US4996893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed change control device in automatic transmission for automobile
Assignee: Exedy Corp
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Filing: 1988-12-09
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Granted: 1991-03-05
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Expires: 2008-12-09
Abstract
Abstract A speed change control device in an automatic transmission for an automobile (16) equipped with a storage means (3) storing a correlation between an accelerator opening and a vehicle speed by which a shifting in each speed stage is commenced, and its shift point being deviated so as to execute a shift-up operation at a constant high vehicle speed when an accelerator opening is smaller than or equal to a specified value. An accelerator opening rate-of-change computing means (14) computes a rate-of-change of an accelerator opening on the basis of a detection signal from an accelerator opening detector (12) detecting the accelerator opening. Further, a shift-up prohibiting means (15) prohibits a shift-up operation when the accelerator opening rate-of-change computed by the accelerator opening rate-of-change computing means (14) is more than or equal to a specified value.
Inventors
- 👤 Katsuma Nakamura
- 👤 Hirofumi Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:09
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; F16H59/00; F16H59/14; F16H59/141; F16H59/24; F16H59/36; F16H59/44; F16H61/10; F16H61/16; Y; Y10; Y10S; Y10S477/00; Y10S477/904; Y10S477/905
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A speed change control device in an automatic transmission for an automobile equipped with a storage means for storing a correlation between an accelerator opening an a vehicle speed by which a shifting in each speed stage is commenced, said device comprising an accelerator opening rate-of-change computing means for computing a rate-of-change of an accelerator opening on the basis of a detection signal from an accelerator opening detector for detecting the accelerator opening and a shift-up prohibiting means for prohibiting a shift-up operation when the accelerator opening rate-of-change computed by the accelerator opening rate-of-change computing means is more than or equal to a specified value, and at the same time the correlation between the accelerator opening and the vehicle speed in said storage means is preset in such a manner that a shift point is deviated so as to execute the shift-up operation at a constant vehicle speed when the accelerator opening is smaller than or equal to a specified value, said constant vehicle speed being higher than a vehicle speed at which shift-up occurs when the accelerator opening is larger than said specified value.
Claim 2
Dependent Claim
185 words
A speed change control device in an automatic transmission for an automobile equipped with a storage means for storing a correlation between an accelerator opening an a vehicle speed by which a shifting in each speed stage is commenced, said device comprising an accelerator opening rate-of-change computing means for computing a rate-of-change of an accelerator opening on the basis of a detection signal from an accelerator opening detector for detecting the accelerator opening and a shift-up prohibiting means for prohibiting a shift-up operation when the accelerator opening rate-of-change computed by the accelerator opening rate-of-change computing means is more than or equal to a specified value, and at the same time the correlation between the accelerator opening and the vehicle speed in said storage means is preset in such a manner that a shift point is deviated so as to execute the shift-up operation at a constant vehicle speed when the accelerator opening is smaller than or equal to a specified value, said constant vehicle speed being higher than a vehicle speed at which shift-up occurs when the accelerator opening is larger than said specified value.
Claim 3
Dependent Claim
34 words
A speed change control device in an automatic transmission for an automobile as set forth in claim 1, further comprising a microcomputer controlling said accelerator opening rate-of-change computing means and said shift-up prohibiting means.
Claim 4
Dependent Claim
42 words
A speed change control device in an automatic transmission for an automobile as set forth in any one of claim 1 or claim 2, further comprising a power/economy switch means changing a drive mode between a power mode and an economy mode.
Claim 5
Dependent Claim
52 words
A speed change control device in an automatic transmission for an automobile as set forth in claim 3, in which the accelerator opening rate-of-change computing means and the shift-up prohibiting means function when the power mode is selected by the power/economy switch means and a D-range is selected by a select lever.
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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) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |