Tein Active EDFC?? Yes please :)

[Lauren]

Sorry if the pic isn't crystal clear but this is the matrix for the longitudinal G options. A= acceleration and B=braking.

the values for 64 in the 'Ft' and 'Rr' colummns are what you're looking at really. Yes I know 64 scale on the preset is a multiple of the 16 scale, but you can tune the 64 scale one at a time, this is just a basic setup.

I am using G1 as it's a little less aggressive.

[Racecomp Engineering]

I'd love to try it sometime.

- Andy

[DougW]

Originally Posted by Shankenstein

Probably a stupid question, but has anyone attempted to mount a linear displacement sensor IN or ON a shock/strut for this type of control?




I know they're regularly used to tune real racecars, but only for data acquisition purposes.

I'm sure we could use accelerometers, but the data would be sketchy at best. One on an unsprung component and one on a sprung component. Subtract to get the differential movement. Lots of noise in the data, mounting issues, etc.

If you wanted to go full-retard (and don't we all?!), take that data and stream it into a recursive least squares algorithm using a basic suspension model. Snag the coefficient related to damping, and input that to a controller. As with most tracking applications, you'd try to minimize the observed error (between critical damping and the estimated coefficient). Even a simple "proportional + dead zone" controller would get the job done.

*scratches my chin stubble* That kind of a solution would "auto-tune" your suspension. Seems like a very marketable product for one-time passive tuning or always-on active tuning.

Yes I have done this on a shock dyno and the 2013 Porsche 998 comes with the A arm sensors stock and yes with the Bilsteins I can change the curve during the stroke but the kit for the FR-S for the cost can't do this yet. I write the software/hardware so anything can be done, just need ideas and test cars.
DougW

[Calum]

Originally Posted by DougW

Yes I have done this on a shock dyno and the 2013 Porsche 998 comes with the A arm sensors stock and yes with the Bilsteins I can change the curve during the stroke but the kit for the FR-S for the cost can't do this yet. I write the software/hardware so anything can be done, just need ideas and test cars.
DougW

In keeping with what @ZDan was saying, could you write code to allow ful PID control based on the g meter's feedback? Or are you limited to a lookup table style of control system?

[DougW]

The Damptronic package is PID feed forward control with look up tables set based on accel,brake pressure, lat g, lng g , steering rate and speed all updating in around 30 msec per shock. I don't know about the Tein with a stepper but I suspect is similar with the effect on control, unless you have felt the shocks responding to input you really can't complain about the theory. Either way either package is moving performance ahead and I look forward to what comes next, this is fun stuff and a great platform to play with.
DougW.

[Shankenstein]

Originally Posted by DougW

The Damptronic package is PID feed forward control with look up tables set based on accel,brake pressure, lat g, lng g , steering rate and speed all updating in around 30 msec per shock. I don't know about the Tein with a stepper but I suspect is similar with the effect on control, unless you have felt the shocks responding to input you really can't complain about the theory. Either way either package is moving performance ahead and I look forward to what comes next, this is fun stuff and a great platform to play with.
DougW.

Your project is awesome, btw. As a newbie to electronic suspensions, I'm trying to ramp up quickly.

To help the book learners, here is a useful link: LINK to PDF

The real goodies lie on pages 22-24. That talks about what damper characteristics are useful in different situations.

Back on topic, there are two main modes of Damptronic shocks, which you can endlessly adjust between.


The tighter restriction, the "stiffer" the damper responds to a change in position (velocity). When it comes to dampers, the usual equation is:
F = -b * v
where
F = damping force
v = velocity (rate of change for displacement between the upper and lower shock mounts)
b = damping factor (and eventually ratio)

For Damptronic, "b" is highly adjustable, just like with normal adjustable shocks. The fun really comes in when you can adjust on-the-fly. If you can react fast enough to things like weight transfer and road bumps, you'll be able to strong-arm (or soft-arm) the suspension to react appropriately for the situation. "Appropriately" is highly dependent on your application, though.

Here's a range of adjustment that I found.


Also, here's a more technical drawing:


Also, for those who haven't seen it... the Bose Project Sound. Electronically actuated suspension. Think of a speaker voice coil as the suspension. Although the idea was never put into production, it did evolve into Bose Ride (truck driver seat suspension tech).
[ame="https://www.youtube.com/watch?v=z3gX2HwFf5I"]Bose Active Suspension - Leaping Lexus - YouTube[/ame]

[cdrazic93]

whoa

[DougW]

Didn't mean to hijack the thread on Tein just think either way is cool stuff. Our main product is replacing the OEM controllers with plug and play boxes for the Porsche, GTR and Viper srt that remap the curves for performance and not just marketing. The new Porsche with the built in travel sensors will be fun because we can do so much more on the fly. I added this to the FR-S because I love the car and needed a test car not really to create a retail market but here I am one more time. Keep the ideas coming.
DougW