US4588059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock-up clutch control system for automatic transmissions
Assignee: Aisin AW Co Ltd
•
Filing: 1982-06-21
•
Granted: 1986-05-13
•
Expires: 2002-06-21
Abstract
Abstract A lock-up clutch control system for automatic transmissions having a lock-up control valve supplied with said line and solenoid pressures in opposite fluid chambers for engaging and releasing a lock-up clutch, the lock-up control valve being constructed to satisfy the following conditions (5) and (7) ##EQU1## where A 1 is a land area of a spool for receiving the line pressure, A 2 is a land area for receiving the solenoid pressure, F is the force of a biasing spring, PL is the line pressure, and Ps is the solenoid pressure.
Inventors
- 👤 Nobuaki Miki
- 👤 Shinya Nakamura
- 👤 Kazuhiko Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:05
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/14; F16H61/143
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
Lock-up clutch control system for an automatic transmissions comprising a lock-up control valve and a solenoid valve, wherein, said solenoid valve controlled by an electric control circuit producing output signals according to operating conditions of a vehicle and supplies a solenoid pressure to said lock-up control valve, said lock-up control valve supplied with a line pressure and said solenoid pressure in opposite fluid chambers for engaging and releasing a lock-up clutch, wherein said lock-up control valve being constructed to satisfy the following conditions (5) and (7) ##EQU5## where A 1 is a land area of a spool for receiving the line pressure, A 2 is a land area for receiving the solenoid pressure, F is the force of a biasing spring and which is applied to the same direction as solenoid pressure, PL is the line pressure, and Ps is the solenoid pressure.
Claim 2
Dependent Claim
143 words
Lock-up clutch control system for an automatic transmissions comprising a lock-up control valve and a solenoid valve, wherein, said solenoid valve controlled by an electric control circuit producing output signals according to operating conditions of a vehicle and supplies a solenoid pressure to said lock-up control valve, said lock-up control valve supplied with a line pressure and said solenoid pressure in opposite fluid chambers for engaging and releasing a lock-up clutch, wherein said lock-up control valve being constructed to satisfy the following conditions (5) and (7) ##EQU5## where A 1 is a land area of a spool for receiving the line pressure, A 2 is a land area for receiving the solenoid pressure, F is the force of a biasing spring and which is applied to the same direction as solenoid pressure, PL is the line pressure, and Ps is the solenoid pressure.
Claim 3
Dependent Claim
23 words
A lock-up clutch control system in allowance with claim 1 wherein said lock-up control valve satisfies the following conditions: F<A.sub.1 ·PL(min)-A.sub.2 ·P.sub.s (min).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |