Up to 80 percent of the total hydrocarbons emitted during the EPA Federal emissions test are produced in the first five minutes of this procedure. It has been theorized that this is in part due to wall wetting of the intake port and cylinder.This study measures the behavior of the fuel film thickness in the intake port during cold starting, steady state and transient operation. Three injector spray patterns with varying droplet sizes were utilized for the tests. The fuel film thickness in the intake port of a Ford 1.9L engine was measured using optical sensors. It was found that the spray pattern and droplet size affected the port wall wetting characteristics.
Fuel Film Dynamics in the Intake Port of a Fuel Injected Engine
Sae Technical Papers
International Congress & Exposition ; 1994
01.03.1994
Aufsatz (Konferenz)
Englisch
Fuel film dynamics in the intake port of a fuel injected engine
Kraftfahrwesen | 1994
|An Optical Sensor for Measuring Fuel Film Dynamics of a Port-Injected Engine
SAE Technical Papers | 1997
|An optical sensor for measuring fuel film dynamics of a port-injected engine
Kraftfahrwesen | 1997
|Cold Engine Transient Fuel Control Experiments in a Port Fuel Injected CFR Engine
Online Contents | 2008
|Mixture Preparation Mechanisms in a Port Fuel Injected Engine
SAE Technical Papers | 2005
|