Patent EP0347263A2 successfully refreshed from Google Patents.
EP0347263A2
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EP
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Vehicle automatic transmission control system
Assignee: Honda Motor Co Ltd
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Filing: 1989-06-19
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Granted: —
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Expires: 2009-06-19
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 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 of the rules are successively calculated. Among the rules, one rule is finally selected and according to the gear indicated in the selected rule, the current gear is shifted up or down or is held at the present position, in case of the multi-step transmission. 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
EP
Data Source
google_patents
Last Synchronized
2026-10-27 17:09
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; F16H59/18; F16H2059/183; F16H2061/0075; F16H2061/0081; F16H61/16; F16H2061/161; F16H59/24; F16H59/60; F16H59/66; F16H59/74; F16H61/68; F16H61/684; F16H61/686; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
161 words
A system for controlling a vehicle automatic multi-step geared transmission, comprising; first means for detecting 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 calculated from the gradient of the road surface on which the vehicle is travelling, 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
161 words
A system for controlling a vehicle automatic multi-step geared transmission, comprising; first means for detecting 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 calculated from the gradient of the road surface on which the vehicle is travelling, 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
16 words
A system according to claim 1, wherein said reserve motive force is used for determining upshifting.
Claim 4
Dependent Claim
38 words
A system according to claim 1 or 2, 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 5
Dependent Claim
24 words
A system according to claim 3, wherein said rule selection is carried out by calculating a membership value of the detected or predicted values.
Claim 6
Dependent Claim
34 words
A system according to claim 3 or 4, 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 7
Dependent Claim
40 words
A system according to claim 4 or 5, 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 8
Independent Claim
24 words
A system according to any of claims 3 to 6, wherein said rules include a rule whose membership function complements that of another rule.
Claim 9
Independent Claim
22 words
A system according to any of claims 3 to 7, wherein the maximum value of said membership function differs among said rules.
Claim 10
Dependent Claim
23 words
A system according to claim 8, wherein said rule assigned the maximum membership value is a rule for protecting the engine from damage.
Claim 11
Independent Claim
165 words
A system for controlling a continuously variable transmission of a vehicle, comprising; first means for detecting 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 speed ratios to which it is possible to change from the current speed ratio, the change in the vehicle operating condition, including the change in the reserve motive force available calculated from the gradient of the road surface on which the vehicle is traveling, which would occur upon changing to such a ratio; 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 speed ratio to be changed to; and actuator means for driving a speed change mechanism in response to the determined result.
Claim 12
Independent Claim
165 words
A system for controlling a continuously variable transmission of a vehicle, comprising; first means for detecting 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 speed ratios to which it is possible to change from the current speed ratio, the change in the vehicle operating condition, including the change in the reserve motive force available calculated from the gradient of the road surface on which the vehicle is traveling, which would occur upon changing to such a ratio; 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 speed ratio to be changed to; and actuator means for driving a speed change mechanism in response to the determined result.
Claim 13
Dependent Claim
30 words
A system according to claim 10, wherein said fourth means carries out fuzzy reasoning on a coefficient and determines the speed ratio to be changed to by using the coefficient.
Claim 14
Dependent Claim
45 words
A system according to claim 10 or 11, wherein said second means further predicts, with respect to speed ratios to which it is possible to change from the current speed ratio, change in the engine speed which would occur upon changing to such a ratio.
Claim 15
Independent Claim
27 words
A system according to any of claims 10 to 12, wherein said reserve motive force is used for determining the ratio in changing in the higher direction.
Claim 16
Independent Claim
43 words
A system according to any of claims 10 to 13, wherein said fourth means determines the speed ratio to be changed to by selecting one of a plurality of speed change rules based on at least one among the detected and predicted values.
Claim 17
Dependent Claim
24 words
A system according to claim 14, wherein said rule selection is carried out by calculating a membership value of the detected or predicted values.
Claim 18
Dependent Claim
34 words
A system according to claim 13 or 14, 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 19
Independent Claim
24 words
A system according to any of claims 14 to 16, wherein said rules include a rule whose membership function complements that of another rule.
Claim 20
Independent Claim
34 words
A system as claimed in any of claims 1 to 9 wherein the reserve motive force available is calculated from the gradient of the road surface and the engine speed and/or the transmission ratio.
References Cited (Backward Citations)
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