Device for detecting the knock phenomena in internal combustion engines having a controlled-ignition device, based on the use of temperature sensors

Claim 1

A controlled-ignition internal combustion engine of the type having a spark plug and a piston for each cylinder, said engine having an ignition system for causing electric discharge at the spark plug with a determined basic regulation of ignition advance relative to the upper dead center of the respective piston, said engine also having a device for detecting the occurrence of the knock phenomenon in an explosion chamber of at least one of the engine cylinders, said device comprising two separate temperature sensors separately arranged in exposed relation in said chamber, one of said sensors being arranged in a zone of said chamber farthest from the spark plug in which generally the phenomenon of incipient knocking is experienced, the other of said sensors being arranged in a zone of said chamber near the spark plug in which said incipient knocking phenomenon does not occur, said device further comprising an electronic circuit for receiving and comparing signals coming from said sensors so as to detect if the engine is operating under knock conditions.