US4926716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling continuously variable transmission system
Assignee: Mitsubishi Electric Corp
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Filing: 1988-08-08
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Granted: 1990-05-22
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Expires: 2008-08-08
Abstract
Abstract A novel method of controlling a continuously variable transmission system by executing sequential steps including delivering a throttle-aperture detection signal and a vehicle-speed detection signal to a controller unit; determining an optimum objective number of engine revolution in reference to a first objective number of engine revolution set by the throttle-aperture detection signal and a second-objective number of engine revolution set by the vehicle-speed detection signal and in accordance with an instruction limiting the number of engine revolution at the shift position; and executing control of the transmission system in response to the vehicle-speed detection signal.
Inventors
- 👤 Sadayuki Hirano
- 👤 Katsuaki Murano
- 👤 Yoshinori Yamashita
- 👤 Takumi Tatsumi
- 👤 Hiroaki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:45
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/101; B60W30/00; B60W30/18; B60W30/1819; B60W30/188; F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H61/66259
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A method of controlling a continuously variable vehicle transmission which has a movable input part driven by an engine, a movable output part, and ratio control means for drivingly coupling said input part to said output part with a selected drive ratio from a range of drive ratios, said engine having speed control means for facilitating control of the speed of said engine, comprising the steps of: detecting a state of said speed control means and determining as a function thereof a first objective engine speed; detecting an actual vehicle speed and determining as a function thereof a second objective engine speed; detecting which of a plurality of states a motion control selector is in and then selecting a predetermined engine speed range corresponding to said detected state of said motion control selector; determining as a function of said first and second objective engine speeds a third objective engine speed which is within said selected engine speed range; and causing said ratio control means to vary said selected drive ratio as a function of said third objective engine speed.
Claim 2
Independent Claim
179 words
A method of controlling a continuously variable vehicle transmission which has a movable input part driven by an engine, a movable output part, and ratio control means for drivingly coupling said input part to said output part with a selected drive ratio from a range of drive ratios, said engine having speed control means for facilitating control of the speed of said engine, comprising the steps of: detecting a state of said speed control means and determining as a function thereof a first objective engine speed; detecting an actual vehicle speed and determining as a function thereof a second objective engine speed; detecting which of a plurality of states a motion control selector is in and then selecting a predetermined engine speed range corresponding to said detected state of said motion control selector; determining as a function of said first and second objective engine speeds a third objective engine speed which is within said selected engine speed range; and causing said ratio control means to vary said selected drive ratio as a function of said third objective engine speed.
Claim 3
Dependent Claim
20 words
A method of claim 1 wherein said selected engine speed range is bounded at one end by an upper limit.
Claim 4
Dependent Claim
20 words
A method of claim 1 wherein said selected engine speed range is bounded at one end by a lower limit.
Claim 5
Dependent Claim
37 words
A method of claim 1 wherein first and second said engine speed ranges respectively correspond to two of said states of said motion control selector and are respectively bounded by an upper limit and a lower limit.
Claim 6
Dependent Claim
73 words
A method of claim 1 wherein said step of causing said ratio control means to vary said selected drive ratio as a function of said third objective engine speed includes the step of determining a fourth objective engine speed which changes at a selected rate in response to changes in said third objective engine speed, said ratio control means varying said selected drive ratio as a function of said fourth objective engine speed.
Claim 7
Dependent Claim
33 words
A method of claim 5 including the step of selecting said selected rate of change for said fourth objective engine speed as a function of the detected state of said motion control selector.
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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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |