pics of power steering (Page 2/2)
G-Man SEP 22, 08:56 PM

quote
Originally posted by Dennis LaGrua:

I believe that some power steering racks that were used in Fieros are the 85-89 Mercury Merkur, 80's F-Body and Corvette units but don't quote me on this.



80's F-bodies would not have had rack and pinion steering. The 4th gen's did have it though.

Gary
Chief SEP 23, 05:04 AM

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Originally posted by predmeister:

chief, where did you get this chart from? very cool



From this article : Forbes, J., Baird, S., and Weisgerber, T., "Electrohydraulic Power Steering - An Advanced System for Unique Applications,"
Chief SEP 23, 05:11 AM

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Originally posted by pmbrunelle:

The steering sensor *can* be nixed from that block diagram; you can implement power steering without knowledge of the steering angle.

These days, the motor could be AC brushless to eliminate the issue of brush wear.



It is crucial as it ACTIVATES AND deactivates THE ELECTRIC MOTOR when the steering wheel is turned. Otherwise it will run all the time.
Chief SEP 23, 05:25 AM

quote
Originally posted by Dennis LaGrua:

I believe that some power steering racks that were used in Fieros are the 85-89 Mercury Merkur, 80's F-Body and Corvette units but don't quote me on this.
See this thread: http://www.fiero.nl/forum/A...060811-2-073100.html



The Mercury Merkur XR4Ti rack was adapted for use in the Zimmer Quicksilver. It is difficult to find and requires modifications. The newer electric units need extensive modification including a variable assistance regulator and make the the pedal area crowded, especially if you have a clutch pedal.
pmbrunelle SEP 24, 12:00 AM

quote
Originally posted by Chief:
It is crucial as it ACTIVATES AND deactivates THE ELECTRIC MOTOR when the steering wheel is turned. Otherwise it will run all the time.



The crucial measurement in power steering is driver input torque, NOT steering angle.

The function of power steering is to provide an assist torque which is proportional to the driver's input torque.

In the case of hydraulic power steering (whether engine-driven or electric pump), the twist of the torsion bar causes pressurized fluid to push on the right or the left side of the rack's piston.

In the case of purely electric power steering, the twist angle of the torsion bar is electronically measured, and then the electric motor provides assist torque accordingly.

Either way, it come down to the driver twisting the torsion bar with the torque from his arms. Position is not a key parameter.

[This message has been edited by pmbrunelle (edited 09-24-2016).]

Toddster JUL 14, 06:27 PM



















[This message has been edited by Toddster (edited 07-16-2019).]

pmbrunelle JUL 15, 12:25 PM
Cool pics; I had not seen these before.

I especially like the internal memo discussing the technical difficulties they were having with the WS6 cars.

It shows that things are largely the same some three decades later:
  • The factory wants wider tolerances
  • Marketing wants more features that they can sell
  • Test results are not fully repeatable
Toddster JUL 16, 01:07 PM
I have a lot more, I even have the original Diagnosis and Service Manual for the EHPS, schematics, etc. I might see about reproducing it one day. it is really rare. It shows Suty cycles controlled by the VSS for how much assist it gives at certain speeds, etc.


[This message has been edited by Toddster (edited 07-16-2019).]