Quote:
Originally Posted by H-Man
I wonder if a microcotroller could be used to control the electronic throttle body with a few sensor inputs so that it could switch over and have the right throttle opening. It wouldn't need to be super fast, all it would need to do is guess where to put the throttle when it switches over to avoid any jump in power.
Searching, it looks like the arduinos are fast enough to handle throttle body duty. You might need a good 100 datapoints to make a good map though, maybe some way to warn the ECU when it is going to go 13:1 also so that it doesn't go lean.
You may be able to rig up an electromechanical setup that shuts the throttle body somewhat when the engine switches to 13:1 and set up the throttle linkage to take it WOT at part throttle when in 6:1
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I think it could be tricky. Just getting a throttle to follow the pedal position is a pretty complex exercise in control. You then get to add in another parameter in the form of the VVT position. The pedal position would be treated as a torque demand (same as all DBW) and the best combination of throttle position and VVT position figured out to provide it.
I did find (some time ago) a guy who had built his own DBW controller (for use in a Countach) and who was going to post up a how-to-do-it on his page (he hadn't done so last time I saw it).
The DBW do use two or more pedal position sensors and two microcontroller circuits to provide error checking. Might consider that if designing one from scratch.