Patent ID: 7133761

Claim:
A method of controlling combustion of a fuel within a combustion chamber of internal combustion engine, said method comprising, a. during a cycle of said engine: i. introducing a charge into said combustion chamber, ii. compressing said charge within said combustion chamber, iii. introducing said fuel into said combustion chamber, iv. burning said fuel within said combustion chamber to drive a piston disposed within said combustion chamber, b. delivering an accelerometer data set to a controller, said accelerometer data set collected during at least two cycles of said engine, c. processing said accelerometer data set to generate a processed data set indicative of a heat release rate over said at least two cycles, d. estimating from said processed data set, an SOC error using a pre-determined target start of combustion for said fuel, e. if the magnitude of said SOC error is greater than 0, adjusting a start of combustion lever for at least one subsequent cycle of said engine to drive a corrected start of combustion during said at least one subsequent cycle towards said pre-determined target start of combustion.