On Fri, 19 Oct 2018 at 19:14, Nicklas Karlsson <[email protected]> wrote:
> I found state space feedback and bode, nyquist diagram are useful also for > state feedback but then state space model is available I have never studied any of that stuff. Which is not to dismiss it, I did Physics at college and am a fan of analysis. But in my day job I basically program controllers (engine management systems) and the theory isn't much help. Partly because exploring the configuration space is impossible in finite time, and partly because exploring the response time gets very expensive, very fast. I work mainly on the idle speed controller. It's PID. Except that there are separate gains for every gear, and for various clutch engagement states. And every P, I and D is an 8x8 map which varies by idle speed error and engine temperature. Many of the points in those curves either are not stable enough to test (400 rpm below setpoint) or don't stay still (-30C coolant temp) so we have to throw theory out the window (whilst acknowledging what it has to tell us) and just turn the knobs in real time listening for the result. (like a trombonist or violinist) -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
