Brake temperature sensor monitoring unit test circuit and device

Abstract

The utility model relates to the technical field of airplane brake temperature monitoring, in particular to a brake temperature sensor monitoring unit test circuit and device. Comprising a power conversion module, a mode switching module and a connector module, wherein the connector module comprises a connector male end and a connector female end; the connector male end is in plug-in connection with the connector female end and is used for sending a sensor sampling signal sent by an external temperature sensor to the connector female end; the input end of the power conversion module is connected with an external signal source, and the output end of the power conversion module is connected with the input end of the mode switching module and used for converting an alternating current signal output by the signal source into a direct current signal suitable for a circuit; the output end of the mode switching module is connected with the direct current input end of the connector female end, and the mode switching module is used for adjusting the signal type of a device sampling signal sampled by an external signal sampler according to on-off of the mode switching module. The beneficial effect of improving the test efficiency can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft brake temperature monitoring, and in particular to a brake temperature sensor monitoring unit test circuit and device. Background Art

[0002] The aircraft's brake temperature monitoring system is a key component in ensuring safe aircraft operation. This system helps prevent overheating and potential failures by monitoring the temperature of the aircraft's brake system in real time, thereby ensuring the safety and reliability of the aircraft during takeoff, landing and taxiing.

[0003] Figure 1 This is a block diagram of the principle of a typical aircraft brake temperature monitoring system. This system includes 2 brake temperature sensors, 1 BTMU (Brake Temperature Monitoring Unit), 1 BSCU (Brake System Control Unit), 1 ECAM (Electronic Cockpit Alert Monitor) and 1 brake overheat warning light. The brake temperature sensor monitoring unit (BTMU) installed on the aircraft axle collects the analog signals of the 2 brake temperature sensors installed on the brake assembly, and transmits them to the brake / turn control unit (BSCU) after signal processing. The brake / turn control unit (BSCU) then transmits the processed signals to the aircraft centralized electronic monitoring system (ECAM) installed in the cockpit, and displays the corresponding signals at the same time. If the brakes are overheated, the brake overheat warning light installed in the cockpit will light up.

[0004] It can be seen that the brake temperature monitoring system (taking Airbus320 as an example) has 4 temperature sensors, 2 brake temperature sensor monitoring units (BTMU) and a brake / turning control unit (BSCU). The BTMU component is installed on the aircraft landing gear axle, which can monitor and collect the temperature signal of the brake temperature sensor in real time and feed it back to the aircraft pilot through the computer. The pilot makes corresponding processing according to different signals to avoid aviation accidents.

[0005] With the development of civil aviation industry at home and abroad, the number and types of domestic aircraft have increased significantly. Aircraft have been operating in complex ground environment and high-altitude meteorological environment for a long time. In addition, various factors have led to a large amount of dismantling and maintenance of brake temperature sensor monitoring units (BTMU). A large number of domestic brake temperature sensor monitoring units (BTMU) that need to be dismantled and repaired need to be sent to foreign original manufacturers for repair. Not only is the maintenance cost expensive and the cycle is long, resulting in a decrease in aircraft utilization. In order to shorten the aircraft parking time, airlines need to purchase a large number of spare parts, which greatly increases the operating costs of airlines. Although the manufacturer's maintenance manual currently provides the tools and gauges required for the maintenance steps, there is a complex overlap process between the various tools and gauges, resulting in low test efficiency.

[0006] Based on this, how to meet the domestic maintenance needs of a large number of brake temperature sensor monitoring units (BTMUs) and improve testing efficiency is a technical problem that needs to be solved urgently. Utility Model Content

[0007] The purpose of the present application is to provide a brake temperature sensor monitoring unit test circuit and device, which can achieve the beneficial effect of improving test efficiency.

[0008] In a first aspect, the present application provides a brake temperature sensor monitoring unit test circuit: the circuit includes a power conversion module, a mode switching module, and a connector module, the connector module includes a connector male end and a connector female end;

[0009] The connector male end is connected to the connector female end, and is used to send a sensor sampling signal sent by an external temperature sensor to the connector female end;

[0010] The input end of the power conversion module is connected to an external signal source, and the output end of the power conversion module is connected to the input end of the mode switching module, for converting the AC signal output by the signal source into a DC signal corresponding to the test circuit;

[0011] The output end of the mode switching module is connected to the DC input end of the female end of the connector, and is used to adjust the signal category of the device sampling signal sampled by the external signal sampler according to the on-off of the mode switching module.

[0012] By adopting the above technical solution, the male end of the connector obtains the sensor sampling signals received by the first temperature sensor and the second temperature sensor, wherein the first temperature sensor is used to obtain the brake temperature sensor signal of the first wheel of the aircraft, and the second temperature sensor is used to obtain the brake temperature sensor signal of the second wheel of the aircraft, and the power conversion module is used to convert the externally connected 220V / 50HZ signal source into a +28V DC signal suitable for the circuit (device) provided in this application; the mode switching module is used to switch the sampling signal type of the circuit, including normal mode and current monitoring mode, wherein the DC signal is input to the female end of the connector in the normal mode, in which case the circuit voltage can be monitored in real time by a multimeter (signal sampler); in the current monitoring mode, the DC signal is connected to the multimeter instead of the female end of the connector, in which case the current data can be recorded in real time. Further, in the normal mode, by detecting the circuit voltage in real time, the input voltage value corresponding to the brake temperature sensor corresponding to the input can be determined, thereby detecting the sensor. Based on this, the current detection and voltage detection are integrated to avoid the use of multiple tools for testing, thereby achieving the beneficial effect of improving the detection efficiency.

[0013] Optionally, the power conversion module includes a power converter;

[0014] The neutral terminal of the power converter is connected to the neutral terminal of the signal source, the phase terminal of the power converter is connected to the phase terminal of the signal source, and the ground terminal of the power converter is connected to the ground terminal of the signal source;

[0015] The ground terminal of the power converter is also connected to the negative voltage terminal of the power converter, and the negative voltage terminal of the power converter is also connected to the ground terminal of the mode switching module;

[0016] The positive voltage terminal of the power converter is connected to the DC input terminal of the mode switching module.

[0017] By adopting the above technical solution, the external 220V / 50HZ signal source is converted into a +28V DC signal suitable for the circuit provided in this application, without the need to re-purchase a DC power supply, while achieving the effect of simplifying the test setup requirements.

[0018] Optionally, the power conversion module further includes a first control switch;

[0019] One end of the first control switch is connected to the neutral line terminal and the phase line terminal of the signal source, and the other end is connected to the neutral line terminal and the phase line terminal of the power converter.

[0020] By adopting the above technical solution, a first control switch is provided between the signal source and the power converter to control the on and off of the circuit.

[0021] Optionally, the power conversion module further includes a first fuse;

[0022] One end of the first fuse is connected to the neutral line terminal of the signal source, and the other end is connected to the neutral line terminal of the power converter.

[0023] By adopting the above technical solution, a fuse is arranged between the signal source and the power converter, so that the fuse is burned out in the case of overvoltage, etc., thereby protecting the back-end circuit and extending the service life of the circuit.

[0024] Optionally, the mode switching module includes a conversion switch;

[0025] The first end of the conversion switch is connected to the positive voltage end of the power converter;

[0026] If the first end of the conversion switch is connected to the second end of the conversion switch, it is used to sample the current value of the sensor sampling signal;

[0027] If the first end of the conversion switch is connected to the second end of the conversion switch, it is used to sample the voltage value of the sensor sampling signal.

[0028] By adopting the above technical solution, a conversion switch is provided between the positive voltage terminal of the power converter and the female end of the connector. The conversion switch enters the current monitoring mode when the first end and the second end are closed. In this case, the DC signal is input into the signal sampler (multimeter) to obtain the real-time current value; the conversion switch enters the normal mode when the first end and the third end are closed. In this case, the DC signal is output to the connector bus through the conversion switch, and the multimeter can collect and obtain the voltage of the entire device.

[0029] Optionally, the mode switching module further includes a second control switch; the second control switch is connected in series between the power converter and the female end of the connector.

[0030] By adopting the above technical solution, a second control switch is provided between the power converter and the conversion switch, and the on-off of the entire circuit can be controlled by the on-off of the second control switch.

[0031] Optionally, the temperature sensor includes a first temperature sensor and a second temperature sensor;

[0032] The female end of the connector includes a first thermocouple simulator negative terminal, a first thermocouple simulator positive terminal, a second thermocouple simulator negative terminal, a second thermocouple simulator positive terminal, a DC power supply input terminal, a ground terminal, a first sensor output terminal, and a second sensor output terminal;

[0033] The DC power input terminal is connected to the third terminal of the conversion switch.

[0034] By adopting the above technical solution, when it is necessary to obtain the voltage value corresponding to the first temperature sensor, the external thermocouple simulator is connected to the negative terminal of the first thermocouple simulator and the positive terminal of the first thermocouple simulator, and the multimeter is connected to the ground terminal and the output terminal of the first sensor, so as to obtain the voltage value corresponding to the first temperature sensor; similarly, when it is necessary to obtain the voltage value corresponding to the second temperature sensor, the external thermocouple simulator is connected to the negative terminal of the second thermocouple simulator and the positive terminal of the second thermocouple simulator, and the multimeter is connected to the ground terminal and the output terminal of the second sensor, so as to obtain the voltage value corresponding to the second temperature sensor. Based on the above, it can be seen that the detection of the first and second temperature sensors is integrated in the same circuit, and the detection can be switched by adjusting the access port, thereby improving the detection efficiency.

[0035] Optionally, the male end of the connector includes a first aluminum wire end, a first nickel-chromium alloy end, a second aluminum wire end, a second nickel-chromium alloy end, a DC signal input end, an electrical ground end, a first output voltage end, and a second output voltage end.

[0036] A second aspect of the present application provides a brake temperature sensor monitoring unit testing device, which is equipped with the above-mentioned brake temperature sensor monitoring unit testing circuit.

[0037] In summary, the beneficial effects of the present application are as follows: the male end of the connector obtains the sensor sampling signals received by the first temperature sensor and the second temperature sensor, wherein the first temperature sensor is used to obtain the brake temperature sensor signal of the first wheel of the aircraft, and the second temperature sensor is used to obtain the brake temperature sensor signal of the second wheel of the aircraft, and the power conversion module is used to convert the externally connected 220V / 50HZ signal source into a +28V DC signal suitable for the circuit (device) provided by the present application; the mode switching module is used to switch the sampling signal type of the circuit, including the normal mode and the current monitoring mode, wherein the DC signal is input to the female end of the connector in the normal mode, in which case the circuit can be monitored in real time by a multimeter (signal sampler). Voltage; In current monitoring mode, connect the DC signal to the multimeter instead of the female end of the connector. In this case, the current data can be recorded in real time. Furthermore, when it is necessary to obtain the voltage value corresponding to the first temperature sensor, connect the external thermocouple simulator to the negative end of the first thermocouple simulator and the positive end of the first thermocouple simulator, connect the multimeter to the ground end and the output end of the first sensor, and the voltage value corresponding to the first temperature sensor can be obtained; similarly, when it is necessary to obtain the voltage value corresponding to the second temperature sensor, connect the external thermocouple simulator to the negative end of the second thermocouple simulator and the positive end of the second thermocouple simulator, connect the multimeter to the ground end and the output end of the second sensor, and the voltage value corresponding to the second temperature sensor can be obtained. Based on the above, it can be seen that the detection of the first and second temperature sensors is integrated in the same circuit, and the detection can be switched by adjusting the access port, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is the block diagram of a typical aircraft brake temperature monitoring system;

[0039] Figure 2 It is a module schematic diagram of a brake temperature sensor monitoring unit test circuit provided in an embodiment of the present application;

[0040] Figure 3 It is a circuit schematic diagram of a brake temperature sensor monitoring unit test circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following examples will help those skilled in the art to further understand the effects of the present application, but are not intended to limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several modifications and improvements may be made without departing from the concept of the present application. These all fall within the scope of protection of the present application.

[0042] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0043] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0044] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0045] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0046] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0047] The brake temperature monitoring system (taking Airbus320 as an example) has 4 temperature sensors, 2 brake temperature sensor monitoring units (BTMU) and a brake / turning control unit (BSCU). The BTMU component is installed on the aircraft landing gear axle. It can monitor and collect the temperature signal of the brake temperature sensor in real time and feed it back to the pilot through the computer. The pilot will make corresponding processing according to different signals to avoid aviation accidents.

[0048] With the development of civil aviation industry at home and abroad, the number and types of domestic aircraft have increased significantly. Aircraft have been operating in complex ground environment and high-altitude meteorological environment for a long time. In addition, various factors have led to a large amount of maintenance required for the brake temperature sensor monitoring unit (BTMU). The existing technical maintenance plan is mainly to send it to the original factory for maintenance or combined testing, which is inefficient. Based on this, this application proposes a circuit and device for detecting the brake temperature sensor monitoring unit. The following is a detailed description of this application in conjunction with the accompanying drawings.

[0049] Reference Figure 2 , which is a module schematic diagram of a brake temperature sensor monitoring unit test circuit provided in an embodiment of the present application, including a power conversion module 1, a mode switching module 2, and a connector module 3;

[0050] The connector module 3 includes a connector male end P11 and a connector female end J11, and the connector male end P11 is plug-in connected to the connector female end J11, and is used to send a sensor sampling signal sent by an external temperature sensor to the connector female end J11;

[0051] Specifically, the connector male end P11 obtains sensor sampling signals received by the first temperature sensor and the second temperature sensor, wherein the first temperature sensor is used to obtain the brake temperature sensor signal of the first wheel of the aircraft, and the second temperature sensor is used to obtain the brake temperature sensor signal of the second wheel of the aircraft.

[0052] The input end of the power conversion module 1 is connected to an external signal source, and the output end of the power conversion module 1 is connected to the input end of the mode switching module 2, for converting the AC signal output by the signal source into a DC signal corresponding to the test circuit;

[0053] Specifically, the power conversion module 1 is used to convert an externally connected 220V / 50HZ signal source into a +28V DC signal suitable for the circuit (device) provided in this application.

[0054] The output end of the mode switching module 2 is connected to the DC input end of the connector female end J11, and is used to adjust the signal category of the device sampling signal sampled by the external signal sampler according to the on-off of the mode switching module 2.

[0055] Specifically, the mode switching module 2 is used to switch the sampling signal type of the circuit, including the normal mode and the current monitoring mode. In the normal mode, the DC signal is input to the female connector J11, in which case the circuit voltage can be monitored in real time by the multimeter (signal sampler); in the current monitoring mode, the DC signal is connected to the multimeter instead of the female connector J11, in which case the current data can be recorded in real time. Optionally, in the normal mode, by detecting the circuit voltage in real time, the input voltage value corresponding to the brake temperature sensor corresponding to the input can be determined, thereby detecting the sensor.

[0056] More specifically, please refer to Figure 3 , Figure 3 The circuit schematic diagram of the brake temperature sensor monitoring unit test circuit provided in the embodiment of the present application is shown below in combination with Figure 3 Specific description for each module:

[0057] Regarding the power conversion module 1: the power conversion module 1 includes a power converter U1;

[0058] The neutral terminal of the power converter U1 is connected to the neutral terminal of the signal source, the phase terminal of the power converter U1 is connected to the phase terminal of the signal source, and the ground terminal of the power converter U1 is connected to the ground terminal of the signal source;

[0059] The ground terminal of the power converter U1 is also connected to the negative voltage terminal of the power converter U1, and the negative voltage terminal of the power converter U1 is also connected to the ground terminal of the mode switching module 2;

[0060] The positive voltage terminal of the power converter U1 is connected to the DC input terminal of the mode switching module 2 .

[0061] Specifically, through the power converter U1, the external 220V / 50HZ signal source is converted into a +28V DC signal suitable for the circuit provided in this application, without the need to re-purchase a DC power supply, while achieving the effect of simplifying the test setup requirements.

[0062] Optionally, the power conversion module 1 further includes a first control switch S1;

[0063] One end of the first control switch S1 is connected to the neutral line terminal and the phase line terminal of the signal source, and the other end is connected to the neutral line terminal and the phase line terminal of the power converter U1.

[0064] Specifically, a first control switch S1 is provided between the signal source and the power converter U1 to control the on and off of the circuit.

[0065] Optionally, the power conversion module 1 further includes a first fuse F1;

[0066] One end of the first fuse F1 is connected to the neutral line terminal of the signal source, and the other end is connected to the neutral line terminal of the power converter U1.

[0067] Specifically, a fuse is provided between the signal source and the power converter U1 to burn out in case of overvoltage or the like, thereby protecting the back-end circuit and extending the service life of the circuit.

[0068] Regarding the mode switching module 2: the mode switching module 2 includes a conversion switch S3;

[0069] A first end of the conversion switch S3 is connected to a positive voltage end of the power converter U1;

[0070] If the first end of the conversion switch S3 is connected to the second end of the conversion switch S3, it is used to sample the current value of the sensor sampling signal;

[0071] If the first end of the conversion switch S3 is connected to the second end of the conversion switch S3, it is used to sample the voltage value of the sensor sampling signal.

[0072] Specifically, a conversion switch S3 is provided between the positive voltage terminal of the power converter U1 and the connector female terminal J11. The conversion switch S3 enters a current monitoring mode when the first terminal and the second terminal are closed. In this case, a DC signal is input into a signal sampler (multimeter) to obtain a real-time current value. The conversion switch S3 enters a normal mode when the first terminal and the third terminal are closed. In this case, a DC signal is output to the connector bus through the conversion switch S3, and the multimeter can collect and obtain the voltage of the entire device.

[0073] Optionally, the mode switching module 2 further includes a second control switch S2; the second control switch S2 is connected in series between the power converter U1 and the connector female end J11.

[0074] Specifically, a second control switch S2 is provided between the power converter U1 and the conversion switch S3, and the on-off of the entire circuit can be controlled by the on-off of the second control switch S2.

[0075] About connector module 3: Connector module 3 includes connector male end P11 (plug) and connector female end J11 (socket).

[0076] Wherein, the connector female end J11 includes a first thermocouple simulator negative terminal J1, a first thermocouple simulator positive terminal, a second thermocouple simulator negative terminal, a second thermocouple simulator positive terminal, a DC power supply input terminal, a ground terminal, a first sensor output terminal and a second sensor output terminal;

[0077] The connector male end P11 includes a first aluminum wire end, a first nickel-chromium alloy end, a second aluminum wire end, a second nickel-chromium alloy end, a DC signal input end, an electrical ground end, a first output voltage end, and a second output voltage end.

[0078] Specifically, when it is necessary to obtain the voltage value corresponding to the first temperature sensor, connect the external thermocouple simulator to the negative terminal J1 of the first thermocouple simulator and the positive terminal of the first thermocouple simulator, connect the multimeter to the ground terminal and the output terminal of the first sensor, and the voltage value corresponding to the first temperature sensor can be obtained; similarly, when it is necessary to obtain the voltage value corresponding to the second temperature sensor, connect the external thermocouple simulator to the negative terminal of the second thermocouple simulator and the positive terminal of the second thermocouple simulator, connect the multimeter to the ground terminal and the output terminal of the second sensor, and the voltage value corresponding to the second temperature sensor can be obtained. Based on the above, it can be seen that the detection of the first and second temperature sensors is integrated in the same circuit, and the detection can be switched by adjusting the access port, thereby improving the detection efficiency.

[0079] In one embodiment proposed in the present application, the process of the brake temperature sensor monitoring unit includes:

[0080] First, the connector male terminal P11 needs to be tested for insulation. The specific operation of the insulation test is as follows:

[0081] Step S11: Connect the three plugs P1, P2 and P3 on the brake temperature monitoring unit (BTMU) to the connector male end P11, so that P1-1, P1-3, P1-5, P1-7, P1-9, P1-10, P1-11 and P1-12 are short-circuited;

[0082] Step S12: Set the digital megohmmeter to a preset position (in the embodiment provided in this application, the preset position is 50VDC position), directly measure the resistance between P1-12 and the shorting pin and record the value, thereby completing the insulation test. Among them, the shorting pin refers to connecting two or more specific pins on the circuit board so that they are electrically connected and communicated, which is used for testing and starting electronic devices or circuit boards.

[0083] Secondly, a connection test is required to determine whether the circuit is well connected through a multimeter. The specific operations are as follows:

[0084] Step S21: Connect the two ends of the multimeter to P1-12 and the brake temperature monitoring unit (BTMU) housing, directly measure the resistance and record the value to determine whether the connection between the circuit and the brake temperature monitoring unit (BTMU) is good.

[0085] Step S22: connect the two ends of the multimeter to P1-12 and the first temperature sensor connector housing, directly measure the resistance and record the value to determine whether the connection between the circuit and the first temperature sensor is good.

[0086] Step S23: Lap the two ends of the multimeter on P1-12 and the second temperature sensor connector housing, directly measure the resistance and record the value to determine whether the connection between the circuit and the second temperature sensor is good.

[0087] Thirdly, it is necessary to test the functions of the first temperature sensor and the second temperature sensor. The specific operations are as follows:

[0088] Step S31: Connect the test device (i.e., the brake temperature sensor monitoring unit test device provided by the present application, hereinafter referred to as the test device) to a 220V / 50HZ power supply via a power cord, and turn the first control switch S1 from the OFF position to the ON position to turn on the power of the test device;

[0089] Step S32: Turn the second control switch S2 from the OFF position to the ON position, and the test device starts to provide +28VDC power and power the test piece;

[0090] Step S33: Set the conversion switch S3 to the "NORMAL" position (i.e., the first end of the conversion switch S3 is connected to the third end thereof), and connect the multimeter to the "positive voltage detection point" and the "negative voltage detection point" to check the voltage value of the test device at the current moment;

[0091] Step S34: Set the conversion switch S3 to the "CURRENT" position (i.e., the first end of the conversion switch S3 is connected to its second end), and connect the multimeter to the "positive current detection point" and the "negative current detection point" to check the current of the test device at the current moment.

[0092] Step S35: After checking the voltage and current of the test device, close the first control switch S1 and the second control switch S2, connect the three plugs P1, P2 and P3 on the brake temperature monitoring unit (BTMU) to the connector male end P11, and insert the connector male end P11 into the connector female end J11 on the BTMU;

[0093] Step S36: measuring the first temperature sensor, connecting the thermocouple simulator to the first thermocouple simulator negative terminal J1 and the first thermocouple simulator positive terminal J2 of the test device, connecting the multimeter to the ground terminal J6 and the first sensor output terminal J7 of the test device, setting the thermocouple simulator to the required temperature value for the test, at this time, the first thermocouple simulator negative terminal J1 and the first thermocouple simulator positive terminal J2 receive the signal of the thermocouple simulator below the current temperature, and after conversion, the signal is output to the ground terminal J6 and the first sensor output terminal J7 through the brake temperature monitoring unit (BTMU), at this time, the voltage converted by the first temperature sensor can be directly read with a multimeter at the ground terminal J6 and the first sensor output terminal J7;

[0094] Among them, the thermocouple simulator is a device used to simulate the output signal of the thermocouple, and is mainly used to test and calibrate the thermocouple temperature measurement system.

[0095] Step S37: Measure the second temperature sensor. Connect the thermocouple simulator to the second thermocouple simulator negative terminal J3 and the second thermocouple simulator positive terminal J4 of the test device, connect the multimeter to the ground terminal J6 and the second sensor output terminal J8 of the test device, set the thermocouple simulator to the required temperature value for the test, and then the second thermocouple simulator negative terminal J3 and the second thermocouple simulator positive terminal J4 receive the signal of the thermocouple simulator below the current temperature, and after conversion, the signal is output to the ground terminal J6 and the second sensor output terminal J8 through the brake temperature monitoring unit (BTMU). At this time, the multimeter can be used to directly read the converted voltage of the second temperature sensor at the ground terminal J6 and the second sensor output terminal J8.

[0096] It can be seen from the above implementation steps that the test device provided by the present application is convenient and easy to use. After each test piece is tested, the next test piece can be directly carried out without rebuilding the test device, thereby improving the test efficiency.

[0097] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A brake temperature sensor monitoring unit test circuit, applied to an aircraft brake temperature sensor monitoring unit, characterized in that: The circuit includes a power conversion module, a mode switching module, and a connector module, wherein the connector module includes a connector male end and a connector female end; The connector male end is connected to the connector female end, and is used to send a sensor sampling signal sent by an external temperature sensor to the connector female end; The input end of the power conversion module is connected to an external signal source, and the output end of the power conversion module is connected to the input end of the mode switching module, for converting the AC signal output by the signal source into a DC signal corresponding to the test circuit; The output end of the mode switching module is connected to the DC input end of the female end of the connector, and is used to adjust the signal category of the device sampling signal sampled by the external signal sampler according to the on-off of the mode switching module.

2. The brake temperature sensor monitoring unit test circuit according to claim 1, characterized in that: The power conversion module includes a power converter; The neutral terminal of the power converter is connected to the neutral terminal of the signal source, the phase terminal of the power converter is connected to the phase terminal of the signal source, and the ground terminal of the power converter is connected to the ground terminal of the signal source; The ground terminal of the power converter is also connected to the negative voltage terminal of the power converter, and the negative voltage terminal of the power converter is also connected to the ground terminal of the mode switching module; The positive voltage terminal of the power converter is connected to the DC input terminal of the mode switching module.

3. The brake temperature sensor monitoring unit test circuit according to claim 2, characterized in that: The power conversion module also includes a first control switch; One end of the first control switch is connected to the neutral line terminal and the phase line terminal of the signal source, and the other end is connected to the neutral line terminal and the phase line terminal of the power converter.

4. The brake temperature sensor monitoring unit test circuit according to claim 2, characterized in that: The power conversion module also includes a first fuse; One end of the first fuse is connected to the neutral line terminal of the signal source, and the other end is connected to the neutral line terminal of the power converter.

5. The brake temperature sensor monitoring unit test circuit according to claim 2, characterized in that: The mode switching module includes a conversion switch; The first end of the conversion switch is connected to the positive voltage end of the power converter; If the first end of the conversion switch is connected to the second end of the conversion switch, it is used to sample the current value of the sensor sampling signal; If the first end of the conversion switch is connected to the second end of the conversion switch, it is used to sample the voltage value of the sensor sampling signal.

6. The brake temperature sensor monitoring unit test circuit according to claim 5, characterized in that: The mode switching module further includes a second control switch; the second control switch is connected in series between the power converter and the female end of the connector.

7. The brake temperature sensor monitoring unit test circuit according to claim 5, characterized in that: The temperature sensor comprises a first temperature sensor and a second temperature sensor; The female end of the connector includes a first thermocouple simulator negative terminal, a first thermocouple simulator positive terminal, a second thermocouple simulator negative terminal, a second thermocouple simulator positive terminal, a DC power supply input terminal, a ground terminal, a first sensor output terminal, and a second sensor output terminal; The DC power input terminal is connected to the third terminal of the conversion switch.

8. The brake temperature sensor monitoring unit test circuit according to claim 7, characterized in that: The connector male end includes a first aluminum wire end, a first nickel-chromium alloy end, a second aluminum wire end, a second nickel-chromium alloy end, a DC signal input end, an electrical ground end, a first output voltage end, and a second output voltage end.

9. A brake temperature sensor monitoring unit testing device, characterized in that: The device is equipped with a brake temperature sensor monitoring unit test circuit as described in any one of claims 1 to 8.

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