991 NOT FOR ME
04-17-2012, 11:52 AM
#166
Drifting
Neutral observer:
If you put a motor parallel to your steering mechanism, it had better be closed loop. I can't even imagine how you try to control the motor otherwise. With a pot on the steering wheel? I don't think so.
...But using a motor vs hydraulics, this is not necessarily more prone to fail. DC brushless motors and their control electronics are incredibly reliable. If sized properly it's the bearing in the electric motor that will fail before anything else and that will be after millions and millions of revs. I'd venture to trust it more than hydraulic lines. But as to the feel, that will be up to the controls engineers and the transfer functions they write.
If you put a motor parallel to your steering mechanism, it had better be closed loop. I can't even imagine how you try to control the motor otherwise. With a pot on the steering wheel? I don't think so.
...But using a motor vs hydraulics, this is not necessarily more prone to fail. DC brushless motors and their control electronics are incredibly reliable. If sized properly it's the bearing in the electric motor that will fail before anything else and that will be after millions and millions of revs. I'd venture to trust it more than hydraulic lines. But as to the feel, that will be up to the controls engineers and the transfer functions they write.
04-17-2012, 01:45 PM
#167
Nordschleife Master
For those Members interested in the intricacies of the 991's e-steering read this. This link is only available for paid Rennlist Members.
04-17-2012, 01:53 PM
#168
Race Director
Would be true, however, Porsche added sofware... yet another component to increase MTBF issues and system complexity so much more prone to a failure. Software opens up a whole "pandora's box" of potential variables. In contrast, their hydraulic system is simple - power assist right or left. No calculation of yaw rates and really no opportunity for a complete system failure or worst - system continues to work but does the opposite of what the driver wants. This may be a crude analogy but I have never had to reboot my AM/FM radio. It either works or it doesn't - normally when the batteries need to be replace. Now I compare that to Pandora on my Razor... software, operating system, virus, bugs, etc.
04-17-2012, 03:00 PM
#169
Rennlist Member
For those Members interested in the intricacies of the 991's e-steering read this. This link is only available for paid Rennlist Members.
04-17-2012, 07:09 PM
#170
04-17-2012, 07:27 PM
#171
Rennlist Member
Join Date: Mar 2007
Location: West Los Angeles & Truckee, CA
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I agree this is horse ****. What's next 4 wheel drive, full leather, deviated stitching, BT, GPS, back up sensors, oh wait. I guess the horse is already out of the barn. Progress and change is a bitch.
So now that we have two drivers with the 991, if I try and turn left will the SW "argue" and try and keep going straight?
So now that we have two drivers with the 991, if I try and turn left will the SW "argue" and try and keep going straight?
