Control system for changing automatic gears
First Claim
1. A control system (10) for determining gear changing points for use in changing gears in an automatic transmission (3), said system including detection means (9) for detecting input variables derived from a driver-vehicle system, processing means (11-15) containing fuzzy-production rules for processing said input variables and producing output variables, and gear change means (3) for determining gear changing points for changing gear ratios according to said output variables, wherein the improvement comprises:
- said processing means contains the following sets of fuzzy-production rules;
a) a set of basic rules for determining gear-changing points that define a consumption-oriented driving style, in accordance with current input variables detected by said detection means;
b) a set of identification rules for identifying a current driving style of a current driver, ranging from a consumption-oriented to a performance-oriented driving style, in accordance with current input variables detected by said detection means (9); and
c) a set of adaption rules for producing a set of modified rules, derived from the basic set of rules, for determining gear-changing points that define a driving style ranging from a consumption-oriented driving style to a performance-oriented driving style, in accordance with the identified current driving style.
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Abstract
The invention concerns a control system (10) for changing automatic gears (3) that operates according to fuzzy logic methods. All the fuzzy-production rules are divided into at least three sections: a set of basic rules to determine the gear-changing point in a consumption-oriented driving style, a set of adaptation rules to modify the set of basic rules depending on a current driving style and an identification set of rules for classifying the driver according to his/her driving style. By way of a supplementary set of adaptation rules the set of basic rules can be additionally modified according to a current driving condition. Individual function blocks (11 to 15) operate preferably according to the same inference mechanism. Gamma operators are used in order to approximate as closely as possible human behavior. A process is proposed for generating membership functions to determine a running condition by fuzzy-production rules. In a preferred embodiment the adaptive gear-changing behavior is activated by forming offsets. Priorities are allotted to the rules especially for reasons of safety and reliability.
27 Citations
20 Claims
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1. A control system (10) for determining gear changing points for use in changing gears in an automatic transmission (3), said system including detection means (9) for detecting input variables derived from a driver-vehicle system, processing means (11-15) containing fuzzy-production rules for processing said input variables and producing output variables, and gear change means (3) for determining gear changing points for changing gear ratios according to said output variables, wherein the improvement comprises:
said processing means contains the following sets of fuzzy-production rules; a) a set of basic rules for determining gear-changing points that define a consumption-oriented driving style, in accordance with current input variables detected by said detection means; b) a set of identification rules for identifying a current driving style of a current driver, ranging from a consumption-oriented to a performance-oriented driving style, in accordance with current input variables detected by said detection means (9); and c) a set of adaption rules for producing a set of modified rules, derived from the basic set of rules, for determining gear-changing points that define a driving style ranging from a consumption-oriented driving style to a performance-oriented driving style, in accordance with the identified current driving style. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A fuzzy-logic controller for determining gear ratios for use in changing gears in an automatic transmission, said controller having input means of receiving input variables derived from a driver-vehicle system, means to form inferences from said input variables according to fuzzy-production rules, and means for defuzzying said inferences into output variables for determining a gear ratio to be automatically changed, said controller comprising:
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a) a rule processor for determining gear-changing points from said input variables according to a set of fuzzy-production basic rules; b) a rule processor for identifying a driving style, of a current driver of said driver-vehicle system, from said input variables according to a set of fuzzy-production identification rules; and c) a rule processor for identifying a current driving condition from said input variables according to a set of fuzzy-production supplementary identification rules; and b) a rule processor for adapting the determined gear-changing points with a set of fuzzy-production adaptation rules according to said identified driving style and said identified driving condition.
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Specification