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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The rear brakes are powered from the rear suspension circuit. The internal algorithm of the jydractive became more sophisticated. It was this need that also drove the development of the 2CV ‘s interconnected suspension system.

Citroën hydropneumatic suspension – overview

In the case of hydtactive accumulator sphere failure, the high pressure pump is the only source of braking pressure for the front wheels. If the wrong type of fluid is used, the system must be drained and rinsed with Hydraflush, before draining again and filling hydraxtive the correct fluid. Usually steel-sprung cars are either too soft “comfortable”or too stiff “sporty”or some intermediate compromise, while hydropneumatics offer “two cars in one”. Sensors in the steering, brakes, suspension, throttle pedal and gearbox feed information on the car’s speed, acceleration, and road conditions to on-board computers.

The moving parts of the system e. No Slugomatics Modern Junk: Above – height corrector 3 admits hydraulic fluid which “lengthens” the strut and raises the vehicle to its normal ride height. Above – a normally suspended car undertaking the slalom test. Hydrcative only purpose is to keep the car from sinking when not used, hydtactive does not influence the functioning of the suspension system in any way.

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 system provides a soft, comfortable, yet well-controlled ride. The center sphere circuits and supports were redesigned: On the Hydractive II, the relation between suspension modes and dashboard switch settings hycractive more complicated: The hydropneumatic system is a progressive spring-rate suspension, in other words the more it is compressed, the stiffer it becomes.

In Australia, ABS and a driver’s airbag was standard on the SX aside from a very early batch of non-airbag models in ‘ In other words, a fully loaded car will be as equally well controlled as a car with just one passenger.

Above – load P is placed in car and it sinks Left – manual ride height control in Xantia. Buying an year old car, I’d say go for condition and history rather than whether its Hydractive or not. Nitrogen is used as the trapped gas to be compressed, since it is unlikely to cause corrosion.

Hydractive 2 Advantages/Disadvantages?

They also have advantages related to handling and control efficiency, solving a number of problems inherent in steel springs that suspension designers have previously struggled to eliminate. Additional uses of this system included the fully powered self centring steering system DIRAVI or Varipower fitted to the SM and CX, levelling of the headlamps fitted to the SM and a number of design studies were undertaken to investigate hydraulic operation of windscreen wipers, an air dam brake and even the opening and closing of windows.

Anti hysractive suspension is incorporated The rear brakes take hydrctive fluid from the rear suspension which pulls the tail down under heavy braking.

Below the suspension system showing the spheres with the nitrogen represented in blue and the hydraulic hydracyive in red. This section needs additional citations for verification.

Consequently, each time the suspension would rise, the fluid level in the reservoir dropped, drawing in fresh moisture-laden air. The dust inhalation problem continued, so a filter assembly was fitted into the hydraulic reservoir. To jack the car up, all that was required was to place it in the highest suspension position, place a simple stand under the car and then select the lowest suspension position. Electric motor Hybrid vehicle drivetrain Electric generator Alternator.

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These hydarctive recognisable by their grey colouring.

Hydractivr sprung cars can have a rear that is set very soft; one can easily push the empty car down with his hand. At the heart of the system are the so-called ‘spheres’ one per wheel and one main accumulator as well as a dedicated brake accumulator on some models.

Prior to the advent of cheap electronics, a totally hydraulic anti lock braking system had been built, together with zero roll suspension.

The high pressure pump powered by the engine pressurizes the circuit and the accumulator sphere. Hydractive 2 is also fitted to most XM models.

Hydropneumatic suspension

Auto manufacturers try to balance these aims and locate new technologies that offer more of both. When a load is added, it stiffens as much as necessary. Daring to be different p. It is also imperative to always use the correct fluid for the system; the two types of fluids and their associated system components are not interchangeable. Hydractive 1 suspension systems had two user presets, Sport and Auto. More prosaic but nevertheless useful benefits include the ability to drive on terrain that is normally restricted to off-road vehicles, the ability to raise or lower the suspension to assist in loading or unloading the vehicle, to assist in changing a wheel, to facilitate towing and to make washing of the car easier.

Advantages of the system Hydropneumatics are inherently superior to steel springs for reasons that are often misunderstood. Spheres are not subject to mechanical wear, but do suffer pressure loss, mostly from nitrogen diffusing through the membrane.

It sure sounds a more complex system? Well Ive been doing some more research