Patent EP0377953A2 successfully refreshed from Google Patents.
EP0377953A2
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EP
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Vehicle automatic transmission control system
Assignee: Honda Motor Co Ltd
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Filing: 1989-11-20
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Granted: —
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Expires: 2009-11-20
Abstract
Abstract A system for controlling automatic 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 successively 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.
Inventors
- 👤 Ichiro C/O Kabushiki Kaisha Honda Sakai
- 👤 Yasuhisa C/O Kabushiki Kaisha Honda Arai
- 👤 Hiroki C/O Kabushiki Kaisha Honda Matsui
- 👤 Masataka C/O Kabushiki Kaisha Honda Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:59
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: 29
Claim 1
Independent Claim
159 words
A system for controlling a continuously variable vehicle automatic transmission, comprising; first means for determining operating condition of the vehicle including engine speed, degree of throttle opening, change in the throttle opening degree, vehicle speed and change in the vehicle speed; second means for calculating the driving resistance and for evaluating the motive force to be generated at gear ratios to which it is possible to shift from the current gear ratio, to predict change in the reserve motive force, which would occur upon shifting to each of such gear ratios; third means for establishing a membership function of a fuzzy set on the detected values and the predicted values; fourth means for carrying out fuzzy reasoning on the basis of the determined values and the predicted values using the membership function assigned thereto to determine a gear ratio to be shifted; and actuator means for driving a gear ratio shift mechanism in response to the determined gear ratio.
Claim 2
Independent Claim
159 words
A system for controlling a continuously variable vehicle automatic transmission, comprising; first means for determining operating condition of the vehicle including engine speed, degree of throttle opening, change in the throttle opening degree, vehicle speed and change in the vehicle speed; second means for calculating the driving resistance and for evaluating the motive force to be generated at gear ratios to which it is possible to shift from the current gear ratio, to predict change in the reserve motive force, which would occur upon shifting to each of such gear ratios; third means for establishing a membership function of a fuzzy set on the detected values and the predicted values; fourth means for carrying out fuzzy reasoning on the basis of the determined values and the predicted values using the membership function assigned thereto to determine a gear ratio to be shifted; and actuator means for driving a gear ratio shift mechanism in response to the determined gear ratio.
Claim 3
Dependent Claim
25 words
A system according to claim 1, wherein said motive force evaluated is the motive force to be generated at full throttle opening at such ratios.
Claim 4
Dependent Claim
44 words
A system according to claim 1 or 2, 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
31 words
A system according to claim 3, wherein said driving resistance is calculated on the basis of a value expressed in the term 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
34 words
A system according to claim 4 or 5, wherein said vehicle output torque is adjusted by a slip factor occurred between the input shaft rotation of the transmission and the output shaft rotation thereof.
Claim 8
Independent Claim
22 words
A system according to any of claims 3 to 6 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
24 words
A system according to claim 7 or 8, wherein said driving resistance is set to be a predetermined value when the calculation is interrupted.
Claim 11
Independent Claim
26 words
A system according to claims 7, 8 or 9, wherein said reserve motive force is set to be a predetermined value when the calculation is interrupted.
Claim 12
Dependent Claim
28 words
A system according to any of claim 3 to 10 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 the 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 earlier than the time when the 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
32 words
A system according to claim 14 or 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
Independent Claim
17 words
A system according to any preceding claim, wherein said reserve motive force is used for determining upshifting.
Claim 19
Independent Claim
62 words
A system according to any preceding claim, wherein said second means further predicts, with respect to gear ratios to which it is possible to shift from the current gear ratio, a ratio between change in engine output power estimated to be desired by the driver and that estimated to be actually generated, which would occur upon shifting each of such gear ratios.
Claim 20
Dependent Claim
15 words
A system according to claim 18, wherein said predicted ratios are used for determining downshifting.
Claim 21
Independent Claim
46 words
A system according to any preceding claim, wherein said second means further predicts, with respect to gear ratios to which it is possible to shift from the current gear ratio, change in said engine speed which would occur upon shifting to each of such gear ratios.
Claim 22
Dependent Claim
17 words
A system according to claim 20, wherein said predicted values are used for determining upshifting and downshifting.
Claim 23
Independent Claim
40 words
A system according to any preceding claim, wherein said fourth means determines the gear ratio to be shifted by selecting one of a plurality of gear ratio shift rules based on at least one among the detected and predicted 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 predicted values.
Claim 25
Independent Claim
34 words
A system according to claims 22 or 23, 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
Independent Claim
23 words
A system according to any of claims 22 to 25 wherein said rules include a rule whose membership function complements that of another.
Claim 28
Independent Claim
145 words
A system for controlling a vehicle automatic transmission, comprising; first means for determining operating conditions of the vehicle including engine speed, degree of throttle opening, change in the throttle opening degree, vehicle speed and change in the vehicle speed; second means for predicting, with respect to gears to which it is possible to shift from the gear currently engaged, the change in the vehicle operating condition, including the change in the reserve motive force available, which would occur upon shifting to each of such gears; third means for establishing a membership function on the detected values and the predicted value; fourth means for carrying out fuzzy reasoning on the basis of the detected values and the predicted value using the membership function assigned thereto, to determine a gear to be engaged; and actuator means for driving a gearshift mechanism in response to the determined result.
Claim 29
Independent Claim
145 words
A system for controlling a vehicle automatic transmission, comprising; first means for determining operating conditions of the vehicle including engine speed, degree of throttle opening, change in the throttle opening degree, vehicle speed and change in the vehicle speed; second means for predicting, with respect to gears to which it is possible to shift from the gear currently engaged, the change in the vehicle operating condition, including the change in the reserve motive force available, which would occur upon shifting to each of such gears; third means for establishing a membership function on the detected values and the predicted value; fourth means for carrying out fuzzy reasoning on the basis of the detected values and the predicted value using the membership function assigned thereto, to determine a gear to be engaged; and actuator means for driving a gearshift mechanism in response to the determined result.
References Cited (Backward Citations)
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