F16H61/68; F16H61/684; F16H61/686
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A gear-shift control system of an automatic transmission for a motor vehicle having means for detecting whether a road on which said vehicle is running has a low-friction road surface or a high-friction road surface, wherein gear shift schedule for the low-friction road surface adapted to start said motor vehicle at a high-speed gear stage is selected when the low-friction road surface is detected, whereas gear shift schedule for the high-friction road surface adapted to start said motor vehicle at a low-speed gear stage is selected when the high-friction road surface is detected, and wherein a gear shift is controlled in conformity with the selected gear-shift schedule, comprising: means for detecting a press of an accelerator pedal; and means for holding the gear shift schedule for said low-friction road surface until a next press of the accelerator pedal is detected, if said gear shift schedule for said low-friction road surface is once selected according to said detected result of the road surface.
Claim 2
Dependent Claim
162 words
A gear-shift control system of an automatic transmission for a motor vehicle having means for detecting whether a road on which said vehicle is running has a low-friction road surface or a high-friction road surface, wherein gear shift schedule for the low-friction road surface adapted to start said motor vehicle at a high-speed gear stage is selected when the low-friction road surface is detected, whereas gear shift schedule for the high-friction road surface adapted to start said motor vehicle at a low-speed gear stage is selected when the high-friction road surface is detected, and wherein a gear shift is controlled in conformity with the selected gear-shift schedule, comprising: means for detecting a press of an accelerator pedal; and means for holding the gear shift schedule for said low-friction road surface until a next press of the accelerator pedal is detected, if said gear shift schedule for said low-friction road surface is once selected according to said detected result of the road surface.
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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) | 2000-10-20 | 2001-04-21 | 2001-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-20 | 2005-04-21 | 2005-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-20 | 2009-04-21 | 2009-10-21 | $7700.00 | Window Closed / Lapsed |