closed loop cooling fan PWM control - feature request

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closed loop cooling fan PWM control - feature request

Postby ca434sbc4 » Sat Nov 18, 2017 4:40 pm

I'm running a cooling fan out of a Ford Crown Vic. The later designs used a PWM power controller (DC in, PWM +12 out, control input PWM 0 - 100%) to control the fan speed.

Can a closed loop PWM be added to the fan control based on the CLT sensor and a logic input to run at a higher speed ( possibly an adder the the PWM value) when the A/C is turned on?
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Re: closed loop cooling fan PWM control - feature request

Postby arran » Sun Nov 19, 2017 2:09 pm

Have you checked out Generic PWM under Advance Engine menu?
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Re: closed loop cooling fan PWM control - feature request

Postby ca434sbc4 » Sun Nov 19, 2017 10:34 pm

I did look at it, I may be missing how the clt sensor feedback is converted from temp (*F) into the load axis scaling from 0-100?

The manuals are a bit light on this. An example would go a long way to understanding the setup process.
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Re: closed loop cooling fan PWM control - feature request

Postby arran » Mon Nov 20, 2017 2:52 am

Something like this maybe,

coolant pwmJPG.JPG
coolant pwmJPG.JPG (119.09 KiB) Viewed 182 times
RX7 Series 2 13B Turbo. Megasquirt 3 with 3X Expander and V3 CPU. Firmware 1.4.1
Knock module, twin EGT, real time clock, WBO2, full sequential fuel and spark
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Re: closed loop cooling fan PWM control - feature request

Postby ca434sbc4 » Mon Nov 20, 2017 7:22 pm

pwmb.png
pwmb.png (49.28 KiB) Viewed 144 times
When I try to duplicate - in offline mode, the load axis scaling is still not setting up to the clt sensor range nor label is the load axis label updating to coolant.

So I'm still missing a step.
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Re: closed loop cooling fan PWM control - feature request

Postby arran » Tue Nov 21, 2017 2:36 am

Dude hit the three dots button top right hand side and the table will be shown
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Re: closed loop cooling fan PWM control - feature request

Postby elaw » Tue Nov 21, 2017 6:45 am

And if you hit the button with the three dots at the upper left of the graph, there are options there for scaling the axes.

The labels do not update... they always say "load" for whatever reason. But the PWM will use the parameter you select from the dropdown in spite of how the graph and table are labeled.
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Re: closed loop cooling fan PWM control - feature request

Postby ca434sbc4 » Fri Nov 24, 2017 6:54 pm

That makes sense. Thanks.

The one item missing is the ability to goto a high PWM value is the A/C pressure switch goes -> high pressure cutout >> which requires additional air flow to correct.
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