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Re: Electric power steering for my 8N

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Author  [Modern View]

01-14-2020 16:38:27

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If you think about it the torque sensor can simulate road feel all by itself. I think that was it's original purpose and that is why I wanted you to test grass vs concrete. The motor controller logic "should" be able to maintain a constant steering effort over varying ground conditions with no need for any additional sensor data. It's just a shaft torsion value that can be maintained directly using a simple IC. No computer needed. I'd still like to see that test when weather permits. I bet you could figure out a way other than the bolt to attach that torque wrench to the wheel if you gave it a little thought.

I believe that simple feedback model quickly evolved into something else. Modern cars have lots of data, a network bus with lots of bandwidth, and ECUs with plenty of processing power. So the engineers started to create a conputational model that used data like road speed, stability control sensors, wheel slip, wheel angle, etc to try and make the steering motor smarter than the driver. In other words I am not sure the "speed sensor" line is used solely for that purpose in today's cars. I suspect it has evolved into a general purpose biasing signal to the IC in the motor controller. It is likely managed by the ECU and is the computationally derived result of a model that incorporates many operational factors and more sensors than just road speed. But I could also be full of it ;-)


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JF in MI

01-14-2020 18:29:55

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 Re: Electric power steering for my 8N in reply to TheOldHokie, 01-14-2020 16:38:27  
Yes, I'm sure there are more things speed data is used for but I was trying to "dumb it down" for the purposes of using these units to add power steering to other vehicles, of different manufacture, not having PS in the first place. The point I'm trying to make is that not all electric PS modules will work for this, at least not without spending a pant load of more money.

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