COMBUSTION PRESSURE DATA COLLECTING SYSTEM FOR MULTI-CYLINDER ENGINE

PROBLEM TO BE SOLVED: To efficiently collect combustion pressure data for every cylinder in simple construction without requiring complicated processings. SOLUTION: This system comprises a cylinder pressure sensor CPS#n for directly detecting combustion pressure in each cylinder, an amplifier unit AP#n converting a change signal from the cylinder pressure sensor CPS#n to a voltage signal and having automatic correcting function of automatically correcting voltage to be output at the same level before and after the cylinder pressure sensor CPS#n generates electric charge, and a channel switching unit MUX to which the amplifier unit AP#n for each cylinder is connected. Depending on a channel selecting signal output from an electronic control unit for controlling an engine, a line signal to be measured of a plurality of line signals from the amplifier unit AP#n is selected so that the combustion pressure data is output to an ECU. Thus, the combustion pressure data for every cylinder is efficiently collected in simple construction without requiring complicated processings. COPYRIGHT: (C)2005,JPO&NCIPI