Patent ID: 7069140
Filing Date: 2006-06-27
Classification: F02D

Abstract:
1. A method of determining correct engine phase of an internal combustion engine without the need for a cam sensor, wherein said internal combustion engine comprises a first set of cylinders whose power stroke occurs during a first revolution of said crankshaft, and a second set of cylinders whose power stroke occurs during a second revolution of said crankshaft, and an engine controller unit that receives a signal stream responsive to rotation of said crankshaft, said method comprising: cranking said engine in a mode selected from the group consisting of a phase shifted 4-stroke mode; a true 2-stroke mode; and a partial semi-2-stroke mode; setting engine mode to a mode selected from the group consisting of same-phase 4-stroke mode and full semi-2-stroke mode; and observing changes in an engine indicator responsive to firing of said cylinders, wherein based on said changes, correct engine phase is determined.