Engine accessory test bench

Abstract

The utility model relates to the technical field of aerospace equipment detection and debugging, in particular to an engine accessory test board. Comprising a relay board card, a switching power supply module, a direct current signal input module, a discrete magnitude signal input module and an acquisition module, the test instruction generates an analog quantity signal and a discrete quantity signal; an acquisition module is arranged to obtain electric signals of engine accessories; by arranging a relay board card, a test result is generated according to an analog quantity signal, a discrete quantity signal and an electric signal; a touch display module is arranged to display a test result in real time; a working mode of combining manual operation and automatic operation is adopted, a touch screen all-in-one machine is adopted, and special testing software is adopted, so that a 28VDC direct current power supply required when a tested piece is tested can be provided, various analog signal inputs can be provided, various discrete magnitude signal inputs can be provided, discrete magnitude output testing loads can be provided, and various discrete magnitude output voltages can be monitored in real time; and the engine accessories are subjected to integrated test, so that the test precision and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of aerospace equipment testing and debugging technology, specifically to an engine accessory test bench. Background Technology

[0002] Engine flight testing is a flight test conducted in a real flight environment to verify the performance characteristics, operational quality, and reliability of the engine and its various systems and accessories when installed on an aircraft, or to achieve a predetermined research objective. Current testing of aircraft engine accessories simply involves wiring to sockets and connecting various external signals; there is no complete set of testing equipment. Utility Model Content

[0003] This invention addresses the problem that existing testing methods for aero-engine accessories simply involve wiring to a socket without a complete testing system. It proposes an engine accessory test bench, comprising a relay board, a switching power supply module, a DC signal input module, a discrete signal input module, and a data acquisition module. The bench acquires a 220VAC power signal based on a switching signal from a 220VAC power interface; generates analog and discrete signals based on test commands from a host computer; acquires electrical signals from the engine accessories using the data acquisition module; generates test results based on the analog, discrete, and electrical signals using the relay board; and displays the test results in real time using a touch screen module. This integrated testing of engine accessories improves testing accuracy and efficiency.

[0004] The specific implementation details of this utility model are as follows:

[0005] An engine accessory test bench, connected to engine accessories; includes a front panel and a chassis; the front panel is equipped with a touch display module and a 220VAC power interface; the chassis is equipped with a control board;

[0006] The control board includes a relay board, a switching power supply module, a DC signal input module, a discrete signal input module, and a data acquisition module.

[0007] The input terminal of the switching power supply module is connected to the 220VAC power interface, and the output terminal of the switching power supply module is connected to the input terminal of the relay board.

[0008] The input terminal of the relay board is connected to the output terminal of the DC signal input module, the output terminal of the discrete signal input module, and the output terminal of the touch display module; the output terminal of the relay board is connected to the input terminal of the acquisition module.

[0009] The data acquisition module is connected to the engine accessory;

[0010] The switching power supply module is used to obtain a 220VAC power signal based on the switching signal obtained from the 220VAC power interface;

[0011] The DC signal input module is used to generate analog signals according to the test instructions obtained from the host computer;

[0012] The discrete signal input module is used to generate discrete signals according to the test instructions obtained from the host computer.

[0013] The acquisition module is used to acquire electrical signals from engine accessories;

[0014] The relay board is used to generate test results based on analog signals, discrete signals, and electrical signals.

[0015] The touch display module is used to display test results in real time.

[0016] To better realize this utility model, the switching power supply module further includes a 220VAC socket XS1, a switch S1, a relay G1, a relay G2, a relay G3, and a motor M1;

[0017] The input terminal of the 220VAC socket XS1 receives a 220VAC power signal, and the output terminal is connected to the switch S1.

[0018] The input terminal of the relay G1 is connected to the output terminal of the switch S1 and the motor M1, and the output terminal of the relay G1 outputs 28VDC.

[0019] The input terminal of the relay G2 is connected to the output terminal of the switch S1 and the motor M1, and the output terminal of the relay G2 outputs 18VDC.

[0020] The input terminal of relay G3 is connected to the output terminal of switch S1 and motor M1, and the output terminal of relay G2 outputs 24VDC and 5VDC.

[0021] To better realize this utility model, the switching power supply module further includes a DC-DC boost module; the DC-DC boost module includes a relay G4;

[0022] The input terminal of relay G4 is connected to the 24VDC output terminal of relay G3, and the input terminal of relay G4 outputs 120VDC, 90VDC, and 60VDC.

