BMW get their anti-det working
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Senior Member
Joined: Mar 2001
Posts: 348
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From: Brisvegas, Aust
BMW get their anti-det working
Remember the posts about research into Ion-sensing ignition?
Well BMW got it going:
Taken from the press kit for the forthcoming M5.
Apologies if this is in the wrong forum.
Well BMW got it going:
Highlight in engine management: ionic current technology.
The ionic current technology featured by the engine management unit is a technological highlight which serves to detect engine knock, misfiring and combustion misses. Utilizing the spark plug in each cylinder, this system helps to pinpoint engine knock, to check for correct ignition and to detect any ignition misses. Thus the spark plug has a dual function – as an actuator for the ignition and as a sensor for monitoring the combustion process. The ionic current measuring is done directly during the combustion process. The so-called ionic current satellite receives signals from the five spark plugs of each cylinder bank. Dependent on the load, it amplifies these signals and transmits them to the engine management system for analysis, which, for example, perfectly adjusts the ignition point of each cylinder via knock control to the combustion process. All this results in benefits for the driver of the new M5 – lower fuel consumption, higher torque and enhanced performance.
The ionic current technology featured by the engine management unit is a technological highlight which serves to detect engine knock, misfiring and combustion misses. Utilizing the spark plug in each cylinder, this system helps to pinpoint engine knock, to check for correct ignition and to detect any ignition misses. Thus the spark plug has a dual function – as an actuator for the ignition and as a sensor for monitoring the combustion process. The ionic current measuring is done directly during the combustion process. The so-called ionic current satellite receives signals from the five spark plugs of each cylinder bank. Dependent on the load, it amplifies these signals and transmits them to the engine management system for analysis, which, for example, perfectly adjusts the ignition point of each cylinder via knock control to the combustion process. All this results in benefits for the driver of the new M5 – lower fuel consumption, higher torque and enhanced performance.
Apologies if this is in the wrong forum.
Thread Starter
Senior Member
Joined: Mar 2001
Posts: 348
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From: Brisvegas, Aust
Instead of waiting to hear the pistons rattle, it figures out how close it is to detonation by how much current the spark plugs draw. Means they can run right on the limit the whole time completely safely.
You can create a ion sensing ignition using a 16-bit microcontroller, texas instruments MSP430.
Want to DIY, see here: http://www.hut.fi/~vvartiov/ion/DIY-Ion-Sensing-2.pdf
Want to DIY, see here: http://www.hut.fi/~vvartiov/ion/DIY-Ion-Sensing-2.pdf
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Still on 1st engine
Joined: Jun 2003
Posts: 1,176
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From: SoCal
Re: Saab
http://www.mecel.se/technologies/ionsense/default.htm
I belive Delphi has been doing this with their systems for a while now.
Knowing BMW's electrics, I wonder if it actually works.
That reminds me, wern't they promising to use an electric valvtrain a few years back?
http://www.mecel.se/technologies/ionsense/default.htm
I belive Delphi has been doing this with their systems for a while now.
Knowing BMW's electrics, I wonder if it actually works.
That reminds me, wern't they promising to use an electric valvtrain a few years back?
Senior Member
Joined: Oct 2002
Posts: 307
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From: San Ramon CA 94583
This is fun stuff. I could potentially machete the ball of sensor weeds. No need for MAP, or O2. Knowing displacement, crank position, fuel dose, combined with sampling current in the chamber, defines the last ignition performance. A quick ECU would adjust the very next ignition.
Fuel timing could be adjusted for nearby injectors. The upstream secondaries on the 13B would be a pain, and I'd never tune so closely as needing the next injector pulse to be perfect, however.
Fuel timing could be adjusted for nearby injectors. The upstream secondaries on the 13B would be a pain, and I'd never tune so closely as needing the next injector pulse to be perfect, however.
Rotary Freak
Joined: Aug 2001
Posts: 1,734
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From: maryland
Yeah Mercedes has used it on the exclusively on their v12's (M137/M275) since 2000. It fires the plug normally at something like 120kV then a few milliseconds later it fires the plug again but at only like 10kV and interperets the "burn time" to tell if there is complete combustion.
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