Shift control system for automatic transmission based on fuzzy control
First Claim
1. A system for controlling a speed change ratio shifting operation of an automatic transmission for an automotive vehicle, comprising:
- required driving force inferring means inferring a driving force required by a driver of said automotive vehicle;
post-shift driving force inferring means inferring a driving force after a speed change ratio shifting operation of said automatic transmission to a resulting speed change ratio corresponding to each of given plural speed change ratios which are obtainable by said speed change ratio shifting operation of said automatic transmission;
first parameter calculating means designating a deviation between said required driving force and said driving force after said speed change ratio shifting operation of said automatic transmission as a first parameter and calculating a degree of said driving force deviation as a first parameter value, for each of said given speed change ratios;
second parameter calculating means designating a given condition of said automotive vehicle as a second parameter and calculating a value of said condition as a second parameter value, for each of said given speed change ratios;
speed change ratio selecting means determining membership values of said first and said second parameters based on membership functions of said first and second parameters for each of said given speed change ratios, selecting an optimum speed change ratio among said given speed change ratios by referring to said membership values of said first and said second parameters for said given speed change ratios based on fuzzy inference, and producing an output signal corresponding to said optimum speed change ratio; and
means, responsive to said output signal, for controlling said speed change ratio shifting operation of said automatic transmission to achieve said optimum speed change ratio.
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Abstract
Sensors (20, 21) provide a degree of throttle valve opening (TVO) and an output shaft revolution speed (No) to CPU (10), respectively. CPU (10) carries out a fuzzy inference for each gear position based on two kinds of parameters referring to a driving force deviation (Ef(i)) and a fuel consumption ratio (Qf(i)), and selects a speed change ratio which makes the appraisals for the driving force deviation and the fuel consumption ratio best, as a mark speed change ratio for the next gear position (NextGp), according to a predetermined program. Thus the shift control system selects a gear position corresponding to the speed change ratio by which the deviation between the driver'"'"'s requiring driving force and the driving force after shifting becomes few, while the fuel consumption ratio becomes good.
28 Citations
22 Claims
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1. A system for controlling a speed change ratio shifting operation of an automatic transmission for an automotive vehicle, comprising:
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required driving force inferring means inferring a driving force required by a driver of said automotive vehicle; post-shift driving force inferring means inferring a driving force after a speed change ratio shifting operation of said automatic transmission to a resulting speed change ratio corresponding to each of given plural speed change ratios which are obtainable by said speed change ratio shifting operation of said automatic transmission; first parameter calculating means designating a deviation between said required driving force and said driving force after said speed change ratio shifting operation of said automatic transmission as a first parameter and calculating a degree of said driving force deviation as a first parameter value, for each of said given speed change ratios; second parameter calculating means designating a given condition of said automotive vehicle as a second parameter and calculating a value of said condition as a second parameter value, for each of said given speed change ratios; speed change ratio selecting means determining membership values of said first and said second parameters based on membership functions of said first and second parameters for each of said given speed change ratios, selecting an optimum speed change ratio among said given speed change ratios by referring to said membership values of said first and said second parameters for said given speed change ratios based on fuzzy inference, and producing an output signal corresponding to said optimum speed change ratio; and means, responsive to said output signal, for controlling said speed change ratio shifting operation of said automatic transmission to achieve said optimum speed change ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for controlling a speed change ratio shifting operation of an automatic transmission for an automotive vehicle, comprising:
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means for inferring a driving force required by a driver of said automotive vehicle; means for inferring a driving force after the speed change ratio shifting operation of said automatic transmission for each speed change ratio which is obtainable by said speed change ratio shifting operation of said automatic transmission; means for calculating a deviation between said driving force required by the diver and said driving force after the speed change ratio shifting operation as a first parameter for said each speed change ratio; means for calculating a given condition of said automotive vehicle as a second parameter value for said each speed change ratio; means for determining membership values of said first and said second parameters in accordance with membership functions of said first and second parameters for said each speed change ratio, selecting an optimum speed change ratio based on said membership values of said first and said second parameters for said each speed change ratio, and producing an output signal corresponding to said optimum speed change ratio; and means, responsive to said output signal, for controlling said speed change ratio shifting operation of said automatic transmission to achieve said optimum speed change ratio.
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22. In a shift control system for an automatic transmission of an automotive vehicle based on fuzzy control, a method for controlling a speed change ratio shifting operation comprising the steps of:
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(a) producing a signal representative of a driving force required by a driver of said automotive vehicle; (b) producing a signal representative a driving force after a speed change ratio shifting operation; (c) producing a signal representative of a deviation between the signal representative of the driving force required by the driver and the driving force after the speed change ratio shifting operation; (d) producing a signal representative of a given condition of said automotive vehicle; (e) repeating steps (b)-(d) for each speed change ratio obtainable by said shift control system; and (f) producing for said each speed change ratio signals corresponding to membership values derived from membership functions of the deviation and the given condition of said automotive vehicle; (g) selecting an optimum speed change ratio based on said signals corresponding to said membership values; and (h) controlling said speed change ratio shifting operation of said automatic transmission to achieve said optimum speed change ratio.
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Specification