Talk:Active suspension

message: Both Williams and Lotus experimented with active suspensions. In the times of the "inverted-wing" cars, the goal was to provide a constant ride height throughout a lap. See for example the 1987  Lotus 99T-Renault. Later, with the new "flat-bottom" regulation, Williams developed a true active suspension, with computer-controlled length of travel and speed of movement. See for example the 1992 Williams FW14B-Renault. Aldo L (talk) 06:41, 21 November 2010 (UTC)
thread_title:  Formula 1 

message: The Citröen Hydractive system was actually the first mass-produced intelligent system that controlled the two most important parameters in the elasticity of a suspension system: its length of travel and its speed of movement. Most semi-active systems only control the speed of movement via the setting of the shock absorbers, but do not change the setting of the springs. (The Xantia Activa's novel feature was a further development of the constant-height system introduced in 1955 by the DS, this time adding lateral control to the longitudinal control. This feature do not change the setting of the suspension in any manner, though the Xantia was also equipped with the Hydractive system.) Pondering these capabilities, all Citröen Hydractive systems would thus qualify as active systems. Aldo L (talk) 06:50, 21 November 2010 (UTC)
replies: text: Years ago I read a piece in CAR magazine, authored by the late LJK Setright, which claimed that Citroen had a working system on a DS around 1959-60.  I presume that cost and/or complexity in the pre-electronic era prevented it from reaching production.  the same article mentioned AP testing a system later in the 1960s, installed in, of all things, a Hillman Hunter. Mr Larrington (talk) 14:25, 11 August 2011 (UTC)
replies: text: Fully active systems allow the controller total authority over the motion of the wheels and body, to within the limits imposed by their masses. As you reduce the power and bandwidth of the actuators, fully active segues into semi-active, such as variable ride heights, and then adaptive type systems such as variable passive damping and variable stiffness sta bars are even lower on the scale. I am pretty sure that Rolls Royce got seriously interested in an active system based on citreon's technology, but so far as I know neither citreon nor RR ever got close to productionising a powerful active system. Marketing people and fanbois love to refer to 'active' suspensions, but they are rare beasts. Certainly most of the suspensions listed as active in this article are mislabelled. Since, of course, marketing people write the PR blurb, and journalists swallow it whole, and fanbois write wiki articles, inevitably the silly marketing claims end up as cited statements. Oh well, nobody dies as a result, it really doesn't matter much.Greglocock (talk) 07:26, 22 August 2012 (UTC)

text:  To answer the question of Citroen getting involved with Rolls Royce and others, its hydropneumatic suspension was fitted on the Mercedes-Benz 6.9 L: http://www.classicandperformancecar.com/front_website/octane_interact/carspecs.php?see=3446  — Preceding unsigned comment added by 174.116.2.222 (talk) 00:00, 4 October 2012 (UTC)
thread_title:  Citröen Hydractive system 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: Since semi active suspension has its own article why not get rid of all the semi active details from this page? Greglocock (talk) 22:41, 21 April 2017 (UTC)
replies: text: ah it is just a redirect to this article. forget it. Greglocock (talk) 22:42, 21 April 2017 (UTC)
thread_title:  Proposal : Active/semi active 

message: It is hard to claim that it isn't, since a power source and some form of feedback are required, but if it does qualify then it blows this whole article apart. For example the 1955 Citreon system was basically just a way of changing the ride height. Incidentally Lotus realised they were going to lose the PR game when the Infiniti came out. The Infinit system was very low bandwidth and aimed at ride more than handling with fairly limited authority, but /was/ active by any sensible definition, and of course enormously cheaper than the high bandwidth high power system Lotus were developing. Greglocock (talk) 23:20, 22 April 2017 (UTC)
replies: text: My vote is if the car has a "brain" of some kind on board that regulates the suspension, then it is active. The electronics allow greater processing power, but just because ships today are made of steel, doesn't mean that a wooden ship is no longer a ship. PLawrence99cx (talk) 00:48, 24 April 2017 (UTC)
thread_title:  Is variable ride height alone active suspension? 

message: I gather that an editor once read an article about skyhook control theory and it is now plastered all over this article. Are all active suspensions based on skyhook theory, or is this wp:undue ? Greglocock (talk) 20:37, 14 December 2017 (UTC)
thread_title:  Skyhook 

message: DeFacto rightly questions the parameters for this list. I suggest that it should be restricted to production vehicles (not prototypes) and should merely include the first example of each significant step in technology. I know that is somewhat subjective, but of Joe Bloggs had tunable shocks in 1992 I don't see why Boge/BMW introducing them in 1994 is worth mentioning, for example.  However in the interim I'll bung in refs as I find them. Greglocock (talk) 20:52, 15 December 2017 (UTC)
thread_title:  the list again