1973-02-01

Spark Ignition Engine Control Variables Study 730004

Systematic testing of a fuel injected 429 in3 (7.03 dm3) V-8 engine at steady states produced data from which the effects on emissions of three control variables in combination could be determined. Plotted data of brake specific nitric oxide, hydrocarbons, and carbon monoxide, as well as brake specific fuel consumption, are presented as a function of air-fuel ratio, ignition timing, and percent of exhaust gas recirculation (EGR). Analysis of trends shows that EGR permits nitric oxides control with less fuel consumption penalty than extreme rich operation alone. Nitric oxide control is shown to be important at low power levels as well as high, while hydrocarbons are much more of a problem at the lowest power levels than at high engine outputs. An optimum engine size for the weight of a vehicle is indicated. Simulation of warm engine emission tests permits comparisons between several control approaches, suggesting entirely different calibrations are indicated for different emission performance goals.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Influence of Fuel Volatility on Emissions and Combustion in a Direct Injection Spark Ignition Engine

982701

View Details

TECHNICAL PAPER

The Effects of a Radio Frequency Ignition System on the Efficiency and the Exhaust Emissions of a Spark-Ignition Engine

2013-24-0053

View Details

TECHNICAL PAPER

Particle Formation and Emissions in an Optical Small Displacement SI Engine Dual Fueled with CNG DI and Gasoline PFI

2017-24-0092

View Details

X