US4660440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling continuously variable transmission
Assignee: Nissan Motor Co Ltd
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Filing: 1984-06-11
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Granted: 1987-04-28
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Expires: 2004-06-11
Abstract
Abstract Operation of a shift actuator system is monitored and a lock-up clutch in a torque converter or a fluid coupling is released when a shift operation monitoring signal has stayed unchanged for a predetermined time or the shift operation monitoring signal has stayed unchanged after a change in a shift command signal fed to the shift actuator system.
Inventors
- 👤 Toshio Matsumura
- 👤 Katsunori Oshiage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:37
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; F16H45/00; F16H45/02; F16H61/12; B60W50/00; B60W50/08; B60W50/14; B60W2050/143; F16H41/00; F16H41/24; F16H2041/246; F16H2061/1208; F16H2061/1256; F16H2061/1288; F16H61/14; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19153
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
A device for controlling a continuously variable transmission including a hydrodynamic transmission unit with a lock-up device shiftable between an engagement mode and a release mode, and a lock-up shift valve for shifting the lock-up device between the engagement mode and the release mode, comprising: means for generating a shift command signal; means for adjusting a reduction ratio in the continuously variable transmission in response to said shift command signal, said reduction ratio adjusting means including a shift actuator operatively coupled with said shift command generating means to be operative in response to said shift command signal; means for monitoring operation of the shift actuator and generating a shift operation monitoring signal indicative of the operation of said shift actuator; and means for detecting an abnormal operation of the shift actuator responsive to said shift operation monitoring signal and generating a lock-up release signal when said shift operation monitoring signal remains unchanged for a predetermined period after a predetermined condition has been satisfied, said lock-up release signal being fed to the lock-up shift valve so as to shift the lock-up device to the release mode.
Claim 2
Independent Claim
185 words
A device for controlling a continuously variable transmission including a hydrodynamic transmission unit with a lock-up device shiftable between an engagement mode and a release mode, and a lock-up shift valve for shifting the lock-up device between the engagement mode and the release mode, comprising: means for generating a shift command signal; means for adjusting a reduction ratio in the continuously variable transmission in response to said shift command signal, said reduction ratio adjusting means including a shift actuator operatively coupled with said shift command generating means to be operative in response to said shift command signal; means for monitoring operation of the shift actuator and generating a shift operation monitoring signal indicative of the operation of said shift actuator; and means for detecting an abnormal operation of the shift actuator responsive to said shift operation monitoring signal and generating a lock-up release signal when said shift operation monitoring signal remains unchanged for a predetermined period after a predetermined condition has been satisfied, said lock-up release signal being fed to the lock-up shift valve so as to shift the lock-up device to the release mode.
Claim 3
Dependent Claim
19 words
A device as claimed in claim 1, wherein said predetermined condition is satisfied upon expiration of a predetermined time.
Claim 4
Dependent Claim
26 words
A device as claimed in claim 1, wherein said predetermined condition is satisfied upon expiration of a predetermined time after said shift command signal has changed.
Claim 5
Dependent Claim
20 words
A device as claimed in claim 1, wherein said monitoring means includes a potentiometer operatively coupled to the shift actuator.
Claim 6
Dependent Claim
24 words
A device as claimed in claim 1, wherein said monitoring means includes means for detecting an actual reduction ratio in the continuously variable transmission.
Claim 7
Independent Claim
157 words
A method for controlling a continuously variable transmission including a hydrodynamic transmission unit with a lock-up device shiftable between an engagement mode and a release mode, a lock-up shift valve for shifting the lock-up device between the engagement mode and the release mode, comprising the steps of: generating a shift command signal; operating a shift actuator in response to said shift command signal and adjusting a reduction ratio in the continuously variable transmission; monitoring operation of the shift actuator and generating a shift operation monitoring signal indicative of the operation of said shift actuator; and detecting an abnormal operation of the shift actuator responsive to said shift operation monitoring signal and generating a lock-up release signal when said shift operation monitoring signal remains unchanged for a predetermined period after a predetermined condition has been satisfied, said lock-up release signal being fed to the lock-up shift valve so as to shift the lock-up device to the release mode.
Claim 8
Independent Claim
157 words
A method for controlling a continuously variable transmission including a hydrodynamic transmission unit with a lock-up device shiftable between an engagement mode and a release mode, a lock-up shift valve for shifting the lock-up device between the engagement mode and the release mode, comprising the steps of: generating a shift command signal; operating a shift actuator in response to said shift command signal and adjusting a reduction ratio in the continuously variable transmission; monitoring operation of the shift actuator and generating a shift operation monitoring signal indicative of the operation of said shift actuator; and detecting an abnormal operation of the shift actuator responsive to said shift operation monitoring signal and generating a lock-up release signal when said shift operation monitoring signal remains unchanged for a predetermined period after a predetermined condition has been satisfied, said lock-up release signal being fed to the lock-up shift valve so as to shift the lock-up device to the release mode.
Claim 9
Dependent Claim
33 words
A method as claimed in claim 6, wherein said abnormal operation detecting step comprises determining that said abnormal operation has occurred when said shift operation monitoring signal remains unchanged for a predetermined time.
Claim 10
Dependent Claim
36 words
A method as claimed in claim 6, wherein said abnormal operation detecting step determines that said abnormal operation progresses when said shift operation monitoring signal has stayed unchanged after a change in the shift command signal.
Claim 11
Independent Claim
175 words
A method for detecting abnormal operation of a shift actuator of a shift actuator system in controlling a continuously variable transmission including a hydrodynamic transmission unit with a lock-up device shiftable between an engagement mode and a release mode, and a lock-up shift valve for shifting the lock-up device between the engagement mode and the release mode, comprising the steps of: generating a shift command signal; operating said shift actuator in response to said shift command signal to adjust a reduction ratio in the continuously variable transmission; monitoring operation of said shift actuator and generating a shift operation monitoring signal indicative of the operation of said shift actuator; and determining, responsive to said shift command signal and said shift monitoring signal that an abnormal operation of said shift actuator has occurred when said shift operation monitoring signal remains unchanged for a predetermined time after occurrence of a change in said shift command signal, and generating a lock-up release signal; and shifting the lock-up device to the release mode in response to said lock-up release signal.
Claim 12
Independent Claim
175 words
A method for detecting abnormal operation of a shift actuator of a shift actuator system in controlling a continuously variable transmission including a hydrodynamic transmission unit with a lock-up device shiftable between an engagement mode and a release mode, and a lock-up shift valve for shifting the lock-up device between the engagement mode and the release mode, comprising the steps of: generating a shift command signal; operating said shift actuator in response to said shift command signal to adjust a reduction ratio in the continuously variable transmission; monitoring operation of said shift actuator and generating a shift operation monitoring signal indicative of the operation of said shift actuator; and determining, responsive to said shift command signal and said shift monitoring signal that an abnormal operation of said shift actuator has occurred when said shift operation monitoring signal remains unchanged for a predetermined time after occurrence of a change in said shift command signal, and generating a lock-up release signal; and shifting the lock-up device to the release mode in response to said lock-up release signal.
References Cited (Backward Citations)
US4174641A
Cited
US4349088A
Cited
US4393732A
Cited
US4431095A
Cited
US4449618A
Cited
US4457410A
Cited
US4499979A
Cited
JPS57161359A
Cited
JPS57161346A
Cited
JPS57161362A
Cited
US4510822A
Cited
US4509124A
Cited
US4522086A
Cited
US4495576A
Cited
US4579021A
Cited
US4526557A
Cited
US4475416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |