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Dive into the research topics where James David Pakko is active.

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Featured researches published by James David Pakko.


Volume 1: Large Bore Engines; Fuels; Advanced Combustion; Emissions Control Systems | 2014

The Effect of Ash Accumulation on Gasoline Particulate Filters: A Comparison Between Laboratory and Field Aged Samples

James Jorgensen; Timothy Murray; Alexander Sappok; Victor W. Wong; Christoph Börensen; Christine Kay Lambert; James David Pakko; James Robert Warner

Stringent regulations worldwide will limit the level of particulate matter (PM) and particle number (PN) emitted from gasoline engines. Gasoline particulate filters (GPFs) present one strategy for meeting PM and PN limits over the full operating range of the engine. Over time these filters accumulate incombustible ash, increasing system pressure drop and adversely effecting engine performance. The effect of aging as a result of ash accumulation is examined over the full lifetime of gasoline particulate filters, using a novel accelerated aging system. This system utilizes a gasoline combustion chamber into which lubricating oil is injected simulating combustion in the cylinder — the primary source of ash. This report details the construction and validation of this system.Copyright


Emission Control Science and Technology | 2017

Gasoline Particle Filter Development

Christine Kay Lambert; Timothy Chanko; Douglas Allen Dobson; Xin Liu; James David Pakko

Gasoline particle filter (GPF) development includes optimization of multiple, competing targets: low backpressure, high clean filtration, acceptable strength, high oxygen storage capacity, small size, and low cost. A three-way catalyst + GPF system needs to meet targets for hydrocarbons, carbon monoxide, and nitrogen oxides in addition to particle mass and/or particle number. GPFs behave differently than diesel particle filters (DPFs) in terms of regeneration and ash loading behavior due to vastly different operating conditions. In a relatively clean exhaust condition on GDI relative to diesel, an empty GPF can have filtration efficiencies on the order of 60%. This was improved to 80–90% with a small amount of soot and/or ash on the filter walls, or higher catalyst washcoat loading. In the course of this work, models were developed to predict backpressure, filtration, and chemical performance.


SAE transactions | 1994

Measurements of Total and Speciated Hydrocarbon Removal from Engine Exhaust Using Activated Carbon

James David Pakko; Andrew A. Adamczyk; Walter O. Siegl; Robert J. Pawlowicz

A hydrocarbon trapping system for cold start emissions was constructed and tested using two types of carbonaceous absorbants provided by Corning, Inc. One was made by combining activated carbon with an organic binder and extruding it into a honeycomb, and the other by depositing a carbon coating on a ceramic monolith. The tests were carried out on an engine in a dynamometer laboratory to characterize the performance of the carbon elements under transient cold start conditions. Performance was evaluated by continuously measuring exhaust gas hydrocarbon concentrations upstream and downstream of the trap, using conventional emission consoles. Speciation of samples collected before and after the traps revealed that high molecular weight hydrocarbons were trapped very efficiently, while low molecular weight species were not. The results obtained illustrate the effect that fuel selection has when determining the mass- and reactivity-based trapping efficiency of cold trap absorbants. 20 refs., 10 figs., 2 tabs.


Archive | 2011

Engine control method and system

Michael Daniel Shane; James David Pakko; Paul M. Laing


SAE transactions | 1991

Three-Dimensional Simulations of Automotive Catalytic Converter Internal Flow

Ming Chia Lai; J.-Y. Kim; C.-Y. Cheng; Peter Li; Granger K. Chui; James David Pakko


Archive | 1993

Automotive engine with exhaust hydrocarbon adsorber having oxygen sensor regeneration control

Andrew A. Adamczyk; Ronald G. Hurley; James David Pakko; Lisa A. Hansen


Archive | 1998

Catalytic converter decontamination method

Andrew A. Adamczyk; Arthur E Kolasa; James David Pakko


Archive | 1996

Assembly and method for monitoring hydrocarbon concentration in exhaust gas

Andrew A. Adamczyk; James David Pakko; Jeffrey Scott Hepburn


Archive | 1993

Automotive engine exhaust aftertreatment system including hydrocarbon adsorber with sample processing oxygen sensor regeneration control

Andrew A. Adamczyk; Ronald G. Hurley; James David Pakko


Archive | 1993

Automotive engine exhaust aftertreatment system including hydrocarbon adsorber with internal engine purge flow control

Andrew A. Adamczyk; Ronald G. Hurley; James David Pakko; Lisa A. Hansen; Peter Mitchell Lyon

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