SU600587A2 - Alarm responsive to process parameter deviation - Google Patents

Description

one

The invention relates to the emergency automation of aircraft and can be used, in particular, to signal a fire or engine failure and to block accidental errors of the crew.

A device for signaling a process variable deviation is known, which comprises an inverter connected via an amplifier to a signal lamp, a rectifier connected to the inverter and to the output of the third OR-NOT circuit, a sensor and a test button connected to the inputs of the first OR-NOT circuit, output which is connected to one of the inverter inputs, to one of the inputs of the second OR-NOT circuit and to the first input of the third OR-NOT circuit, the second input of which is connected to a pulse generator, and the signal pickup button is connected to one of the four inputs OR circuit of the OR-NOT, the output of which is connected to another input of the second circuit OR-NOT, and another input of the fourth circuit OR-NOT connected to the output of the second circuit OR-NOT and to the third input of the third circuit OR NOT.

A disadvantage of this device is that it solves the narrow problem of an alarm and does not use control over the correctness of the emergency situation. The incoming signal, for example, engine fire is not used to monitor

the correctness of the choice of the fire extinguishing body by the pilot, which we find in case there are several fire extinguishing systems on board. The possibility of unauthorized activation of the responsible control authorities in hazardous modes requires special mechanical protection, which is characterized by bulkiness and low speed. These remedies do not release

the pilot from controlling the correctness of the choice of the control body, and in the case of illusions of the perception of the emergency signal (assignment of a fire signal to another fire extinguishing system), use a prohibited body

management At the same time, the information on the parameter overshoot of the critical values allows organizing the process of protecting the responsible authorities of control most of all and removing the protection of the organ automatically in those cases where it is necessary.

The purpose of the invention is to increase the reliability of the device.

This is achieved by the fact that

device introduced switching element

and blocking element, one in. which

connected to the output of the first circuit OR NOT,

and the output of the switching element is connected

to the third input of the fourth circuit OR NOT

and to another input of the blocking element.

The drawing shows a block diagram of a device for signaling a process variable.

The device contains an OR-NOT 1 circuit for activating an alarm using sensor 2 or a test button 3, an OR-4 circuit for triggering an intermittent audible alarm through a gate 5 and light signaling through an inverter 6, an amplifier 7 and a signal lamp 8, a pulse generator 9, OR-NE 10, 11 for disabling the alarm using the button 12 for removing the signal of the switching element 13, as well as the element 14 for blocking the control signal when the crew control element is used incorrectly.

At the initial moment of time, when the signals Xi, Xz, X, X (, are absent (equal to zero), the output of the OR-NOT 1 circuit produces a signal equal to "1, which is fed to the inputs of the OR-NOT 4, 11 circuits and to the input of the blocking element. The signal at the output of the OR-NOT 4 circuit is zero (Y 0), and the output of the OR-NOT 10 circuit is “1, because the signal on the output of the OR-NOT 11 circuit is“ O (O). The blocking element breaks the control circuit and, therefore, the ultrasonic signal is zero, which does not change even when switching element 13 is turned on. The output signal of the inverter 6 is absent, and the warning light 8 is off.

When Xi signals appear (when the parameter goes beyond the critical value) or Xz (when the device is checked), at the output of the OR-NO circuit, the signal becomes zero. The generator 9 pulses periodically generates signals Xs, equal to "1, at the moment of absence of which the circuit OR-NOT 4 generates a signal equal to" 1, including through the valve 5 an audible alarm. At a periodic occurrence of the signal Hz (h + 1, D 0) at the inputs of the inverter 6, both signals are zero, and the output signal is "1 (Hg 1), which through the amplifier 7 switches intermittently on the signal lamp 8.

This alarm allows the pilot to choose the right control, and the signal, 5 equal to zero, at the output OR-NOT 1 removes the ban on the use of the switching element. The alarm is turned off at the time of using the switching element (Hb 1) or when pressing the pickup button, if the sensor detects a false alarm, or when the switching element is used. At the same time, at the output of the OR-NOT 10 circuit, the signal becomes zero, and at the output of the OR-NOT circuit, 11

5 "1. When a pilot detects a parameter’s departure from critical values for other signs (in case of sensor failure) or if it is necessary to use a switching element in special cases (working

control algorithms in training), the control signal lock is released by pressing the check button 3.

The use of protection by the responsible control authority, taking into account the information on the condition of the aircraft, makes it possible to reduce plot errors and reduce the time for generating a control signal, unlike the methods of mechanical protection of the control body.

Claims (1)

Invention Formula A device for signaling the deviation of the technological parameter 5 by author. St. No. 413513, characterized in that, in order to increase the reliability of the device, a switching element and a blocking element are introduced into it, one input of which connects prices to the output of the first OR-NOT circuit, and the output of the switching element is connected to the third input of the fourth OR-NOT circuit to another input of the blocking element.