[0023] To better realize this utility model, the control board further includes a resistance measurement module;

[0024] The resistance measurement module includes a resistance measurement interface JP6, an ohmmeter PR1, and an ohmmeter PR2;

[0025] The input terminal of the resistance measurement interface JP6 is connected to the engine accessory, and the output terminal of the resistance measurement interface JP6 is connected to the input terminals of ohmmeter PR1 and ohmmeter PR2.

[0026] The input terminal of the ohmmeter PR1 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the ohmmeter PR1 is connected to the relay board via an RS485 bus.

[0027] The input terminal of the ohmmeter PR2 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the ohmmeter PR2 is connected to the relay board via an RS485 bus.

[0028] To better realize this utility model, the DC signal input module further includes a first analog input module, a second analog input module, a socket XS2, a frequency counter U1, and an amplifier U30;

[0029] The input terminal of the first analog input module is connected to the 24VDC output terminal and the 18VDC output terminal of the relay G3. The output terminal of the first analog input module is connected to the socket XS2 and connected to the relay board via the RS485 bus.

[0030] The input terminal of the second analog input module is connected to the 24VDC output terminal of the relay G3 and the host computer, and the output terminal of the second analog input module is connected to the socket XS2.

[0031] The input terminal of the frequency meter U1 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the frequency meter U1 is connected to the socket XS2 through the amplifier U30.

[0032] To better realize this utility model, the discrete signal input module further includes a discrete switch module.

[0033] JP5 socket, JS5 socket;

[0034] The input terminal of the discrete signal input module is connected to the 24VDC output terminal of the relay G3, and the output terminal of the discrete signal input module is connected to the discrete switch module, socket JP5, socket JS5, and socket XS2.

[0035] To better realize this utility model, the acquisition module further includes a latch and an electrical connector;

[0036] The input terminal of the latch is connected to the engine accessories and relay board, and the output terminal of the latch is connected to the input terminal of the electrical connector.

[0037] The input end of the electrical connector is connected to the 24VDC output end of the relay G3, and the output end of the electrical connector is connected to the relay board.

[0038] This utility model has the following beneficial effects:

[0039] This utility model adopts a combination of manual and automatic working modes, uses a touch screen all-in-one machine, and through dedicated testing software, can provide the 28VDC power supply required for the test device, provide various analog signal inputs, provide various discrete signal inputs, provide discrete output test loads, and can monitor the output voltage of each discrete quantity in real time. Attached Figure Description

[0040] Figure 1 A schematic diagram of the front panel structure of the engine accessory test bench provided by this utility model.

[0041] Figure 2 A schematic block diagram of the engine accessory test bench provided by this utility model.

[0042] Figure 3 This is a schematic diagram of the first part of the power supply circuit provided by this utility model.

[0043] Figure 4 This is a schematic diagram of the second part of the power supply circuit provided by this utility model.

[0044] Figure 5 This is a schematic diagram of the third part of the power supply circuit provided by this utility model.

[0045] Figure 6 This is a schematic diagram of the fourth part of the power supply circuit provided by this utility model.

[0046] Figure 7 This is a schematic diagram of the fifth part of the power supply circuit provided by this utility model.

[0047] Figure 8 This is a schematic diagram of the first part of the DC signal printed circuit board provided by this utility model.

[0048] Figure 9 This is a schematic diagram of the second part of the DC signal printed circuit board provided by this utility model.

[0049] Figure 10 This is a schematic diagram of the third part of the DC signal printed circuit board provided by this utility model.

[0050] Figure 11 This is a schematic diagram of the fourth part of the DC signal printed circuit board provided by this utility model.

[0051] Figure 12This is a schematic diagram of the fifth part of the DC signal printed circuit board provided by this utility model.

[0052] Figure 13 This is a schematic diagram of the sixth part of the DC signal printed circuit board provided by this utility model.

[0053] Figure 14 This is a schematic diagram of the first part of the discrete signal printed circuit board provided by this utility model.

[0054] Figure 15 This is a schematic diagram of the second part of the discrete signal printed circuit board provided by this utility model.

[0055] Figure 16 This is a schematic diagram of the third part of the discrete signal printed circuit board provided by this utility model.

[0056] Figure 17 This is a schematic diagram of the fourth part of the discrete signal printed circuit board provided by this utility model.

