INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine includes an exhaust valve, a plurality of cams Ca, Cb, and Cc used to drive the exhaust valve, a cam-switching variable valve mechanism that selects a use cam used to drive the exhaust valve out of the plurality of cams Ca, Cb, and Cc, and an electronic control unit that determines whether switching abnormality of the use cam in the variable valve mechanism is present on the basis of a locus M in a predetermined period K which is a period in which the exhaust valve is opened. The locus M is a locus of an in-cylinder pressure changing rate dPc/dθ and is specifically a locus indicating a variation of the in-cylinder pressure changing rate dPc/dθ depending on a crank angle θ.

主权项

1. An internal combustion engine comprising:
a variable valve mechanism including a plurality of cams used to drive an exhaust valve; and an electronic control unit configured to
(a) select a use cam, which is a cam used to drive the exhaust valve, out of the plurality of cams, and(b) determine whether switching abnormality of the use cam is present on the basis of a locus of an in-cylinder pressure changing rate in a predetermined period, the predetermined period being a period in which the exhaust valve is opened.