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Guide to Common Green Acronymns

Deciphering the new vocabulary of the green car movement can sometimes be a real head scratcher. To alleviate as much confusion as possible, we would like to present our readers with a list of common acronyms and what they mean, with plenty of links for more information. If you have some TLAs (that's three-letter acronyms) that you'd like us to add to our glossary, just let us know in the comments.

Honda K20Z3 featuring i-VTEC - click above image to watch the video

Click on the image for a gallery of high-res images of the 2007 Jeep Patriot.

Just a decade ago, engine management was a relatively simple affair. Spark advance and fuel injection quantities were the key parameters, and the determination of both was a relatively simple matter of determining engine speed and load and using those values to index a lookup table. Nowadays, however, technology to improve power, drivability, and fuel consumption - such as variable valve timing and lift, intake tuning, and variable displacement - have greatly complicated the task of calibrating

Amidst the "19 new engines" announcement from General Motors Thursday was a brand-new engine of particular significance for the power-hungry (and aren't we all?): a 3.6 liter all-aluminum V6 with direct injection and variable valve timing. The new V6 is promised for the 2008 model year, with a launch vehicle "to be announced."