electric power steering

[David Pertuz]

Not to pile on, but you were confusing electric *steering* with electric
*assist*. :) The Q50 has electric steering, other cars have electric
assist. Carmakers have been moving from electric to hydraulic assist
largely because of fuel-consumption concerns - the parasitic losses are
drastically lower than with a hydraulic pump. Packaging is better, too.
However, FMVSS requires a direct mechanical connection between the steering
wheel and steered wheels, and the Q50 does have this.

David
Chcago


On Mon, Jul 28, 2014 at 6:25 PM, Matt McCrary <mattmccrary at gmail.com> wrote:

> With electric power steering, the steering wheel is no longer connected
> directly to the rack... If there was an obstruction to the steering, you
> wouldn't be able to feel it in the steering wheel.. It moves the same no
> matter what. As speed increases, many manufacturers reduce the amount of
> angle the wheel turns. They call this speed sensitive steering. They don't
> because of the inherent lack of feedback. Does this help explain?
>
> I'm going to be replacing my B13 SE-R power steering rack with a manual
> rack from an "E" model in the next year... This has even more feedback than
> traditional power steering racks.  :)
> On Jul 28, 2014 5:56 PM, "Steve Hirsch" <shirsch at ptc.com> wrote:
>
>>  Thought I'd pose this here while the list is enjoying a spike of
>> activity. (That and I'm not really active in any current forums.)
>>
>> The general conclusion I draw from reading reviews and approximately zero
>> experience is that electrical PS systems suck because they lack feedback.
>> This seems to be the case across segments, whether the cars be sporty or
>> appliance.
>>
>> I've been struggling to understand why.  C&D did a article on this a year
>> or 2 ago but it didn't really help me much.  As I understand it, hydraulic
>> PS systems use hydraulic pressure to push the steering rack in one
>> direction or the other when the rack is off center, and when the rack is on
>> center then the system pushes neither way.  Why can't electric systems
>> produce the same type of assist?  Why are they necessarily numb?
>>
>> Feel free to ignore if this is too much for one day!  :-)
>>
>> -steve
>>
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