Voltage measuring circuit, voltage measuring device and voltage measuring system for rotating speed sensor of aviation turboshaft engine

Abstract

The invention provides a voltage measurement circuit, a voltage measurement device and a voltage measurement system for a rotating speed sensor of an aviation turboshaft engine, relates to the technical field of test run of aviation engines, and considers the correlation between voltage measurement connection lines of the rotating speed sensor in an engine unit. A relay is arranged on a switch conversion circuit associated with a first engine unit and a second engine unit, when voltage measurement is carried out on a rotating speed sensor in the second engine unit, the relay is disconnected, and a connection circuit between a frequency doubling module connected with the rotating speed sensor of the first engine unit and the second engine unit is disconnected; the interference of the frequency doubling module on the voltage measurement of the rotating speed sensor of the second engine unit is avoided, the voltage measurement accuracy of the aero-engine rotating speed sensor is improved, and the normal test run process of the aero-engine is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engine test run, and more specifically, to a voltage measurement circuit, a voltage measurement device and a system of an aircraft turboshaft engine speed sensor. Background Art

[0002] Aircraft engine test is the process of simulating the operating environment of aircraft engines on the ground test bench and testing aircraft engines. Before any aircraft engine is officially put into use, its performance, function, strength and reliability must be fully understood and understood so that the engine can safely, effectively and reasonably provide flight power for the aircraft.

[0003] Aviation turboshaft engines are divided into Type I and Type II. Type I turboshaft engines are equipped with an overspeed sensor, and Type II turboshaft engines are equipped with several speed sensors of different speeds. According to the test technical conditions, it is necessary to measure the voltage of the overspeed sensor of the Type I turboshaft engine and the voltage of the speed sensor of the Type II turboshaft engine. Currently, the voltage measurement of the overspeed sensor of the Type I turboshaft engine and the voltage measurement of the speed sensor of the Type II turboshaft engine are carried out in sequence. The output end of the overspeed sensor of the Type I turboshaft engine and the output end of the speed sensor of the Type II turboshaft engine are connected to the same oscilloscope, and then the data collected by the oscilloscope is transmitted to the data acquisition system for analysis.

[0004] In the actual measurement process, Figure 1 As shown, the voltage measurement process of the overspeed sensor of the general type I turboshaft engine is normal, and the measurement result does not indicate a fault. However, when the type II turboshaft engine is put on the stage for test, although the circuit connecting the type I turboshaft engine to the oscilloscope is disconnected, the voltage measurement result of the overspeed sensor of the type II turboshaft engine is easy to indicate a fault. According to research, due to the particularity of the overspeed sensor of the type I turboshaft engine, it is necessary to detect the speed of the overspeed sensor to determine whether the overspeed sensor is working properly. The traditional method is to double the free turbine speed of the type I turboshaft engine through a double frequency unit. However, when measuring the voltage, the output end of the type I turboshaft engine overspeed sensor and the output end of the type II turboshaft engine speed sensor are connected to the same oscilloscope. Due to the existence of the double frequency unit, when the type II turboshaft engine is put on the stage for test, the double frequency unit interferes with the voltage measurement circuit of the type II turboshaft engine speed sensor, causing the voltage measurement failure of the type II turboshaft engine speed sensor, which is not conducive to the advancement of the normal test process of the aircraft engine. Summary of the invention

[0005] In order to solve the problem of voltage measurement failure caused by interference in the voltage measurement circuit of an aircraft turboshaft engine speed sensor, the present invention proposes a voltage measurement circuit and a voltage measurement system for an aircraft turboshaft engine speed sensor to avoid measurement interference and improve the voltage measurement accuracy of the aircraft engine speed sensor.

[0006] In order to achieve the above technical effects, the technical solution of the present invention is as follows: In a first aspect, the present application proposes a voltage measurement circuit of an aviation turboshaft engine speed sensor, including a double frequency module and a double frequency switching switch, and also including a first engine unit, a second engine unit, a switch conversion circuit, a shift switch unit and a voltage measurement display device; a first speed sensor is provided in the first engine unit, and the double frequency module is connected to the first speed sensor through the double frequency switching switch; The second engine unit is provided with a parallel I A second speed sensor is provided in parallel in the shift switch unit. I A first shift switch; a relay is provided on the switch conversion circuit, the output end of the first speed sensor is connected to one end of the switch conversion circuit, and the other end of the switch conversion circuit is respectively connected to the i The output terminal of the second speed sensor and the i one end of a first shift switch, the first i The other end of the first toggle switch is connected to a voltage measurement and display device. i =1,2,..., I , when the second engine unit I When the second speed sensor measures the voltage, the relay is disconnected. I The first shift switches are all closed.

[0007] Preferably, the voltage measurement circuit further comprises a vehicle-platform transfer switch linkage controller and a host computer, wherein the host computer is in communication connection with the vehicle-platform transfer switch linkage controller, and sends a relay switch command to the vehicle-platform transfer switch linkage controller, and the vehicle-platform transfer switch linkage controller receives the relay switch command and controls the closing and opening of the relay on the switch conversion circuit; when the second engine unit is I When the second speed sensor measures the voltage, the platform transfer switch linkage controller controls the relay on the switch transfer circuit to disconnect. I The first shift switch is closed.

[0008] According to the above technical means, when the second engine unit IWhen the second speed sensor performs voltage measurement, the vehicle platform conversion switch linkage controller controls the relay on the switch conversion circuit to disconnect, disconnecting the connection line between the double frequency module connected to the speed sensor of the first engine unit and the second engine unit, thereby avoiding interference of the double frequency module with the voltage measurement of the speed sensor of the second engine unit, and improving the voltage measurement accuracy of the aircraft engine speed sensor.

[0009] Preferably, the second engine unit is also provided with a parallel J A third speed sensor is provided in parallel in the shift switch unit. J A second shift switch; J The third speed sensor j The output terminal of the third speed sensor is connected to the j One end of the second toggle switch, j The other end of the second toggle switch is connected to a voltage measurement and display device. j =1,2,..., J , when the second engine unit I A second speed sensor and J When the third speed sensor measures the voltage, the vehicle platform transfer switch linkage controller controls the relay on the switch transfer circuit to disconnect. I The first shift switch is closed and J The second shift switches are all closed.

[0010] According to the above technical means, the speed sensors of different speeds in the second engine unit have different associations with the first engine unit, but when measuring the voltages of all speed sensors in the second engine unit, the interference between different engine units is taken into consideration, and the relay on the switch conversion circuit is disconnected through the vehicle platform conversion switch linkage controller to improve the voltage measurement accuracy of the aircraft engine speed sensor.

[0011] Preferably, the I The second speed sensor is equipped with I The first car tone wheel switch cable, the first i The output terminal of the second speed sensor is connected to the i One end of the first car tone wheel switch cable, i The other end of the first car tone wheel switch cable is connected to the i one end of a first shift switch; J A third speed sensor is provided with JThe output end of the jth third speed sensor is connected to one end of the jth second car station sound wheel switch cable, and the other end of the jth second car station sound wheel switch cable is connected to one end of the jth second shift switch; when the voltage of the first speed sensor of the first engine unit is measured, I 1st car tone wheel switch cable and J The cables of the second car tone wheel switch are disconnected, the relay is closed, I The first shift switch is closed.

[0012] According to the above technical means, by setting the vehicle platform sound wheel switch cable, it is also possible to avoid the voltage measurement interference caused by the second engine unit to the speed sensor in the first engine unit.

[0013] Preferably, the first rotation speed sensor is an over-rotation sensor.

[0014] Preferably, the voltage measurement circuit of the aviation turboshaft engine speed sensor also includes an overspeed control box, which is connected to the output end of the overspeed sensor, for receiving a speed signal output by the overspeed sensor, and determining whether the first engine unit enters an overspeed state according to the speed signal; the double frequency switching switch is a normally closed switch, and when the overspeed control box is working, the double frequency module doubles the speed signal.

[0015] Preferably, the voltage measurement circuit further comprises: a data acquisition system, wherein the data acquisition system is connected to the voltage measurement display device and is used to analyze the voltage measurement data on the voltage measurement display device.

[0016] Preferably, the voltage measurement and display device is an oscilloscope, which measures the voltage values ​​of the first rotation speed sensor, the second rotation speed sensor and the third rotation speed sensor, outputs voltage waveforms, and transmits the voltage values ​​and voltage waveforms to a data acquisition system.

[0017] In a second aspect, the present application proposes a voltage measurement device for an aviation turboshaft engine speed sensor, wherein the device includes a voltage measurement circuit for the aviation turboshaft engine speed sensor.

