1994-03-01

Locating the Main Conversion Period Exactly, Using a Newly Developed Characteristic Value of the Combustion Pressure in an SI Engine 940147

This paper describes a new way to locate the position of the combustion process in a spark-ignited engine. This method uses a characteristic value which is calculated from indicated high pressure (Pmax). This calculation requires much less time than traditional methods and allows the on-board-management (OBM) system to predict misfire cycles, and therefore, to avoid them.
The new characteristic value correlates closely to given percentages of the rate of converted energy, and has been tested using high relative air/fuel ratios (λ), high rates of exhaust gas recirculation (EGR), and different fuels. Use of this method in the OBM system allows extremely sensitive adjustments of ignition timing (αIG), which maximize efficiency and minimize pollutant emissions.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X