Patent US5035157A successfully refreshed from Google Patents.
US5035157A
Expired / Lapsed
US
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Method of shift control in an automatic transmission
Assignee: Honda Motor Co Ltd
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Filing: 1989-02-10
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Granted: 1991-07-30
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Expires: 2009-02-10
Abstract
Abstract A method of shift control in an automatic transmission, wherein a shift map has a shift-up line and a shift-down line between each gear change which is used to conduct the shift control with a hysteresis zone being established between each shift-up line and shift-down line. The method includes the steps of shifting down a speed range when a point representing a traveling state on the shift map moves in the lower vehicle speed direction and crosses the shift-down line, shifting up a speed range when the point moves in the higher vehicle speed direction and crosses the shift-up line, and shifting down the speed range when the point is in the hysteresis zone after a shift and also the increasing rate of the engine power is greater than a specified value.
Inventors
- 👤 Takashi Aoki
- 👤 Satoshi Terayama
- 👤 Junichi Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:52
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; F16H61/10; F16H2061/0075; F16H2061/0096; F16H61/68; F16H61/682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine throttle openings, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of: shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line; shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate which is greater than a specified value.
Claim 2
Independent Claim
177 words
A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine throttle openings, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of: shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line; shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate which is greater than a specified value.
Claim 3
Dependent Claim
64 words
A method of shift control in an automatic transmission as defined in claim 1; wherein said engine power is detected based on a depression of a throttle pedal and the speed range is shifted down when said point is in said hysteresis zone after a shift-up of said speed range and also an increasing rate of said depression is greater than a specified value.
Claim 4
Dependent Claim
64 words
A method of shift control in an automatic transmission as defined in claim 1; wherein said engine power is detected based on an opening of a throttle valve and the speed range is shifted down when said point is in said hysteresis zone after a shift-up of said speed range and also an increasing rate of said opening is greater than a specified value.
Claim 5
Dependent Claim
69 words
A method of shift control in an automatic transmission as defined in claim 1; wherein first, second, third and fourth speed ranges can be set in said shift-gear mechanism and the shift-up lines and the shift-down lines are established between the first speed range and the second speed range, the second speed range and the third speed range, and the third speed range and the fourth speed range respectively.
Claim 6
Independent Claim
176 words
A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine intake throttle opening, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of: shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line; shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate greater than a specified value.
Claim 7
Independent Claim
176 words
A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine intake throttle opening, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of: shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line; shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate greater than a specified value.
References Cited (Backward Citations)
US4122732A
Cited
US4226295A
Cited
US4551802A
Cited
US4599917A
Cited
US4692866A
Cited
US4712452A
Cited
JPS61189354A
Cited
US4718309A
Cited
US4698763A
Cited
US4706522A
Cited
US4823646A
Cited
US4849899A
Cited
US4841815A
Cited
US4977797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |