by Beshires1 » Sat Dec 01, 2007 7:15 am
weggl, Thought I'd help Gary out a little. Most ICE are only about 25% efficient in fuel consumption. The OBC tries to run the air fuel mixture within its set perimeters, These are somewhere between rich and only slightly lean, but mostly rich.The OBC , reads the signals from the O2 and and is constantly adjusting the air fuel mixture. When boosting the hydrogen burns all the fuel cleanly, making the O2 sensor show a lean condition. This makes the OBC compensate by adding more fuel to richen up the mixture , trying to get it back into its parimeter. This would cause extra fuel consumption. The 02 Extender or (Effie) circuit changes the set perimeter range of the 02 so that the Hydrogen when burned shows to be in perimeter or a rich condition existing, and makes the OBC adjust the mixture leaner to compensate. Resulting in less fuel being injected and less fuel fuel being consumed. AS for the second sensor, before the CC these are usually devices that spark when comanded by the OBC to burn the excess fuel in the exaust. Some vehicles, now have three the O2, the sparker, the one in front of the converter, and another 02 behind the CC that checks out the other two's handy work. Hope this helps.