An aircraft brake system off-field detection device and detection method

Abstract

An aircraft brake system field detection device and detection method, the detection device includes detection device host, speed drive mechanism and instruction drive mechanism. Detection device host is respectively connected with speed drive mechanism and instruction drive mechanism communication, to control speed drive mechanism and instruction drive mechanism, and gather the rotation speed, displacement, pressure feedback data of the drive structure, compare with speed sensor and instruction sensor output data, complete the performance function detection of speed sensor and instruction sensor. Speed drive mechanism and instruction drive mechanism drive simultaneously, or use alone, two do not interfere with each other. Through speed drive mechanism for driving speed sensor and analog test working condition, provide the rotation speed required for testing and detecting for speed sensor. Instruction drive mechanism is used for driving instruction sensor and analog test working condition, provides the displacement required for testing and detecting for instruction sensor, improves work efficiency, provides favorable guarantee for adapting modernization military development.

Description

Technical Field

[0001] This invention relates to the field of aircraft braking systems, and specifically to a testing device and method for aircraft braking systems in the field. Background Technology

[0002] With the development and advancement of industrial technology, the field testing of aircraft braking systems has become a critical issue for ensuring flight safety. The aircraft braking system is one of the key systems of an aircraft, and its field testing has become an important problem that urgently needs to be solved.

[0003] The existing testing equipment consists of two main types: one primarily comprises a main unit and test cables. It mainly uses host computer software to perform functional testing of the brake control box and analog signal conversion to perform performance testing. The other type comprises a main unit and a drive unit. It uses host computer software and drive fixtures to perform performance and functional testing of brake system accessories. A servo motor drives the system to create a semi-physical testing environment, providing the necessary inputs for speed, displacement, voltage, current, and pressure. The host computer software collects data in real time to perform performance testing of the brake system accessories. Currently, both types of testing equipment can only perform single-item testing of brake system accessories. They cannot perform overall brake system performance testing or fault location, simultaneous testing of brake system accessories, or rapid and effective brake system compatibility testing. Furthermore, the existing testing equipment is bulky, unsuitable for field testing, and inefficient, failing to meet the requirements of modern military logistics support.

[0004] After searching, the paper "Research and Design of Aircraft Brake Anti-skid System Testing Device" is similar to this invention. Journal name: Electronic Technology, Volume 46(5). The paper can only realize the testing of the brake control box and use the output and input of analog signals to realize fault location. It cannot realize the system-level testing of the brake system and the simultaneous testing of the performance and function of brake accessory products. Summary of the Invention

[0005] To overcome the problems of low testing efficiency and lack of functionality in existing braking system field testing devices, this invention proposes a testing device and method for aircraft braking systems in the field.

[0006] The aircraft braking system field testing device proposed in this invention mainly consists of a testing device main unit, a speed drive mechanism, and a command drive mechanism. The main unit is communicatively connected to both the speed drive mechanism and the command drive mechanism to control them and collect feedback data on the rotational speed, displacement, and pressure of the drive structure. This data is then compared with the output data of the speed sensor and the command sensor to complete the performance and functional testing of the speed sensor and the command sensor. The speed drive mechanism and the command drive mechanism operate simultaneously. The speed drive mechanism drives the speed sensor and simulates test conditions, providing the speed required for testing and detection. The command drive mechanism drives the command sensor and simulates test conditions, providing the displacement required for testing and detection.

[0007] The speed drive mechanism includes a first motor mounting base, a first servo motor, a first product connector, a connector fixing pin, a first product mounting base, a first base plate, and a speed sensor. In this speed drive mechanism, the first product mounting base is used to mount the product and is fixed to the upper surface of one end of the first base plate. The speed sensor is fixedly mounted on the inner surface of the first product mounting base. The first servo motor is mounted on the upper surface of the other end of the first base plate via the first motor mounting base, and the speed sensor is coaxial with the first servo motor. A first product connector is mounted on the inner end face of the product; it is connected to the output shaft of the first servo motor via the first product connector.

[0008] The first product connector consists of a connecting plate and a connecting rod, and its shape is T-shaped. One end face of the connecting plate has a slot for connecting the product at its center; the other end face of the connecting plate has an axial connecting rod, and the cantilever end face of the connecting rod has a blind hole for fixing and connecting the output shaft of the first servo motor.

[0009] The command drive mechanism includes a second base plate, a second servo motor, a second motor mounting base, a displacement sensor, a displacement sensor connecting plate, a servo motor connector, a pressure sensor, a second product connector, a second product mounting base, and a command sensor. In this command drive mechanism, one end of the command sensor is mounted on the upper surface of the product mounting base, and its lower surface is fixed to the second base plate 7 by bolts. The second product connector is fixedly mounted on the end face of one end of the pressure sensor and contacts the end face of the command sensor. The second servo motor is mounted on the upper surface of one end of the second base plate via the second motor mounting base, located at the other end of the pressure sensor, and fixed to the other end face of the pressure sensor via the servo motor connector. The displacement sensor is located on the upper surface of the servo motor, and the displacement sensor connecting plate is located between the servo motor connector and the mating surface of the second servo motor, and is fixed to the end face of the second servo motor by screws.

[0010] The servo motor connector consists of a positioning plate and a connector, and its shape is cross-shaped. The diameter of the positioning plate is slightly larger than the outer diameter of the pressure sensor. The connectors are located on both ends of the positioning plate and are coaxial with the positioning plate. The length of the connector that mates with the end face of the second servo motor is slightly less than the length of the threaded hole on the end face of the second servo motor, and the length of the connector that mates with the end face of the pressure sensor is slightly less than the length of the threaded hole on the end face of the pressure sensor.

[0011] The second product connector also consists of a positioning plate and a connector, and its shape is T-shaped. The diameter of the positioning plate is slightly larger than the outer diameter of the pressure sensor. The connector is located on one end face of the positioning plate and is coaxial with the positioning plate. The length of the connector, which mates with the end face of the pressure sensor, is slightly less than the length of the threaded hole on the end face of the pressure sensor.

[0012] This invention proposes a method for field testing of the performance parameters of an aircraft braking system using a field testing device. The specific process is as follows:

[0013] Step 1, Preparations for checking the money:

[0014] I. Connecting brake system accessory products;

[0015] The braking system accessories include a speed sensor, a command sensor, a brake control valve, and a brake control box. The test cable in the speed sensor is connected to the main unit's connector via a test port. The test cable's product test ports are connected to the connectors for the speed sensor, command sensor, brake control valve, and brake control box, respectively.

[0016] II. Establish communication cables;

[0017] Step 2, power on;

[0018] Step 3, check the braking system:

[0019] The specific process for testing the braking system is as follows:

[0020] Ⅰ. The main unit of the detection device acquires the motor speed signal N received by the speed sensor, the displacement signal M received by the displacement sensor, and the pressure signal F received by the pressure sensor. The acquired signals are then transmitted to the speed sensor, command sensor, and brake control valve of the braking system, respectively.

[0021] The speed sensor of the braking system converts the obtained motor speed signal N into a voltage signal and transmits it to the brake control box; the command sensor converts a portion of the obtained displacement signal M into a voltage signal and transmits it to the brake control box, and converts another portion of the displacement signal M into a current signal and transmits it to the brake control box; the brake control valve converts a portion of the obtained pressure signal F into a voltage signal and transmits it to the brake control box, and converts another portion of the pressure signal F into a current signal and transmits it to the brake control box.

[0022] II. The main unit of the testing device acquires the performance parameters of the braking system:

[0023] The performance parameters of the braking system obtained include rotational speed data from the speed sensor, displacement data from the command sensor, pressure data from the brake control valve, and voltage and current data from the brake control box.

[0024] The main unit of the testing device obtains the performance parameters of the braking system through the brake control box.

[0025] III. Interpretation of test results:

[0026] The testing device's main unit acquires the performance parameters of the braking system and compares them with the design standards of the braking system. If the comparison results of the performance parameters of the braking system acquired by the testing device's main unit are within the parameter range of the design standards, the data is deemed qualified; otherwise, the data is deemed unqualified, and an unqualified fault code is reported.

[0027] Complete the braking system-level test.

[0028] This invention also proposes a method for field testing of brake accessory products using the aforementioned aircraft brake system field testing device. The field testing is for brake accessory products, including speed sensor testing, command sensor testing, brake control valve testing, and brake control box testing. All tests are performed simultaneously during the brake accessory product-level testing; the specific process is as follows:

[0029] Step 1, speed sensor detection:

[0030] Under the rotation of the servo motor, the speed sensor is driven to rotate through the motor drive joint and the product joint. At the same time, the speed sensor outputs a speed voltage signal U1, and this speed voltage signal U1 is output to the signal conditioning card through the test cable; after signal processing, a conditioned speed voltage signal U3 and a speed current signal U4 are output. Each signal is collected by the data acquisition card, including the speed voltage signal U1, the conditioned speed voltage signal U3, and the speed current signal U4, and the collected signals are transmitted to the host of the detection device, and compared with the design standard through the host of the detection device. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported.

[0031] Step 2, Command Sensor Detection:

[0032] Under the drive of the servo motor, the command sensor is moved through the product joint. At the same time, the displacement sensor and the pressure sensor in the command sensor drive device respectively collect and output displacement data M2 and pressure F2 data to the signal conditioning card; after conditioning the displacement data M2 and pressure F2 data by the signal conditioning card, voltage signal U2 and current signal I2 are obtained.

[0033] The obtained voltage signal U2 and current signal I2 are output to the host of the detection device through the command sensor in the command sensor drive device, and compared with the design standard through the host of the detection device. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported.

[0034] Step 3, Brake Control Valve Detection:

[0035] The host of the detection device outputs a voltage command to the power supply card through the controller and then to the brake control valve. According to the internal chip of the brake control valve, the brake pressure voltage signal U3 and the brake pressure current signal I3 of the brake control valve are output to the signal conditioning card. The brake pressure voltage signal U3 and the brake pressure current signal I3 are processed through signal processing to obtain a conditioned brake pressure voltage signal U4 and a brake pressure current signal U4. The conditioned brake pressure voltage signal U4 and the brake pressure current signal U4 are collected and output by the data acquisition card to the host of the detection device. The brake pressure voltage signal U4 and the brake pressure current signal U4 are compared with the design standard through the host of the detection device. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported.

[0036] Step 4, Brake Control Box Detection:

[0037] The main unit of the detection device outputs voltage commands to the power supply card via the controller, which in turn outputs them to the brake control box. The voltage signal U0 and current signal I0 from the internal chip of the brake control box are then output to the signal conditioning card. After signal processing, the control voltage signal U4 and control current signal I4 of the brake control box are obtained. The data acquisition card acquires and outputs the conditioned control voltage signal U4 and control current signal I4 to the main unit of the detection device.

[0038] The main unit of the detection device compares the control voltage signal U4 and the control current signal I4 with the design standard. If the comparison result is within the parameter range of the design standard, the data is deemed qualified; otherwise, the data is deemed unqualified, and an unqualified fault code is reported.

[0039] This completes the product-level testing of brake accessories.

[0040] The testing device proposed in this invention mainly consists of a portable testing device main unit, a speed drive mechanism, a command drive mechanism, and test cables. The main unit controls a servo motor to provide the required rotational speed and displacement to the speed and command sensors, and provides the required voltage and current to the brake control box and brake control valve via power cables. Therefore, the testing device can simultaneously perform product-level testing of brake system accessories, as well as system-level testing of the brake system. The main unit connects to the speed sensor, command sensor, brake control box, and brake control valve accessories via test cables, and can simultaneously test the performance and function of these four brake system accessories using host computer software. A communication cable connects to the aircraft brake system, enabling system-level testing of the aircraft brake system and facilitating fault location through system-level checks.

[0041] The testing methods include: brake system-level testing and accessory product-level testing. A system-level physical environment for the brake system is established to quickly and effectively assess its performance and functionality, while simultaneously locating faults. Accessory product-level testing enables rapid and effective maintenance of the brake system. Accessory product-level testing utilizes command-driven and speed-driven mechanisms to simulate the physical conditions of command and speed sensors, and establishes testing functions for the brake control valve and brake control box through host computer software and communication protocols. Accessory product-level testing can be performed simultaneously, with data acquisition and analysis conducted without interference, improving work efficiency and providing a favorable guarantee for adapting to modern military development. Attached Figure Description

[0042] Figure 1 This is a block diagram of the detection device.

[0043] Figure 2a This is the main view of the speed drive mechanism.

[0044] Figure 2b This is a top view of the speed drive mechanism.

[0045] Figure 3a This is the main view of the instruction-driven mechanism.

[0046] Figure 3b This is a top view of the instruction-driven mechanism.

[0047] Figure 4 This is the drawing of the connector parts for the first product; among them, Figure 4 'a' is the main view. Figure 4 b is the left view.

[0048] Figure 5 This is a drawing of a servo motor connector part.

[0049] Figure 6 This is a drawing of the connector part for the second product.

[0050] In the diagram: 1 First motor mounting base; 2 First servo motor; 3 First product connector; 4 Connector fixing pin; 5 First product mounting base; 6 First base plate; 7 Speed ​​sensor; 8 Second base plate; 9 Second servo motor; 10 Second motor mounting base; 11 Displacement sensor; 12 Displacement sensor connecting plate; 13 Servo motor connector; 14 Pressure sensor; 15 Second product connector; 16 Second product mounting base; 17 Command sensor. Detailed Implementation

[0051] This embodiment is a testing device for aircraft braking systems in the field, mainly composed of a testing device main unit, a speed drive mechanism, and a command drive mechanism.

[0052] The main unit of the testing device adopts existing technology and consists of a controller, a data acquisition card, a signal conditioning card, a power supply card, test cables, and communication cables.

[0053] The speed drive mechanism includes a first motor mounting base 1, a first servo motor 2, a first product connector 3, a connector fixing pin 4, a first product mounting base 5, a first base plate 6, and a speed sensor 7.

[0054] The command drive mechanism includes a second base plate 8, a second servo motor 9, a second motor mounting base 10, a displacement sensor 11, a displacement sensor connecting plate 12, a servo motor connector 13, a pressure sensor 14, a second product connector 15, a second product mounting base 16, and a command sensor 17.

[0055] In the speed drive mechanism, a first product mounting base 5 is fixed to the upper surface of one end of a first base plate 6, and the product is mounted on the first product mounting base. A speed sensor 7 is fixedly mounted on the inner surface of the first product mounting base 5. A first servo motor 2 is mounted on the upper surface of the other end of the first base plate 6 via a first motor mounting base 1, and the speed sensor 7 is coaxial with the first servo motor. A first product connector 3 is mounted on the inner end face of the product; it is connected to the output shaft of the first servo motor 2 through the first product connector 3.

[0056] The first product connector 3 consists of a connecting plate and a connecting rod, and its shape is T-shaped. One end face of the connecting plate has teeth at its center for connecting the product (an external gear). The connecting plate uses two symmetrical teeth to mesh with the external gear of the product, reducing mutual friction while ensuring balanced transmission torque. The other end face of the connecting plate has an axial connecting rod, and the cantilever end face of this connecting rod has a blind hole for fixing the output shaft of the first servo motor 2. The first servo motor is axially positioned through a stepped hole on the blind hole end face.

[0057] In the command drive mechanism, one end of the command sensor 17 is mounted on the upper surface of the product mounting base 14, and its lower surface is fixed to the second base plate 7 by bolts. The second product connector 15 is fixedly mounted on the end face of one end of the pressure sensor 14 and contacts the end face of the command sensor. The second servo motor 9 is mounted on the upper surface of one end of the second base plate 8 via the second motor mounting base 10, and is located at the other end of the pressure sensor 14, and is fixed to the other end face of the pressure sensor 14 via the servo motor connector 13. The displacement sensor 10 is located on the upper surface of the servo motor 9, and its displacement sensor connecting plate 12 is located between the servo motor connector 13 and the mating surface of the second servo motor 9, and is fixed to the end face of the second servo motor 9 by screws. The second servo motor 9, pressure sensor 14, and displacement sensor 11 all employ existing technology.

[0058] The servo motor connector 13 consists of a positioning plate and a connector, and its shape is cross-shaped. The diameter of the positioning plate is slightly larger than the outer diameter of the pressure sensor 14. The connectors are located on the end faces of the positioning plate and are coaxial with the positioning plate. The length of the connector that mates with the end face of the second servo motor is slightly less than the length of the threaded hole on the end face of the second servo motor, and the length of the connector that mates with the end face of the pressure sensor 14 is slightly less than the length of the threaded hole on the end face of the pressure sensor 14.

[0059] The second product connector 15 also consists of a positioning plate and a connector, and its shape is T-shaped. The diameter of the positioning plate is slightly larger than the outer diameter of the pressure sensor 14. The connector is located on one end face of the positioning plate and is coaxial with the positioning plate. The length of the connector that mates with the end face of the pressure sensor 14 is slightly smaller than the length of the threaded hole on the end face of the pressure sensor 14.

[0060] The specific process for field testing of an aircraft braking system proposed in this embodiment is as follows:

[0061] Step 1, Brake system level inspection:

[0062] 1. Connecting brake system accessory products:

[0063] The brake system accessory products include a speed sensor, a command sensor, a brake control valve, and a brake control box. The test cable in the speed sensor is connected to the main unit's connector via a test port. The test cable's product test ports are connected to the connectors for the speed sensor, command sensor, brake control valve, and brake control box, respectively.

[0064] 2. Establish communication cables:

[0065] The communication port of the main unit of the communication cable in the brake control box is connected to the aviation connector of the main unit of the detection device, and the product communication port of the communication cable is connected to the communication aviation connector of the brake control box.

[0066] Step 2, Power on:

[0067] Connect the external power supply, turn on the testing device switch, and open the host computer software to prepare for testing. According to the technical requirements, the controller of the testing device outputs control commands, including voltage, current, speed, pressure, and displacement signals, which are then supplied to the brake system accessories by the power supply card.

[0068] Step 3, check the braking system:

[0069] The specific process for testing the braking system is as follows:

[0070] The first step involves acquiring the motor speed signal N received by the speed sensor, the displacement signal M received by the displacement sensor, and the pressure signal F received by the pressure sensor through the main unit of the detection device. These acquired signals are then transmitted to the speed sensor, command sensor, and brake control valve of the braking system, respectively.

[0071] The speed sensor of the braking system converts the obtained motor speed signal N into a voltage signal and transmits it to the brake control box; the command sensor converts a portion of the obtained displacement signal M into a voltage signal and transmits it to the brake control box, and converts another portion of the displacement signal M into a current signal and transmits it to the brake control box; the brake control valve converts a portion of the obtained pressure signal F into a voltage signal and transmits it to the brake control box, and converts another portion of the pressure signal F into a current signal and transmits it to the brake control box.

[0072] The second step involves the main unit of the testing device acquiring the performance parameters of the braking system.

[0073] The performance parameters of the braking system obtained include rotational speed data from the speed sensor, displacement data from the command sensor, pressure data from the brake control valve, and voltage and current data from the brake control box.

[0074] The main unit of the testing device obtains the performance parameters of the braking system through the brake control box.

[0075] The third step is to determine the test results:

[0076] The testing device's main unit acquires the performance parameters of the braking system and compares them with the design standards of the braking system. If the comparison results of the performance parameters of the braking system acquired by the testing device's main unit are within the parameter range of the design standards, the data is deemed qualified; otherwise, the data is deemed unqualified, and an unqualified fault code is reported.

[0077] Complete the braking system-level test.

[0078] Step 4, Product-level Testing of Brake Accessories:

[0079] The product-level testing of brake accessories includes speed sensor testing, command sensor testing, brake control valve testing, and brake control box testing. This product-level testing of brake accessories is performed simultaneously. The specific method is as follows:

[0080] Speed ​​sensor detection:

[0081] The host of the detection device outputs a speed command to the power supply card through the controller to control the servo driver. The servo motor receives the speed command output by the servo driver and provides a rotational speed according to the speed command. Under the rotation of the servo motor, the speed sensor is driven to rotate through the motor drive joint and the product joint. At the same time, the speed sensor outputs a speed voltage signal U1, and this speed voltage signal U1 is output to the signal conditioning card through the test cable; after signal processing, a conditioned speed voltage signal U3 and a speed current signal U4 are output. Each signal, including the speed voltage signal U1, the conditioned speed voltage signal U3, and the speed current signal U4, is collected by the data acquisition card, and the collected signals are transmitted to the host of the detection device, and compared with the design standard through the host of the detection device. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported.

[0082] Instruction sensor detection:

[0083] The host of the detection device outputs an instruction to the power supply card through the controller to control the servo driver. The servo motor receives the control instruction of the servo driver and provides a displacement signal according to the instruction. Under the drive of the servo motor, the instruction sensor is driven to move through the product joint. At the same time, the displacement sensor and the pressure sensor in the instruction sensor drive device respectively collect and output displacement data M2 and pressure F2 data to the signal conditioning card; after the displacement data M2 and pressure F2 data are conditioned by the signal conditioning card, voltage signal U2 and current signal I2 are obtained.

[0084] The obtained voltage signal U2 and current signal I2 are output to the host of the detection device through the instruction sensor in the instruction sensor drive device, and compared with the design standard through the host of the detection device. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported.

[0085] Brake control valve detection:

[0086] The host of the detection device outputs a voltage command through the controller to the power supply card and then to the brake control valve. According to the internal chip of the brake control valve, the brake pressure voltage signal U3 and the brake pressure current signal I3 of the brake control valve are output to the signal conditioning card. The brake pressure voltage signal U3 and the brake pressure current signal I3 are processed to obtain the conditioned brake pressure voltage signal U4 and the brake pressure current signal U4. The conditioned brake pressure voltage signal U4 and the brake pressure current signal U4 are collected and output through the data acquisition card to the host of the detection device. The host of the detection device compares the brake pressure voltage signal U4 and the brake pressure current signal U4 with the design standard. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified and the unqualified fault code is reported.

[0087] Brake control box detection:

[0088] The host of the detection device outputs a voltage command through the controller to the power supply card and then to the brake control box, and outputs the voltage signal U0 and the current signal I0 output by the internal chip of the brake control box to the signal conditioning card. Through signal processing, the control voltage signal U4 and the control current signal I4 of the brake control box are obtained. The conditioned control voltage signal U4 and the control current signal I4 are collected and output through the data acquisition card to the host of the detection device.

[0089] The host of the detection device compares the control voltage signal U4 and the control current signal I4 with the design standard. If the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified and the unqualified fault code is reported.

[0090] So far, the detection of the brake accessory product level is completed.

Claims

1. An apparatus for detecting an aircraft brake system in the field, comprising: The application relates to a speed sensor and instruction sensor performance function detection device which mainly comprises a detection device host, a speed driving mechanism and an instruction driving mechanism; the detection device host is in communication connection with the speed driving mechanism and the instruction driving mechanism to control the speed driving mechanism and the instruction driving mechanism, collect rotation speed, displacement and pressure feedback data of the speed driving mechanism and the instruction driving mechanism, compare the data with output data of a speed sensor and an instruction sensor, and complete performance function detection of the speed sensor and the instruction sensor; the speed driving mechanism and the instruction driving mechanism are simultaneously driven; the speed driving mechanism is used for driving the speed sensor and simulating test working conditions, and provides required rotation speed for the speed sensor; the instruction driving mechanism is used for driving the instruction sensor and simulating test working conditions, and provides required displacement for the instruction sensor. The speed driving mechanism comprises a first motor mounting base (1), a first servo motor (2), a first product connector (3), a first product mounting base (5), a first bottom plate (6) and a speed sensor (7); in the speed driving mechanism, the first product mounting base is used for mounting a product and is fixed to the upper surface of one end of the first bottom plate; the speed sensor is fixedly mounted to the inner side surface of the first product mounting base; the first servo motor is mounted to the upper surface of the other end of the first bottom plate through the first motor mounting base (1) and coaxial with the speed sensor (7); the first product connector (3) is mounted to the inner end surface of the product; the first product connector is connected with the output shaft of the first servo motor (2). The instruction driving mechanism comprises a second bottom plate (8), a second servo motor (9), a second motor mounting base (10), a displacement sensor (11), a displacement sensor connecting plate (12), a servo motor connector (13), a pressure sensor (14), a second product connector (15), a second product mounting base (16) and an instruction sensor (17); in the instruction driving mechanism, one end of the instruction sensor (17) is mounted to the upper surface of the second product mounting base, the lower surface is fixedly connected with the second bottom plate (8) through bolts; the second product connector (15) is fixedly mounted to the end surface of one end of the pressure sensor (14) and is in contact with the end surface of the instruction sensor; the second servo motor (9) is mounted to the upper surface of one end of the second bottom plate (8) through the second motor mounting base (10) and is located at the other end of the pressure sensor, and is fixedly connected with the other end surface of the pressure sensor (14) through the servo motor connector (13); the displacement sensor is located on the upper surface of the servo motor, the displacement sensor connecting plate (12) of the displacement sensor is located between the matching surface of the servo motor connector and the second servo motor, and is fixed to the end surface of the second servo motor through screws.

2. The apparatus for detecting the brake system of an aircraft in the field as claimed in claim 1, wherein The first product connector (3) is composed of a connecting plate and a connecting rod and has a T-shaped appearance; the connecting plate has a clamping groove for connecting a product at the center of one end surface; the connecting plate has an axial connecting rod at the end surface of the other end, and the connecting rod has a blind hole for fixedly connecting the output shaft of the first servo motor (2) at the end surface of the cantilever end.

3. The field testing device for aircraft braking systems as described in claim 1, characterized in that, The servo motor joint (13) is composed of a positioning disc and a connecting head, and the shape thereof is cross-shaped; the diameter of the positioning disc is slightly larger than the outer diameter of the pressure sensor (14); the connecting head is located at the end face of the positioning disc, and the connecting head is coaxial with the positioning disc; the length of the connecting head at the end face matched with the second servo motor is slightly smaller than the length of the threaded hole of the end face of the second servo motor, and the length of the connecting head at the end face matched with the pressure sensor (14) is slightly smaller than the length of the threaded hole of the end face of the pressure sensor (14).

4. The field testing device for aircraft braking systems as described in claim 1, characterized in that, The second product joint (15) is also composed of a positioning disc and a connecting head, and the shape thereof is T-shaped; the diameter of the positioning disc is slightly larger than the outer diameter of the pressure sensor (14); the connecting head is located at the end face of the positioning disc, and the connecting head is coaxial with the positioning disc; the length of the connecting head at the end face matched with the pressure sensor is slightly smaller than the length of the threaded hole of the end face of the pressure sensor.

5. A method for field detection using the field detection device of claim 1, wherein, The detection item of the external field detection is the performance parameter of the brake system; the specific process is as follows: Step 1, preparation work before detection: I. connect the brake system accessory products; II. establish a communication cable; Step 2, power on; Step 3, detect the brake system: The specific process of detecting the brake system is as follows: I. the detection device host obtains the motor speed signal N received by the speed sensor, the displacement signal M received by the displacement sensor and the pressure signal F received by the pressure sensor; the obtained signals are respectively transmitted to the speed sensor, the command sensor and the brake control valve of the brake system; II. the detection device host obtains the performance parameters of the brake system: The obtained performance parameters of the brake system include the speed data of the speed sensor, the displacement data of the command sensor, the pressure data of the brake control valve and the voltage data and current data of the brake control box; The detection device host obtains the performance parameters of the brake system through the brake control box; III. determination of the detection result: The performance parameters of the brake system obtained by the detection device host are compared with the design standard of the brake system; if the comparison result of the performance parameters of the brake system obtained by the detection device host and the design standard is within the parameter range of the design standard, it is determined that the data is qualified; otherwise, it is determined that the data is unqualified, and the unqualified fault code is reported; the brake system level detection is completed.

