-generate the orders and analog command
-re-read these orders to verify the correct operation of the digital/ analog converter
-control a certain number of relays (transmission of orders to the servovalves, transmission of power supply to the inductive transducers)
-provide the interface for 16 discrete inputs and 8 discrete outputs.
6. Operation
_________
A. General The Spoiler Elevator Computer (SEC) is organized around two channels : (Ref. Fig. 027)
-
The command channel
-
The monitor channel.
The command channel receives analog sensor data, ARINC data and discrete
signals in order to generate the flight commands used to drive the
corresponding servo control.
The connections between the computer and the servo control are of the
analog type.
The monitor channel independently receives the transducer data required
to compute the control laws. Its role is to monitor the computations of
the command channel and in particular the servo loop.
The data exchange between the two channels, in order to perform the
consolidation and synchronization operations, takes place on a high-speed
ARINC bus.
Each channel includes a digital part and an analog part.
The digital part is built around two processors :
-
a main processing unit for input/output system management and control law computation based on a 16-bit microprocessor (INTEL 80186).
-
a digital control unit for high-speed servo loop computation, real-time alternative input acquisitions and servo control monitoring based on a 16-bit microprocessor (INTEL 80C86).
The analog part converts the commands computed by the software into
control currents.
They are transmitted to the control surfaces as follows :
-to the spoilers through COM relays for which the power supply and activation commands are generated by the MON channel (Ref. Fig. 028)
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SEC - Internal General Architecture
Figure 027
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Spoiler Servovalve control
Figure 028
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-to the THS and elevators through MON relays in series with the COM
relays. In addition, the currents are read and monitored by the software in the COM channel only.
B. Functions Each channel performs five main functions :
-input management
-control law computation and synchronization
-servo loop processing
-engage logic
- output management
In addition, each channel has its own power supply.
(1) Input management
This part ensures acquisition of the input parameters.
These take various forms :
(a)
analog DC signals from position transducers on the side stick, speedbrake control unit and throttle (ANI 1). Analog DC signal acquisition is shown (Ref. Fig. 029) An adaptation circuit receives the DC signals from position transducers. It amplifies and sends them to a multiplexer circuit. The multiplexer selects one input out of 32 and sends it to an A/D converter which transmits the information to the CPU board. A VREF circuit sends cold points of the potentiometers to the CPU 186 board which can detect, by software, an anomaly in the potentiometer supplies. The potentiometer power-supply circuit receives 28VDC and generates a 15VDC to supply the potentiometers. The acquisition principle of the analog DC accelerometer signals (ANI 4) is the same as for the potentiometers.
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