Daewoo LaNOS Sport, 2001, Opel C20XE (2.0 16V), headworks (172HP), Wizard of NOS (70HP shoot now), Custom SMS alarm system, etc
More about Idle algorithm and VEMS:
I was looking for this but I couldn't found it...
Newer cars with air conditioning compressor has 2 speed fans (low speed when A/C on, and for up to some temperature point, when high speed fans is powered up). Also A/C has MAP sensor for monitoring pressure inside the A/C system...
Also, when A/C is turned on, idle rpm must rise for about 200rpm... And it must turn off A/C on higher engine loads and when rpm passes like 4000rpm so it wouldn't destroy A/C compressor...
Has VEMS ability to control this? So you must have 2 stage cooling fan outputs like first stage on 94 degres and second stage (fast speed) on 97 degres of CTS... Also first speed fans speed must be on when A/C is on and car is standing still...
The reason for turning of A/C above 4000rpm is the power also... But the main reason is saving compressor... It could destroy something if the pressure in the A/C system rises to much on high rpms...
So, you think that this could be inserted in VEMS? It's not a problem to me to make another piggyback with AVR to controll fans speeds and A/C (as I got one now on C51 because motronic is moronic), but the point is to have ECU that would replace standard ECU, that controlls almost anything on newer cars (well if the daewoo lanos 2001 make is reference ;D :D )...
Motronic is not the best reference... It's pretty old... ;D It doesn't controll fan LOL, but it does have A/C in switch, that rise idle rpm as you turn on the A/C... But it doesn't have rpm switch... ::) :'(
Well, I could help development team to extend this... ::) When I get to that point... Of course... :D
Piggybacks, engine monitors and VEMS:
My question was:
Does VEMS spits all the time all the information on RS232 or you have to ask for the information?
Is the information in binary form or ascii form?
The answer:
No, you have to ask for information...
This means that you cannot have 2 monitoring devices attached... >:(
One would be carputer or laptop when megatune application is called, and the other would be some sort of engine monitoring piggyback like BC, monitoring engine cosumtion, state, etc, and displaying it on small LCD...
Is there a workaround? AVR has 2 RS232 ports... Could you make to use other port (or SPI) for connection to piggyback? Piggyback would inform VEMS about VSS and Launch, and VEMS would sendback rpm, injection time, retarding, knocking, etc... So it would finally become the most powerfull ECU that has it all... :D
This way it would get like engine consumptions (average and current), average speed, acceleration time in real time, engine monitoring, etc... As mentioned in daughter board section... :LOL: