-
Monitoring of consistency of selector valve position. This monitoring consists in checking that the servovalve position corresponds to the commanded operating mode (active or damping mode).
(10) THS Monitoring
R (Ref. Fig. 025) The monitoring of THS slaving relays K3 is performed when:
-
the hydraulic systems are depressurized
-
the aircraft is on ground
-
the side sticks are at neutral
-and it is launched after each ELAC reset (circuit breaker or pushbutton).
R Servocontrol Position Transducer - Architecture Figure 023
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Position Transducers of the Solenoid Valve Servovalves Architecture R Figure 024
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THS Slaving in the ELACs R Figure 025
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B. Computation of Laws
The laws are described in 27-90.
C. Control Surface Slaving The ELACs perform slaving of the two elevators, one THS actuator electric motor and the 2 ailerons, according to specific laws.
(1) Elevator slaving
R (Ref. Fig. 026) The COM unit in the computers performs three main functions:
-generation of command current
-monitoring of this current through internal wraparound
-slaving engage logic.
-monitoring of the servo valve spool valve transducer In the MON unit, the slaving monitoring consists in monitoring the correct servovalve spool valve position (comparison beween the servo valve current commanded by COM and the spool valve position transducer received by MON).
INTENTIONALLY BLANK
1 1
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Elevator Servocontrol Slaving in the ELAC R Figure 026
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(2) THS slaving
R (Ref. Fig. 025) The COM unit of the computers performs three main functions:
-THS slaving which controls the electric motor.
-Monitoring of the control current.
NOTE : When the concerned computer is not in charge of the THS
____ slaving, the slaving order is synchronized on the actual position of the THS.
-the slaving engage logic by relays K3 and K12 which cut off the
motor current. In the MON unit, the monitoring of the THS position is made through comparison of the actual position with the theoretical position. The theoretical position is computed through the use of "images" of the electric and hydraulic motors. In addition an encoded value of THS position dedicated to COM unit is sent to the MON unit which performs a permanent comparison with its own encoded value. The monitorings are active only if the slaving is engaged.
(3) Aileron slaving
R (Ref. Fig. 027) In the COM unit of the ELACs, there are two main functions:
-slaving proper with generation of the servovalve current.
-monitoring of the generated current through internal wraparound of
the servovalve current. In the MON unit, the two functions below ensure the aileron monitoring:
-
comparison between the deviation signal of the monitoring channel and the servovalve current received from the COM unit.
-
comparison between the aileron position and an order generated in MON. In the damping servocontrol, a constant current (-2mA) is sent to the servovalve.
Aileron Servocontrol Slaving R Figure 027
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D. Self-Monitoring of the Computer The monitorings below are incorporated in the ELAC independently of the functions performed by software.
(1)
Watchdog
(a)
Watchdog main processor A "hardware" watchdog re-activates the microprocessor further to an internal failure. This watchdog is actuated by a software command.
(b)
ARINC processor watchdog
Ditto
(c)
Discrete output watchdog A "hardware" watchdog directly cuts off the discrete outputs and relays if it is not regulary re-started by the main processor.
(d)
Bus monitoring The correct operation of the bus of the digital section is monitored. Upon triggering of this monitoring, the processor is stopped until it is restarted by the watchdog (Ref. Para. (a)).
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