Join Date: May 2004
location: Morganville, NJ
Thanked 22 Times in 18 Posts
Throttle plate position is going to be hard to determine, as it's not just following movements dictated by your foot.
The PCM is controlling it, and is effected by things like the IMA, VSA, etc. The huge spikes could just be noise.
I'd really like to see a real scope pattern of requested throttle and the actual output from the throttle control module.
You can also be seeing noise introduced by things like the alternator, and the TAC motor itself. It is a quite high current motor, and I'm not familiar with the software you're using.
I'm not sure, exactly, what the IMA's effects if any on the electronics are. I'd have to ask around.
Don't forget, the IMA motor is always turning, since it's the flywheel, but may not have the high voltage going to it. It is also a generator to charge the high voltage battery, should it require it, usually only during decel while braking. It also has to generate power, albeit small, to charge the car's 12v battery as there is a DC to DC converter in the system, since the car doesn't use a conventional alternator.
I've been reading how the IMA system works. The IMA control system can modify nearly everything you're seeing. It modifies TAC, VCM (it can keep valves closed during certain times as it sees fit)
You may be feeling the "hiccup" or buck as the VCM operating, as it will try and operate in 3 cylinder mode as much as possible, any throttle input it sees as a demand for acceleration it'll switch to 6 cylinder mode and back again.
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