Knocking detecting device for internal combustion engine and met

Details Knocking detecting device for internal combustion engine and met Knocking detecting device for internal combustion engine and met

1992-03-06

1994-09-20

Williams, Hezron E.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

053478460

ABSTRACT:
Knocking detecting in an internal combustion engine uses, a vibration sensor detecting engine vibrations; and insert for taking-in output vibration signals from the vibration sensor in a plurality of intervals in a time sequential manner during every explosion stroke of the internal combustion engine; performing a digital frequency analysis on the taken-in output vibration signals in the respective sequential intervals; setting a main resonance frequency necessary for knocking occurrence judgement based upon the instant operating condition of the internal combustion engine; calculating knocking indexes for the digital frequency-analyzed output vibration signals in the respective sequential intervals based upon the set main resonance frequency component; comparing the largest knocking index calculated with a predetermined threshold value determined by a background vibration level and a slice level thereof to determine occurrence of knocking; and renewing the respective background vibration levels using the calculated knocking indexes when no knocking occurrence is determined. With such an operation a knocking detection with a high S/N ratio and a high sensitivity is achieved.

REFERENCES:
patent: 4694800 (1987-09-01), Morita
patent: 4991553 (1991-02-01), Kurihara
patent: 5092160 (1992-03-01), Veda

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