US3683720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmission system with time-delay circuit
Assignee: Denso Corp
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Filing: 1970-06-23
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Granted: 1972-08-15
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Expires: 1990-06-23
Abstract
Abstract An automatic transmission system wherein the amount of slip in a torque converter constituting a part of the transmission is utilized as a major factor for determining a shift point, and logic circuitry is incorporated to provide a means for this purpose and to issue a shift instruction which best suits the gear changing conditions, so that an actuator is brought into action by means of a hydraulic actuation circuit to accomplish the gear change, and a time-delay circuit is also incorporated in the said logic circuitry.
Inventors
- 👤 Hisato Wakamatsu
- 👤 Takaaki Kato
- 👤 Mamoru Kawakubo
- 👤 Katsunori Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:48
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; F16H59/00; F16H59/36; F16H61/00; F16H61/04; F16H61/06; F16H61/061; F16H61/14; F16H61/143; F16H61/68; F16H61/684; F16H61/686; F16H59/38; F16H2059/385; F16H59/42; F16H2059/425; F16H59/46; F16H2059/465; F16H2059/467
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
349 words
An automatic transmission system with a time-delay circuit comprising: a transmission having an input shaft and transmission gearing connected to a gearing shaft and being provided with a torque converter including a torque converter pump coupled to the said input shaft and a torque converter turbine coupled to the gearing shaft; friction engaging means for effecting gear changing engagements of said transmission gearing in said transmission; a hydraulic actuation circuit for controlling said friction engaging means including a shift region setting valve and a distributor valve for distributing working oil to said friction engaging means; first detecting means for producing an electrical signal proportional to the rotational speed of said torque converter input shaft; second detecting means for producing the an electrical signal proportional to the rotational speed of the gearing shaft of said transmission gearing; slip ratio operating circuit means connected to receive as inputs signals thereto the output electrical signals from said first and second detecting means so as to compute the ratio of the rotational speed of said torque converter input shaft to the rotational speed of the shaft of said transmission gearing for providing output signals only when said ratio exceeds at least one predetermined value and only when said ratio is less than at least one other predetermined value; time-delay circuit means for delaying a given one of the output signals from said operating circuit means for a predetermined time such that said given output signal is passed through said time-delay circuit means only when said given output signal has lasted longer than said predetermined time; and means including logic circuit means connected to said slip ratio operating circuit means and said time-delay circuit means for actuating said distributor valve of said hydraulic actuation circuit to change the gear changing engagements of the transmission gearing forthwith except when prevented at all because said given output signal from said time-delay circuit exists for less than said predetermined time or when that given output signal exists for more than said predetermined time and prevents said change in the gear changing engagements only during that predetermined time.
Claim 2
Dependent Claim
349 words
An automatic transmission system with a time-delay circuit comprising: a transmission having an input shaft and transmission gearing connected to a gearing shaft and being provided with a torque converter including a torque converter pump coupled to the said input shaft and a torque converter turbine coupled to the gearing shaft; friction engaging means for effecting gear changing engagements of said transmission gearing in said transmission; a hydraulic actuation circuit for controlling said friction engaging means including a shift region setting valve and a distributor valve for distributing working oil to said friction engaging means; first detecting means for producing an electrical signal proportional to the rotational speed of said torque converter input shaft; second detecting means for producing the an electrical signal proportional to the rotational speed of the gearing shaft of said transmission gearing; slip ratio operating circuit means connected to receive as inputs signals thereto the output electrical signals from said first and second detecting means so as to compute the ratio of the rotational speed of said torque converter input shaft to the rotational speed of the shaft of said transmission gearing for providing output signals only when said ratio exceeds at least one predetermined value and only when said ratio is less than at least one other predetermined value; time-delay circuit means for delaying a given one of the output signals from said operating circuit means for a predetermined time such that said given output signal is passed through said time-delay circuit means only when said given output signal has lasted longer than said predetermined time; and means including logic circuit means connected to said slip ratio operating circuit means and said time-delay circuit means for actuating said distributor valve of said hydraulic actuation circuit to change the gear changing engagements of the transmission gearing forthwith except when prevented at all because said given output signal from said time-delay circuit exists for less than said predetermined time or when that given output signal exists for more than said predetermined time and prevents said change in the gear changing engagements only during that predetermined time.
Claim 3
Dependent Claim
334 words
An automatic transmission system with a time-delay circuit comprising: a transmission having an input shaft and transmission gears having input and output shafts, said transmission being provided with a torque converter including a torque converter turbine coupled to the input shaft of said transmission gears; friction engaging means for effecting gear changing engagements of said transmission gears in said transMission; a hydraulic actuation circuit for controlling said friction engaging means including a shift region setting valve and a distributor valve for distributing working oil to said friction engaging means; first means for producing an electrical signal proportional to the rotational spaced of the input shaft of said torque converter; second means for producing an electrical signal proportional to the rotational speed of said input shaft of said transmission gears; third means for producing an electrical signal proportional to the rotational speed of said output shaft of said transmission gears; an arithmetic circuit for receiving as input signals thereto the output electrical signals from said first and second means to perform an arithmetic operation on said input signals to produce a signal indicating one of predetermined regions which corresponds to the speed ratio of the rotational speed of said torque converter input shaft to that of said transmission gear input shaft, said arithmetic circuit further receiving as its input signal the output signal from said third means and comparing it with a reference signal to produce a signal indicating the magnitude of the rotational speed of said transmission gear output shaft; a logic circuit for receiving the signal from said arithmetic circuit to perform a logical operation thereon to produce a signal for actuating said distributor valve in said hydraulic actuation circuit; and a time-delay circuit for delaying the output speed ratio signal from said arithmetic circuit corresponding to one of said predetermined regions by a predetermined time so as to pass therethrough said output speed ratio signal from said arithmetic circuit only when said output speed ratio signal lasts longer than said delay time.
Claim 4
Dependent Claim
334 words
An automatic transmission system with a time-delay circuit comprising: a transmission having an input shaft and transmission gears having input and output shafts, said transmission being provided with a torque converter including a torque converter turbine coupled to the input shaft of said transmission gears; friction engaging means for effecting gear changing engagements of said transmission gears in said transMission; a hydraulic actuation circuit for controlling said friction engaging means including a shift region setting valve and a distributor valve for distributing working oil to said friction engaging means; first means for producing an electrical signal proportional to the rotational spaced of the input shaft of said torque converter; second means for producing an electrical signal proportional to the rotational speed of said input shaft of said transmission gears; third means for producing an electrical signal proportional to the rotational speed of said output shaft of said transmission gears; an arithmetic circuit for receiving as input signals thereto the output electrical signals from said first and second means to perform an arithmetic operation on said input signals to produce a signal indicating one of predetermined regions which corresponds to the speed ratio of the rotational speed of said torque converter input shaft to that of said transmission gear input shaft, said arithmetic circuit further receiving as its input signal the output signal from said third means and comparing it with a reference signal to produce a signal indicating the magnitude of the rotational speed of said transmission gear output shaft; a logic circuit for receiving the signal from said arithmetic circuit to perform a logical operation thereon to produce a signal for actuating said distributor valve in said hydraulic actuation circuit; and a time-delay circuit for delaying the output speed ratio signal from said arithmetic circuit corresponding to one of said predetermined regions by a predetermined time so as to pass therethrough said output speed ratio signal from said arithmetic circuit only when said output speed ratio signal lasts longer than said delay time.
References Cited (Backward Citations)
US2498600A
Cited
US2529129A
Cited
US2952346A
Cited
US3267762A
Cited
US3147595A
Cited
US3448640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |