EP0347261A2
Expired / Lapsed
EP
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Vehicle automatic transmission control system
Assignee: Honda Motor Co Ltd
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Filing: 1989-06-19
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Granted: —
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Expires: 2009-06-19
Abstract
Abstract A system for controlling automatic transmissions equipped 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 to a gearshift intended by the driver and engine output change that would occur should the transmission be shifted to a given gear. These measured or estimated value are put on a common scale named universe of discourse and membership values degree of the aforesaid rules are successively calculated. Among the rules, one rule is finally selected and according to a gear position indicated in the selected rule, the current gear is shifted up or down or is held at the present position.
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
2026-10-27 09:23
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; F16H59/74; F16H2059/743; F16H2061/0075; F16H2061/0081; F16H61/16; F16H2061/161; F16H61/68; F16H61/682; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
145 words
A system for controlling a 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 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 2
Independent Claim
145 words
A system for controlling a 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 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 3
Dependent Claim
44 words
A system according to claim 1, wherein said second means further predicts, with respect to gears to which it is possible to shift from the gear currently engaged, the change in the engine speed which would occur upon shifting to each of such gears.
Claim 4
Dependent Claim
76 words
A system according to claim 1 or 2, wherein said second means further predicts, with respect to gears to which it is possible to shift from the gear currently engaged, a first ratio between change in engine output power estimated to be desired by the driver on the basis of the detected throttle opening and the change therein and the actual change in engine output power which would occur upon shifting to each of such gears.
Claim 5
Dependent Claim
51 words
A system according to claim 1, 2 or 3, wherein said first means determines a second ratio between change in engine output power estimated to be desired by the driver on the basis of the detected throttle opening and the change therein and the actual change in the engine output power.
Claim 6
Dependent Claim
30 words
A system according to claim 4, wherein said second ratio is used for determining downshifting and said first ratio is used for determining the gear to be shifted down to.
Claim 7
Independent Claim
17 words
A system according to any preceding claim wherein said reserve motive force is used for determining upshifting.
Claim 8
Dependent Claim
52 words
A system according to claim 6, wherein said first means detects the ratio between engine output power estimated to be desired by the driver on the basis of the detected throttle opening and actual engine output power, and the ratio is used for determining upshifting together with the predicted reserve motive force.
Claim 9
Dependent Claim
27 words
A system according to claim 7, wherein said reserve motive force is predicted on the basis of the ratio of the motive force to the driving resistance.
Claim 10
Dependent Claim
22 words
A system according to claim 8, wherein said driving resistance is calculated on the basis of the change in the vehicle speed.
Claim 11
Dependent Claim
22 words
A system according to claim 9, wherein said driving resistance is adjusted in proportion to a slip factor of said gearshift mechanism.
Claim 12
Independent Claim
37 words
A system according to any preceding claim, wherein said fourth means determines the gear to be engaged by selecting one of a plurality of gearshift rules based on at least one among the detected and predicted values.
Claim 13
Dependent Claim
24 words
A system according to claim 11, wherein said rule selection is carried out by calculating a membership value of the detected or predicted values.
Claim 14
Dependent Claim
34 words
A system according to claim 11 or 12, 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 15
Dependent Claim
40 words
A system according to claim 12 or 13, 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 16
Independent Claim
23 words
A system according to any of claims 11 to 14, wherein said rules include a rule whose membership function complements that of another.
Claim 17
Independent Claim
22 words
A system according to any of claims 11 to 15, wherein the maximum value of said membership function differs among said rules.
Claim 18
Dependent Claim
23 words
A system according to claim 16, wherein said rule assigned the maximum membership value is a rule for protecting the engine from damage.
References Cited (Backward Citations)
No citation records indexed.
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