Device and method for determining knocking of internal combustion engine

A method of determining knocking of an internal combustion engine, comprising the steps of:

• detecting a magnitude of vibration of said internal combustion engine;
• calculating a first value according to the magnitude of vibration of said internal combustion engine;
• determining whether or not knocking has occurred in said internal combustion engine based on a result of comparison between said first value and a predetermined second value;
• correcting said second value based on magnitudes detected in a plurality of ignition cycles;
• setting at least one of an upper limit and a lower limit of said second value based on said magnitudes detected in said plurality of ignition cycles;
• and
• restricting said second value so that said second value is within at least one of said upper limit and said lower limit.

A device for determining knocking of an internal combustion engine, comprising:

• means for detecting a magnitude of vibration of said internal combustion engine;
• means for calculating a first value according to the magnitude of vibration of said internal combustion engine;
• means for determining whether or not knocking has occurred in said internal combustion engine based on a result of comparison between said first value and a predetermined second value;
• means for correcting said second value based on magnitudes detected in a plurality of ignition cycles;
• means for setting at least one of an upper limit and a lower limit of said second value based on said magnitudes detected in said plurality of ignition cycles;
• and
• means for restricting said second value so that said second value is within at least one of said upper limit and said lower limit set by said means for setting.