| 摘要 |
PROBLEM TO BE SOLVED: To provide an abnormality detection device of an internal combustion engine capable of identifying "leakage of an intake system" from abnormality of a sensor used for acquiring a cylinder intake air volume, and determining it. SOLUTION: In this device, abnormality of an internal combustion engine is detected when a difference (air amount difference) between a first cylinder intake air amount Ma1 based on measuring results of an airflow sensor and a second cylinder intake air amount Ma2 based on detection results of a sensor for detecting a condition, an amount and the like in an intake manifold is large. When abnormality of the internal combustion engine is detected, and when it is determined that "the larger the difference between an intake pressure Pm and an outside air pressure Pa is, the larger the air amount different tends to be", it is determined that "there is leakage in the intake system". Meanwhile, when it is determined that there is no such tendency, it is determined that "there is abnormality" in various sensors for acquiring Ma1, Ma2. This determination is based on the tendency when leakage of the intake system occurs in an intake passage downstream of an airflow sensor. COPYRIGHT: (C)2009,JPO&INPIT
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