1979-02-01

Measurement of Local Mixture Strength at Spark Gap of S. I. Engines 790483

In spark ignition engines, local fuel concentration of the mixture occupying the electrode spacing at the instant of spark discharge may be one of the important factors to dominate the combustion process and the cycle-by-cycle variation of combustion.
To make clear the above problems, a special sampling device has been developed. The sampling valve is equipped with the central electrode of the spark plug, which enables us to sample the mixture formed near the electrode spacing of the spark plug in the ordinary engine operation.
By applying this device, the mixture existing just before the occurrence of spark discharge can be taken repeatedly every cycle, and the cycle-by-cycle variation of mixture strength in the immediate vicinity of the electrode spacing was made clear. Further, it was found that the cycle-by-cycle variation of mixture strength formed in the electrode spacing at the instant of spark discharge increases by the engine operation with EGR.

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

Fiber Optic Sensor for Time-Resolved Measurements of Exhaust Gas Recirculation in Engines

2000-01-2865

View Details

TECHNICAL PAPER

Dynamic EGR Estimation for Production Engine Control

2001-01-0553

View Details

JOURNAL ARTICLE

EGR System Fouling Control

2008-01-0066

View Details

X