[0018] In a third aspect, the present application proposes a voltage measurement system for an aviation turboshaft engine speed sensor, the system comprising the voltage measurement device for the aviation turboshaft engine speed sensor.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The present invention proposes a voltage measurement circuit, a voltage measurement device and a system for an aircraft turboshaft engine speed sensor. Considering the association between the voltage measurement connection lines of the speed sensors in the engine units, a relay is arranged on a switch conversion line associated with a first engine unit and a second engine unit. When the voltage of the speed sensor in the second engine unit is measured, the relay is disconnected, and the connection line between the double frequency module connected to the speed sensor of the first engine unit and the second engine unit is disconnected, so as to avoid interference of the double frequency module on the voltage measurement of the speed sensor of the second engine unit, improve the voltage measurement accuracy of the aircraft engine speed sensor, and promote the normal test run process of the aircraft engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram showing a circuit for disconnecting a type I turboshaft engine from an oscilloscope, as proposed in the background technology of the present invention, and a voltage measurement result of an overspeed sensor of a type II turboshaft engine indicating a fault; Figure 2 A structural diagram showing a voltage measurement circuit of an aviation turboshaft engine speed sensor proposed in an embodiment of the present invention; Figure 3 A structural diagram showing a voltage measurement circuit of another aviation turboshaft engine speed sensor proposed in an embodiment of the present invention; Figure 4 A circuit structure diagram showing that the first vehicle platform audio wheel switch cable and the second vehicle platform audio wheel switch cable are both disconnected in an embodiment of the present invention; Figure 5 A schematic diagram indicating the result of measuring the voltage of the rotation speed sensor in the second engine unit by using the circuit proposed in the embodiment of the present invention.

[0021] Among them, 1-the first engine unit; 2-the second engine unit; 3-the switch conversion circuit; 4-the shift switch unit; 5-the voltage measurement and display device; 6-the vehicle platform conversion switch linkage controller 6; 7-the host computer; 8-the overspeed control box; 9-the data acquisition system; 11-the first speed sensor; 100-the double frequency module; 200-the double frequency switching module; 201-the second speed sensor; 202-the third speed sensor; 401-the first shift switch; 402-the second shift switch; 301-the relay; 300-the first vehicle platform tone wheel switch cable; 400-the second vehicle platform tone wheel switch cable. DETAILED DESCRIPTION

[0022] The drawings are for illustrative purposes only and should not be construed as limiting the present patent; In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual size; It is understandable to those skilled in the art that descriptions of certain well-known contents in the drawings may be omitted.

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limiting the present patent; Example 1 The present embodiment is directed to the voltage measurement of the speed sensor of an aviation turboshaft engine, which is the voltage measurement of the speed sensor of a type I turboshaft engine and a type II turboshaft engine of an aviation turboshaft engine. As described in the background technology, the type I turboshaft engine is equipped with an overspeed sensor, and the type II turboshaft engine is equipped with several speed sensors of different speeds. According to the test run technical conditions, it is necessary to measure the voltage of the overspeed sensor of the type I turboshaft engine and the voltage of the speed sensor of the type II turboshaft engine. The voltage measurement of the speed sensor of the type II turboshaft engine is to measure the voltage and signal waveform of XNHQ100 (gas generator speed) at 98% to 99%, 65% to 66% and XNPTQ100 (free turbine speed) at 100% to 101%, 65% to 66% by an oscilloscope. However, due to the particularity of the overspeed sensor of the Type I turboshaft engine, it is necessary to detect the speed of the overspeed sensor to determine whether the overspeed sensor is working properly. The traditional approach is to double the free turbine speed of the Type I turboshaft engine through a double frequency unit. However, when measuring the voltage, the output end of the Type I turboshaft engine overspeed sensor and the output end of the Type II turboshaft engine speed sensor are connected to the same oscilloscope. Due to the existence of the double frequency unit, when the Type II turboshaft engine is put on the test platform, the double frequency unit interferes with the voltage measurement circuit of the Type II turboshaft engine speed sensor, causing a voltage measurement failure of the Type II turboshaft engine speed sensor.

[0025] like Figure 1 As shown, the five display interfaces correspond to the voltage measurement interfaces of the five speed sensors equipped with the Type II turboshaft engine. It can be seen that there is no normal voltage waveform displayed on the voltage measurement interface, which proves that there is a measurement fault in the voltage measurement of the Type II turboshaft engine speed sensor. After eliminating the cable interference between the five speed sensors and disconnecting the circuit connecting the Type I turboshaft engine speed sensor to the oscilloscope, the voltage measurement result of the Type II turboshaft engine speed sensor is normal.

[0026] In order to solve the problem of voltage measurement failure caused by interference in the voltage measurement circuit of the aircraft turboshaft engine speed sensor, such as Figure 2As shown, this embodiment proposes a voltage measurement circuit of an aviation turboshaft engine speed sensor, in which a double frequency module 100 and a double frequency switching switch 200 are included, that is, considering that the double frequency module does exist, the interference of the double frequency module is overcome, see Figure 2 , also includes a first engine unit 1, a second engine unit 2, a switch conversion circuit 3, a shift switch unit 4 and a voltage measurement and display device 5; wherein, a first speed sensor 11 is provided in the first engine unit 1, and the double frequency module 100 is connected to the first speed sensor 11 through a double frequency switching switch 200.

[0027] The second engine unit 2 is provided with a parallel I A second speed sensor 201 is provided in parallel in the shift switch unit 4. I A first shift switch 401; see Figure 2 The switch conversion circuit 3 is provided with a relay 301, the output end of the first speed sensor 11 is connected to one end of the switch conversion circuit 3, and the other end of the switch conversion circuit 3 is respectively connected to the first i The output terminal of the second speed sensor and the i One end of the first shift switch, i The other end of the first toggle switch is connected to a voltage measurement and display device. i =1,2,..., I That is, each output end of the second speed meter is connected to a corresponding shift switch, and then the other end of the shift switch is connected to the voltage measurement and display device 5. In the specific implementation, the voltage measurement and display device is an oscilloscope. Specifically, in this embodiment, there are two second speed sensors 201, including a first N1 speed sensor and a second N1 speed sensor, and there are also two first shift switches 401, including a first shift switch S1 and a first shift switch S2. Figure 2One end of the switch conversion circuit 3 is connected to the output end of the overspeed sensor, and the other end of the switch conversion circuit is respectively connected to the output end of the No. 1 N1 speed sensor and one end of the first shift switch S1, and is also respectively connected to the output end of the No. 2 N1 speed sensor and one end of the first shift switch S2. The other end of the first shift switch S1 and the other end of the first shift switch S2 are both connected to an oscilloscope. When the voltage of the two second speed sensors of the second engine unit 1 is measured, the relay on the switch conversion circuit 3 is disconnected, and the two first shift switches S1 and S2 are both closed. At this time, although the double frequency module 100 does exist, and when the double frequency module switching switch 200 is closed, it is indeed connected to one end of the switch conversion circuit 3, but disconnecting the relay is equivalent to disconnecting the connection between the first engine unit 1 and the second engine unit 2, avoiding the interference of the double frequency module 100 on the voltage measurement of the speed sensor of the second engine unit 2, and improving the voltage measurement accuracy of the aircraft engine speed sensor.

[0028] See also Figure 2 The voltage measurement circuit proposed in this embodiment also includes a vehicle-platform transfer switch linkage controller 6 and a host computer 7, wherein the host computer 7 is connected to the vehicle-platform transfer switch linkage controller 6 in communication, and sends a relay switch command to the vehicle-platform transfer switch linkage controller 6, and the vehicle-platform transfer switch linkage controller 6 receives the relay switch command and controls the closing and opening of the relay 301 on the switch conversion circuit 3. When the voltage of the two second speed sensors of the second engine unit 2 is measured, the vehicle-platform transfer switch linkage controller 6 controls the relay 301 on the switch conversion circuit 3 to open, and the two first shift switches S1 and S2 to close.

[0029] The second engine unit 2 is also provided with a parallel J A third speed sensor 202 is provided in parallel in the shift switch unit 4. J a second shift switch 402; J The third rotation speed sensor 202 j The output terminal of the third speed sensor is connected to the j One end of the second toggle switch, j The other end of the second toggle switch is connected to the voltage measurement and display device 5. j =1,2,..., J。 That is, each output end of the third speed meter is connected to a corresponding shift switch, and the other end of the shift switch is connected to the voltage measurement and display device. Figure 2There are three third speed sensors 201, including a No. 1 N2 speed sensor, a No. 2 N2 speed sensor and a No. 3 N2 speed sensor. There are also three second shift switches 402, including a second shift switch S3, a second shift switch S4 and a second shift switch S5. The output end of the No. 1 N2 speed sensor is connected to one end of the second shift switch S3, the output end of the No. 2 N2 speed sensor is connected to one end of the second shift switch S4, the output end of the No. 3 N2 speed sensor is connected to one end of the second shift switch S5, and the other end of the second shift switch S3, the other end of the second shift switch S4 and the other end of the second shift switch S5 are all connected to an oscilloscope. In actual implementation, when the voltage of the two second speed sensors and the three third speed sensors of the second engine unit 2 is measured, the vehicle platform conversion switch linkage controller 6 controls the relay 301 on the switch conversion circuit 3 to disconnect, and the two first shift switches are closed and the three second shift switches are all closed.

[0030] In this embodiment, the speed sensors of different speeds in the second engine unit 2 have different associations with the first engine unit 1. However, when measuring the voltages of all speed sensors in the second engine unit, the interference between different engine units is taken into consideration, and the relay 301 on the switch conversion circuit 3 is controlled to be disconnected through the vehicle platform conversion switch linkage controller 6, thereby improving the voltage measurement accuracy of the aircraft engine speed sensor.

[0031] In the present embodiment, the first speed sensor is an overspeed sensor, and the voltage measurement circuit of the aviation turboshaft engine speed sensor also includes an overspeed control box 8. The speed control box 8 is connected to the output end of the overspeed sensor to receive the speed signal output by the overspeed sensor, and judge whether the first engine unit 1 enters the overspeed state according to the speed signal; in a specific implementation, the double frequency switching switch 200 is a normally closed switch. When the overspeed control box 8 is working, the double frequency module 100 doubles the speed signal.

[0032] Example 2 See also Figure 3 In addition to the same components as Example 1, this embodiment proposes another voltage measurement circuit for an aviation turboshaft engine speed sensor, the voltage measurement circuit also includes: a data acquisition system 9, the data acquisition system 9 is connected to a voltage measurement display device 5, the data acquisition system is used to analyze the voltage measurement data on the voltage measurement display device, the oscilloscope measures the voltage values ​​of the first speed sensor, the second speed sensor and the third speed sensor, and outputs a voltage waveform, and transmits the voltage value and the voltage waveform to the data acquisition system.

[0033] In this embodiment, I The second speed sensor is equipped with I The first car tone wheel switch cable 300, the firsti The output terminal of the second speed sensor is connected to the i One end of the first car tone wheel switch cable, i The other end of the first car tone wheel switch cable is connected to the i one end of a first shift switch; J A third speed sensor is provided with J The output end of the jth third speed sensor is connected to one end of the jth second car station sound wheel switch cable, and the other end of the jth second car station sound wheel switch cable is connected to one end of the jth second shift switch.

[0034] like Figure 4 As shown, the two second speed sensors are configured with two first car station audio wheel switch cables, the output end of the No. 1 N1 speed sensor is connected to one end of the first car station audio wheel switch cable, and the other end of the first car station audio wheel switch cable is connected to one end of the first first shift switch S1, the output end of the No. 2 N1 speed sensor is connected to one end of the second car station audio wheel switch cable, and the other end of the second car station audio wheel switch cable is connected to one end of the second first shift switch S2. The three third speed sensors are configured with three second car station audio wheel switch cables, the output end of the No. 1 N2 speed sensor is connected to the No. 2 one One end of the second car tone wheel switch cable, one The other end of the second car station audio wheel switch cable is connected to one end of the first second shift switch S3, the output end of the second N2 speed sensor is connected to one end of the second car station audio wheel switch cable, the other end of the second second car station audio wheel switch cable is connected to one end of the second second shift switch S4, the output end of the third N2 speed sensor is connected to one end of the third second car station audio wheel switch cable, and the other end of the third second car station audio wheel switch cable is connected to one end of the third second shift switch S5. When the voltage of the first speed sensor 11 of the first engine unit 1 is measured, the two first car station audio wheel switch cables and the three second car station audio wheel switch cables are disconnected, the relay is closed, and the two first shift switches S1 and S2 connected to the other end of the switch conversion circuit 3 are closed. Through the setting of the car station audio wheel switch cable, this embodiment can also avoid the voltage measurement interference that the second engine unit 2 may cause to the speed sensor in the first engine unit 1.

[0035] Figure 5This is a schematic diagram indicating the result of the voltage measurement of the speed sensor in the second engine unit using the voltage measurement circuit proposed in this embodiment. It can be seen from the five display interfaces of the oscilloscope that by improving the voltage measurement circuit, the voltage measurement results of the speed sensor in the second engine unit all indicate normal, thereby avoiding interference of the double frequency module 100 with the voltage measurement of the speed sensor of the second engine unit 2, and improving the voltage measurement accuracy of the aircraft engine speed sensor.

