Engine residual gas amount estimation device and residual gas amount estimation method

摘要

PPROBLEM TO BE SOLVED: To provide a device capable of accurately estimating a residual gas quantity in a combustion chamber even if a flow of gas blown out of an exhaust port from the combustion chamber is brought into a choke state. PSOLUTION: This device is provided with a means 31 determining whether pressure in a combustion chamber is in a compression state in an exhaust stroke or not based on a combustion chamber inside-volume change quantity by a combustion chamber inside volume change, and a quantity of gas capable of passing through an exhaust valve, and a means 31 calculating a choke state start crank angle when the combustion chamber inside-pressure is compressed in the exhaust stroke, calculating combustion chamber inside-pressure at intake valve open timing in the choke state of the flow of gas blown out of the combustion chamber to an exhaust port based on the choke state start crank angle, calculating the quantity of gas blown out to the exhaust port from the inside of the combustion chamber based on combustion chamber inside-pressure at the intake valve close timing, and estimating the quantity of combustion chamber inside-residual gas after the completion of overlap based on the blown-out gas quantity and the combustion chamber inside-gas quantity at intake valve open timing. PCOPYRIGHT: (C)2009,JPO&INPIT