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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Appendix D: Select Acronyms ."
Assessment of Fuel Economy Technologies for Light-Duty Vehicles . Washington, DC: The National Academies Press,
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The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.