| 摘要 |
<p>Provided are a fuel leakage diagnostic device and a fuel leakage diagnosis method with which it is easy to diagnose whether there is leakage of highly compressed fuel from a leak-proof pressurized storage-type fuel delivery device. The fuel leakage diagnostic device diagnoses whether there is fuel leakage from a leak-proof pressurized storage-type fuel delivery device equipped with a high-pressure fuel system, which comprises a high-pressure pump for pumping a highly compressed fuel, a common rail where the highly compressed fuel pumped from the high-pressure pump is stored, and fuel injection valves for injecting the highly compressed fuel stored in the common rail into the cylinders of an internal combustion engine. The fuel leakage diagnostic device is equipped with a pressure detection unit that reads the pressure of the high-pressure fuel system and stores the pressure reading, a retention control unit that retains the fuel inside the high-pressure fuel system while the internal combustion engine is stopped, and a fuel leakage determination unit that determines whether there is fuel leakage by checking changes in the pressure in the high-pressure fuel system after retention of the fuel in the high-pressure fuel system has been started.</p> |
