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From: Kanthaswamy on 2 Jul 2010 05:49
Dear all,
Could anyone help me out in the following control problem.
" I need to control the steering speed of a vehicle by controlling the torque of a electric motor". I already have a motor speed Vs torque data in which the maximum torque capability of the motor is only 5 Nm than the required range of 11Nm.
I need to modulate the value of the motor torque(already existing) using the PID control so that the error(Reference speed - actual steering speed) is minimal.

I get stuck with how to feed the output of the controller(which is the torque) as a modulated value of present motor torque(obtained from the map).

Please suggest me an approach....
pl. feel free to reach me at kantha1980(a)yahoo.com or +91-9787334221.

Thanks in advance,
Kanthaswamy Ganapathy
From: Steven Lord on 2 Jul 2010 09:40

"Kanthaswamy " <kanthaswamyg(a)example.com> wrote in message
news:i0kcmf$gra$1(a)fred.mathworks.com...
> Dear all,
> Could anyone help me out in the following control problem.
> " I need to control the steering speed of a vehicle by controlling the
> torque of a electric motor". I already have a motor speed Vs torque data
> in which the maximum torque capability of the motor is only 5 Nm than the
> required range of 11Nm.
> I need to modulate the value of the motor torque(already existing) using
> the PID control so that the error(Reference speed - actual steering speed)
> is minimal.
>
> I get stuck with how to feed the output of the controller(which is the
> torque) as a modulated value of present motor torque(obtained from the
> map).

It sounds like the first example on this page from the Optimization Toolbox
documentation does something close to what you want:

http://www.mathworks.com/access/helpdesk/help/toolbox/optim/ug/brn4noo.html

Try adapting it to your problem.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
http://www.mathworks.com


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