FAN M54 PWM how to set up bluepill

[cieelak]

HI there !

I got little trouble controlling my PWM fan, Fan will start at 10% Duty with the ignition on, cold engine, and during warm up, fan speed does not change, even if coolant reach 110 deg. Celsius. Hardware is defiantly good, as if i change value to 50% in line 771 and 772 in "SerialtoBMWcan" fan will speed up to 50%duty and stay there no mater what coolant temp. Is there anything else in code that I go to change ? What about line from 318 to 338 ? Coding is new to me so thanks for any advices....

Best Regards.

[cieelak]

Hi, I spare some time and have a play with BMW fan and external PWM controller to check how is the fan behaving, and interesting result come up... At 10% duty fan spins at full speed, and 90% duty fan spins slowest speed, 0-10% and 90-100% Fan doesn't spin. At least that explain why the fan is always spinning with ignition ON ... however, I still don't know how to fix the code, please Pazi88 I need your assistance here :)

PS, Is my thinking correct, there is no implementation in code to run Fan speed depending on coolant temp, we can run fan and change FAN speed using cruise button only ?

[amasood1193]

not m54 related, but i am running Pazi's stm32 mega alternative with a GM PWM fan controller, it works perfectly for me. not had any issues with it. assuming the code is the same, should work the same on the bluepill, what controller do you have?

[cieelak]

Right, so I think I got this figure out. I can control fan speed coresponding to coolant temp. In TunerStudio i got to select:

fan setling has to be "ON",
and "PWM" selested,
fan output pin: "Board Detaful"
Fan Curve adjusted,

In my case 90% is slowes speed and 10% is MAX FAN speed. but I still unable to stop the fan no mater what, so I think solution is bluepill firmware is to change PWM min duty to 0% or 5% and that should stop the fan, I will raport once I got this tested ...

[h25r]

Right, so I think I got this figure out. I can control fan speed coresponding to coolant temp. In TunerStudio i got to select:

fan setling has to be "ON",
and "PWM" selested,
fan output pin: "Board Detaful"
Fan Curve adjusted,

In my case 90% is slowes speed and 10% is MAX FAN speed. but I still unable to stop the fan no mater what, so I think solution is bluepill firmware is to change PWM min duty to 0% or 5% and that should stop the fan, I will raport once I got this tested ...

same happens to me, the fan is always on
did you solved the issue?