US3695122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for an automotive automatic power transmission
Assignee: Nissan Motor Co Ltd
•
Filing: 1970-10-13
•
Granted: 1972-10-03
•
Expires: 1990-10-13
Abstract
Abstract A control system for controlling the line pressure in a hydraulic control system of an automotive automatic power transmission, in which a line pressure regulator valve is controlled by a variable back pressure produced by a fluid jet nozzle which is electrically controlled in response to a variation in the vehicle speed, whereby a cutback is rapidly effected in the line pressure to effect a smooth shifting between the gear ratios.
Inventors
- 👤 Namio Irie
- 👤 Ichimura Hirohisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/0021; F16H59/00; F16H59/36; F16H59/38; F16H2059/385; F16H61/02; F16H61/0202; F16H61/0251; F16H2061/026; F16H61/04; F16H61/0437
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
203 words
A control system for controlling a line pressure in a hydraulic control system for an automatic power transmission of a motor vehicle driven by an internal combustion engine, comprising, in combination, a line pressure regulator valve provided in said hydraulic control system for regulating the line pressure therein, a fluid jet nozzle connected to said regulator valve, a first sensing means operatively connected to the driven shaft of said transmission to sense vehicle speed for generating a first voltage signal corresponding thereto, a second sensing means operatively connected to the intake manifold of the engine to sense an output torque of the engine for generating a second voltage signal corresponding thereto, an electronic control circuit electrically connected to said first and second sEnsing means for producing a cutback signal in response to said first and second voltage signals, and an electronic actuating means electrically connected to said electronic control circuit and having a movable member movable toward and away from said fluid jet nozzle, said electronic actuating means being responsive to said cutback signal to cause said movable member to close said fluid jet nozzle for thereby producing a back pressure to effect a cutback in said line pressure through said regulator valve.
Claim 2
Dependent Claim
203 words
A control system for controlling a line pressure in a hydraulic control system for an automatic power transmission of a motor vehicle driven by an internal combustion engine, comprising, in combination, a line pressure regulator valve provided in said hydraulic control system for regulating the line pressure therein, a fluid jet nozzle connected to said regulator valve, a first sensing means operatively connected to the driven shaft of said transmission to sense vehicle speed for generating a first voltage signal corresponding thereto, a second sensing means operatively connected to the intake manifold of the engine to sense an output torque of the engine for generating a second voltage signal corresponding thereto, an electronic control circuit electrically connected to said first and second sEnsing means for producing a cutback signal in response to said first and second voltage signals, and an electronic actuating means electrically connected to said electronic control circuit and having a movable member movable toward and away from said fluid jet nozzle, said electronic actuating means being responsive to said cutback signal to cause said movable member to close said fluid jet nozzle for thereby producing a back pressure to effect a cutback in said line pressure through said regulator valve.
Claim 3
Dependent Claim
29 words
A control system according to claim 1, wherein said first voltage signal increases as the vehicle speed decreases and wherein said second signal increases as the engine torque decreases.
Claim 4
Dependent Claim
29 words
A control system according to claim 1, wherein said first voltage signal increases as the vehicle speed decreases and wherein said second signal increases as the engine torque decreases.
Claim 5
Dependent Claim
26 words
A control system according to claim 2, wherein said cutback signal is produced when said first and second voltage signals become lower than a predetermined value.
Claim 6
Dependent Claim
50 words
A control system according to claim 1, wherein said line pressure regulator valve is connected to a throttle valve producing a throttle pressure in relation to the output torque of the engine, said throttle pressure being applied to said line pressure regulator valve to effect a cutback in line pressure.
Claim 7
Dependent Claim
37 words
A control system according to claim 1, wherein said electronic actuating means is controlled in response to the vehicle speed and engine torque to raise a cutback point to a higher level as the engine torque increases.
Claim 8
Dependent Claim
37 words
A control system according to claim 1, wherein said electronic control circuit comprises a Schmidt trigger circuit including a plurality of transistors, resistors and diodes adapted to effect ''''ON'''' and ''''OFF'''' operations for generating a cutback signal.
References Cited (Backward Citations)
US3505909A
Cited
US3572168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |