US4688450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for shift control in an automatic transmission for a vehicle
Assignee: Toyota Motor Corp
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Filing: 1986-07-25
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Granted: 1987-08-25
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Expires: 2006-07-25
Abstract
Abstract A method and system for shift control in an automatic transmission for a vehicle, wherein, during shifting, engine torque is changed to thereby maintain the shift characteristics satisfactorily, and wherein at least engine torque control in association with 1st shifting is stopped when a 2nd shifting command is emitted before 1st shifting is completed. When only the engine torque control in association with 1st shifting is stopped, thereafter, only the engine torque control in association with 2nd shifting can be performed, so that unnecessary torque control can be dispensed with. Furthermore, when engine torque controls in association with not only the 1st shifting but also the 2nd shifting are stopped, an unnecessary change in the engine torque control can be dispensed with in the case of shifting in which the shifting operation is not substantially performed.
Inventors
- 👤 Kazuhiko Hayashi
- 👤 Kunihiro Iwatsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:47
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/11; B60W10/115; B60W30/00; B60W30/18; B60W30/1819; F; F16; F16H; F16H61/00; F16H61/16; F16H2306/00; F16H2306/24; F16H63/00; F16H63/40; F16H63/50; F16H63/502
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A method of shift control in an automatic transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, which comprises: detecting emission of a 1st shifting command; detecting emission of a 2nd shifting command; and stopping engine torque control in association with said 1st shifting when said 2nd shifting command is emitted before said 1st shifting is completed.
Claim 2
Independent Claim
70 words
A method of shift control in an automatic transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, which comprises: detecting emission of a 1st shifting command; detecting emission of a 2nd shifting command; and stopping engine torque control in association with said 1st shifting when said 2nd shifting command is emitted before said 1st shifting is completed.
Claim 3
Dependent Claim
30 words
A method of shift control in an automatic transmission for a vehicle as set forth in claim 1, wherein said engine torque control comprises control of torque reduction and restoration.
Claim 4
Dependent Claim
34 words
A method of shift control in an automatic transmission for a vehicle as set forth in claim 1, wherein said 1st shifting comprises a down shift and said 2nd shifting comprises an up shift.
Claim 5
Dependent Claim
63 words
A method of shift control in an automatic transmission for a vehicle as set forth in claim 1, which further comprises immediately stopping engine torque control in association with said 1st shifting when said 2nd shifting comes before said 1st shifting is completed and performing engine torque control of said 2nd shifting as soon as a condition for said 2nd shifting is established.
Claim 6
Independent Claim
101 words
A system for shift control in an transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, comprising: means for detecting an emission of a 1st shifting command; means for detecting an emission of a 2nd shifting command; and means for stopping engine torque control in association with said 1st shifting when said 2nd shifting command is emitted before said 1st shifting is completed wherein said means for stopping engine torque control is in communication with said means for detecting an emission of said 1st and 2nd shifting command.
Claim 7
Independent Claim
101 words
A system for shift control in an transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, comprising: means for detecting an emission of a 1st shifting command; means for detecting an emission of a 2nd shifting command; and means for stopping engine torque control in association with said 1st shifting when said 2nd shifting command is emitted before said 1st shifting is completed wherein said means for stopping engine torque control is in communication with said means for detecting an emission of said 1st and 2nd shifting command.
Claim 8
Independent Claim
70 words
A method of shift control in an automatic transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, which comprises: detecting emission of a 1st shifting command; detecting emission of a 2nd shifting command; stopping engine torque control of both said 1st and 2nd shiftings when said 2nd shifting command is emitted before said 1st shifting is completed.
Claim 9
Independent Claim
70 words
A method of shift control in an automatic transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, which comprises: detecting emission of a 1st shifting command; detecting emission of a 2nd shifting command; stopping engine torque control of both said 1st and 2nd shiftings when said 2nd shifting command is emitted before said 1st shifting is completed.
Claim 10
Dependent Claim
30 words
A method of shift control in an automatic transmission for a vehicle as set forth in claim 6, wherein said engine torque control comprises control of torque reduction and restoration.
Claim 11
Dependent Claim
34 words
A method of shift control in an automatic transmission for a vehicle as set forth in claim 6, wherein said 1st shifting comprises an up shift and said 2nd shifting comprises a down shift.
Claim 12
Independent Claim
102 words
A system for shift control in an transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, comprising: means for detecting an emission of a 1st shifting command; means for detecting an emission of a 2nd shifting command; and means for stopping engine torque controls of both said 1st and 2nd shiftings when said 2nd shifting command is emitted before said 1st shifting is completed wherein said means for stopping engine torque controls is in communication with said means for detecting an emission of said 1st and 2nd shifting command.
Claim 13
Independent Claim
102 words
A system for shift control in an transmission for a vehicle, wherein, during shifting, engine torque is changed by a predetermined value to thereby maintain the shift characteristics satisfactorily, comprising: means for detecting an emission of a 1st shifting command; means for detecting an emission of a 2nd shifting command; and means for stopping engine torque controls of both said 1st and 2nd shiftings when said 2nd shifting command is emitted before said 1st shifting is completed wherein said means for stopping engine torque controls is in communication with said means for detecting an emission of said 1st and 2nd shifting command.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |