So adding a steering wheel servo to balance out the first servo ... overkill? It certainly sounds more complicated than adding a single servo to control steering which is the desired result. Take a look at the Roboteq site I mentioned above to see an overview of what I'm trying to accomplish.
Remote control of a full size vehicle
Take a look at http://www.roboteq.com/rcauto.shtml for an overview. They don't say how to get control over the drive shaft but anything which can drive it via chain, spider coupler, or even a replacement gear set instead of steering wheel would work...
Manual takeover needed
This would be more a matter of actuating the existing steering shaft (ahead of the power steering unit) via chain driven from a servo motor. I would not want to play with the hydraulics, although that is possible. The problem with that approach is that it would not be...
Thanks for the ideas etc. I've found a gearmotor with an optical encoder which can be controlled easily in a closed loop interface. I'll use the sprocket gear ratios to get whatever RPM works best in terms of RPM on the driven shaft. The gearmotor I have in mind is backdrivable when unpowered...
I'm looking into implementing some parts of drive by wire on an SUV and need assistance determing the load requirement for steering effort. Braking force is widely published as roughly 150 lbs of pressure but I am unable to find a similar estimate of force needed to turn a steering wheel. I'm...