Patent US400229A successfully refreshed from Google Patents.
Patent US4949595A successfully refreshed from Google Patents.
US4949595A
Expired / Lapsed
US
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Line pressure control arrangement for an automatic transmission
Assignee: Nissan Motor Co Ltd
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Filing: 1989-07-31
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Granted: 1990-08-21
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Expires: 2009-07-31
Abstract
Abstract A line pressure control arrangement includes a self-adjust function which prevents the updating of the line pressure control during no-load shifts or uses different target times for no-load (power off) and positive load (power on) shifts.
Inventors
- 👤 Shigeki Shimanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:27
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/0437; F16H61/0021; F16H2061/0075; F16H2061/0087; F16H59/00; F16H59/14; F16H59/18; F16H59/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
In a power train including an engine and transmission operatively connected with said engine, said transmission including means for selectively applying line pressure to friction element of the transmission in order to select predetermined gear ratios, the arrangement comprising: line pressure self-adjust means for adjusting the level of line pressure in accordance with the difference between the time required for an upshift and a target time of said shift. means for detecting a power off upshift which occurs when the transmission undergoes an upshift with the engine operating under no load; and means for inhibiting the self-adjust function when a power off upshift takes place.
Claim 2
Dependent Claim
105 words
In a power train including an engine and transmission operatively connected with said engine, said transmission including means for selectively applying line pressure to friction element of the transmission in order to select predetermined gear ratios, the arrangement comprising: line pressure self-adjust means for adjusting the level of line pressure in accordance with the difference between the time required for an upshift and a target time of said shift. means for detecting a power off upshift which occurs when the transmission undergoes an upshift with the engine operating under no load; and means for inhibiting the self-adjust function when a power off upshift takes place.
Claim 3
Dependent Claim
19 words
An arrangement as claimed in claim 1 wherein the self-adjust amount is held unchanged during said power off upshifts.
Claim 4
Dependent Claim
31 words
An arrangement as claimed in claim 1 wherein the level of the line pressure is controlled during power off upshifts to assume the same level as induced during non-shifting transmission operation.
Claim 5
Dependent Claim
98 words
In a power train including an engine and transmission operatively connected with said engine, said transmission including means for selectively applying line pressure to friction element of the transmission in order to select predetermined gear ratios, the arrangement comprising: line pressure self-adjust means for adjusting the level of line pressure in accordance with the difference between the time required for an upshift and a target time of said shift; means for detecting a no-load upshift; means for switching the target time from a target time suitable for power on upshifts to a time suitable for power off upshifts.
Claim 6
Dependent Claim
98 words
In a power train including an engine and transmission operatively connected with said engine, said transmission including means for selectively applying line pressure to friction element of the transmission in order to select predetermined gear ratios, the arrangement comprising: line pressure self-adjust means for adjusting the level of line pressure in accordance with the difference between the time required for an upshift and a target time of said shift; means for detecting a no-load upshift; means for switching the target time from a target time suitable for power on upshifts to a time suitable for power off upshifts.
References Cited (Backward Citations)
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |