1260 Skyhook Suspension - Active?

Discussion in 'Multistrada' started by duc996bp, Nov 10, 2019.

  1. Is the skyhook suspension on the 1260s active? I realise diferent parameters can be set manually, custom or pre-set. This will modify preload (rear only), bump and rebound. Are there any changes being made by the skyhook system dynamically once being ridden? I can't find any info on how the system works.
     
  2. You can set preload on the move (think up to 12mph), you can change modes at whatever speed you like. And, unlike many similar bikes, it stays there when ignition off
     
  3. I thought the Skyhook adapted actively to the terrain during the ride(?)
     
  4. It does, but you can’t change parameters while you’re riding, which was the op question.
     
  5. Unless I misunderstood the question. I’m which case yes, it works with the parameters (softer, herder etc) you set in each mode and adjusts to keep the bike in those parameters. So softest will allow lots of play, harder won’t allow much at all
     
  6. Does the "Skyhook" make dynamic changes on the move, not me, was my question? If so, what?
     
  7. Yes it does. It adds comp/reb whatever ot needs to keep the bike in tha parameters
     
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  8. It's not active, it's passive. It only acts once set in it's parameters. It does not adjust to changing road surfaces on the go unless you re-set it in that mode. Active suspension is not used on any bike (production) yet. Not even Moto Gp use it even though their ECU could support such a system.
    It's a bit of a minefield to have a truly active suspension system though because a system can only react to what it already travelled over instead of what it is going to encounter next.
     
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  9. IMHO having had both the 2013 model was better than the DVT one.
     
  10. Definitely semi active and adapts to the surface as you ride.
     
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  11. An interesting difference I have found on the 1260S is that if have it in Touring Mode and then get a good bit of road that you can be aggressive on (in Europe of course) the bike will tighten up the suspension after a short time as if it has been switched to Sport mode, then when things calm down it will after a short time go back to the softer suspension. This happens without any mode change, i.e. still in Touring, its as if it knows its going faster with more lean angle and says I'll tighten things up and then later on when it is all calm it will relax back to touring mode.
    Noticed it several times and I'm not complaining :) Clever Multi?
     
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  12. 1260 specs on the Ducati web site clearly states Skyhook is of the semi-active type. Andy
     
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  13. There is an accelerometer type device under the front fender. If it senses the suspension moving too abruptly it will determine if the fork is about to bottom out and close oil flow to prevent bottoming. This happens in a millisecond. It will also stiffen suspension when you hit a bumpy road or even just speed up on your current bumpy road.
     
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  14. I’d imagine it’s all liked to the imu that work is out lean and how to support TC and cornering abs
     
  15. Think of Skyhook as just that: that the bike is suspended from the sky by hook, with the intention that the system keeps the bike level as you ride. I believe I'm right in saying that it uses a combination of sensors to measure suspension deflection and accelerometers to measure the pitch and lean of the bike. It adjusts damping on the fly, which is why occasionally you might find that damping is wound off to allow for high-speed suspension deflections and will then top out and go all floaty if you go over a crest.
     
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  16. The original Skyhook suspension, as implemented on Multistrada 1200S MY2013 used 4 sensors (all accelerometers), see the Ducati training video:

    With the introduction of the DVT model in 2015, the Skyhook system was modified to include "new software, a rear travel sensor and the IMU refine the system and add more control to the damping in corners" (from https://www.morebikes.co.uk/16493/2015-ducati-multistrada-1200-review/). I've just looked at the parts catalogue as I didn't know where this sensor was located (item 14):
    upload_2019-11-14_9-29-55.png


    Below is a description of the suspension of the 1260S model (from https://www.mcnews.com.au/2018-ducati-multistrada-1260-1260-s-1260-s-d-air/3/)

    The DSS (Ducati Skyhook Suspension) Evolution system has now been developed further. This evolved version includes a new Sachs fork with pressurised damper cartridge and low-friction stanchion, a sensor to control the action of the rear damper plus software that also handles data from the Bosch IMU and features new algorithms.

    Included as standard on the Multistrada 1260 S, the DSS platform has a 48mm Sachs front fork and rear monoshock, both electronic; this allows the DSS to continuously adjust hydraulic damper compression and rebound using semi-active control to ensure correct vehicle balance. In the DSS Evolution system, settings have been further refined to maximise performance, safety, and comfort.

    DSS Evolution technology analyses data from numerous. An accelerometer on the steering yoke, and one inside the control unit that tracks the DDS Evolution provide data on sprung weight while an accelerometer on the fork bottom provides input on unsprung weight. At the rear, another sensor measures suspension travel. The DSS Evolution processes this information via a semi-active control algorithm that, by referring to an imaginary fixed point in the sky above the bike, makes extremely rapid adjustments to the hydraulic damper to minimise vehicle movement in relation to this point.

    To smooth the longitudinal forces of acceleration and deceleration, the system also makes use of the Ducati Traction Control (DTC) longitudinal accelerometer sensor, the ABS system pressure detectors for rapid calculation and activation of a response that reduces resulting vehicle oscillation, and the data from the Bosch IMU which dynamically reveals the bike’s attitude on the two axes (roll and pitch).


    I hope the above helps shed some light on the mysteries of DSS.
     
    #17 steveb123, Nov 14, 2019 at 9:30 AM
    Last edited: Nov 14, 2019 at 11:23 AM
  17. Excellent, thanks Steve