Browse Publications Technical Papers 2006-01-3402
2006-10-16

Modeling the Evaporative Emissions of Oil-Fuel Mixtures 2006-01-3402

Motor vehicle hydrocarbon evaporative emissions are a crucial part of emissions regulations, and increasingly-stringent regulations stipulate essentially zero fuel-based hydrocarbon evaporative emissions. In port fuel injected engines, there is the potential for accumulation of PCV effluent in the intake system under certain vehicle operating conditions. The majority of this effluent is oil, but a percentage has been shown to be fuel. The percentage of fuel in this oil-fuel mixture in the intake is at a minimum equivalent to the fuel dilution level of the crankcase oil, and at times can be higher due to other sources of fuel, and fuel vapor, in the intake. This accumulation of liquid oil-fuel mixture can be a contributor of hydrocarbon evaporative emissions migrating out of the air induction system when subjected to transient temperatures while the engine is off. This paper describes a transient, multi-domain physical model in Modelica® to describe the evaporative emissions of fuel-oil mixtures during a simulated diurnal Sealed Housing Evaporative Determination (SHED) test. Following a description of the SHED test and the model, analytic results are shown and validated against the experimental data over a wide range of operating conditions. An analytic design of experiments (DOE) was conducted and compared with available experimental results for a range of liquid compositions and amounts, surface areas, and transient temperature profiles. The model proved to be very effective at predicting both the magnitude and trend-wise behavior of the evaporative emissions of fuel-oil mixtures over the range of conditions simulated.

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

Development of a Model for the Simulation of a Reed Valve Based Secondary Air Injection System for SI Engines

2005-01-0224

View Details

TECHNICAL PAPER

CFD Modeling of Processes Upstream of the Catalyst for Urea SCR NOx Reduction Systems in Heavy-Duty Diesel Applications

2011-01-1322

View Details

TECHNICAL PAPER

Optimized PFI+DI Operation For Minimizing DI Gasoline Engine Particulates

2018-01-1415

View Details

X