METHOD AND SYSTEM TO DETERMINE LOCATION OF PEAK FIRING PRESSURE

A method or system 25 to determine peak firing pressure of a cylinder of an engine 10 having a crank shaft. The method includes accessing a knock signal received from a knock sensor 23 of the cylinder. The method includes determining a location of peak firing pressure based at least in part on the knock signal. The location of peak firing pressure is associated with combustion of the engine 10 and corresponds to a time or a crank angle of the crankshaft. The method includes generating an indication of the location of peak firing pressure.