Now that many cars have automatic stop/start there is a requirement for bidirectional crank position sensors. (So that the PCM can track crank position if the crank rocks-back and still fire on the first TDC).
The sensors are (often) a magnetic track on the outside of a wheel. The ones I have here a central boss with a 30mm bore, but this is pressed into a sensor ring with a 70mm bore, which would be adequate for quite large spindles. A typical encoder ring is Ford part number 7M5Q-6B319-BA which costs £50 inclusive of VAT. The sensor is DS7Q-9E731-BA and costs £23 The encoder protocol is a bit unusual. Index is indicated by a missing pulse, and direction is indicated by pulse length. So some changes would be needed to the encoder component to support this class of device. On the plus side you get index and direction for only one IO line. I don't actually know what sensor is the Ford package however I have found a direction-detecting sensor for ferrous targets such as gear wheels here: http://www.allegromicro.com/~/media/Files/Datasheets/ATS693-Datasheet.ashx?la=en It isn't clear if that one can use missing-tooth index, it looks like it might reject it as a vibration artefact. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
