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autosparky
Guest
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 Posted: Fri Jan 20, 2006 10:15 am Post subject: missfire detection by crank sensor |
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| think this might work? has anyone detected missfires by the time diferences between firing events? or on a crank angle sensor? in theory a dead cylinder should rotate the flywheel slightly slower due to lack of power stroke and slower again on the next compression. |
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ricardo
Moderator
Joined: 07 May 2003
Posts: 98
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| Posted: Fri Jan 20, 2006 2:35 pm Post subject: |
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Yes in theory this is possible, this is how the PCM or ECU's OBD system detects misfire. The trick is how to process/analyse the signal captured by the scope.
Here is an interesting article you might find useful,
http://www.findarticles.com/p/articles/mi_qa3828/is_200005/ai_n8891565
Another method used to detect misfire is analysis of the oxygen or lambda sensor. A company that specialises in this is Thomson Automotive Labs in the US. This is their website,
www.acemisfire.com
Best regards,
Ric |
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anttdogg73
Guest
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| Posted: Fri Feb 24, 2006 4:21 am Post subject: crank angle sensor |
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| what is a crank angle sensor on a1.8l dohc acura integra engine its on a 96-01. |
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ricardo
Moderator
Joined: 07 May 2003
Posts: 98
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| Posted: Fri Feb 24, 2006 11:00 am Post subject: |
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Hi,
The crank angle sensor tells the ECU the position of the crankshaft so it can work out when to fire the plugs and injectors. Its usually either an inductive or hall effect sensor located on the flywheel or on a pulley at the other end of the crankshaft.
Best regards,
Ric |
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