US4622865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling continuously variable transmission when accelerating from low speeds
Assignee: Toyota Motor Corp
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Filing: 1984-07-11
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Granted: 1986-11-18
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Expires: 2004-07-11
Abstract
Abstract An apparatus for controlling an continuously variable transmission (CVT) used for a power transmission system of a vehicle. The CVT is controlled such that an actual engine speed becomes a desired engine speed. The desired engine speed is set as a function of running parameter such as intake throttle position. When the CVT is controlled in the same way as at the steady state of the vehicle at the acceleration of the vehicle, the acceleration performance is degraded. Thus, according to the present invention, the speed ratio of the CVT is reduced when the acceleration of the vehicle is small, in spite of the requisition of the vehicle acceleration. As a result, satisfactory drivability is attained.
Inventors
- 👤 Hiroshi Itoh
- 👤 Mitsuru Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:22
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; B; B60; B60W; B60W10/00; B60W10/04; B60W10/10; B60W10/101; B60W30/00; B60W30/18; B60W30/1819; F16H61/662; F16H61/66254; F16H61/66259; F16H59/00; F16H59/14; F16H2059/142
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
An apparatus for controlling a continuously variable transmission including a desired engine speed setting means (70) for setting the desired engine speed as a function of running parameter and a control means (78) for controlling a continuously variable transmission (4) such that an actual engine speed becomes a desired engine speed, comprising: an acceleration requisition detecting means (74) for detecting the requisition of vehicle acceleration; an acceleration detecting means (72) for detecting the vehicle acceleration; and a speed ratio reducing means (76) for reducing the speed ratio of the continuously variable transmission when the vehicle acceleration is small while the vehicle acceleration is demanded.
Claim 2
Independent Claim
104 words
An apparatus for controlling a continuously variable transmission including a desired engine speed setting means (70) for setting the desired engine speed as a function of running parameter and a control means (78) for controlling a continuously variable transmission (4) such that an actual engine speed becomes a desired engine speed, comprising: an acceleration requisition detecting means (74) for detecting the requisition of vehicle acceleration; an acceleration detecting means (72) for detecting the vehicle acceleration; and a speed ratio reducing means (76) for reducing the speed ratio of the continuously variable transmission when the vehicle acceleration is small while the vehicle acceleration is demanded.
Claim 3
Dependent Claim
38 words
An apparatus for controlling a continuously variable transmission as defined in claim 1, wherein said speed ratio reducing means (76) includes a desired engine speed correcting means for reducing the speed ratio by increasing the desired engine speed.
Claim 4
Dependent Claim
36 words
An apparatus for controlling a continuously variable transmission as defined in claim 2, wherein said desired engine speed correcting means increases the desired engine speed by a predetermined increment until acceleration of the vehicle is enlarged.
Claim 5
Dependent Claim
35 words
An apparatus for controlling a continuously variable transmission as defined in claim 1, wherein said acceleration detecting means (72) detects the requisition of vehicle acceleration from comparison of intake throttle position with a predetermined value.
Claim 6
Dependent Claim
38 words
An apparatus for controlling a continuously variable transmission as defined in claim 1, wherein said desired engine speed setting means (70) selects the intake throttle position or intake pipe negative pressure and the vehicle speed as running parameters.
Claim 7
Dependent Claim
43 words
An apparatus for controlling a continuously variable transmission as defined in claim 1, wherein said acceleration detecting means (72) detects the requisition of vehicle acceleration from comparison of the change of intake throttle position with the passage of time with a predetermined value.
References Cited (Backward Citations)
US3684066A
Cited
US3942393A
Cited
SU603603A1
Cited
US4291594A
Cited
US4200007A
Cited
SU867710A1
Cited
US4338666A
Cited
US4471437A
Cited
US4515040A
Cited
US4543855A
Cited
JPS58180864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |