electric power steering

[Kieran Lavin]

I believe you are correct and I believe, to Steve's point specifically about Infiniti they were going to come up with a way to try to synthesize the feedback you get with a "connected" steering wheel somehow.  Kind of like adding "noise" to an electric car so pedestrians will hear you coming I guess


kieran

----- Reply message -----
From: "ndskyz" <ndskyz at hotmail.com>
To: "Matt McCrary" <mattmccrary at gmail.com>, "Steve Hirsch" <shirsch at ptc.com>
Cc: "se-r list" <se-r at se-r-list.org>
Subject: electric power steering
Date: Mon, Jul 28, 2014 7:38 PM

Whoa I think the only car out there that isn't connected to the rack is the New Infinity and it even has a fail safe in case of failure. Electric steering just replaces the old hydraulic pump and it's belt driven parasitic loss with and electric motor. But the steering wheel is still connected to the rack. Some one will surely correct me if I'm wrong here.
BK


-------- Original message --------
From: Matt McCrary
Date:07/28/2014 7:25 PM (GMT-05:00)
To: Steve Hirsch
Cc: se-r list
Subject: Re: electric power steering


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<mailto: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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