Desired performance input fuzzy logic control system for automatic transmissions
First Claim
1. A fuzzy logic control system, for changing a ratio of an automatic transmission, comprising:
- detection means for detecting input variables derived from a driver-vehicle system, said input variables comprising at least one of a throttle valve position and an absolute accelerator pedal position, and at least one adjustment dynamic thereof;
actuator means for changing a ratio of the automatic transmission; and
fuzzy processing means for determining output variables with which the transmission ratio is determined in order to control the actuator means, the fuzzy processing means having fuzzy generation means for generating related functions in the form of fuzzy sets for said input variables, and the fuzzy processing means determining the output variables according to the input variable fuzzy sets and a set of basic and additional fuzzy generating rules;
wherein at least one of the throttle valve position and the absolute accelerator pedal position and at least one adjustment dynamic thereof are processed in a fuzzy module according to fuzzy rules based on a representative cross section of drivers, independent of an actual driving manner, to provide an output which represents a desired performance of the driver and forms a further input variable for the fuzzy processing means and thereby the set of basic and additional fuzzy generating rules.
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Abstract
The invention concerns a control system for shifting gears in an automatic shift transmission (3) by using fuzzy logic methods. Vehicle parameters form input variables (8) that are continuously detected by appropriate means (9). These input variables are further processed in downstream functional blocks (11, 12, 13, 14, 15, 16 and 17). Gearshifting points that ensure an economical driving are determined in the functional block (11) according to fuzzy logic methods. Besides a set of basic fuzzy logic generating rules, additional rules are used to improve driving. For that purpose, the input quantity "desired performance" is taken into consideration in both sets of rules. The desired performance may be a desired acceleration or a desired deceleration. A closed regulation circuit is formed by converting the fictitious quantity desired performance and the quantity driving manner to a physical quantity.
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Citations
17 Claims
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1. A fuzzy logic control system, for changing a ratio of an automatic transmission, comprising:
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detection means for detecting input variables derived from a driver-vehicle system, said input variables comprising at least one of a throttle valve position and an absolute accelerator pedal position, and at least one adjustment dynamic thereof; actuator means for changing a ratio of the automatic transmission; and fuzzy processing means for determining output variables with which the transmission ratio is determined in order to control the actuator means, the fuzzy processing means having fuzzy generation means for generating related functions in the form of fuzzy sets for said input variables, and the fuzzy processing means determining the output variables according to the input variable fuzzy sets and a set of basic and additional fuzzy generating rules; wherein at least one of the throttle valve position and the absolute accelerator pedal position and at least one adjustment dynamic thereof are processed in a fuzzy module according to fuzzy rules based on a representative cross section of drivers, independent of an actual driving manner, to provide an output which represents a desired performance of the driver and forms a further input variable for the fuzzy processing means and thereby the set of basic and additional fuzzy generating rules. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A control system (10) for changing the ratio of an automatic transmission, the control system (10) having means (9) for detecting input variables derived from a driver-vehicle system, means for generating related functions for said input variables, and means for changing transmission ratios, said means for detecting the input variables, said means for generating related functions and said means for changing the transmission ratios interacting so as to find, according to fuzzy generating rules, output variables with which a transmission ratio is determined,
wherein a throttle valve position, an adjusting dynamic, and a driving manner produce, according to fuzzy generating rules, a physical quantity in the form of one of excess traction and excess torque, which is fed as a nominal value to a regulation circuit which contains as a feedback value the actually existing excess traction (calculated from F=m×
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17. A fuzzy logic control system, for changing the ratio of an automatic transmission, comprising:
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detection means for detecting input variables derived from a driver-vehicle system; generating means for generating related functions in a form of fuzzy sets for said input variables; desired-performance determination means for generating a desired-performance output according to the input variables detected by the detection means, said input variables being at least one of a throttle valve position and an absolute accelerator pedal position and at least one adjustment dynamic thereof; output determination means for determining output variables according to fuzzy generating rules and said fuzzy sets, said fuzzy generating rules containing at least a set of basic rules and additional rules, and the output determination means receiving the input variables and the desired performance output as inputs; and means for changing a transmission ratio of the automatic transmission according to said output variables.
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Specification