Knock detection method and knock detection device

Abstract

The invention provides a knock detection method and a knock detection device. The knock detection method has: an in-cylinder pressure acquisition step for acquiring in-cylinder pressures of a cylinderof an internal combustion engine at a plurality of crank angles; a heat generation rate calculation step for calculating heat generation rates of the cylinder at the plurality of crank angles; an in-cylinder pressure maximizing crank angle acquisition step for acquiring an in-cylinder pressure maximizing crank angle; a knock determination crank angle region determining step for determining a knock determination crank angle region, which is a region between a small-side crank angle that is less than the in-cylinder pressure maximizing crank angle by a first value and a large-side crank angle that is greater than the in-cylinder pressure maximizing crank angle by a second value; a heat generation rate differentiation step for calculating a differential value of the heat generation rate in the knock determination crank angle region; and a first knock determination step for performing a knock determination on the basis of the differential value of the heat generation rate, calculated in the heat generation rate differentiation step.

Description

technical field [0001] The invention relates to a knock detection method and a knock detection device of an internal combustion engine. Background technique [0002] In general, internal combustion engines such as gas engines and gasoline engines are more efficient as the ignition timing is earlier in each combustion cycle. On the other hand, the earlier the ignition timing is, the higher the possibility of occurrence of knocking which is an abnormal combustion phenomenon in which unburned exhaust gas spontaneously ignites (natural ignition) in the cylinder occurs. In addition, the shock wave generated by the self-ignition destroys the thermal boundary layer formed on the inner wall surface of the cylinder, thereby excessively increasing the surface temperature of the inner wall surface of the cylinder, causing damage to the internal combustion engine such as engine parts such as the cylinder block being melted and damaged. Therefore, in order to avoid damage to the interna...

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Problems solved by technology

In particular, only strong detonation can cause damage to the internal combustion engine

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