Is there anyone who had done project on getting the RPM reading from the Diesel Engine? Can anyone help me with this? Thank you in advance.
jeromesack:
Is there anyone who had done project on getting the RPM reading from the Diesel Engine? Can anyone help me with this? Thank you in advance.
There was a recent thread on the forum from a guy with a small Kubota tractor. He put a piece of reflective tape on the crank pulley and used an IR LED/sensor to detect the reflection. Wrote it worked.
Paul
Maybe detect and count pulses to a fuel injector?
If it is a modern diesel engine it may have a variable number of injections per power stroke depending on load.
My Jetta TDI has that, but if the OP needs a tach, he doesn't have electronic injection, or would have that already.
Paul
Well, we don't know the purpose for making one, and the original one could be out of sight when needed....
Hi,
Some crude diesel tachos were circuits that monitored the 3phase ripple on the alternator output.
The pickup point was at the output terminal of the alternator to ensure a good as possible a ripple signal.
But we need to know what technology level the Op's diesel engine is at to give a response.
Tom... 
JCA79B:
Maybe detect and count pulses to a fuel injector?
Yes that is my plan. How to connect it to the Arduino is the next problem. Is there any circuit that we need to build? I hope it's connected to the analog ports.
jeromesack:
Yes that is my plan. How to connect it to the Arduino is the next problem. Is there any circuit that we need to build? I hope it's connected to the analog ports.
Probably not a good idea to go poking around in injector logic given your level of knowledge.
A simple magnet and hall effect sensor will get you going without any invasive attempts into a rather complex piece of equipment.
You won't be connecting to any analog input, it is just a digital pulse, but you will need to look at interrupts and how to draw up your code. No idea why you would hope it is connected to analog.
These are available on Ebay ( 5 for $4.00 odd I believe).
Thank you. I will look into this solution.
Paul_KD7HB:
There was a recent thread on the forum from a guy with a small Kubota tractor. He put a piece of reflective tape on the crank pulley and used an IR LED/sensor to detect the reflection. Wrote it worked.Paul
I will try this method as well. Thank you