Gated knock detector for internal-combustion engines

F - Mech Eng,Light,Heat,Weapons – 02 – P

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341/16

F02P 5/04 (2006.01) F02D 35/02 (2006.01) G01L 23/22 (2006.01)

Patent

CA 1264079

ABSTRACT OF THE DISCLOSURE A system for use with an internal combustion engine which reduces, or eliminates, engine knock and attendant engine damage. An audio transducer is placed on an engine cylinder to convert audio signals occurring within the combustion chamber into an electrical signal. This signal is sampled and filtered and the amplitudes of two time-sequenced segments are compared. One of these segments is timed for an interval during which detonation, if any, is likely to occur, and the other of these segments is timed for an interval-during which no detonation is likely to occur. When the amplitude of the sample from the segment of likely detonation exceeds the amplitude of the sample from the segment of unlikely detonation, by a predetermined amount, extra fuel is momentarily added to the combustion chamber to slow down the rate of combustion and cool the walls of the combustion chamber.

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