Patent ID: 8613218
Filing Date: 2013-12-24
Classification: F02D

Abstract:
1. A leakage mechanism diagnosis apparatus for use in an internal combustion engine, the engine including a high-pressure fuel path extending from a high-pressure fuel pump to a fuel injection valve, and a leakage mechanism for reducing fuel pressure in the high-pressure fuel path by leaking fuel from the high-pressure fuel path, the apparatus comprising: a fuel pressure detecting section arranged in the high-pressure fuel path, the fuel pressure detecting section detecting the fuel pressure in the high-pressure fuel path; and a diagnosing section for diagnosing the presence/absence of an abnormality in fuel leakage performed by the leakage mechanism based on the fuel pressure detected by the fuel pressure detecting section, wherein the diagnosing section does not perform the diagnosis after duration of a stopped state of the internal combustion engine exceeds a predetermined time period.