[0057] Figure 18 This is a schematic diagram of the fifth part of the discrete signal printed circuit board provided by this utility model.

[0058] Figure 19 This is a schematic diagram of the sixth part of the discrete signal printed circuit board provided by this utility model.

[0059] Figure 20 This is a schematic diagram of the first part of the discrete signal circuit provided by this utility model.

[0060] Figure 21 This is a schematic diagram of the second part of the discrete signal circuit provided by this utility model.

[0061] Figure 22 This is a schematic diagram of the third part of the discrete signal circuit provided by this utility model.

[0062] Figure 23 This is a schematic diagram of the fourth part of the discrete signal circuit provided by this utility model.

[0063] Figure 24 A cable diagram provided for this utility model. Detailed Implementation

[0064] To more clearly illustrate the technical solutions of the embodiments of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of this utility model, not all embodiments, and therefore should not be regarded as a limitation on the scope of protection. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0065] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0066] Example 1:

[0067] This embodiment proposes an engine accessory test bench, which is connected to engine accessories; it includes a front panel and a chassis; the front panel is provided with a touch display module and a 220VAC power interface; the chassis is provided with a control board;

[0068] The control board includes a relay board, a switching power supply module, a DC signal input module, a discrete signal input module, and a data acquisition module.

[0069] The input terminal of the switching power supply module is connected to the 220VAC power interface, and the output terminal of the switching power supply module is connected to the input terminal of the relay board.

[0070] The input terminal of the relay board is connected to the output terminal of the DC signal input module, the output terminal of the discrete signal input module, and the output terminal of the touch display module; the output terminal of the relay board is connected to the input terminal of the acquisition module.

[0071] The data acquisition module is connected to the engine accessory;

[0072] The switching power supply module is used to obtain a 220VAC power signal based on the switching signal obtained from the 220VAC power interface;

[0073] The DC signal input module is used to generate analog signals according to the test instructions obtained from the host computer;

[0074] The discrete signal input module is used to generate discrete signals according to the test instructions obtained from the host computer.

[0075] The acquisition module is used to acquire electrical signals from engine accessories;

[0076] The relay board is used to generate test results based on analog signals, discrete signals, and electrical signals.

[0077] The touch display module is used to display test results in real time.

[0078] Working principle: This embodiment adopts a combination of manual and automatic working modes. It uses a touch screen all-in-one machine and dedicated testing software to provide the 28VDC power supply required for the test device, provide various analog signal inputs, provide various discrete signal inputs, provide discrete output test loads, and monitor the output voltage of each discrete quantity in real time.

[0079] Example 2:

[0080] This embodiment is based on the above embodiment 1, such as... Figure 3 As shown, the switching power supply module includes a 220VAC socket XS1, a switch S1, a relay G1, a relay G2, a relay G3, and a motor M1;

[0081] The input terminal of the 220VAC socket XS1 receives a 220VAC power signal, and the output terminal is connected to the switch S1.

[0082] The input terminal of the relay G1 is connected to the output terminal of the switch S1 and the motor M1, and the output terminal of the relay G1 outputs 28VDC.

[0083] The input terminal of the relay G2 is connected to the output terminal of the switch S1 and the motor M1, and the output terminal of the relay G2 outputs 18VDC.

[0084] The input terminal of relay G3 is connected to the output terminal of switch S1 and motor M1, and the output terminal of relay G2 outputs 24VDC and 5VDC.

[0085] Working principle: In this embodiment, switch S1 is HBY5-Z-22-R-AC220, relay G1 is 28VDC / 5A, relay G2 is 18VDC / 3A, and relay G3 is 24VDC / 5A.

[0086] The other parts of this embodiment are the same as those in Embodiment 1 above, so they will not be described again.

[0087] Example 3:

[0088] This embodiment is based on any one of Embodiments 1-2 above, such as Figure 4 As shown, the switching power supply module also includes a DC-DC boost module; the DC-DC boost module includes a relay G4;

[0089] The input terminal of relay G4 is connected to the 24VDC output terminal of relay G3, and the input terminal of relay G4 outputs 120VDC, 90VDC, and 60VDC.

[0090] The other parts of this embodiment are the same as any one of the above embodiments 1-2, so they will not be described again.

[0091] Example 4:

[0092] This embodiment is based on any one of embodiments 1-3 above, such as Figure 5 As shown, the control board also includes a resistance measurement module;

[0093] The resistance measurement module includes a resistance measurement interface JP6, an ohmmeter PR1, and an ohmmeter PR2;

[0094] The input terminal of the resistance measurement interface JP6 is connected to the engine accessory, and the output terminal of the resistance measurement interface JP6 is connected to the input terminals of ohmmeter PR1 and ohmmeter PR2.

[0095] The input terminal of the ohmmeter PR1 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the ohmmeter PR1 is connected to the relay board via an RS485 bus.

[0096] The input terminal of the ohmmeter PR2 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the ohmmeter PR2 is connected to the relay board via an RS485 bus.

[0097] Working principle: In this embodiment, ohmmeter PR1 is AD4R-0012-30R, and ohmmeter PR2 is AD4R-0012-200K.

[0098] The other parts of this embodiment are the same as any one of the embodiments 1-3 above, so they will not be described again.

[0099] Example 5:

[0100] This embodiment is based on any one of embodiments 1-4 above, such as Figure 6 As shown, the DC signal input module includes a first analog input module, a second analog input module, a socket XS2, a frequency counter U1, and an amplifier U30;

[0101] The input terminal of the first analog input module is connected to the 24VDC output terminal and the 18VDC output terminal of the relay G3. The output terminal of the first analog input module is connected to the socket XS2 and connected to the relay board via the RS485 bus.

[0102] The input terminal of the second analog input module is connected to the 24VDC output terminal of the relay G3 and the host computer, and the output terminal of the second analog input module is connected to the socket XS2.

[0103] The input terminal of the frequency meter U1 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the frequency meter U1 is connected to the socket XS2 through the amplifier U30.

[0104] Working principle: In this embodiment, the first analog input module and the second analog input module are PK9015-DU. The first analog input module has 4 channels of 2A current and 12 channels of DC voltage ±10V. The second analog input module has 16 channels of DC voltage 100V. The socket XS2 is Y2-81ZKBM and the frequency meter U1 is IBF151.

[0105] The other parts of this embodiment are the same as any one of the embodiments 1-4 above, so they will not be described again.

[0106] Example 6:

[0107] This embodiment is based on any one of the embodiments 1-5 above, such as Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 As shown, the discrete signal input module includes a discrete switch module, socket JP5, and socket JS5;

[0108] The input terminal of the discrete signal input module is connected to the 24VDC output terminal of the relay G3, and the output terminal of the discrete signal input module is connected to the discrete switch module, socket JP5, socket JS5, and socket XS2.

[0109] The other parts of this embodiment are the same as any one of the above embodiments 1-5, so they will not be described again.

[0110] Example 7:

[0111] This embodiment is based on any one of embodiments 1-6 above, such as Figure 12 , Figure 18As shown, the acquisition module includes a latch and an electrical connector;

[0112] The input terminal of the latch is connected to the engine accessories and relay board, and the output terminal of the latch is connected to the input terminal of the electrical connector.

[0113] The input end of the electrical connector is connected to the 24VDC output end of the relay G3, and the output end of the electrical connector is connected to the relay board.

[0114] like Figure 24 As shown, XP2 in this embodiment is Y2-81TJ, and P1 in this embodiment is DPXBMA-67-33S-00-01. Working principle: The latch in this embodiment is 74LS573, and the electrical connector in this embodiment is ULN2803.

[0115] The test bench in this embodiment is a dedicated testing device for engine accessories of the PN:285A1300-1 engine. Users can effectively complete various performance tests of the engine accessories by operating the various control switches on the test bench panel. The test bench mainly consists of a chassis, front / rear panels, a touch screen all-in-one machine, relay boards, and I / O modules. The touch screen all-in-one machine connects to each I / O module and relay board via an RS485 communication bus. Test commands are sent from the host computer through the test software, and the electrical signals (voltage, current) collected by the I / O modules are read, processed, and displayed on the software interface. This test bench adopts a combined manual and automatic working mode. Using a touch screen all-in-one machine and dedicated test software, it can provide the 28VDC power supply required for testing the device under test, provide various analog signal inputs, provide various discrete signal inputs, provide discrete output test loads, and monitor the discrete output voltages in real time.

[0116] Signal provided:

[0117] DC power supply: 28VDC±5%, 5A;

[0118] Analog input signals: 15 channels (resistance and voltage signals);

[0119] Discrete inputs: 20 channels (GND / OPEN).

