US4701853A
Expired / Lapsed
US
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Control device in continuously variable transmission system for vehicle
Assignee: Toyota Motor Corp
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Filing: 1985-05-31
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Granted: 1987-10-20
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Expires: 2005-05-31
Abstract
Abstract In a control device in a continuously variable transmission system for a vehicle, wherein the continuously variable transmission system is provided on a power transmission route of an engine and a speed ratio thereof is controlled such that an engine rotational speed can be a target engine rotational speed, when a detected acceleration during acceleration is smaller in value than the reference acceleration or a detected deceleration during deceleration is smaller in value than the reference deceleration, the transient time target engine rotational speed is selected instead of the steady time target engine rotational speed, whereby a speed ratio of the continuously variable transmission system is made to be a small value during acceleration and deceleration.
Inventors
- 👤 Akinori Osanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:21
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H61/66259; B; B60; B60W; B60W10/00; B60W10/04; B60W10/10; B60W10/101; B60W30/00; B60W30/18; B60W30/1819; B60W30/19; B60W2710/00; B60W2710/06; B60W2710/0644; B60W2710/0661; F16H59/00; F16H59/48
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
214 words
A control device in a continuously variable transmission system for a vehicle, wherein said continuously variable transmission system is provided on a power transmission route of an engine and a speed ratio thereof is controlled such that an engine rotational speed can be a target engine rotational speed, comprising: throttle opening sensor means; rotation angle sensor means; and processor means including: (a) an acceleration requirement detecting means for detecting a requirement for an acceleration of the vehicle; (b) a deceleration requirement detecting means for detecting a requirement for a deceleration of the vehicle; (c) an acceleration detecting means for detecting an acceleration of the vehicle; (d) a deceleration detecting means for detecting a deceleration of the vehicle; (e) a first comparing means for comparing a detected acceleration with a reference acceleration; (f) a second comparing means for comparing a detected deceleration with a reference deceleration; (g) a selecting means for selecting a steady time target engine rotational speed or a transient time target engine rotational speed as a target engine rotational speed; and (h) a control means for selecting a transient time target engine rotational speed when a detected acceleration during acceleration is smaller in value than the reference acceleration or a detected deceleration during deceleration is smaller in value than the reference deceleration.
Claim 2
Dependent Claim
214 words
A control device in a continuously variable transmission system for a vehicle, wherein said continuously variable transmission system is provided on a power transmission route of an engine and a speed ratio thereof is controlled such that an engine rotational speed can be a target engine rotational speed, comprising: throttle opening sensor means; rotation angle sensor means; and processor means including: (a) an acceleration requirement detecting means for detecting a requirement for an acceleration of the vehicle; (b) a deceleration requirement detecting means for detecting a requirement for a deceleration of the vehicle; (c) an acceleration detecting means for detecting an acceleration of the vehicle; (d) a deceleration detecting means for detecting a deceleration of the vehicle; (e) a first comparing means for comparing a detected acceleration with a reference acceleration; (f) a second comparing means for comparing a detected deceleration with a reference deceleration; (g) a selecting means for selecting a steady time target engine rotational speed or a transient time target engine rotational speed as a target engine rotational speed; and (h) a control means for selecting a transient time target engine rotational speed when a detected acceleration during acceleration is smaller in value than the reference acceleration or a detected deceleration during deceleration is smaller in value than the reference deceleration.
Claim 3
Dependent Claim
49 words
A control device as set forth in claim 1, wherein said acceleration requirement detecting means judges that an acceleration of the vehicle is required when a condition is satisfied that an intake throttle opening θ is larger than a predetermined value θ1, for longer than a predetermined time Ta1.
Claim 4
Dependent Claim
61 words
A control device as set forth in claim 2, wherein said control means satisfies the condition that when the transient time target engine rotational speed is selected, said selecting means is caused to select the transient time target engine rotational speed during a predetermined time Tb1 after θ is changed to a state of θ smaller than or equal to θ1.
Claim 5
Dependent Claim
54 words
A control device as set forth in claim 1, wherein said control means satisfies the condition that when the transient time target engine rotational speed is selected, said selecting means is caused to select the transient time target engine rotational speed during a predetermined time Tb1 after the detected acceleration exceeds the reference acceleration.
Claim 6
Dependent Claim
32 words
A control device as set forth in claim 1, wherein said deceleration requirement detecting means judges that a deceleration is required when an intake throttle opening ? is at an idling opening.
Claim 7
Dependent Claim
54 words
A control device as set forth in claim 1, wherein said control means satisfies the condition that when the transient time target engine rotational speed is selected, said selecting means is caused to select the transient time target engine rotational speed during a predetermined time Tb1 after the detected deceleration exceeds the reference deceleration.
Claim 8
Dependent Claim
31 words
A control device as set forth in claim 1, wherein said transient time target engine rotational speed is a function of an intake throttle opening θ and a vehicle speed V.
Claim 9
Dependent Claim
27 words
A control device as set forth in claim 1, wherein said reference acceleration is a function of an intake throttle opening θ and a vehicle speed V.
Claim 10
Dependent Claim
21 words
A control device as set forth in claim 1, wherein said reference deceleration is a function of a vehicle speed V.
Claim 11
Dependent Claim
46 words
A control device as set forth in claim 1, wherein said steady time target engine rotational speed, comprising an engine rotational speed at which a required value of an engine output commensurate to an intake throttle opening θ at the minimum fuel consumption rate is obtained.
Claim 12
Dependent Claim
37 words
A control device as set forth in claim 1, wherein said transient time target engine rotational speed, comprises an engine rotational speed at which the most proper driving torque and engine brake under various conditions are obtained.
Claim 13
Dependent Claim
50 words
A control device as set forth in claim 1, including a steady time table and a transient time table, which are commensurate to said steady time target engine rotational speed and said transient time target engine rotational speed, respectively, and wherein said selecting means selects either one of said tables.
Claim 14
Dependent Claim
34 words
A control device as set forth in claim 1, wherein said steady time target engine rotational speed comprises a basic target engine rotational speed multiplied by a coefficient thereof selected by said selecting means.
Claim 15
Dependent Claim
173 words
A control method of a continuously variable transmission system for a vehicle, wherein said continuously variable transmission system is provided on a power transmission route of an engine and a speed ratio thereof is controlled such that an engine rotational speed can be a target engine rotational speed, comprising the steps of: detecting an acceleration of the vehicle; judging whether or not the detected acceleration during acceleration is smaller in value than a reference acceleration; detecting a deceleration of the vehicle; judging whether or not the detected deceleration during deceleration is smaller in value than a reference deceleration; selecting a transient time target engine rotational speed when the detected acceleration during acceleration is smaller in value than the reference acceleration or the detected deceleration during deceleration is smaller in value than the reference deceleration; and selecting a steady time target engine rotational speed when the detected acceleration during acceleration is not smaller in value than the reference acceleration and the detected deceleration during deceleration is not smaller in value than the reference deceleration.
Claim 16
Dependent Claim
173 words
A control method of a continuously variable transmission system for a vehicle, wherein said continuously variable transmission system is provided on a power transmission route of an engine and a speed ratio thereof is controlled such that an engine rotational speed can be a target engine rotational speed, comprising the steps of: detecting an acceleration of the vehicle; judging whether or not the detected acceleration during acceleration is smaller in value than a reference acceleration; detecting a deceleration of the vehicle; judging whether or not the detected deceleration during deceleration is smaller in value than a reference deceleration; selecting a transient time target engine rotational speed when the detected acceleration during acceleration is smaller in value than the reference acceleration or the detected deceleration during deceleration is smaller in value than the reference deceleration; and selecting a steady time target engine rotational speed when the detected acceleration during acceleration is not smaller in value than the reference acceleration and the detected deceleration during deceleration is not smaller in value than the reference deceleration.
References Cited (Backward Citations)
US4507986A
Cited
US4543077A
Cited
US4590561A
Cited
US4546673A
Cited
US4584907A
Cited
US4569254A
Cited
US4561327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |