Jump to content
Ivaylo Angelov

Engine fan control

Recommended Posts

Hello all and Happy New Year!

Please, I need an advice how to switch ON and OFF the engine fan based on two different temperatures. The fan is located behind two radiator cores, sealed inbetween. The front core is for the air-water intercooler system. The rear core is the engine  cooling radiator.  So, my aim is to switch ON the fan based on the ECT and also on the IC coolant temperature (there is a dedicated temp sensor connected and calibrated to AN volt 8 input).  

So far checked the engine fan AUX output as GP Output with logic cond 1 OR 2 (Cond 1 is ECT. Cond 2 is AN Volt8) and it seems it should work OK. What bothers me is that for GP Output there is no temperature hysteresis value but only a switch OFF timer delay value with max 12s only! That means if any of the temeratures falls slowly, the fan will be switched OFF (after 12s) but the actual coolant teperature drop could be just 2-3 C !?

Is there another way or logic for the engine fan control so I could achieve my aim but using OFF Hysteresis temperature  for both values?

Can I connect another! AUX Out to the same Fan relay pin as the "Engine Fan" Aux Output, so the Fan relay will receive ground signal from two independent Aux Outputs? What function to choose for the other AUX Out?

It is G4 Xtreme Red ecu.

Thank you!

Ivo

Share this post


Link to post
Share on other sites

Think this should work:

Setup 2 Virtual Aux

Virtual Aux 1

Logic = Cond(1 AND 2) OR 3

SW Cond 1 ECT | > 55

SW Cond 2  | Aux Virtual Value1 = ON  | 1

SW Cond 3 | ECT > | 75

Virtual Aux 2

Logic = Cond(1 AND 2) OR 3

SW Cond 1 IAT | > 35

SW Cond 2  | Aux Virtual Value1 = ON  | 2

SW Cond 3 | IAT > | 50

Then setup a AUX as a GP output 

Switch Logic Cond 1 OR 2

SW Cond 1 Aux Virtual Value1 = ON | 1

SW Cond 2 Aux Virtual Value1 = ON | 2

Share this post


Link to post
Share on other sites
26 minutes ago, Ivaylo Angelov said:

Thank you Clint! I'll try these settings.

It seems though, there is no support for G4 since New Year !??? I hope this wont be "forever"...

Support was closed till the 8th of Jan so are probably a little backlogged.

Share this post


Link to post
Share on other sites

OK,

Here are my new settings:

Virtual Aux 1 as a GP Output:

Virtual Aux 1.bmp

Virtual Aux 2 (for the intercooler coolant temperature) as a GP Out:

Virtual Aux 2.bmp

and the FAN control Aux Output set as a GP Out:

Fan control Aux as a GP Out.bmp

I understand your logic and it corresponds to the examples given in the Help menu. What bothers me is the Fan's GP Output setup. Why SW Cond 2 is again "Aux Virtual Value 1=ON" ? (Actually there is no other choise but "Aux Virtual Value 1=ON"  in the "SW Cond" menu!?) What, where from are the values 135 and 75 on the attached screenshot (Fan ctrl as a GP Out)? I didn't put them there.

What do you think?

Thanks!

Ivo

PS:  Aha! OK!  You!!!!  have adopted  "1" and "2" as Aux Virtual VALUES! for SW Cond 1 and SW Cond 2 ? Does that distinguish for sure betveen Virtual Aux 1 Out and Virt. Aux 2 Out  in the Fan Control GPOut setup?

SW Cond 1 Aux Virtual Value1 = ON | 1

SW Cond 2 Aux Virtual Value1 = ON | 2

;)

Share this post


Link to post
Share on other sites

On Aux 1 you have a mistake you need to reference the same Aux in the second condition.

135 and 75 were old valves carried over from the old settings.

135 should be set to 1 

75 should be set to 2 (the virtual aux port number)

 

 

Share this post


Link to post
Share on other sites
21 hours ago, ClintBHP said:

On Aux 1 you have a mistake you need to reference the same Aux in the second condition.

Hi Clint,

OK, but when I'm setting the SW Cond2 for Virtual Aux 1-GP Output, there is avaiable only "Aux Virtual value 2=ON (OFF)" from the pull-down menu? It seems I have to use for SW Cond 1 the Virt.Aux1 own on/off state. Only then the pull-down menu offers "Aux Virtual value 1=ON (OFF)".

...Or I'm totally out of space?:(

Please, would you check this again for me?

Thank you!

 

 

Share this post


Link to post
Share on other sites

Thank you vey much Clint!

No , it is not tested yet because I have to brake in the engine first. I could try it with variable resistors on the temp. sensor connectors.

It would be great if someone of the Link support could confirm these Fan control settings.

Thanks again. Will give a feedback when tested.

Ivo

 

Share this post


Link to post
Share on other sites

We are finally at a point where we are back to a full team and have cleared the back log. The benefit of the forum though is there are a lot of clued up people and dealers such as Clint there to help.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×