Post by thread:[PICLIST] [OT] Any ideas on a car security system?

Lee: everything you said sounded reasonable, except: >>If the mixture in the cylinders is lean enough, you can get >>hot spots and knocking -- which should trigger the knock >>sensor and cause an engine shutdown. I don't think the knock sensor causes the engine to shut down - it is just one of the feedbacks the engine control computer uses. Typically the spark advance would be reduced in response to knocking. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

All, I didn't see the original post, but here is my two cents worth. The knock sensor will not shut down the engine. At least in my experience, I have never seen it happen. The knock sensor, when activated by a knock, will signal the computer to retard the ignition timing until either the knocking stops, or the ignition timing is retarded as far as it can be, within the limits programmed into the computer. But the engine should keep running. Now, of course, the knocking, and the resulting adjustment, may cause some other parameter to get so far off it's nominal value, that possibly the engine might shut down. I don't know here. It just depends on how the computer is programmed to handle parametric extremes. Regards, Jim On Mon, 29 January 2001, Mike Mansheim wrote: {Quote hidden}> > Lee: > everything you said sounded reasonable, except: > > >>If the mixture in the cylinders is lean enough, you can get > >>hot spots and knocking -- which should trigger the knock > >>sensor and cause an engine shutdown. > > I don't think the knock sensor causes the engine to shut down - > it is just one of the feedbacks the engine control computer > uses. Typically the spark advance would be reduced in > response to knocking. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. spam_OUTjimTakeThisOuTjpes.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.