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Old 06-18-2011, 07:42 PM   #1
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Default Open Loop Idle Control

Would you choose IAT VS CLT for open loop idle or just CLT vs CLT? My ECU only control a 2 wire PWM in open loop (for now anyhow until new progress is made with the software).
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Old 06-21-2011, 12:21 AM   #2
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You'll want RPM v. CLT. Tweaking the timing map also goes a long way toward stabilizing idle and drop throttle transitions.

I highly doubt you'll see closed loop in a software update.
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Old 06-21-2011, 01:44 AM   #3
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I can keep my hopes up. Maybe they will make is available with one of the add on modules.

How would you scale the rpm? Ho many rpm cells and from what rpm to what rpm.
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Old 06-21-2011, 01:12 PM   #4
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The I/O 12 box does offer closed loop idle control. Spendy if you're just wanting that feature though. We have one installed on a 1.6 with a Sprint 500. Works well. If you're at all interested in one, let me know. I'll work with you on pricing.

Stack all the rpm points around the target idle speed. If 30% duty will hold the target idle, set it there and then taper the lower rpm points to a higher duty and the higher rpm points to a low duty. Use the coolant axis to create a cold engine idle up scheme. Higher duty at cold temps, lower duty when warm.

Do the same with the timing. When I setup timing I'll find the optimum idle timing and then back it down 2-3 degrees in the target idle rpm range. At lower rpm I'll setup the timing 2-3 degrees higher than the target idle rpm. This way when the rpm tries to fall the timing ramps up and helps steady the idle speed. You can do the same thing with coolant temp compensation.
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