Patent ID: 10947908

Abstract:
A controller according to the present disclosure, in each combustion cycle that composes a change cycle, calculates the average μn of control amounts from the first combustion cycle to the nth (1<=n<=N) combustion cycle and calculates the error μn-μo of the average μn with respect to the average μo of a reference normal population. Also, the controller sets both a positive threshold Zα/2*σo/n1/2 and a negative threshold −Zα/2*σo/n1/2 based on the standard error σo/n1/2 of the reference normal population in the case where the number of data is n. Then, the controller chooses an operation amount to be changed from a plurality of operation amounts, based on a comparison between a series of the errors μn-μo and a series of the positive thresholds Zα/2*σo/n1/2 and a comparison between the series of the errors μn-μo and a series of the negative thresholds −Zα/2*σo/n1/2.