| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly efficient estimating method of illustrated accurate average effective pressure while reducing a burden of arithmetic processing in a control system. SOLUTION: This estimating method of the illustrated average effective pressure of an internal combustion engine, calculates an effective pressure index Si1 of a combustion section on the basis of an operation of cylinder internal pressure measured by a cylinder internal pressure detecting sensor 4 in the combustion section, by dividing a combustion cycle of an engine 1 into the combustion section C1 over the middle period of an expansion stroke from the last period of a compression stroke and noncombustion sections A, B, D and E except for the combustion section, and dividing the noncombustion section into an intake stroke, the compression stroke, the expansion stroke and an exhaust stroke; and estimates effective pressure indexes Si2 to Si4 of the respective strokes from a map corresponding to an operation state of the engine 1 in the noncombustion section; and determines illustrated average effective pressure IMET of the internal combustion engine on the basis of the effective pressure index of the combustion section and the effective pressure indexes of the respective strokes in the noncombustion section. COPYRIGHT: (C)2007,JPO&INPIT
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