US5079704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle automatic transmission control system
Assignee: Honda Motor Co Ltd
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Filing: 1989-11-20
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Granted: 1992-01-07
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Expires: 2009-11-20
Abstract
Abstract A system for controlling automatic, multi-step or continuously variable, transmission equipped with a motor vehicle utilizing fuzzy logic. In the system, fuzzy production rules have been prepared based upon an expert driver's judgments and operation made on a vehicle with a manually shifted transmission. Various operating conditions including opening degree of a throttle valve and road speed of the vehicle are detected and from the detected value, various predictions are made such as an appropriateness of vehicle response determined from the reserve motive force with respect to a gear ratio shift intended by the driver and engine output change that would occur should the transmission be shifted to the gear ratio. These measured or estimated value are put on a common scale named universe of discourse and membership values of the rules are sucessively calculated. Among the rules, one rule is finally selected and according to the gear ratio indicated in the selected rule, the current gear ratio is shifted up or down or is held at the present ratio. Similarly, the speed ratio in the continuously variable transmission is determined from the selected rule.
Inventors
- 👤 Ichiro Sakai
- 👤 Yasuhisa Arai
- 👤 Hiroki Matsui
- 👤 Masataka Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:04
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; B; B60; B60W; B60W50/00; B60W2050/0001; B60W2050/0043; B60W2050/0057; F16H59/00; F16H59/14; F16H2059/142; F16H2061/0075; F16H2061/0081; F16H61/68; F16H61/682; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
230 words
A system for controlling a continuously variable transmission of a vehicle, comprising: control means for receiving outputs of a throttle position sensor, crankshaft angle sensor, and vehicle speed sensor as operating condition inputs to determine detected values for various operating conditions of the vehicle including engine speed, degree of throttle opening, vehicle speed, and current speed ratio, said control means further comprising a means for calculating and obtaining calculated values for change in throttle opening degree, acceleration, driving resistance and motive force to be generated at full throttle opening at speed ratios to which it is possible to shift to from the current speed ratio, to obtain a calculated value for change in the reserve motive force which would occur upon shifting to each of said speed ratios, means for establishing a membership function of a fuzzy set for each of a plurality of parameters from said detected values and calculated values in accordance with a plurality of predetermined fuzzy production rules defining a plurality of respective conclusions expressed in terms of speed ratio change, and means for carrying out fuzzy reasoning based on the fuzzy production rules to determine said respective conclusions and to determine a command value for speed ratio change based on the conclusions; and actuator means for actuating a speed ratio change mechanism in response to the determined command value to change said current speed ratio.
Claim 2
Independent Claim
230 words
A system for controlling a continuously variable transmission of a vehicle, comprising: control means for receiving outputs of a throttle position sensor, crankshaft angle sensor, and vehicle speed sensor as operating condition inputs to determine detected values for various operating conditions of the vehicle including engine speed, degree of throttle opening, vehicle speed, and current speed ratio, said control means further comprising a means for calculating and obtaining calculated values for change in throttle opening degree, acceleration, driving resistance and motive force to be generated at full throttle opening at speed ratios to which it is possible to shift to from the current speed ratio, to obtain a calculated value for change in the reserve motive force which would occur upon shifting to each of said speed ratios, means for establishing a membership function of a fuzzy set for each of a plurality of parameters from said detected values and calculated values in accordance with a plurality of predetermined fuzzy production rules defining a plurality of respective conclusions expressed in terms of speed ratio change, and means for carrying out fuzzy reasoning based on the fuzzy production rules to determine said respective conclusions and to determine a command value for speed ratio change based on the conclusions; and actuator means for actuating a speed ratio change mechanism in response to the determined command value to change said current speed ratio.
Claim 3
Dependent Claim
23 words
A system according to claim 1, wherein said speed ratio change is a coefficient which is to be multiplied to said speed ratio.
Claim 4
Dependent Claim
42 words
A system according to claim 1, wherein said driving resistance is calculated back from the law of motion such that the driving resistance is the difference between the force and the product of vehicle mass and the change in the vehicle speed.
Claim 5
Dependent Claim
28 words
A system according to claim 3, wherein said driving resistance is calculated based on a value expressed in terms of vehicle output torque exerted on a vehicle axle.
Claim 6
Dependent Claim
22 words
A system according to claim 4, wherein said vehicle output torque is calculated by averaging the torque generated for a predetermined period.
Claim 7
Dependent Claim
32 words
A system according to claim 4, wherein said vehicle output torque is adjusted by a slip factor existing between an input shaft rotation of the transmission and an output shaft rotation thereof.
Claim 8
Dependent Claim
18 words
A system according to claim 4, wherein said driving resistance calculation is interrupted when the vehicle is braking.
Claim 9
Dependent Claim
23 words
A system according to claim 7, wherein said driving resistance calculation is interrupted for a predetermined period after the vehicle braking has ceased
Claim 10
Dependent Claim
22 words
A system according to claim 8, wherein said driving resistance is set to be a predetermined value when the calculation is interrupted.
Claim 11
Independent Claim
25 words
A system according to claims 7 or 8, wherein said reserve motive force is set to be a predetermined value when the calculation is interrupted.
Claim 12
Dependent Claim
24 words
A system according to claim 4, wherein said driving resistance calculation is interrupted when said change in the throttle degree exceeds a reference value.
Claim 13
Dependent Claim
29 words
A system according to claim 11, wherein said driving resistance calculation is interrupted for a predetermined period after an excess in the change in throttle opening degree has ceased.
Claim 14
Dependent Claim
24 words
A system according to claim 11 or 12, wherein said driving resistance is set to be a predetermined value when the calculation is interrupted.
Claim 15
Dependent Claim
33 words
A system according to claim 13, wherein said predetermined value is the driving resistance calculated at a time prior to when said change in the throttle opening degree has exceeded said reference value.
Claim 16
Dependent Claim
20 words
A system according to claim 14, wherein said driving resistance is adjusted by a factor corresponding to the inertia resistance.
Claim 17
Dependent Claim
30 words
A system according to claim 15, wherein said driving resistance is adjusted by the factor which is determined with respect to a magnitude of the change in the vehicle speed.
Claim 18
Dependent Claim
16 words
A system according to claim 1, wherein said reserve motive force is used for determining upshifting.
Claim 19
Dependent Claim
64 words
A system according to claim 1, wherein said control means further obtains calculated values, with respect to speed ratios to which is possible to shift to from the current speed ratio, a ratio between change in engine output power estimated to be desired by a drive and that estimated to be actually generated, which would occur upon shifting to each of said speed ratios.
Claim 20
Dependent Claim
15 words
A system according to claim 17, wherein said calculated ratios are used for determining downshifting.
Claim 21
Dependent Claim
46 words
A system according to claim 1, wherein said control means further calculates, with respect to speed ratios to which it is possible to shift to from the current speed ratio, change in said engine speed which would occur upon shifting to each of said speed ratios.
Claim 22
Dependent Claim
17 words
A system according to claim 20, wherein said calculated values are used for determining upshifting and downshifting.
Claim 23
Dependent Claim
40 words
A system according to claim 1, wherein said control means determines the speed ratio to be shifted to by selecting one of a plurality of speed ratio shift rules based on at least one among the detected and calculated values.
Claim 24
Dependent Claim
24 words
A system according to claim 22, wherein said rule selection is carried out by calculating a membership value of the detected or calculated values.
Claim 25
Dependent Claim
32 words
A system according to claim 22, wherein said rules are established on the basis of an analysis of judgments and feelings of a driver of a vehicle with a manually shifted transmission.
Claim 26
Dependent Claim
38 words
A system according to claim 23, wherein said membership value is compared with a prescribed value and if the membership value is found to be not larger than the prescribed value, the selection of the rule is canceled.
Claim 27
Dependent Claim
19 words
A system according to claim 22, wherein said rules include a rule whose membership function complements that of another.
