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Battar
User Rank
Platinum
One more computer to go wrong
Battar   11/29/2012 9:16:10 AM
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Today I drive a car with mechanical linkage and electric power boost (by chance, also a Nissan).  Nissan propose to give me the same, with an extra sensor and wire to the steering mechanism. The electrical signal will be the primary mechanism, but so what? It doesn't replace the existing linkage. Its extra - extra weight, extra power, extra complexity. What happened to "keep it simple" ? Keeping the mechanical linkage in place as a backup is Nissans' way of saying "we like the new system - but we don't fully trust it"

Cabe Atwell
User Rank
Blogger
Re: Mechanical Backup
Cabe Atwell   11/29/2012 2:17:07 AM
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If airplanes mostly work that way, why not cars?

I think the only down side is the number of automobiles on the road. The chances of the system failing are far greater than with cars. You cannot guarantee that the car is professionally maintained. However, if this system is fool proof, I mean that with masses in mind, then it is the future.

Just a thought.

C

Charles Murray
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Blogger
Re: Mechanical Backup
Charles Murray   11/28/2012 6:07:18 PM
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Right, Rob. For now, the clutch is there, but Nissan told us that if the mechanicals were ever removed, its engineers would incorporate a fail-safe sub-system. At this point however, it's not clear how the fail-safe sub-system would work.  

Rob Spiegel
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Blogger
Re: Mechanical Backup
Rob Spiegel   11/28/2012 4:26:50 PM
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Interesting story, Chuck. It seems that the real gain will come when the redundant mechanical steering is eliminated. Yet that means that you wouldn't have steering if the electrical system failed.

Charles Murray
User Rank
Blogger
Re: Mechanical Backup
Charles Murray   11/28/2012 11:48:25 AM
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You're not alone, Greg. I think most consumers will feel safer knowing the shaft is there, at least until steer-by-wire has a few years of success behind it.

naperlou
User Rank
Blogger
Re: Mechanical Backup
naperlou   11/28/2012 10:37:44 AM
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Greg, the backup is absolutely required.  While it is rare, I have been in a car where the power failed and the power steering stopped working.  This was a hydralic system, and it was very hard to steer the car, but at least it could be done.  Electrical systems are more likely to go out on a car, I would venture to guess, than the purely mechanical ones.  Especially electrical systems that are digital. 

Greg M. Jung
User Rank
Platinum
Mechanical Backup
Greg M. Jung   11/28/2012 9:25:33 AM
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I really like the mechanical shaft backup system for this design.  There is always a chance of an unintended failure and this backup shaft is a good way to mitigate this risk.

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