KNOCKING DETECTOR FOR INTERNAL COMBUSTION ENGINE

Title:

KNOCKING DETECTOR FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

Japanese Patent JPH07306119

Kind Code:

A

Abstract:

PURPOSE: To detect the attaching looseness of a knocking sensor quickly and accurately.

CONSTITUTION: The output based on the knocking generated in an internal combustion engine from a knocking sensor 8 is amplified by a gain switch 12. The output is divided into a plurality of frequency bands by a digital filter 5 provided in a DSP 13. The abnormality of the knocking sensor 8 is detected by a knocking judging means 6 provided in the DSP 13 by using the specified frequency band among a plurality of the frequency bands. In this way, the attaching looseness of the knocking sensor 8 is accurately detected by using the specified frequency band in the output characteristics in detection of the knocking generated in the internal combustion engine from the knocking sensor 8.

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Inventors:

NAKAI KAZUHIRO
KAMADO KOICHI
HARAGUCHI HIROSHI

Application Number:

JP10033994A

Publication Date:

November 21, 1995

Filing Date:

May 16, 1994

Export Citation:

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Assignee:

NIPPON DENSO CO

International Classes:

G01H17/00; F02D45/00; G01M15/00; (IPC1-7): G01M15/00; F02D45/00; G01H17/00

Attorney, Agent or Firm:

Higuchi Takehisa

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