Quote:
Originally Posted by parsonsj
Yes, it would be awesome for such a standalone controller to also support an AC pressure sensor. All the fan controllers I've seen just turn on the fans to a set speed (usually 100%) with a 12V input signal when the AC is turned on.
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This functionality is built into OEM control logic (E40, E38, E67, etc. with PWM fan control. There are cal's based on following:
- ECT
- Oil temp
- Trans temp
- IAT
- AC pressure
Way logic works is a % output based on each of these inputs - and highest request wins. In other words, if ECT is requesting 30%, but AC pressure is requesting 42%, fans are driven @ 42%.
Stand-alone controller would need provisions for a scaled 0-5V input based on AC pressure with a cal relating that pressure to a requested output. And same logic where highest request wins.
Dave