ABNORMALITY DIAGNOSIS APPARATUS AND ABNORMALITY DIAGNOSIS METHOD

摘要

An abnormality diagnosis apparatus is an apparatus that diagnoses a fuel leak from a fuel passage to circulate a liquefied gas fuel between a fuel tank and an internal combustion engine. The abnormality diagnosis apparatus includes: a control device; a low-pressure temperature sensor arranged at a discharge port of a feed pump; and a high-pressure temperature sensor arranged at an overflow fuel emission port of a supply pump. The control device detects a decrease in the temperature of the liquefied gas fuel at the overflow fuel emission port on the basis of a comparison between the measured values of the two temperature sensors, thereby determining that the fuel leak is caused in a section from the discharge port to the overflow fuel emission port.

主权项

1. An abnormality diagnosis apparatus that diagnoses a fuel leak from a fuel passage to circulate a liquefied gas fuel between a fuel tank and an engine, the abnormality diagnosis apparatus comprising:
a first measuring part that is arranged at a first part of either of the fuel tank and the fuel passage and that measures a temperature of the liquefied gas fuel; a second measuring part that is arranged at a second part different from the first part of the fuel passage and that measures the temperature of the liquefied gas fuel; and a determination part that detects a decrease in the temperature of the liquefied gas fuel at the second part on the basis of a comparison between a measured value of the first measuring part and a measured value of the second measuring part, thereby determining that the fuel leak is caused in a section between the first part and the second part of the fuel passage.