US3922933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controls for automatic transmissions
Assignee: Toyota Motor Corp
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Filing: 1974-02-25
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Granted: 1975-12-02
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Expires: 1994-02-25
Abstract
Abstract Controls for automatic transmissions in which a manual valve for effecting change of the interconnections between the passages or lines through which pressure fluid is transmitted according to given shift ranges in a hydraulic control system is enabled by shift lever means to have only one overall change-over position when the system is to operate in the forward speed region. When the shift lever is in the forward speed region shifting is automatically accomplished by the actuation of shift valves in response to signals from an electric control system without requiring manual activation of the manual valve with the shift control being automatically carried out depending on the driving condition of the vehicle.
Inventors
- 👤 Toshimitsu Sakai
- 👤 Mitsuo Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:03
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0206; F16H61/0262; F16H61/0276; F16H61/0286; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20024
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
384 words
A control system for an automotive vehicle with an automatic transmission having shiftable gear means for effecting a plurality of transmission gear ratios including a forward drive range consisting of a plurality of different forward drive gear ratios, and a hydraulic control circuit including a plurality of hydraulic servo mechanisms for shifting said gear means, said control system comprising: a manually operable valve for controlling the flow of hydraulic fluid within said hydraulic circuit, said manually operable valve being structured to effect a position for each of said transmission gear ratios other than said forward drive range gear ratios, and one position only for all of said forward drive gear ratios; manual shift lever means movable to a plurality of shift range control positions including at least one position for each of said plurality of transmission gear ratios to be effected by said transmission including each of said forward drive range gear ratios; means interconnecting said manual shift lever means with said manually operable valve to effect actuation of said valve by said shift lever means only in said one forward drive range position and in all positions other than forward drive range positions, said interconnecting means being structured to permit movement of said shift lever means to all of said forward drive range positions without displacing said manually operable valve from said one forward drive range position; shift valves for supplying fluid pressure to and exhausting fluid pressure from said hydraulic servo mechanisms to control said transmission gear ratios; an electric control circuit including signal generating means responsive to the operating conditions of said vehicle for generating electrical signals representative of said operating conditions; logic circuit means responsive to said signal generating means for emitting electrical signals corresponding to the shift ranges of said transmission upon receipt of signals from said signal generating means; and drive means operative in response to receipt of signals from said logic circuit means to control operation of said shift valves; said electrical circuit operating to effect shifting of said transmission gear ratios in accordance with the operating conditions of said vehicle for all of said gear ratios of said forward drive range in accordance with the position of said manual shift lever means when said shift lever means is in any of said forward drive range positions.
Claim 2
Dependent Claim
384 words
A control system for an automotive vehicle with an automatic transmission having shiftable gear means for effecting a plurality of transmission gear ratios including a forward drive range consisting of a plurality of different forward drive gear ratios, and a hydraulic control circuit including a plurality of hydraulic servo mechanisms for shifting said gear means, said control system comprising: a manually operable valve for controlling the flow of hydraulic fluid within said hydraulic circuit, said manually operable valve being structured to effect a position for each of said transmission gear ratios other than said forward drive range gear ratios, and one position only for all of said forward drive gear ratios; manual shift lever means movable to a plurality of shift range control positions including at least one position for each of said plurality of transmission gear ratios to be effected by said transmission including each of said forward drive range gear ratios; means interconnecting said manual shift lever means with said manually operable valve to effect actuation of said valve by said shift lever means only in said one forward drive range position and in all positions other than forward drive range positions, said interconnecting means being structured to permit movement of said shift lever means to all of said forward drive range positions without displacing said manually operable valve from said one forward drive range position; shift valves for supplying fluid pressure to and exhausting fluid pressure from said hydraulic servo mechanisms to control said transmission gear ratios; an electric control circuit including signal generating means responsive to the operating conditions of said vehicle for generating electrical signals representative of said operating conditions; logic circuit means responsive to said signal generating means for emitting electrical signals corresponding to the shift ranges of said transmission upon receipt of signals from said signal generating means; and drive means operative in response to receipt of signals from said logic circuit means to control operation of said shift valves; said electrical circuit operating to effect shifting of said transmission gear ratios in accordance with the operating conditions of said vehicle for all of said gear ratios of said forward drive range in accordance with the position of said manual shift lever means when said shift lever means is in any of said forward drive range positions.
Claim 3
Dependent Claim
83 words
A control system, according to claim 1, wherein said manual shift lever means comprises a shift lever movable by manual operation to said plurality of shift range control positions, and a shift range limiting member connected for actuation by said shift lever to control said manually operable valve in dependence upon the positions of said shift lever, said shift range limiting member and said shift lever being interconnected to effect manual actuation of said manually operable valve in one forward drive range only.
Claim 4
Dependent Claim
119 words
A control system, according to claim 2, wherein said shift lever includes a first and a second end with a pivotal connection intermediate said ends mounting said shift lever for pivotal motion thereabout, one of said ends being positioned to be manually pivotally displaced, and wherein said shift range limiting member comprises a pivotally mounted slotted member arranged to be actuated by engagement with the opposite end of said shift lever, said slotted member having defined therein an elongated slot engaging said opposite end of said shift lever, said slot being configured in such a manner that actuation of said shift range limiting member by said shift lever is permitted to one only of said forward drive range positions.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |