ENGINE CONTROL DEVICE

摘要

In order to solve a problem that in an internal combustion engine in which abnormal combustion (knocking or an accidental fire) of an engine is detected from an ion signal, the setting of an abnormal combustion determination threshold value under a transient condition in which an engine operating state abruptly changes is difficult to thereby cause erroneous determination, the present invention is an engine control device provided with an ion signal detection means for detecting ions generated during combustion, and provided with an abnormal combustion determination means for determining knocking or an accidental tire according to an ion signal detected by the detection means, the engine control device being characterized by being provided with an in-cylinder temperature estimation means for estimating the in-cylinder temperature in a normal combustion cycle under a current operating condition of the engine, and by setting the knocking determination threshold value or accidental fire determination threshold value of the ion signal on the basis of the estimated in-cylinder temperature information. Consequently, it becomes possible to accurately detect abnormal combustion even under a transient operating condition.

主权项

1. An engine control device including an ion signal detection means for detecting ions generated during combustion and an abnormal combustion determination means for determining an occurrence of knocking or misfiring by means of an ion signal detected by the detection means, the engine control device comprising:
an in-cylinder temperature estimation means for estimating an in-cylinder temperature in a normal combustion cycle under current operating conditions of an engine, wherein a knocking determination threshold value or a misfiring determination threshold value of the ion signal is set on the basis of estimated in-cylinder temperature information.