GF91.25-P-2011TX Manual Filling/Emptying of the Air Cushions at the Dynamic Seat, Function

GF91.25-P-2011TX Manual Filling/Emptying Of The Air Cushions At The Dynamic Seat, Function
- with CODE (433) Left dynamic seat including multicontour seat
- with CODE (434) Right dynamic seat including multicontour seat

Component Identification:

Function (described on left front seat)
By manually pressing the switch:
^ Left front side cushion adjustment switch
^ Left front lumbar support adjustment switch
^ Left front seat cushion fore/aft switch
the corresponding adjustment request is forwarded to the left front dynamic seat control unit (N32/19), which then actuates the valves in the air cushions accordingly. The air supply necessary to fill the air cushions is ensured by the pneumatic pump for dynamic seat control (M40/1).

Actuation of the left front seat cushion fore/aft switch in "+" direction
As long as the rocker switch is being operated in "+" direction, the seat cushion depth is changed by simultaneously filling the air cushion of the seat cushion (3) (until the max. pressure is reached).

Actuation of the left front seat cushion fore/aft switch in "-" direction
As long as the rocker switch is being operated in "-" direction, the seat cushion depth is change by deflating the air cushion of the seat cushion (3). In doing so, the pneumatic valve remains open for a maximum of t = 1 min (if actuated) after a minimum residual pressure has been reached.

Actuation of the left front lumbar support adjustment switch in "+" direction
As long as the cross-shaped rocker button is operated in "+" direction, the backrest contour changes in the lumbar support area by filling the top or bottom of the currently active lumbar support air cushion (2). On reaching the maximum pressure, the filling is stopped.

Actuation of the left front lumbar support adjustment switch in "-"
As long as the cross-shaped rocker button is operated in "-" direction, the backrest contour in the lumbar support area changes by deflating the top or bottom of the currently active lumbar support air cushion in doing so, the pneumatic valves remain open for a maximum of t = 1 min (if actuated) after a minimum residual pressure has been reached.

Actuation of the left front lumbar support adjustment switch in "up arrow" or "down arrow" direction
After actuating the left front lumbar support adjustment switch, the air pressure of the air cushions in the lumbar support area are stored by the dynamic seat control unit. Starting with the active air cushion, pulsation takes place alternately in the two lumbar support cushions in the sequence bottom and top lumbar support (the sequence is parameterizable). The system starts with filling the active lumbar support air cushion to the next pressure level, unless the upper pressure level has already been reached or exceeded.

Every air pressure adjustment is held for approx. 10 s before the next state is assumed. The pressure difference between deflated and filled lumbar support cushion is 100 mbar. By alternately deflating and filling the lumbar support cushions, a wave motion is accomplished. After approx. 8 min the program ends automatically and the original air cushion pressures are reestablished.

Actuation of the left front side cushion adjustment switch (S109s2) in "+" or "-" direction
The lateral support air cushions (1) can be filled up to the maximum pressure if the button is operated in "+" direction; if the button is operated in "-" direction, they can be deflated to minimum pressure. In doing so, the pneumatic valve remains open for a maximum of t = 1 min (if actuated) after a minimum residual pressure of p = 15 mbar has been reached.

Actuating several switches
When several switches are actuated at the same time, only the adjustment movement with the highest priority will be carried out.
Priority 1 : lumbar support
Priority 2 : seat cushion
Priority 3 : lateral support
Priority 4 : pulsating or dynamic lumbar support

All the functions are interrupted in the event of overvoltage or undervoltage. In the event of an excess temperature in a valve, the respective function is shut down.

Background functions
In the lumbar support area, the cushions are arranged to overlap and therefore coupled as far as their function during the wave sequence is concerned. Because only one air cushion is active, the adjacent cushions are regarded as not active (empty).

To ensure this, the following background functions are necessary:
^ Dead time air emptying
While the pressure is kept constant in the active air cushion (residence time), the adjacent non-active air cushions are emptied.

^ Backgrounds emptying
If the active air cushion is deflated, the residual pressure in the adjacent non-active air cushions is reduced as well as soon as the air cushions have the same pressure.

^ Limit stop emptying
If the end point has been reached after a wave has moved in "down arrow" direction, the residual pressure in the air cushions of the particular area is reduced, as long as the switch is still operated in "down arrow" direction; however, for a maximum time period of t = 1 min.

^ Short-term control
The short-time control adjusts overpressure deviations in the air cushions. It becomes active after each adjustment operation and remains active for only a shorter period of time that is parameterizable. This function is also used to adjust seating or reclining immediately and comfort-oriented.

^ Long-term control
Long-term control becomes active after short-term control. The pressure is controlled such as to always produce the specified nominal pressure. This is accomplished so that it is almost imperceptible for the customer.