Combustion engine controller applying correction for misfiring - compares stored value of ion current measurement with reference level before ignition coil is switched on

摘要

A crankshaft reference position signal (1) is used in conjunction with the outputs of sensors (2) of engine operating conditions and of an ion current detector (20) monitoring the state of combustion in one cylinder. The control parameters of the engine are corrected (31) on the basis of a misfiring detection signal (c) produced (32) when the ion current falls short of a reference level. The detector circuit includes a memory for storing the measured value, a device for reading it immediately before power supply to the ignition coil, and a comparator of the readout and reference values. ADVANTAGE- Dependability of misfiring recognition is increased by prevention of erroneous ion current level readings due to superposed noise. ADVANTAGE - The dependability of recognition of misfiring is increased by prevention of erroneous ion current level readings due to superimposed noise.