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From: Susan on 27 Apr 2010 15:19
I'm looking for a webinar or some other form of help in implementing my controller. I designed a controller using the MATLAB sisotool. My system is fairly simple: a pump, a solenoid valve and a bladder. I'm pumping air into a bladder through a solenoid valve. I've designed a controller which will allow my system to meet my design parameters for settling time and overshoot. I can not "throttle" my pump or solenoid valve. They are both either on or off. I was planning to "duty cycle" the pump, but I don't understand how to use the controller determine the required duty cycle for the pump. Any ideas? I can explain more if someone thinks they can help but need more information.
From: Arkadiy Turevskiy on 28 Apr 2010 14:04
Look at the maximum value of controller request, divide controller request by that value. That will give you duty cycle. Then feed this duty cycle into a subsystem that compares the duty cycle with 0.5 at the required frequency. If duty cycle is less than 0.5, output is 0, otherwise is 1. This will give you a very simple bang-bang controller.

HTH.
Arkadiy


"Susan " <susanreneemueller(a)gmail.com> wrote in message <hr7db8$lc3$1(a)fred.mathworks.com>...
> I'm looking for a webinar or some other form of help in implementing my controller. I designed a controller using the MATLAB sisotool. My system is fairly simple: a pump, a solenoid valve and a bladder. I'm pumping air into a bladder through a solenoid valve. I've designed a controller which will allow my system to meet my design parameters for settling time and overshoot. I can not "throttle" my pump or solenoid valve. They are both either on or off. I was planning to "duty cycle" the pump, but I don't understand how to use the controller determine the required duty cycle for the pump. Any ideas? I can explain more if someone thinks they can help but need more information.
From: Susan on 29 Apr 2010 00:40
Thank you. I have another question. I have a gain of 14, but the max of the controller output is 2.1. I don't understand why 14 is necessary to meet my system parameters, but 2 is only used.
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