Electronics > Projects, Designs, and Technical Stuff

Generator Auto Start - When to Stop Cranking

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frostheave:
Hi All,

I would like to build an auto start circuit for my home backup generator.
My question is, what is the best output to sense, to decide when to stop cranking the starter?
Should I monitor the 120 Vac output?  Should I use some type of tachometer?  Something else?
Is there an industry standard that should be followed?

Thanks for your help.

Psi:
Maybe crank current would be much lower once the engine is turning itself over?

Bratster:
Tachometer /RPM would be the best measure in my opinion.

Sent from my Fi Moto x4 using Tapatalk

tkamiya:
I would check oil pressure.  If it's not building up, you better shutdown the engine.  (assuming this is 4 stroke)  Otherwise, I'd use hole-sensor or something and measure the crankshaft movement.

Also, if it doesn't start after X number of attempt, I'd stop. 

Psi:
I wonder if you could pickup something from the knock/detonation sensor. Assuming this engine has one.

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