6. The method of claim 5, wherein the method comprises: The brake system accessory products include a speed sensor, a command sensor, a brake control valve and a brake control box; the host detection port of a test cable is connected with the USB socket of the detection device host, and the product detection port of the test cable is connected with the USB socket of the speed sensor, the USB socket of the command sensor, the USB socket of the brake control valve and the USB socket of the brake control box.

7. The method of claim 5, wherein the method comprises: The speed sensor of the brake system converts the obtained motor speed signal N into a voltage signal and transmits it to the brake control box; the command sensor converts part of the displacement signal M obtained into a voltage signal and transmits it to the brake control box, and converts another part of the displacement signal M into a current signal and transmits it to the brake control box; the brake control valve converts part of the pressure signal F obtained into a voltage signal and transmits it to the brake control box, and converts another part of the pressure signal F into a current signal and transmits it to the brake control box.

8. A method for field detection using the field detection device of claim 1, wherein, The external field detection is a product level detection of brake accessories, including speed sensor detection, command sensor detection, brake control valve detection and brake control box; the product level detection of brake accessories is carried out simultaneously; the specific process is: Step 1, speed sensor detection: The speed sensor is driven to rotate by the servo motor through the motor drive connector and the product connector, at the same time, the speed sensor outputs a speed voltage signal U1, which is output to the signal conditioning card through the test cable; after signal processing, the speed voltage signal U3 and the speed current signal U4 after conditioning are output; through the data acquisition card, each signal including the speed voltage signal U1, the speed voltage signal U3 after conditioning and the speed current signal U4 is collected, and each signal collected is transmitted to the host of the detection device, which is compared with the design standard through the detection device host; if the comparison result is within the parameter range of the design standard, it is determined that the data is qualified; otherwise, it is determined that the data is unqualified, and the unqualified fault code is reported; Step 2, command sensor detection: The command sensor is driven to move by the servo motor through the product connector; at the same time, the displacement sensor and the pressure sensor in the command sensor driving device respectively collect and output displacement data M2 and pressure F2 data to the signal conditioning card; after conditioning of the displacement data M2 and the pressure F2 data by the signal conditioning card, voltage signal U2 and current signal I2 are obtained; The obtained voltage signal U2 and current signal I2 are output to the detection device host through the command sensor in the command sensor driving device, which is compared with the design standard through the detection device host; if the comparison result is within the parameter range of the design standard, it is determined that the data is qualified; otherwise, it is determined that the data is unqualified, and the unqualified fault code is reported; Step 3, brake control valve detection: The detection device host outputs voltage instruction to the power supply card to the brake control valve through the controller, and outputs brake pressure voltage signal U3 and brake pressure current signal I3 of the brake control valve to the signal conditioning card according to the internal chip of the brake control valve; the brake pressure voltage signal U3 and the brake pressure current signal I3 are processed to obtain conditioned brake pressure voltage signal U4 and brake pressure current signal U4; the conditioned brake pressure voltage signal U4 and the brake pressure current signal U4 are collected and output to the host of the detection device through the data acquisition card; the brake pressure voltage signal U4 and the brake pressure current signal I4 are compared with the design standard by the host of the detection device; if the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported; Step 4, brake control box detection: The detection device host outputs voltage instruction to the power supply card to the brake control box, and outputs voltage signal U0 and current signal I0 output by the internal chip of the brake control box to the signal conditioning card; after signal processing, control voltage signal U4 and control current signal I4 of the brake control box are obtained; the conditioned control voltage signal U4 and control current signal I4 are collected and output to the host of the detection device through the data acquisition card; The control voltage signal U4 and the control current signal I4 are compared with the design standard by the host of the detection device; if the comparison result is within the parameter range of the design standard, the data is determined to be qualified; otherwise, the data is determined to be unqualified, and an unqualified fault code is reported; Thus, the detection of the brake accessory product level is completed.

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