Processing of IC engine ionic current signals for engine control functions

摘要

The method involves performing offset correction of the ionic current signals, and then performing masking and multiplexing operations of the signals. The method involves measuring the ionic current signal (s1) in each cylinder, for offset correction before each ignition operation, and then determining the level of the measuring signal of each cylinder. During a masking operation, the measuring signal in a second signal (s2), which is extracted from the measuring signal, is replaced by the value of the level of the signal in each cylinder and is also subtracted from the signal until the next ignition operation. The channels for multiplexing, are combined together by addition of the signals of the relevant cylinder to produced a third signal (s3). An Independent claim is included for a device for processing the ionic current signals.