Patent ID: 7424820
Filing Date: 2008-09-16
Classification: G01L

Abstract:
1. A knocking state determination device in an internal combustion engine, comprising: a knock intensity calculator calculating a knock intensity relating to an intensity of vibration caused due to knocking; an indicator indicating ignition timing of said internal combustion engine based on a result of comparing said knock intensity with a determination value; a detector for detecting a plurality of intensity values relating to an intensity of vibration caused in said internal combustion engine; a calculator for calculating a second value based on an intensity value not more than a first value chosen among said plurality of intensity values; a corrector for correcting said first value such that a deviation between said first value and said second value becomes smaller than a predetermined deviation when the deviation between said first value and said second value is larger than said predetermined deviation; and a determiner for determining a knocking occurrence state based on an intensity value larger than at least one value of said first value corrected and a second value calculated based on an intensity value not more than said first value corrected; and a determination value corrector correcting said determination value based on the knocking occurrence state determined based on said intensity value.