Patent US3895547A successfully refreshed from Google Patents.
US3895547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission control system
Assignee: Aisin Corp
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Filing: 1974-07-25
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Granted: 1975-07-22
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Expires: 1994-07-25
Abstract
Abstract A transmission control system for vehicles includes a governor valve, a throttle valve, a shift valve for automatically engaging and disengaging the clutches and brakes, and a modulator valve for controlling the fluid communication between the throttle and shift valves, whereby the throttle pressure generated by the throttle valve is transmitted directly to the shift valve from the throttle valve, within a predetermined throttle pressure range which corresponds to the degree to which the engine throttle is opened, and which may then be varied by means of the modulator valve when the throttle pressure is above a predetermined throttle pressure or value.
Inventors
- 👤 Noboru Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:10
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H61/0276; F16H61/029; F16H61/0265; F16H61/0267
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
261 words
A transmission control system for a vehicle, comprising: a hydraulic fluid pressure source; fluid pressure regulator means for regulating the pressure of said hydraulic fluid from said fluid pressure source to a particular line pressure; a plurality of frictional engaging means actuated by said line pressure from said fluid pressure regulator means for attaining a particular gear ratio within the gear trains of said transmission; a governor valve for generating a governor pressure which is increased or decreased in response to the speed of said vehicle; a manual shift valve operatively connected to said fluid pressure regulator means for selectively supplying said line pressure to either of said plurality of frictional engaging means; a throttle valve fluidically connected to said manual shift valve for generating a throttle pressure reponsive to the degree to which the engine throttle valve is opened; a shift valve fluidically connected to said manual shift valve and actuated in response to said governor pressure and said throttle pressure for automatically selectively actuating said plurality of frictional engaging means; a hydraulic conduit for connecting said throttle valve to said shift valve; and a modulator valve disposed within said hydraulic conduit and actuated in response to said throttle pressure, whereby said throttle valve and said shift valve are fluidically communicated with each other in order to supply said throttle pressure directly to said shift valve when said throttle pressure is below a predetermined value, and to supply said throttle pressure to said shift valve with a different rate of increase when said throttle pressure is above said predetermined value.
Claim 2
Dependent Claim
261 words
A transmission control system for a vehicle, comprising: a hydraulic fluid pressure source; fluid pressure regulator means for regulating the pressure of said hydraulic fluid from said fluid pressure source to a particular line pressure; a plurality of frictional engaging means actuated by said line pressure from said fluid pressure regulator means for attaining a particular gear ratio within the gear trains of said transmission; a governor valve for generating a governor pressure which is increased or decreased in response to the speed of said vehicle; a manual shift valve operatively connected to said fluid pressure regulator means for selectively supplying said line pressure to either of said plurality of frictional engaging means; a throttle valve fluidically connected to said manual shift valve for generating a throttle pressure reponsive to the degree to which the engine throttle valve is opened; a shift valve fluidically connected to said manual shift valve and actuated in response to said governor pressure and said throttle pressure for automatically selectively actuating said plurality of frictional engaging means; a hydraulic conduit for connecting said throttle valve to said shift valve; and a modulator valve disposed within said hydraulic conduit and actuated in response to said throttle pressure, whereby said throttle valve and said shift valve are fluidically communicated with each other in order to supply said throttle pressure directly to said shift valve when said throttle pressure is below a predetermined value, and to supply said throttle pressure to said shift valve with a different rate of increase when said throttle pressure is above said predetermined value.
Claim 3
Dependent Claim
115 words
A transmission control system as set forth in claim 1 wherein said modulator valve comprises: a valve spool having two land means to control fluid communication between said throttle valve and said shift valve; a first spring normally biasing said valve spool in the direction wherein said valve spool permits said fluid communication to be established; and a movable plug normally separated from said valve spool by means of said first spring and a second spring and which is moved against the biasing forces of said springs so as to establish a force having a value greater than a predetermined valuE of said throttle pressure, whereby a regulated pressure is supplied to said shift valve.
Claim 4
Dependent Claim
62 words
A transmission control system as set forth in claim 1, wherein: a relay valve is interposed between said modulator valve and said manual shift valve within said hydraulic conduit; said relay valve including a valve spool and a spring biasing said relay valve spool, whereby a regulated pressure above a predetermined value of said throttle pressure is supplied to said modulator valve.
Claim 5
Dependent Claim
138 words
A transmission control system as set forth in claim 2, wherein said modulator valve comprises: a hydraulic chamber defined between said two lands of said valve spool; a drain port normally closed by one of said lands of said valve spool and adapted to be opened so as to be in fluidic communication with said hydraulic chamber when said valve spool is moved in response to a pressure having a value above a predetermined value of said throttle pressure; said throttle pressure also being applied to said plug so as to move said plug in the direction wherein the force of said first and second springs is added; and said regulated pressure also being applied to said valve spool so as to move said spool so as to thereby counteract the force of said first and second springs.
Claim 6
Dependent Claim
64 words
A transmission control system as set forth in claim 4, wherein: said modulator valve further includes stopper means with which one end of said second spring is engaged, whereby the movement of said plug in response to said throttle pressure is limited and the regulated pressure to be applied to said shift valve is made constant above a predetermined value of said throttle pressure.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |