| 摘要 |
<p>A multirate real-time control system 102 is represented as a set of interconnected functional blocks. Subsets of the functional blocks are defined as subsystems of the multirate real-time system 102, with at least one of the subsystems including a fuzzy logic functional block 150, called a fuzzy logic subsystem. A double buffer 120 interface includes an output buffer 125,126 and a sample and hold buffer 128. The output signal buffer 125, 126 holds output signal values generated by the functional blocks. Prior to executing the computations associated with each subsystem, all input signal values to be used by the subsystem's computations are copied into the sample and hold buffer 128. The input signal values copied into the sample and hold buffer 128 are held invariant during execution of the subsystem's computations, whereby a consistent set of input signal values is presented to each subsystem, including the fuzzy logic subsystem 150. Each fuzzy logic subsystem 150 has a set of membership curves 162, a fuzzifier module 152 for converting crisp input signal values into fuzzy logic values, a connective logic module 154 for combining fuzzy logic values in accordance with defined rules to produced one or more output fuzzy values, an implication operator module 156 for applying each output fuzzy value to a corresponding membership curve to produce an implicated assertion curve, a defuzzifier module 158 for computer a crisp output value as a function of each implicated assertion curve, and an aggregation module 160 for combining two or more crisp output values. <IMAGE></p> |