Claim 28
Independent Claim
199 words
A method for controlling a continuously variable transmission of a vehicle, comprising the steps of: determining detected values for vehicle operating conditions including degree of throttle opening, engine speed, vehicle speed, and current speed ratio; determining whether braking is in progress; calculating calculated values for vehicle acceleration, change in degree of throttle opening, driving resistance, motive force to be generated at speed ratios to which it is possible to shift to from the current speed ratio, and change in the reserve motive force which would occur upon shifting to each of said speed ratios; substituting a predetermined value for said driving resistance when braking is in progress; establishing a membership function of a fuzzy set for each of a plurality of parameters from said detected and calculated values in accordance with a plurality of predetermined fuzzy production rules defining a plurality of respective conclusions expressed in terms of speed ratio change; carrying out fuzzy reasoning based on the fuzzy production rules to determine said respective conclusions and to determine a command value for speed ratio change based on the conclusions; and changing said current speed ratio in response to the determined command value to change said current speed ratio.
Claim 29
Independent Claim
199 words
A method for controlling a continuously variable transmission of a vehicle, comprising the steps of: determining detected values for vehicle operating conditions including degree of throttle opening, engine speed, vehicle speed, and current speed ratio; determining whether braking is in progress; calculating calculated values for vehicle acceleration, change in degree of throttle opening, driving resistance, motive force to be generated at speed ratios to which it is possible to shift to from the current speed ratio, and change in the reserve motive force which would occur upon shifting to each of said speed ratios; substituting a predetermined value for said driving resistance when braking is in progress; establishing a membership function of a fuzzy set for each of a plurality of parameters from said detected and calculated values in accordance with a plurality of predetermined fuzzy production rules defining a plurality of respective conclusions expressed in terms of speed ratio change; carrying out fuzzy reasoning based on the fuzzy production rules to determine said respective conclusions and to determine a command value for speed ratio change based on the conclusions; and changing said current speed ratio in response to the determined command value to change said current speed ratio.
Claim 30
Independent Claim
233 words
A system for controlling a continuously variable transmission of a vehicle, comprising: control means for receiving outputs of a throttle position sensor, crankshaft angle sensor, brake switch and vehicle speed sensor as operating condition inputs, to determine when braking is in progress and detected values for various operating conditions of the vehicle including engine speed, degree of throttle opening, vehicle speed, and current speed ration, said control means further comprising means for calculating and obtaining calculated values for change in throttle opening degree, acceleration, driving resistance and motive force to be generated at speed ratios to which it is possible to shift to from the current speed ration, to obtain a calculated value for change in the reserve motive force which would occur upon shifting to each of said speed ratios, means for establishing a membership function of a fuzzy set for each of a plurality of parameters from said detected values and calculated values in accordance with a plurality of predetermined fuzzy production rules defining a plurality of respective conclusions expressed in terms of speed ratio change, and means for carrying out fuzzy reasoning based on the fuzzy production rules to determine said respective conclusions and to determine a command value for speed ratio change based on the conclusions; and actuator means for actuating a speed ratio change mechanism in response to the determined command value to change said current speed ratio.
Claim 31
Independent Claim
233 words
A system for controlling a continuously variable transmission of a vehicle, comprising: control means for receiving outputs of a throttle position sensor, crankshaft angle sensor, brake switch and vehicle speed sensor as operating condition inputs, to determine when braking is in progress and detected values for various operating conditions of the vehicle including engine speed, degree of throttle opening, vehicle speed, and current speed ration, said control means further comprising means for calculating and obtaining calculated values for change in throttle opening degree, acceleration, driving resistance and motive force to be generated at speed ratios to which it is possible to shift to from the current speed ration, to obtain a calculated value for change in the reserve motive force which would occur upon shifting to each of said speed ratios, means for establishing a membership function of a fuzzy set for each of a plurality of parameters from said detected values and calculated values in accordance with a plurality of predetermined fuzzy production rules defining a plurality of respective conclusions expressed in terms of speed ratio change, and means for carrying out fuzzy reasoning based on the fuzzy production rules to determine said respective conclusions and to determine a command value for speed ratio change based on the conclusions; and actuator means for actuating a speed ratio change mechanism in response to the determined command value to change said current speed ratio.
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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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |