Quote:
Originally Posted by ClickClickBoom
I think the imprecision in the system comes from the electromechanical/vacuum interface. Speed changes are relatively instantaneous, and vacuum and engine speed are not. Which I would gather they changed to the electronic type system.
|
Actually, the key problem with the vacuum actuator system is that it's an analog system design versus a digital system design as used
in the later Porsches. The analog design stored the desired speed as a capacitor's voltage. The later digital design stores the speed
as a digital value in a register. The latest Porsches starting with 996s don't use a separate module, but have the cruise control function
integrated with the electronic throttle body module.