Patent US4807496A successfully refreshed from Google Patents.
US4807496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for alleviating shock in automatic transmission
Assignee: Nissan Motor Co Ltd
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Filing: 1987-11-16
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Granted: 1989-02-28
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Expires: 2007-11-16
Abstract
Abstract An accumulator designed to alleviate a so-called N-D select shock is connected in a hydraulic control system for an automatic transmission such that it can also alleviate a 3-4 shift shock. The hydraulic control system includes a solenoid that controls a first hydraulic fluid pressure which is variable in a first pattern, a pressure modifier valve that changes the first pattern of variation of the first hydraulic fluid pressure to a second pattern and generates a second hydraulic fluid pressure variable in a second pattern, and a pressure regulator that is responsive to the second hydraulic fluid pressure to generate a third hydraulic fluid pressure that varies in response to the second hydraulic fluid pressure.
Inventors
- 👤 Koichi Hayasaki
- 👤 Kazuhiko Sugano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:31
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/06; F16H61/065; F16H61/067; F16H61/02; F16H61/0202; F16H61/0251; F16H2061/026; F16H2061/0488; F16H59/00; F16H59/68; F16H59/70; F16H61/061; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2663
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A hydraulic system, comprising: a solenoid; first means for generating a first hydraulic fluid pressure controllable by the solenoid, said first hydraulic fluid pressure being variable in a first pattern; pressure modifier valve means for changing said first pattern of variation of said first hydraulic fluid pressure to a second pattern and generating a second hydraulic fluid pressure variable in said second pattern; and pressure regulator means responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure.
Claim 2
Dependent Claim
90 words
A hydraulic system, comprising: a solenoid; first means for generating a first hydraulic fluid pressure controllable by the solenoid, said first hydraulic fluid pressure being variable in a first pattern; pressure modifier valve means for changing said first pattern of variation of said first hydraulic fluid pressure to a second pattern and generating a second hydraulic fluid pressure variable in said second pattern; and pressure regulator means responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure.
Claim 3
Dependent Claim
49 words
A hydraulic system as claimed in claim 1, wherein said pressure modifier valve means includes a spool having a first pressure acting area exposed to said second hydraulic pressure, a second pressure acting area exposed to said first hydraulic fluid pressure, and a spring means for biasing said spool.
Claim 4
Dependent Claim
172 words
A hydraulic system comprising: a solenoid; first means for generating a first hydraulic fluid pressure controllable by the solenoid; pressure modifier valve means for generating a second hydraulic fluid pressure; and pressure regulator means responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure; said pressure modifier valve means being operatively connected to said first means such that said second hydraulic fluid pressure is variable in response to said first hydraulic fluid pressure, wherein said pressure modifier valve means includes a spool having a first pressure acting area exposed to said second hydraulic fluid pressure, a second pressure acting area exposed to said first hydraulic fluid pressure, and a spring means for biasing said spool, and said spool of said pressure modifier valve means is urged by said second hydraulic fluid pressure in a first direction against said spring means, but urged by said first hydraulic fluid pressure in a second direction which is opposite to said first direction.
Claim 5
Dependent Claim
172 words
A hydraulic system comprising: a solenoid; first means for generating a first hydraulic fluid pressure controllable by the solenoid; pressure modifier valve means for generating a second hydraulic fluid pressure; and pressure regulator means responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure; said pressure modifier valve means being operatively connected to said first means such that said second hydraulic fluid pressure is variable in response to said first hydraulic fluid pressure, wherein said pressure modifier valve means includes a spool having a first pressure acting area exposed to said second hydraulic fluid pressure, a second pressure acting area exposed to said first hydraulic fluid pressure, and a spring means for biasing said spool, and said spool of said pressure modifier valve means is urged by said second hydraulic fluid pressure in a first direction against said spring means, but urged by said first hydraulic fluid pressure in a second direction which is opposite to said first direction.
Claim 6
Dependent Claim
126 words
A hydraulic system, comprising: a source of hydraulic fluid; pilot valve means for generating a constant hydraulic fluid pressure; a solenoid; first means communicating with said pilot valve means for generating a first hydraulic fluid pressure controllable by the solenoid, said first hydraulic fluid pressure being variable in a first pattern; pressure modifier valve means communicating with said pilot valve means for changing said first pattern of variation of said first hydraulic fluid pressure to a second pattern and generating a second hydraulic fluid pressure variable in said second pattern; and pressure regulator valve means communicating with said source of hydraulic fluid and responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure.
Claim 7
Dependent Claim
126 words
A hydraulic system, comprising: a source of hydraulic fluid; pilot valve means for generating a constant hydraulic fluid pressure; a solenoid; first means communicating with said pilot valve means for generating a first hydraulic fluid pressure controllable by the solenoid, said first hydraulic fluid pressure being variable in a first pattern; pressure modifier valve means communicating with said pilot valve means for changing said first pattern of variation of said first hydraulic fluid pressure to a second pattern and generating a second hydraulic fluid pressure variable in said second pattern; and pressure regulator valve means communicating with said source of hydraulic fluid and responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure.
Claim 8
Dependent Claim
33 words
A hydraulic system as claimed in claim 4, wherein said pilot valve means communicates with said pressure regulator valve means for regulating said third fluid pressure to generate said constant hydraulic fluid pressure.
Claim 9
Dependent Claim
48 words
A hydraulic system as claimed in claim 5, wherein said pressure modifier valve includes a spool having a first pressure acting area exposed to said second hydraulic pressure, a second pressure acting area exposed to said first hydraulic fluid pressure, and a spring means for biasing said spool.
Claim 10
Dependent Claim
231 words
A hydraulic system comprising; a source of hydraulic fluid; pilot valve means for generating a constant hydraulic fluid pressure; a solenoid; first means communicating with said pilot valve means for generating a first hydraulic fluid pressure controllable by the solenoid; pressure modifier valve means communicating with said pilot valve means for generating a second hydraulic fluid pressure; and pressure regulator valve means communicating with said source of hydraulic fluid and responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure; said pressure modifier valve manes being operatively connected to said first means such that said second hydraulic fluid pressure is variable in response to said first hydraulic fluid pressure; wherein said pilot valve means communicates with said pressure regulator valve means for regulating said third fluid pressure to generate said constant hydraulic fluid pressure; said pressure modifier valve includes a spool having a first pressure acting area exposed to said second hydraulic fluid pressure; a second pressure acting area exposed to said first hydraulic fluid pressure, and a spring means for biasing said spool; and said spool of said pressure modifier valve means is urged by said second hydraulic fluid pressure in a first direction against said spring means, but urged by said first hydraulic fluid pressure in a second direction which is opposite to said first direction.
Claim 11
Dependent Claim
231 words
A hydraulic system comprising; a source of hydraulic fluid; pilot valve means for generating a constant hydraulic fluid pressure; a solenoid; first means communicating with said pilot valve means for generating a first hydraulic fluid pressure controllable by the solenoid; pressure modifier valve means communicating with said pilot valve means for generating a second hydraulic fluid pressure; and pressure regulator valve means communicating with said source of hydraulic fluid and responsive to said second hydraulic fluid pressure for generating a third hydraulic fluid pressure variable in response to said second hydraulic fluid pressure; said pressure modifier valve manes being operatively connected to said first means such that said second hydraulic fluid pressure is variable in response to said first hydraulic fluid pressure; wherein said pilot valve means communicates with said pressure regulator valve means for regulating said third fluid pressure to generate said constant hydraulic fluid pressure; said pressure modifier valve includes a spool having a first pressure acting area exposed to said second hydraulic fluid pressure; a second pressure acting area exposed to said first hydraulic fluid pressure, and a spring means for biasing said spool; and said spool of said pressure modifier valve means is urged by said second hydraulic fluid pressure in a first direction against said spring means, but urged by said first hydraulic fluid pressure in a second direction which is opposite to said first direction.
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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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |