| 摘要 |
PROBLEM TO BE SOLVED: To estimate an in-cylinder charging-air amount with high accuracy without using charging efficiency. SOLUTION: In this estimation device, an intake system model for calculating the in-cylinder charging-air amount Me is derived by applying the law of conservation of mass and the state equation of gas to intake air flowing through an intake passage from a throttle valve 15 to an intake port of an engine 11. An intake system model equation is Me=Mth-V/RT.dP/dt, wherein Me is the in-cylinder charging-air amount, V is an inner volume of the intake passage on the downstream of the throttle valve 15, R is the gas constant, T is an intake temperature, and dP/dt is an intake pressure change amount. A deviation (i.e., a pseudo differential value) between a detection value of an intake pressure sensor 18 and an averaging value of the detection value is used as the intake pressure change amount (dP/dt) to eliminate influence of noise (an intake pulsation waveform) superimposed on the detection value of the intake pressure sensor 18.
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