Patent ID: 8260529
Filing Date: 2012-09-04
Classification: F02P

Abstract:
1. An internal combustion engine ignition controlling apparatus having an ignition diagnosing function, said ignition controlling apparatus comprising: an ignition apparatus that generates a spark discharge for igniting fuel that has been supplied into an internal combustion engine combustion chamber; an ignition coil that generates and applies to said ignition apparatus a high voltage for generating said spark discharge; a controlling apparatus that issues an ignition signal to said ignition coil a plurality of times in a single stroke; a bias device that is disposed on said ignition coil and that generates and applies to said ignition apparatus a bias voltage that has a reverse polarity to a polarity of said high voltage; a signal extracting device that is disposed on said controlling apparatus and that extracts a signal that is generated as a result of application of said bias voltage; and a signal diagnosing device for diagnosing a state of said spark discharge based on output from said signal extracting device, wherein: said signal extracting device sets a predetermined detection zone from a period within said stroke of said internal combustion engine from a first spark discharge commencement until after a last spark discharge completion, and extracts a signal in said detection zone; and said signal diagnosing device determines a state of ignition using parameters included in said extracted signal in said predetermined detection zone, and controls said internal combustion engine in response to said determination.