Knock detection device

Details Knock detection device Knock detection device

2005-04-19

2005-04-19

Chapman, John E. (Department: 2856)

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

C701S111000

Reexamination Certificate

active

06880381

ABSTRACT:
A knock detection device that can not only detect knock accurately, but can also detect heavy knock quickly. Cylinder pressure is detected by a pressure sensor installed in each cylinder in an internal combustion engine. AS the occurrence or non-occurrence of heavy knock is determined based on the ratio between the maximum value of cylinder pressure fluctuation and the maximum value of cylinder pressure divided by a prescribed value, it becomes possible to detect the occurrence of heavy knock quickly. If it is determined that heavy knock has occurred, a knock suppression measure involving, for example, reducing the spark advance angle, is immediately applied, thus preventing damage to the internal combustion engine.

REFERENCES:
patent: 5664544 (1997-09-01), Tomisawa
patent: 6810320 (2004-10-01), Yamamoto et al.
patent: 2001-32744 (2001-02-01), None
Patent Abstract of Japan, Publication No. 2001032744 A, Published on Feb. 6, 2001, in the name of Sato, et al.

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