Ivaylo Angelov Posted January 7, 2018 Report Share Posted January 7, 2018 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 Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 9, 2018 Author Report Share Posted January 9, 2018 Knock, knock...? Is there anyone from the famous Link tech support? Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 9, 2018 Report Share Posted January 9, 2018 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 Ivaylo Angelov 1 Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 10, 2018 Author Report Share Posted January 10, 2018 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"... Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 10, 2018 Report Share Posted January 10, 2018 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. Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 10, 2018 Author Report Share Posted January 10, 2018 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 Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 10, 2018 Report Share Posted January 10, 2018 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) Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 11, 2018 Author Report Share Posted January 11, 2018 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! Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 11, 2018 Report Share Posted January 11, 2018 Upload your map and Ill take a look. Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 11, 2018 Author Report Share Posted January 11, 2018 32 minutes ago, ClintBHP said: Upload your map and Ill take a look. Last 31.08.17.pcl Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 11, 2018 Report Share Posted January 11, 2018 That looks fine Ivaylo, have you managed to test it ? Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 12, 2018 Author Report Share Posted January 12, 2018 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 Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 13, 2018 Report Share Posted January 13, 2018 Fingers crossed my friend Ivaylo Angelov 1 Quote Link to comment Share on other sites More sharing options...
Simon Posted January 15, 2018 Report Share Posted January 15, 2018 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. Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted January 15, 2018 Author Report Share Posted January 15, 2018 OK, Thanks! Quote Link to comment Share on other sites More sharing options...
400s Posted October 19, 2018 Report Share Posted October 19, 2018 Ivaylo, Did it function as expected? Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted October 20, 2018 Author Report Share Posted October 20, 2018 Hi, Unfortunately it is not fully tested yet. The car is in a body preparation period, so no more engine starts lately. I did test these fan settings once though. The fan turned on as expected on the set engine coolant temperature. I had not enuogh time to play with the IC water temperature settings to trigger the fan. Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted September 9, 2021 Author Report Share Posted September 9, 2021 Hello all! The work on the car was postponed for a long time. Just recently the engine was started again and... here is the thread revival. I need help thoughThe problem I'm facing is with the idle rpm control. My radiator fan is switching ON and OFF as per the control logic described above. So far so good but when it turns ON the idle rpms sink down remarkably due to the initial generator el. load. Tried to add ms fuel and % PWM idle valve corrections when the fan kicks in but without success. Then I realized that these idle rpm corrections/compensations might work only when the output is configured as "Engine Fan" . This is not the case with my current Fan control output that is configured as "GP Output" so I could implement the logic. If that's correct, how could I add the same idle control corrections when a "GP" Output controls the engine fan? Thanks! Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2021 Report Share Posted September 10, 2021 Can you attach a log and the tune. Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted September 10, 2021 Author Report Share Posted September 10, 2021 Hello Adam, Unfortunately I forgot to take a log from the moment of idle rpms sink. I'll do that when I get back to the car. Here is my pcl file. The fan is wired to AUX 7. Again, what I can read in the Help Manual, G4 ECU Tuning Functions>Fuel>Idle Load Trims is related only about when "Engine Fan" output is activated. The same is with the Idle speed control settings and the "Engine Fan Step". Thank you! 050921.pcl Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2021 Report Share Posted September 10, 2021 G4 is a bit limited in this respect. There are no user definable "idle steps". The best work around that I see is to loop a wire from your Aux 5 fan output to a spare DI. Set the DI up as power steer switch. Then you can use the power steer idle step and power steer idle load fuel trim for the fan. Ivaylo Angelov 1 Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted September 11, 2021 Author Report Share Posted September 11, 2021 Thank you Adam! I also thought it should be something using a DI. BTW you meant Aux 7, not Aux 5. Right ? Great support as always from the Link team. No matter how old is your ECU. That's just amazing! Thanks again. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 11, 2021 Report Share Posted September 11, 2021 3 hours ago, Ivaylo Angelov said: BTW you meant Aux 7, not Aux 5. Right ? Whichever one is controlling the fan, it is not obvious from the tune. Quote Link to comment Share on other sites More sharing options...
Ivaylo Angelov Posted September 12, 2021 Author Report Share Posted September 12, 2021 On 9/11/2021 at 1:54 AM, Adamw said: G4 is a bit limited in this respect. There are no user definable "idle steps". The best work around that I see is to loop a wire from your Aux 5 fan output to a spare DI. Set the DI up as power steer switch. Then you can use the power steer idle step and power steer idle load fuel trim for the fan. Strange, there is no Idle Load Fuel trim for the Power Steer. There is just Air ConTrim, Engine Fan trim and Drive trim. Anyway, I'll configure the DI as an Air Con Request Quote Link to comment Share on other sites More sharing options...
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