| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for accurately calculating combustion noise in an internal combustion engine. SOLUTION: The combustion noise in the internal combustion engine is calculated from an expression of CN=A×log<SB>10</SB>(Pmax)<SP>n1</SP>+B×log<SB>10</SB>(ΔPmax)<SP>n2</SP>+C×log<SB>10</SB>(dΔP/dt)<SP>n3</SP>+D×log<SB>10</SB>(d<SP>2</SP>ΔP/dt<SP>2</SP>)<SP>n4</SP>+E×log<SB>10</SB>(1/Ne)+F. Where, the combustion noise in the internal combustion engine is CN, a maximum value of cylinder pressure during a compression stroke and an exhaust stroke is Pmax, a maximum value of an increased amount of the cylinder pressure by combustion of fuel isΔPmax, a maximum value of a first-grade time differential value of an increased amount of cylinder pressure in fuel combustion is dΔP/dt, a maximum value of a second-grade time differential value of an increased amount of cylinder pressure in fuel combustion is d<SP>2</SP>ΔP/dt<SP>2</SP>, and speed of the internal combustion ending is Ne. Wherein, A, B, C, D, E, F, n1, n2, n3, and n4 are coefficients. COPYRIGHT: (C)2008,JPO&INPIT
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