Apparatus for detecting abnormality of glow plugs

摘要

An apparatus for detecting abnormality of a glow plug (22) without using special circuits or devices. The glow plug (22) is arranged in a diesel engine (2) and is heated by current supplied from a power supply to help start the diesel engine. The apparatus includes a controller (52) that controls the current supplied from the power supply to the glow plug (22). The controller changes the state of the current and determines abnormality of the glow plug based on the difference between an operating condition of the diesel engine before and after the change.