| 摘要 |
PROBLEM TO BE SOLVED: To perform automatic control so that an oiling rate always converges to an optimum value.SOLUTION: An iron concentration 17a of lube oil correlated by a piston ring and a state of a cylinder liner and an iron concentration variation rate 30a of the iron concentration variation per unit time are inputted. The iron concentration 17a is defined as a fuzzy set A with ZO, PS, PM, PL, PG set from a small concentration, and the iron concentration variation rate 30a is defined as a fuzzy set B with ZO of the variation rate 0 as the center, PS, PB as +, and NS, NB as -. The grade of the fuzzy set C of respective outputs corresponding to states of the input fuzzy set A and the input fuzzy set B is inferred by using the fuzzy reasoning rule, and a center of gravity of the membership functions is calculated that are synthesized by superposing membership functions obtained by cutting the fuzzy set C of the respective inferred outputs with the grade value, and the obtained center of gravity is used as an increase and decrease width for the present oiling rate to increase or decrease the oiling rate. |
