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PWM control engine fan


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Hey mate, I was just about to post this exact same topic.

You can indeed run the fan via PWM and with a solid state relay. 

The hurdle that I am not sure about is if the PWM ramps on at a reasonable pace or just comes on hard. I really want to ramp it on slowly over 3 seconds or so. I hope Link can sort this out. Would be perfect for fuel pumps too.


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It will activate to the duty cycle request the moment the conditions are met.

However it is a 3D control table so you could set one of the axis to be timer and ramp in the duty cycle over time.


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Absolutely perfect Simon. Thanks so much.

I was going to do an axis on battery voltage, and have it pull out duty as the battery voltage drooped.

But your way is much better.




Edited by JonoP
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