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Ion current misfire detection

Ion current misfire detection

Ion current misfire detection

(OP)
Hello to all.

I have recently become intrigued by this new technology, and would to gather some more information. Don't worry Greg, I have already made google my friend on this matter, and have found a few interesting sites. The questions/suggestions I have/need so far are:

1. A recommendation of the best SAE papers on this subject. A search on the SAE site turns up dozens, I would like help in selected the "top five", so if any have read or can recommend papers on this subject

2. the only vehicle I am aware of so far that uses this technology is 2000+ Isuzu rodeos. Are there any others that use this? I'm hoping to find relatively affordable pieces with good documentation to make a retrofit to a test stand as easy as possible.

3. Has anybody here have any hands-experience with this technology, and can alert me to any problems it has (such as with accuracy, etc). I am aware that you definitely need to be prepared to deal with cycle to cycle variation. As a background, my company might look to this technology as a more affordable alternative to direct in-cylinder pressure measurement.

thanks a lot

RE: Ion current misfire detection

I believe SAAB pioneered the technology with their vehicles a couple of years ago.  I do know that it is use in advanced engine development labs and have seen it in action.  From what I've been told, its VERY accurate, but only as much as the rest of the ignition system.  The ones I've seen are coil-over coils to eliminate the secondary cabling issue.

Franz

RE: Ion current misfire detection

Mecel in Sweden did most of the development work on Ion Sense. They were bought by Delco Electronics several years ago. I'd say it would be difficult to get the Rodeo Ion Sense system working on another engine because of windowing issues. I'm pretty sure each cylinder on each engine family needs it's own ion current characterization. It may be possible to get simple misfire detection, but knock, cylinder pressure, and air/fuel ratio detection need exhaustive characterization. closed loop adaption of baseline ionic current is also  necessary because Ionization current can vary temendously
with fuel composition (additives) Ion Sense is a really neat technology but except for a few exceptions like saab and isuzu, everyone else figures it's cheaper to use a knock sensor for knock detection and crank
velocity to detect misfire.

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