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01-02-2009, 12:01 PM | #1 |
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Active suspension - how does it work?
Does anyone know how the active suspenion technically works? How is the resistance of the dampers altered in milliseconds?
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01-02-2009, 08:59 PM | #2 |
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I would like to know this as well
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01-02-2009, 11:24 PM | #4 |
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Electronic Damper Control (EDC).
Electronic Damper Control (EDC) reduces variations in wheel load, ensures tyres have excellent traction and counteracts bodyshell movement regardless of the weight your automobile may be carrying - and regardless of the state of the road's surface. EDC can even help shorten braking distances, meaning you enjoy outstanding comfort along with the best in BMW on-road safety. Sensitive sensors constantly monitor all factors influencing the vehicle's behaviour and occupants’ comfort, including road conditions, load changes and vehicle speed. In a fraction of a second, the signals are analysed by the EDC microprocessor and orders are sent to the actuators on the shock absorbers, which, with the help of magnetic valves, are variably adjusted to provide optimal suspension. Thanks to Electronic Damper Control, the tendency for the nose to dip when braking is practically eliminated. The influence of potholes and unevenness on the road surface is reduced to minimum. Whether you're behind the wheel or relaxing in the rear of the cabin, EDC delivers a remarkably smooth and comfortable ride.
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01-02-2009, 11:45 PM | #5 |
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mind you, I am indulging in RBV (red bull and vodka). you can read my paraphrasing below or read the actual article by googling electronic or magnetic shock absorbers
it all starts with the ecu. the vehicle has accelerometers located in several places that send data to the ecu in regards to up and down movements of the car. this, in conjuction with vehicular speed, steering angle and possibly other data is analyzed by the ecu which in turn alters the dampening rates of the shocks. less than 10 milliseconds is required for a system response. the sport setting is a control map that makes all adjustments, including the beginning threshold, more stiff , or a higher threshold for shock movement, or technically a lower flow rate of hydraulic fluid. a lower threshold, i.e. comfort setting, the more fluid can flow, allowing the shock to posess longer travel, or less dampening effect. this physically happens by way of a motor altering the size of the hydraulic channel. the magnetic systems in use utilize metallic particles in the fluid, when these systems are actuated, an electric current (up to 5 amps per corner) causes the metallic fluid to become more viscous and thereby limiting the flow through the orifice. these operate 1/1000 of a second or |
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01-03-2009, 02:38 AM | #6 | ||
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BTW, what happened to you in the end? RBV kicked in suddenly, wife / gf stepped in? |
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01-03-2009, 04:13 AM | #7 |
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fuck all these technical explanations makes it feel like Star Wars!!
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01-03-2009, 04:20 AM | #8 |
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It's not a true active suspension, like lotus experimented with in the past where it would increase the hydrolic pressure depending on what the car is doing. Those cars had NO LEAN when turning.
MB's system is a semiactive system, where the small bounces are handled by the springs, but larger motions, like body roll are handled by changing the pressure in the struts. I believe the EDC just varies the valving depending on the road and style of driving.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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01-03-2009, 04:53 AM | #9 |
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01-03-2009, 10:34 AM | #10 |
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The GM/Ferrari shocks have tiny metal particles suspended in the fluid and the system is able to vary the thickness of the fluid by changing the charge through the fluid. It's pretty slick. I believe the EDC is a valve based system though.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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01-03-2009, 10:37 AM | #11 |
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Where there any problems with EDC in the past?
The M5 and M6 have them too, right? Audi uses DRC (Dynamic Ride Control) which is great (especially on the RS4) if it works. (there were some problems with leaking shocks) |
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01-04-2009, 07:54 AM | #12 |
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Exactly. The GM/Ferrari system uses a "magneto-rheological fluid" which operates like ssemerod explained a few posts up. BMW's operates by changing the valving/orifices.
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01-04-2009, 04:15 PM | #13 | |
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Hope that helps. Cheers, e46e92
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01-04-2009, 09:15 PM | #14 | |
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01-05-2009, 05:45 AM | #15 | |
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01-05-2009, 08:20 AM | #16 | |
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Cheers, e46e92
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01-05-2009, 10:15 AM | #17 |
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Both COMFORT and NORMAL are active suspension modes, only SPORT mode is passive (set at 75% of maximum damping).
Best regards, south
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01-05-2009, 10:20 AM | #18 | |
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Cheers, e46e92
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01-05-2009, 10:33 AM | #19 |
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12-04-2013, 11:23 AM | #20 |
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Reviving an old thread...
How quickly does it change from say comfort to normal after you hit the button?
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12-04-2013, 12:30 PM | #21 | |
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Cheers
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12-04-2013, 12:59 PM | #22 |
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There is missing/incorrect information in this thread, so allow me to set the record straight:
Cars without Competition Package (ZCP): -comfort is dynamic -normal is dynamic -sport is static Cars WITH Competition Package (ZCP): -comfort is dynamic -normal is dynamic -sport is dynamic Some drivers do not like the stiffer ride settings and feel it is too artificial since it isn't providing them the right amount of feedback. A few tests showed that lap times in the different modes were not vastly different. The purists shy away from it entirely. My advice is to use comfort for your street driving (unless you like having your teeth rattled out), and to experiment with the three settings when on the track. It's quite subjective in many ways.
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