drive by wire-that's exactly what it is
Dear panic,
A drive-by-wire system is exactly what I'm trying to do. I want to converge all driving operations (steering , accn,gear-shifts,brakes,etc.) into a single joystick. The motivation----> as a part of my master's degree project.
I have already designed a system which recieves joystick input to control a stepper . But :
- this system is way too slow
- torque is a problem if this motor is to be geared for speed.
Mr . Nigel and others suggested a DC motor servo system . As you rightly pointed , an open loop is fine for this . But my primary need for an encoder is to make the LM629 work for DC motor PID servo control.
Added benefits include :
- closed loop control including holding torque.
- high rpm motor can be geared for torque.
- computer Interface (virtual steering display.)
My plan of action for other features like accn,brakes is to use steppers with a rack and pinion arrangement, to provide linear movement at the brake pedals.
Thanks to every one for their input