[0036] Example 3 This embodiment provides a voltage measurement device for an aviation turboshaft engine speed sensor, and the device includes the voltage measurement circuit for the aviation turboshaft engine speed sensor.

[0037] Example 4 This embodiment proposes a voltage measurement system for an aviation turboshaft engine speed sensor, and the system includes the voltage measurement device for the aviation turboshaft engine speed sensor.

[0038] The embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A voltage measurement circuit for an aviation turboshaft engine speed sensor, comprising a double frequency module and a double frequency switching switch, characterized in that: It also includes a first engine unit, a second engine unit, a switch conversion circuit, a shift switch unit and a voltage measurement and display device; the first engine unit is provided with a first speed sensor, and the double frequency module is connected to the first speed sensor through a double frequency switching switch; The second engine unit is provided with a parallel I A second speed sensor is provided in parallel in the shift switch unit. I A first shift switch; The switch conversion circuit is provided with a relay, the output end of the first speed sensor is connected to one end of the switch conversion circuit, and the other end of the switch conversion circuit is connected to the i The output terminal of the second speed sensor and the i one end of a first shift switch, the first i The other end of the first toggle switch is connected to a voltage measurement and display device. i =1,2,..., I , when the second engine unit I When the second speed sensor measures the voltage, the relay is disconnected. I The first shift switches are all closed.

2. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 1, characterized in that: The vehicle platform conversion switch linkage controller and the host computer are also included. The host computer is connected to the vehicle platform conversion switch linkage controller for communication, and sends a relay switch command to the vehicle platform conversion switch linkage controller. The vehicle platform conversion switch linkage controller receives the relay switch command and controls the closing and opening of the relay on the switch conversion circuit. When the second engine unit is I When the second speed sensor measures the voltage, the platform transfer switch linkage controller controls the relay on the switch transfer circuit to disconnect. I The first shift switch is closed.

3. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 2, characterized in that: The second engine unit is also provided with a parallel J A third speed sensor is provided in parallel in the shift switch unit. J A second shift switch; J The third speed sensor j The output terminal of the third speed sensor is connected to the j One end of the second toggle switch, j The other end of the second toggle switch is connected to a voltage measurement and display device. j =1,2,..., J , when the second engine unit I A second speed sensor and J When the third speed sensor measures the voltage, the vehicle platform transfer switch linkage controller controls the relay on the switch transfer circuit to disconnect. I The first shift switch is closed and J The second shift switches are all closed.

4. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 3, characterized in that: Said I The second speed sensor is equipped with I The first car tone wheel switch cable, the first i The output terminal of the second speed sensor is connected to the i One end of the first car tone wheel switch cable, i The other end of the first car tone wheel switch cable is connected to the i one end of a first shift switch; J A third speed sensor is provided with J The output end of the jth third speed sensor is connected to one end of the jth second car station sound wheel switch cable, and the other end of the jth second car station sound wheel switch cable is connected to one end of the jth second shift switch; when the voltage of the first speed sensor of the first engine unit is measured, I 1st car tone wheel switch cable and J The cables of the second car tone wheel switch are disconnected, the relay is closed, I The first shift switch is closed.

5. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 1, characterized in that: The first rotation speed sensor is an over-rotation sensor.

6. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 5, characterized in that: It also includes an over-speed control box, which is connected to the output end of the over-speed sensor and is used to receive a speed signal output by the over-speed sensor, and determine whether the first engine unit enters an over-speed state according to the speed signal; the double frequency switching switch is a normally closed switch, and when the over-speed control box is working, the double frequency module doubles the speed signal.

7. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 2, characterized in that: The voltage measurement circuit further includes: a data acquisition system, which is connected to the voltage measurement display device and is used to analyze the voltage measurement data on the voltage measurement display device.

8. The voltage measurement circuit of the aviation turboshaft engine speed sensor according to claim 7, characterized in that: The voltage measurement and display device is an oscilloscope, which measures the voltage values ​​of the first rotation speed sensor, the second rotation speed sensor and the third rotation speed sensor, outputs voltage waveforms, and transmits the voltage values ​​and voltage waveforms to the data acquisition system.

9. A voltage measuring device for an aviation turboshaft engine speed sensor, characterized in that: The device comprises a voltage measurement circuit of an aviation turboshaft engine speed sensor as described in any one of claims 1 to 8.

10. A voltage measurement system for an aviation turboshaft engine speed sensor, characterized in that: The system includes the voltage measuring device of the aviation turboshaft engine speed sensor according to claim 9.

Images