Quote:
Originally Posted by jamesm
i agree with most of that. my main point of contention would be throttling down when the system detects it has reached target. it would be best to just return early and let it loop over, no need for unnecessary motor control (one of the most computationally expensive operations in the system), and it will result in oscillation in all cases.
of course when the system is armed a simple scaling of throttle percentage to motor speed is less than ideal as well, as we're not concerned with motor speed, we're concerned with boost. it should read map, then compare to a boost target referenced from rpm and throttle position. this is a far more flexible design, imho.
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Your assuming that a static situation when you are in standby and just trying to maintain a minimum pressure. As the engine revs up and down the speed of the motor will need to rise and fall.
Maps are great idea but right now I'm just looking at a prototype. It's hard to make a map when you don't even know things like what sort of max boost you can get.
Also keep in mind that this system is limited, and you most likely will be maxing out the motor very quickly as you move up through gears/revs. At that point your boost pressure will just start to fall no matter what your map says