I am very interested in this project. I would love any assistance that you could provide me with! I am wanting bench test engine harness and in order to do that the engine needs to "run" most of the sensors I can turn off with my tuner, or fake with resistors and transformers. However the crank signal I need!Continuing on with the selectable teeth count idea... a little juggling of both of the 4017s' output lines made that easy to do by just adding a couple of 20-pin IDC headers.
One jumper per header allows selection of any number of gear teeth you could get by multiplying two numbers in the range of 1 through 10.
Currently, a jumper must be present somewhere on each header to prevent the reset input from floating, but a 10k pull-down resistor on the reset pin would alleviate that necessity.
I am interested in two types 58x (60-2) and a varried 24x used on GM GEN III and IV V8 engines. I believe them both to be square wave, 12 volt pull up type sensors.
The 24x maybe very hard to replicate the toothes are spaced unevenly, al though when vied on a scope they appear to be spaced equally I think 24 tooth wheel with know gap would work no problem.
What are you using for your source voltage? I have a PCM power supply converted to "LAB" power it puts out 12 volts VDC. Will that work? I can solder, but I don't think
I don't think I can do any programming, do the 4017 need to be programmed? How to I set the jumpers for about 600 rpm, and 24x trigger wheel? Were does the power supply get wired in were it says 14 vc? How do I wire up the sensor inputs. Low ref, 12 volts, and sensor signal., to the PCM? How much are all the parts required to build the circuit , under $50.00 CDN would be great! Thanks for your help. -Jamie
Here is the diagram from the other thread, if someone could help me work with it or design me another one that would be great!
http://forum.allaboutcircuits.com/attachment.php?attachmentid=13707&d=1258696436
Sensor description;
The Crankshaft Position Sensor (CKP) is mounted
in the right rear of the engine block behind the
starter. The CKP sensor works in conjunction with
a 24X reluctor wheel mounted on the rear of the
crankshaft. The CKP sensor has a battery power
supply, an earth, and a signal circuit.
As the crankshaft rotates, the reluctor wheel teeth
interrupt a magnetic field produced by a magnet
within the sensor. The sensor's internal circuitry
detects this and produces a signal which the PCM
reads. The PCM uses this signal to accurately
measure crankshaft position and engine speed.
The reluctor wheel is mounted on the rear of the
crankshaft. The 24X reluctor wheel use two
different width notches (12° and 3°) that are 15°
apart. This pulse width encoded pattern allows
cylinder position identification within 90 degrees of
crankshaft rotation. In some cases, cylinder
identification can be located in 45 degrees of
crankshaft rotation. This reluctor wheel also has
dual track notches that are out of phase. The dual
track design allows for quicker starts and accuracy
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