Patent Number: 7,711,498

Title: Glow plug degradation determination device

Abstract: A glow plug degradation determination device energizes a glow plug immediately after an operation of an internal combustion engine is stopped. When a preset energization time elapses, the device senses a sensing value corresponding to resistance of the glow plug. The device determines degradation of the glow plug based on the sensing value. When the device determines that the glow plug is degraded, the device stores a result of the determination and reports the degradation of the glow plug before a next start. The device provisionally determines the degradation of the glow plug based on the sensing value during the operation of the internal combustion engine. After the device provisionally determines the degradation to be present, the device determines the degradation of the glow plug immediately after the operation of the internal combustion engine is stopped.

Inventors: Hiramatsu; Hiromi (Kariya, JP)

Assignee: Denso Corporation

International Classification: G01B 7/00 (20060101)

Expiration Date: 5/04/12018