Patent ID: 7013871
Filing Date: 2006-03-21
Classification: F01N,F02D,F02M,F02P,Y02T

Abstract:
1. A method of controlling engine ignition timing, comprising using estimated MBT timing criterion and ignition diagnostics to control the engine ignition timing, wherein said ignition diagnostics comprises knock and misfire information, wherein said step of using estimated MET timing criterion and ignition diagnostics to control engine ignition timing, comprises the following steps: calculating said MBT timing criterion, said knock information and said misfire information; generating an error signal by comparing said MBT criterion with a reference signal; outputting said error signal to a controller; producing a proportional error signal by multiplying said error signal by a proportional gain; producing an integrated error signal by integrating said error signal with an integral gain; resetting said integrated error signal if an engine is knock or misfire limited; outputting a feedforward signal; and outputting a timing signal by summing said proportional error signal, said integrated error signal and said feedforward signal.