4 results about "Fuzzy rule" patented technology

The invention provides a fan regulation and control method and device for conducting fuzzy control on multiple temperature sensors, and belongs to the technical field of fan regulation and control. Obtaining the reading of each temperature sensor, and calculating the membership degree of each temperature to the front temperature condition of the rule; obtaining a fuzzy operator of each fuzzy rule, and carrying out operation on each membership degree of the front temperature condition of the fuzzy rule to obtain a weight of the front temperature condition of the fuzzy rule; the weights of the front temperature conditions of all the fuzzy rules are applied to the rear rotating speed conclusion of the same fuzzy rule, curves of the rear rotating speed conclusion are obtained, all the curves are combined, and a fuzzy set of all the fuzzy rules is obtained; and performing defuzzification on the curves of all the fuzzy rules to obtain the rotating speed of the fan, and adjusting the rotating speed of the fan. The fan rotating speed is directly calculated according to the temperature by using the fuzzy control algorithm, so that the problem of CPU downtime caused by untimely temperature control is avoided.

The invention provides an adaptive rate selecting algorithm based on vehicle safety communication. When a fuzzy decision is utilized to perform selection of message transmission rate according to fading packet loss and interference packet loss, a large number of fuzzy rules and parameter sets are required to be designed, and the work is very complicated and even cannot be finished for a designer.All parameters are initialized, PLRAVG, PLRINT and PLRFAD are assigned to 0, an optimal rate is set as a base rate (3Mbps); each node adopts Sym2PLR to perform estimation of average packet loss PLRAVGin local according to a channel symmetry principle; Dis2PLR is adopted to perform the estimation of fading packet loss PLRFAD according to a relative distance of each node calculated by an application layer; influence PLRINT caused by interference on packet loss is obtained according to the first two steps; a fuzzy decision FuzzyRateSelection is adopted, an optional rate BestBitRate under the current environment is obtained according to the PLRFAD and the PLRINT and is returned. The design complexity of a fuzzy system is simplified.