Random thought about drive by wire

[Boinked]

So while driving down the road i started thinking about drive by wire steering. Then of course my jeep popped into my head. Then i questioned if a drive by wire system would be powerful enough and fast enough to negate death wobble.

As death wobble is just the steering rhythmically moving left to right. Do you think it could negate the huge amount of force the larger tire put on the steering system.

While this is purely hypothetical and to my knowledge no one has ever put one in a jeep wrangler. To my wondering mind i would watch that YouTube video......

 

[jjvw]

The DbW system would need to counteract precession as it occurs with the tires.

 

[qslim]

I always thought that drive by wire steering systems are a solution looking for a problem. Just doesn't seem to add value to a vehicle. Throttle by wire? Sure, makes sense. The throttle valve itself can be incorporated into the rest of the system for a little more efficiency, and the packaging is simpler. But the concept of turning the steering wheels is something that is so devoid of any other variables that executing that function with an electronic system just doesn't make sense.

For death wobble you'd need something pretty sophisticated... High rate of sampling frames & a motor that is not only big enough to turn the pitman but fast enough to counteract the precession. It'd be easier to just throw away the dropped pitman

 

[JEEPCJTJ]

For death wobble you'd need something pretty sophisticated... High rate of sampling frames & a motor that is not only big enough to turn the pitman but fast enough to counteract the precession. It'd be easier to just throw away the dropped pitman

If it ever gets to that point the pitman arm will be gone the way of leaf springs.

 

[Boinked]

The system would completely remove the gear box. From What I have seen in my Google searchs on drive by wire. They are similar to a standard rack and pinion.

This would remove the angular force on the box and turn it into a linear force.

The information I have read ssys the drive by wire runs around 1000 checks per second. But no mention on how much force it applies to turn the wheel.

Just imagine if a that system could detect unbalanced tires or bad ball joints and correct for them while some how reporting the problems.


Keep in mind.... this is a completely hypothetical concept. In no way do i .... nor would I want a drive by wire..... i like to know my steering wheel is physically connected to the tires.

 

[ColoJeep]

This hypothetical concept is scary. If touch screen radio and HVAC controls are any indication of tech gone stupid, count me out.
I'll take the old school Saginaw steering box thank you. I don't even like the 2003+ made in India "Mercedes" steering box.
I can't even think about steer by wire ! Just like "electric" power steering all this crap is made to increase the profit margin of the
manufacture at our expense!

 

[Boinked]

This hypothetical concept is scary. If touch screen radio and HVAC controls are any indication of tech gone stupid, count me out.
I'll take the old school Saginaw steering box thank you. I don't even like the 2003+ made in India "Mercedes" steering box.
I can't even think about steer by wire ! Just like "electric" power steering all this crap is made to increase the profit margin of the
manufacture at our expense!

Unfortunately Drive by wire is in a few cars already. Most notably the Infiniti Q50. Tesla is going that way. I also believe a few super cars have it.

This was more of a thought process about known issues with solid front axels and could a drive by wire stop them.

On a side note..... brake by wire scares me more...... currently (to my knowledge) its only the parking brake that has been implemented

 

[Zorba]

This hypothetical concept is scary. If touch screen radio and HVAC controls are any indication of tech gone stupid, count me out.
I'll take the old school Saginaw steering box thank you. I don't even like the 2003+ made in India "Mercedes" steering box.
I can't even think about steer by wire ! Just like "electric" power steering all this crap is made to increase the profit margin of the
manufacture at our expense!

WORD. All this crap is, like @qslim says, a solution in search of a problem. Or the answer to a question nobody was asking.

 

[qslim]

DBW steering & braking just doesn't make sense to me. There are very few variables in these systems & at the end of the day I just don't see any advantage from a driver perspective.

The jets I work with have been fly by wire for a couple of decades now, & the systems work really well. It basically comes down to differentiating between the pilot demanding a control surface deflection vs demanding a change in attitude. Legacy flight control systems were connected to pilot inputs via cables, and that meant that the pilot had to understand & think about everything that was happening as the jet was moving through the sky. If you stab the left pedal it will make the rudders deflect a certain direction, but depending on your airspeed, angle of attack, weight, center of gravity, altitude, & other variables the outcome will be different every time.

Modern fly by wire systems aren't directly connected to the flight control surfaces, so the pilot input is understood as a request by the flight control computers. If the pilot pushes on the left pedal the computer takes that as a request to make the jet yaw to the left, and it will make that happen regardless of what it has to do despite every other variable. It works great & pilots love it.

Why you would need that on the ground when you're just turning two wheels left or right & making calipers squeeze a disc is something I don't understand.

 

[Dr. Internet]

To continue your analogy, the B-2, or Flying Wing, is inherently unstable. Sort of a Death Wobble by Design. It cannot fly without onboard computers constantly monitoring the flight conditions and responding with control surface adjustments to compensate for the instability. Again, the pilot inputs are considered as requests by the systems that make the actual decisions to move the control surfaces. Seems to work pretty well, but is a bit expensive for a Jeep. Further, Jeeps are not inherently unstable. They are just "close" to unstable, so any number of relatively minor issues with steering and suspension can push it into an unstable mode, called Death Wobble.

 

[Bsulzberger]

I have electric power steering in my Camry, and I like the way it responds in that car. It has no give or play at all in the steering, so don't think that would be good in a jeep. Lots of torque and rocks, it's nice to have some play in the system.