OEM original equipment manufacturer

OHV overhead valve

PCCI premixed charge compression ignition

PDA partial discrete approximation

PFI port fuel injection

PGM platinum group metal

PHEV plug-in hybrid electric vehicle

PM particulate matter

R&D research and development

RPE retail price equivalent

RWD rear-wheel drive

SAE Society of Automotive Engineers

SCR selective catalytic reduction

SGDI stoichiometric gasoline direct injection

SI spark ignition

SOC state of charge

SOHC single overhead cam

SUV sport utility vehicle

UDDS urban dynamometer driving schedule

ULEV ultralow-emissions vehicle

V6 six cylinder V engine

VEL valve event and lift

VEM valve-event modulation

VGT variable geometry turbochargers

VVL variable valve lift

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