SU1191766A1 - Device for measuring pressure - Google Patents

Abstract

MEASURING DEVICE. PRESENT, containing a full pressure sensor, a static pressure sensor, two failure alarms, whose inputs are connected to the frequency outputs of the full and static pressure sensors, respectively, differing in that, in order to increase reliability, it contains a differential pressure sensor and a static pressure sensor, the third failure detector, an adder, a subtractor, two switches and two AND elements, the frequency output of the full and static pressure difference sensor connected to the input of the third signal a failure lysator, the output of which is connected to the direct inputs of the first and second elements And, the code output of the differential and full pressure difference sensor is connected to the first inputs of the adder and subtractor; the inputs of the first and second elements And, respectively, whose outputs are connected to the second control inputs of the first and second switches, respectively, the first information inputs of the first (L in The first and second switches are connected to the full and static pressure sensors, respectively, the second information inputs of the first and second switches are connected to the outputs of the adder and subtractor, respectively, and the outputs to; 0, the second inputs of the subtractor and adder, respectively, and are outputs of the full and static pressure. K1 devices respectively. Od 0)

Description

one

The invention relates to a measurement technique and can be used in flight-navigation information on aircraft formation.

The aim of the invention is to increase reliability.

The drawing shows a block diagram of a device for measuring pressure.

The device for measuring pressure contains static pressure sensors 1, total and static pressure differences 2, total pressure 3, the frequency outputs of which are connected to the fault alarms 4, 5 and 6, elements 7 and 8, the forward inputs of which are connected to the fault alarms 5 output , and inverse - with the outputs of the failure alarms 4, 6 simultaneously connected to the first control inputs of the switches 9 and. 10, the second control inputs of which are connected to the outputs of the elements And 7, 8, the code output of the sensor 2 is connected to the first inputs of the subtractor 1 1 and 3 of the mapper 12, the outputs of which are connected to the first information inputs of the switches 9, 10, and their information inputs are connected to code outputs of sensors 1 and 3, respectively, the outputs of switches 10 and 9 are connected respectively to the second inputs of subtractor 11 and adder 12 and are device outputs at static and total pressure.

Failure alarms are known devices. For example, for sensors with frequency output, which, when the input pressure changes, changes the output frequency at a constant amplitude of the output signal, a peak detector circuit with a discharge resistor can be used.

The proposed device works as follows.

917662

The signals from sensors 1 and 3, proportional to pressure, are received through switches 9 and 10 at the output of the device.

5 The closed or open position of the respective inputs of the switches 9 and 10 is determined by the signals from the outputs of the fault analyzers 4, 5 and 6.

With the normal operation of static sensors 1 and full 3 pressure their code signals through switches 9 and 10, respectively

15 arrive at the output of the device.

If the static pressure sensor I fails, the element And 7 and the switch 9 are switched, and the signal from the sensor 2 of the difference between the total and static pressure (, -Pg) is subtracted on the subtractor 11 from the signal P "and is outputted to the statistics I

the pressure of the device is 1P.

H S T

p „-yr).

If the full pressure sensor 3 fails, a similar process occurs, the element 8 and the switch 10 are switched, the signal with

The Q sensor 2 of the difference between the total and static pressures (-P) is added on the adder 12 with the signal Pp and is fed to the output of the total pressure of the device (P. P + DP).

The failure of the sensor 2 of the difference between the total and static pressures does not disrupt the operation of the device, since the switches 9 and 10 remain in the initial position.

Introduction to the device of the differential pressure of the full and static pressure allows to increase the reliability of its work, because when any sensor goes out of operation, the device

f continues to function normally.

Claims (1)

DEVICE FOR MEASURING. PRESSURE, comprising a full pressure sensor, a static pressure sensor, two failure signaling devices, the inputs of which are connected to the frequency outputs of the full and static pressure sensors, respectively, characterized in that, in order to increase reliability, it contains a difference sensor of the total and static pressure , the third failure indicator, adder, subtractor, two switches and two AND elements, and the frequency output of the difference sensor of the total and static pressure is connected to the input of the third signaling device A failure point, the output of which is connected to the direct inputs of the first and second elements AND, the code output of the differential and total pressure difference sensors is connected to the first inputs of the adder and subtracter, the outputs of the first and second failure indicators are connected to the first control inputs of the first and second switches and inverse inputs of the first and the second elements And, respectively, whose outputs are connected to the 'second control inputs of the first and second switches, respectively, the first information inputs of the first and second Mutators are connected to the code outputs of the sensors of full and static pressure, respectively, the second information inputs of the first and second switches are connected respectively to the outputs of the adder and subtractor, and the outputs are connected to the second inputs of the subtractor and adder, respectively, and are the outputs of the full and static pressure of the device, respectively. 1191