1997-02-24

Cycle-to-Cycle Transient Characteristics of Exhaust Gas Emissions from a Diesel Engine with Different Increasing and Decreasing Load Patterns 970750

Cycle-to-cycle changes in diesel exhaust gas emissions were investigated under two transient operation patterns: One, “an interval step decreasing and increasing load”, where the fuel amount is rapidly decreased from high to low loads, and after an interval, Δtint the fuel amount is abruptly returned to the initial level. The other is “a ramp increasing load”, where the fuel amount is increased gradually. Except just after the step increase in fuel amounts, the THC emissions were almost completely determined by the piston wall temperature and fuel amount. However, the THC concentrations immediately after the step increase in fuel amounts were much higher than the value of the corresponding steady state operation with the same piston wall temperature. This overshoot concentration, ΔTHC, was almost constant at different intervals, Δtint and it can be suppressed by ramp increased loading. The other emission components were mainly determined by the fuel amount while NOx increased slightly with increases in piston wall temperature.

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 Piston Design on Exhaust Gas Emissions of Gasoline Engines

952309

View Details

TECHNICAL PAPER

Optical Study of Swirl during Combustion in a CI Engine with Different Injection Pressures and Swirl Ratios Compared with Calculations

2012-01-0682

View Details

TECHNICAL PAPER

Piston and Ring Variables Affect Exhaust Hydrocarbon Emissions

680109

View Details

X