Patent US5125294A successfully refreshed from Google Patents.
US5125294A
Expired / Lapsed
US
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Method of controlling speed range shifting in an automatic transmission
Assignee: Honda Motor Co Ltd
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Filing: 1991-03-20
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Granted: 1992-06-30
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Expires: 2011-03-20
Abstract
Abstract In a method of controlling speed range shifting, an input-output speed ratio (=output speed/input speed) in a shifting means by which a power transmitting route for the pre-shift speed range is selected is detected when a shift signal to shift from a speed range in which engine brake is available to another speed range in which engine brake is also available is transmitted. An intermediate power transmitting route in which engine brake is not available is selected after the transmission of a shift signal as long as the range of the speed ratio is within a specified range. Then, a power transmitting route for the post-shift speed range is selected based on the shift signal when the change in the speed ratio becomes bigger than the specified range.
Inventors
- 👤 Aoki Takashi
- 👤 Sekine Noboru
- 👤 Ozawa Shigeo
- 👤 Shimada Takamichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/21; F16H61/04; F16H61/0437; F16H61/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
187 words
A method of controlling speed range shifting in an automatic transmission, said transmission having a plurality of power transmitting means by which a plurality of power transmitting routes are constituted and a plurality of shifting means by each of which a power transmitting route defined by one of said power transmitting means is respectively selected, said shifting means being selectively operated in accordance with a shift signal to effectuate shifting, said power transmitting routes includes at least one route in which engine brake is available and at least one route in which no engine brake is available, said method comprising the steps of; releasing a pre-shift power transmitting route when the shift signal is issued; selecting an intermediate power transmitting route in which no engine brake is available after the issuance of the shift signal and maintaining said intermediate power transmitting route for as long as an input-output speed ratio in the shifting means for said pre-shift power transmitting route is within a specified range, and then selecting a post-shift power transmitting route based on said shift signal when said input-output speed ratio exceeds said specified range.
Claim 2
Independent Claim
187 words
A method of controlling speed range shifting in an automatic transmission, said transmission having a plurality of power transmitting means by which a plurality of power transmitting routes are constituted and a plurality of shifting means by each of which a power transmitting route defined by one of said power transmitting means is respectively selected, said shifting means being selectively operated in accordance with a shift signal to effectuate shifting, said power transmitting routes includes at least one route in which engine brake is available and at least one route in which no engine brake is available, said method comprising the steps of; releasing a pre-shift power transmitting route when the shift signal is issued; selecting an intermediate power transmitting route in which no engine brake is available after the issuance of the shift signal and maintaining said intermediate power transmitting route for as long as an input-output speed ratio in the shifting means for said pre-shift power transmitting route is within a specified range, and then selecting a post-shift power transmitting route based on said shift signal when said input-output speed ratio exceeds said specified range.
Claim 3
Dependent Claim
19 words
A method of controlling speed range shifting as defined in claim 1, wherein said shifting means comprises clutch means.
Claim 4
Dependent Claim
96 words
A method of controlling speed range shifting as defined in claim 2, wherein, in case of a power-on shift-down, said intermediate power transmitting route is being selected as long as an input-output speed ratio e CLO in the pre-shift range clutch is greater than a specified speed ratio e SLD after the transmission of the power-on shift-down signal, and then the post-shift range clutch in accordance with the shift signal is operated to effectuate said shift when said speed ratio e CLO is equal to or decreases in value below the specified ratio e SLD .
Claim 5
Dependent Claim
66 words
A method of controlling speed range shifting as defined in claim 3, wherein said post-shift range clutch is brought into a condition immediately before engagement when said speed ratio e CLO has become equal to or less than said specified ratio e SLD , and then said post-shift range clutch is brought into engagement when said speed ratio e CLa has become substantially equal to 1.0.
Claim 6
Dependent Claim
94 words
A method of controlling speed range shifting as defined in claim 2, wherein, in case of a power-off shift-up, said intermediate power transmitting route is being selected as long as the input-output speed ratio e CLO in the pre-shift range clutch is smaller than a specified speed ratio e SLU after the transmission of the power-off shift-up signal, and then the post-shift range clutch in accordance with the shift signal is operated to effectuate said shift when said speed ratio e CLO becomes equal to or greater than the specified ratio e SLU .
Claim 7
Dependent Claim
66 words
A method of controlling speed range shifting as defined in claim 5, wherein said post-shift range clutch is brought into a condition immediately before engagement when said speed ratio e CLO has become equal to or greater than said specified ratio e SLU , and then said post-shift range clutch is brought into engagement when said speed ratio e CLa has become substantially equal to 1.0.
Claim 8
Independent Claim
199 words
A method of controlling speed range shifting in an automatic transmission, said transmission having a plurality of power transmitting means by which a plurality of power transmitting routes are constituted and a plurality of shifting means by each of which a power transmitting route defined by one of said power transmitting means is respectively selected, said shifting means being selectively operated in accordance with a shift signal to effectuate shifting, said power transmitting routes includes at least one route in which engine brake is available and at least one route in which no engine brake is available and which incorporates a one-way clutch, said method comprising the steps of; releasing a pre-shift power transmitting route when the shift signal is issued; selecting an intermediate power transmitting route in which no engine brake is available and which incorporates a one-way clutch after the issuance of the shift signal and maintaining said intermediate power transmitting route for as long as an input-output speed ratio in the shifting means for said pre-shift power transmitting route is within a specified range, and then selecting a post-shift power transmitting route based on said shift signal when said input-output speed ratio exceeds said specified range.
Claim 9
Independent Claim
199 words
A method of controlling speed range shifting in an automatic transmission, said transmission having a plurality of power transmitting means by which a plurality of power transmitting routes are constituted and a plurality of shifting means by each of which a power transmitting route defined by one of said power transmitting means is respectively selected, said shifting means being selectively operated in accordance with a shift signal to effectuate shifting, said power transmitting routes includes at least one route in which engine brake is available and at least one route in which no engine brake is available and which incorporates a one-way clutch, said method comprising the steps of; releasing a pre-shift power transmitting route when the shift signal is issued; selecting an intermediate power transmitting route in which no engine brake is available and which incorporates a one-way clutch after the issuance of the shift signal and maintaining said intermediate power transmitting route for as long as an input-output speed ratio in the shifting means for said pre-shift power transmitting route is within a specified range, and then selecting a post-shift power transmitting route based on said shift signal when said input-output speed ratio exceeds said specified range.
Claim 10
Dependent Claim
19 words
A method of controlling speed range shifting as defined in claim 7, wherein said shifting means comprises clutch means.
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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) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |