US4704683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for performing control during acceleration continuously variable transmission system for vehicle
Assignee: Toyota Motor Corp
•
Filing: 1985-05-30
•
Granted: 1987-11-03
•
Expires: 2005-05-30
Abstract
Abstract In a device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of the continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', a predetermined value Nb lower than Ne' and a predetermined vale N×3 slightly higher than Nb are set, the shift in the continuously variable transmission system is interrupted until Ne is increased to a predetermined value higher than Ne' when Ne enters a state of Nb<Ne≦N×3, and the speed ratio e of the continuously variable transmission system is continuously raised until Ne is decreased to a state of Ne≦N×3 when Ne is changed from a state of Ne>Ne' to a state of Ne<Ne', so that the device can maintain a satisfactory acceleration, suppress the decline of a transmission efficiency and reduce the noise level during acceleration.
Inventors
- 👤 Akinori Osanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/101; B60W10/107; B60W30/00; B60W30/18; B60W30/1819; B60W30/188; F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H61/66259; F16H2061/6604; F16H2061/6611; F16H2061/6615
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
167 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of said continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', comprising: processor means for performing the functions of, setting a predetermined value Nb lower than said Ne' and a predetermined value N×3 slightly higher than Nb, generating a signal for controlling interrupting, when Ne enters a state of Nb<Ne≦N×3, changes in the speed ratio of said continuously variable transmission system until Ne is increased to a predetermined value equal to or higher than Ne', and generating for controlling continuously raising the speed ratio e of said continuously variable transmission system until Ne is decreased to a state of Ne≦N×3 when Ne is changed from a state of Ne≧Ne' to a state Ne<Ne'; and means for varying said speed ratio e under the control of the signals generated by said processor means.
Claim 2
Independent Claim
167 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of said continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', comprising: processor means for performing the functions of, setting a predetermined value Nb lower than said Ne' and a predetermined value N×3 slightly higher than Nb, generating a signal for controlling interrupting, when Ne enters a state of Nb<Ne≦N×3, changes in the speed ratio of said continuously variable transmission system until Ne is increased to a predetermined value equal to or higher than Ne', and generating for controlling continuously raising the speed ratio e of said continuously variable transmission system until Ne is decreased to a state of Ne≦N×3 when Ne is changed from a state of Ne≧Ne' to a state Ne<Ne'; and means for varying said speed ratio e under the control of the signals generated by said processor means.
Claim 3
Dependent Claim
44 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 1, wherein said target engine rotational speed Ne' is set as a function of an intake throttle opening and a vehicle speed.
Claim 4
Dependent Claim
45 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 1, wherein said Nb is set at a value in a predetermined ratio to Ne' in a region of a low throttle opening.
Claim 5
Dependent Claim
43 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 3, wherein said Nb is set at a value of 90% of Ne' in a region of a low throttle opening.
Claim 6
Dependent Claim
40 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 1, wherein said Nb is set as the maximum torque engine rotational speed during the maximum throttle opening.
Claim 7
Dependent Claim
36 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 1, wherein said N×3 is set at a value 50-200 rpm higher than Nb.
Claim 8
Dependent Claim
74 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 1, wherein, in the case where said Ne is changed from state of Ne>Ne' to a state of Ne<Ne', the variation value of said speed ratio e of said continuously variable transmission system before Ne is decreased to a state of Ne≦N×3 is set separately of the case other than the above.
Claim 9
Independent Claim
188 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of said continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', comprising: processor means for performing the functions of, setting a predetermined value Nb lower than said Ne' and a predetermined value N×3 slightly higher than Nb, detecting whether a difference between Ne' and Nb is large or not, generating a signal for controlling interrupting, when Ne enters a state of Nb<Ne≦N×3, changes in the speed ratio of said continuously variable transmission system until Ne is increased to a predetermined value equal to or higher than Ne', and generating signals for controlling continuously raising the speed ratio e of said continuously variable transmission system until Ne is decreased to a state of Ne≦N×3 when the difference between Ne' and Nb is large and Ne is changed from a state Ne≦Ne' to a state of Ne<Ne'; and means for varying said speed ratio e under control of the signals generated by said processor means.
Claim 10
Independent Claim
188 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of said continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', comprising: processor means for performing the functions of, setting a predetermined value Nb lower than said Ne' and a predetermined value N×3 slightly higher than Nb, detecting whether a difference between Ne' and Nb is large or not, generating a signal for controlling interrupting, when Ne enters a state of Nb<Ne≦N×3, changes in the speed ratio of said continuously variable transmission system until Ne is increased to a predetermined value equal to or higher than Ne', and generating signals for controlling continuously raising the speed ratio e of said continuously variable transmission system until Ne is decreased to a state of Ne≦N×3 when the difference between Ne' and Nb is large and Ne is changed from a state Ne≦Ne' to a state of Ne<Ne'; and means for varying said speed ratio e under control of the signals generated by said processor means.
Claim 11
Dependent Claim
51 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 8, wherein a threshold value N×2 for determining whether the difference between Ne' and Nb is large or not is set at a value 50-200 rpm lower than Ne'.
Claim 12
Independent Claim
138 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of said continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', comprising: processor means for performing the functions of, setting a predetermined value N×1 higher than said Ne', generating signals for controlling the variation value Δe of said speed ratio e to be at a small value when said Ne is in a state of Ne'<Ne<N×1, and generating signals for controlling the variation value Δe of said speed ratio e to be at a large value when said Ne is in a state of Ne>N×1; and means for varying said speed ratio e under control of the signals generated by said processor means.
Claim 13
Independent Claim
138 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle, wherein a speed ratio e of said continuously variable transmission system is controlled such that an actual engine rotational speed Ne can be a target engine rotational speed Ne', comprising: processor means for performing the functions of, setting a predetermined value N×1 higher than said Ne', generating signals for controlling the variation value Δe of said speed ratio e to be at a small value when said Ne is in a state of Ne'<Ne<N×1, and generating signals for controlling the variation value Δe of said speed ratio e to be at a large value when said Ne is in a state of Ne>N×1; and means for varying said speed ratio e under control of the signals generated by said processor means.
Claim 14
Dependent Claim
35 words
A device for performing the control during acceleration in a continuously variable transmission system for a vehicle as set forth in claim 10, wherein N×1 is set at a value 100 rpm higher than Ne'.
References Cited (Backward Citations)
US4507986A
Cited
US4546673A
Cited
JPS59144849A
Cited
JPS59144850A
Cited
US4594916A
Cited
US4584907A
Cited
US4569254A
Cited
US4561327A
Cited
US4601680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |