The operating
principle of the hydractive suspension system for the vehicle is identical .
It is a
suspension with two stiffness states and two damping states (soft/firm).
The
suspension mode changes are controlled, in anticipation, by one of the five
following parameters( PDF Review in
operating principle ) :
· steering
wheel angle
· steering
wheel speed
· braking
· accelerator
pedal depressed
· body
vertical movement
The sensor
parameters are compared with threshold figures which vary with the vehicle
speed.
As soon as a
parameter value exceeds the threshold, a change to the "firm mode"
occurs; the suspension will return to the "soft mode" when the
parameter value is again lower than the threshold and after a delay (PDF Review in operating principle).
Layout of system operation of hydractive technology.
In addition
to the height lever present on all hydraulically suspended , Hydractive cars
posess a mode switch. This enables the driver to select the normal mode, or a
firmer program - 'Sport'. With the original Hydractive (retrospectively called
Hydractive 1), selecting 'sport' simply removed the centre spheres from the
hydraulic circuit permanently. This was fine for twisty roads and/or
enthusiastic driving, but if there was a problem , the car defaulted to 'sport'
mode which most drivers found too hard for normal driving conditions. However,
Hydractive 2 the parameters were
changed. Setting the switch to 'sport' keeps the car in normal mode, but makes
to the car react and switch to the firmer settings earlier and stay there for a
bit longer before softening up again. This can easily be identified within the
car, as the switch is labelled 'Sport'/'Norm' rather than the 'Sport'/'Auto' of
Hydractive 1 (Citroen Car Club ,(n.d) ) .
Switch that
can changes the mode of the driving soft or firm mode.
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