Electrohydraulic Power Steering

[elhigh]

Rack, not pump.

I got the steering quickener idea from a thread on My Tractor Forum, talking about the pros and cons and alternatives to power steering on large garden tractors. The inverted steering quickener stuck with me and was going to be a project, but then I sold my Farmall and became a moot issue.

[Ardent]

Originally Posted by t vago

I would agree, except there is nothing I can find within either the MR2 service manual or on the intertubes that points to a "pressure sensor," as such.

Sneaky!

[Ardent]

Originally Posted by t vago

I know that the combination of current draw and pump speed will directly tell what the loading is, and indirectly what the pump pressure is, so I assume that controlling pump speed is how steering system pressure is controlled.

Sneaky.

[t vago]

Completed installing another Toyota EHPS into my Dakota. Now I have both a Durango and a Dakota with this pump installed. It'll be interesting to see what improvement the Dakota will get, especially since the Karen-mobile suffered a broken water pump last week.

[t vago]

Originally Posted by t vago

I did find at one point a picture of a MR2 pump module with the electronics cover off, showing a nice large shiny coil of copper, but I cannot currently find this picture. I'm willing to bet that this coil is key to measuring current.

Found it! There's the coil, right there!

[gone-ot]

It (copper coiled coil over black plastic) looks like a Hall Effect device, probably specially manufactured for Toyota.