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Ford 9N, 2N & 8N Discussion Forum
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Re: Electric power steering for my 8N

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TheOldHokie

01-14-2020 13:10:29




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AFAIK this vintage of system all use a torsion bar for the steering shaft and the torque sensor is mounted on rings around it so you have mechanical fail safe in the event of any electronic failure.

I was also under the impression the IC used in the motor controller also performed rudimentary control of assist level based on the steering wheel shaft torque sensors. Increases in shaft twist automagically generates more assist at the IC level. That basic adaptuve control is fine tuned for road speed, steering wheel angular velocity, and similar variables by the vehicle or steering specific ECU. Do I have that division of logic wrong?

TOH

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JF in MI

01-14-2020 14:30:16




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 Re: Electric power steering for my 8N in reply to TheOldHokie, 01-14-2020 13:10:29  
No, you have this correct. The difference in the torque sensors determines the amount of power supplied. The harder you turn the steering wheel the more power is applied. I think the confusion comes in about the speed sensor so I'll try to explain. The way the torque sensor works is that the driver "feels" pretty much the same resistance on the steering wheel no matter how much resistance is working against the tires. As the vehicle speeds up the caster, however slight, wants to keep the car tracking straight down the road and "feeling" stable. People complained (I'm assuming) that at faster speeds the steering would become too sensitive so what the computer does is drop the power response so the "feel" (effort put in) is greater. The object being, I assume, is that lightly resting your hand on the wheel at 70 MPH won't cause you the inadvertently steer off the road.

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