VW DCC semi-active dampers

[JasonCSBB]

HI all,

VW has their new DCC "dynamic chassis control" system that uses semi-active dampers.

Anyone know their system bandwidth? Similar to GM's recent magne-ride incarnations?

This vid suggests bandwidth is similar - enough for low-frequency bumps but not high frequency ones:

https://www.youtube.com/watch?v=ftawXV9re2U

More on it:

http://www.my-gti.com/2653/volkswagen-dcc-adaptive-chassis-control-design-and-function

 

[TC3000]

Hi Jason,

Please remember, that such a system is not "active", it doesn't supply energy to the suspension.
It's a form of an "adaptive" damper control, which can vary the energy disipation in the suspension, according to some parameters.

AFAIK the VW system comes from Monroe [Tenneco], produced in Spain and uses Öhlins (CES) valve technology.

If you are interested in some of the in and outs, you may want to have a look at this thesis paper.
in more direct response to your question, step response time for the valve is between 5-25 ms [40 hz], but at higher frequencies, other factors, such as damper (body) stiffness and oil characteristics feature quite strongly as well. But up to 20Hz shouldn't be "a problem".

http://www.diva-portal.se/smash/get/diva2:539767/FULLTEXT01.pdf

 

[TC3000]

to see the difference between a "fully active" and a "adaptive" (sometimes called semi-active) system, you may want to take a look at the following presentation, which compares Tenneco's "active" (ACOCAR) and their "adaptive" (DDC, CES etc.) systems, under different conditions.

http://www.ac-kolloquium.rwth-aachen.de/pdf/Vortr_Nachger/2012/C3.3_Reybrouck_Tenneco.pdf