HYDRACTIVE 2 PDF

On the Hydractive II, the relation between suspension modes and dashboard switch settings became more complicated: in both settings—Normal (the new name. A stylish 2 piece designed to keep you cool when you’re working hard. Featuring a breathable mesh panel for ventilation, the HydrActive 2. Well Ive been doing some more research.. And I have been reading about the Xantia VSX and its Hydractive 2 suspension set up. I know the.

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Hydrxctive was designed to overcome the biggest problem of the previous system, the very uncomfortable hard mode. Switching to Sport does not mean sticking to a hard, uncomfortable ride any more. On the Hydractive II, the relation hyvractive suspension modes and dashboard switch settings became more complicated: Many models were also fitted with an anti-sink system that locks the system when the car is not running, using yet another sphere.

Its only purpose is to keep the car from sinking when not used, it does not influence the functioning of the suspension system in any way.

The center sphere circuits and supports were redesigned: The elements are practically the same as on Hydractive I:. The front and rear suspension circuits are identical but hydraulically independent.

The electro-valves are driven simultaneously, in parallel. The electro-valve 5 is energized when the suspension is in its soft mode, hdractive, the default electrical position is hard.

Hydractive 2 Advantages/Disadvantages?

However, due to the indirect coupling between this valve and the isolation piston 2 inside the control block, the hydraulics can stay in either position for extended periods hydrsctive time with the electric valve disconnected, depending on the pressure differences between the strut and the main circuits. If the main suspension circuit has nominal pressure, the system stays in hard mode with the electric valve off or disconnected. The two modes are practically the same as on the previous Hydractive system: In hard mode, the electro-valve 5 closes and lets the pressure inside the center sphere 1 move the control piston into a position which closes off the center sphere completely.

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The center sphere 1 is now supplied directly from the height corrector in soft mode. This simplifies the ball valve arrangement with respect to Hydractive I.

The computer uses the same set of sensors as Hydractive I, the hydractiive difference is the vehicle speed sensor which is a Hall-effect sensor now.

Its resolution have been doubled to 8 pulses generated per rotation, that is approximately 5 pulses per meter traveled although this depends somewhat on tire size. It is located on the gearbox where the speedometer cable attaches, or in some versions, on hydrachive cable itself. The internal algorithm of the computer became more sophisticated.

Hydractive 2 | Citroën BX do-it-yourself

Hdyractive difference is in the set of rules the computer uses to evaluate those circumstances: The following table shows the thresholds of steering wheel angle. If the value observed by the sensor exceeds the threshold for the actual vehicle speed and the suspension setting, the suspension will switch to hard mode; it will revert to soft when the corresponding value drops below the threshold for at least 1.

There is a similar table for the thresholds of hyvractive steering wheel rotational speed as well. While the steering wheel is returning to the straight-ahead position, the thresholds are temporarily doubled. The thresholds for body movement obey additional rules. Normally, when the compression the body sinking or the hydracfive the body rising exceeds the hydracrive specified in the Compression and Rebound values in the table, the suspension will be switched to hard mode with a timeout of 0.

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However, under some circumstances, the special Correction thresholds are observed instead. There are two cases leading to these corrected thresholds:. The corrected threshold mode will be cancelled and the threshold returned to the original Compression and Rebound values in the table if the steering wheel angle exceeds the thresholds specified in the fourth column of the table.

The reason for this is to equalize the pressure between all three spheres of an axle. It is important to note that the suspension will switch to soft mode even with the ignition switch turned off.

Hydractive 2

Should the doors remain open with the ignition switch in the off position, the suspension soft mode will be subjected to a minute timeout period to avoid draining the battery as the soft mode requires the electric valves to be energized. The elements are practically the same as on Hydractive I: Trapped among pistons The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard.

Higher intelligence The computer uses the same set of sensors as Hydractive I, the only difference is the vehicle speed sensor which is a Hall-effect sensor now.