[0120] The interface is defined as shown in Table 1 below.

[0121] Table 1. Correspondence Table of Rear Panel "Test Cable" Interface Definitions

[0122]

[0123] Installation and operation instructions:

[0124] 1. Usage conditions

[0125] 1.1 Power Supply

[0126] AC power supply: 220VAC / 50Hz±10%, 3A.

[0127] 1.2 Environment

[0128] Temperature: -10℃ to +50℃;

[0129] Humidity: 10%RH~85%RH;

[0130] Air pressure: Field pressure.

[0131] For indoor use, it should be conducted in a dust-free, acid- and alkali-free, or other corrosive gas environment, free from strong mechanical vibration and impact, and free from strong electromagnetic fields.

[0132] 2. Usage Steps

[0133] 1) Preparation before testing

[0134] Step 1: Flip up the "220VAC" switch on the front panel. After confirming that there are no extra wires or other conductive materials on the test bench, connect the workshop 220VAC power supply to the test bench through the power cable.

[0135] Step 2: Press down the "220VAC" button on the front panel, and the indicator light on the switch will illuminate; the fan on the rear panel of the test bench will start spinning; the touch screen all-in-one machine will start up.

[0136] Step 3: Connect the device under test to the test bench via the test cable.

[0137] 2) Testing

[0138] Step 4: Click "Engine Accessory Test Bench Software" on the touch screen, enter the test part number and serial number, enter the test interface, and select the test item.

[0139] Step 5: Then conduct the test according to the test procedure in the CMM manual.

[0140] 3) Test completed

[0141] Step 6: Close the test software and flip up the "220VAC" switch on the front panel.

[0142] Step 7: Disconnect all connections and store the equipment as required.

[0143] 3 Precautions

[0144] 1) Before powering on, confirm that the “220VAC” switch on the front panel is in the pop-up position, and carefully check to ensure that there are no hanging wires or other excess conductive objects on the test bench.

[0145] 2) Do not plug or unplug the device under test while it is powered on. After the test is completed, turn off the touch screen all-in-one machine first, and then turn on the "220VAC" switch in sequence to disconnect all cables.

[0146] 3) In case of emergency, please first flip up the "220VAC" button switch.

[0147] 4. Verification

[0148] 4.1 Equipment Testing

[0149] The equipment was tested according to the YMGHCSN-225-YG "Acceptance Test Outline for Engine Accessory Test Bench".

[0150] 4.2 Header Verification

[0151] none.

[0152] 4.3 Verification Cycle

[0153] The calibration cycle for this equipment is every two years.

[0154] 5. Fault Analysis

[0155] Power failure:

[0156] 1) 220VAC power indicator light is not on: Check if the 220VAC power cord is broken, if the fuse is blown, and if the indicator light is damaged.

[0157] 2) No 28VDC power output: Check if the 28VDC switching power supply is working properly and if the switch wiring is correct.

[0158] The other parts of this embodiment are the same as any one of the embodiments 1-6 above, so they will not be described again.

[0159] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An engine accessory test bench, connected to engine accessories; comprising a front panel and a housing; characterized in that, The front panel is equipped with a touch display module and a 220VAC power interface; the chassis contains a control board. The control board includes a relay board, a switching power supply module, a DC signal input module, a discrete signal input module, and a data acquisition module. The input terminal of the switching power supply module is connected to the 220VAC power interface, and the output terminal of the switching power supply module is connected to the input terminal of the relay board. The input terminal of the relay board is connected to the output terminal of the DC signal input module, the output terminal of the discrete signal input module, and the output terminal of the touch display module; the output terminal of the relay board is connected to the input terminal of the acquisition module. The data acquisition module is connected to the engine accessory; The switching power supply module is used to obtain a 220VAC power signal based on the switching signal obtained from the 220VAC power interface; The DC signal input module is used to generate analog signals according to the test instructions obtained from the host computer; The discrete signal input module is used to generate discrete signals according to the test instructions obtained from the host computer. The acquisition module is used to acquire electrical signals from engine accessories; The relay board is used to generate test results based on analog signals, discrete signals, and electrical signals. The touch display module is used to display test results in real time.

2. The engine accessory test bench according to claim 1, characterized in that, The switching power supply module includes a 220VAC socket XS1, a switch S1, a relay G1, a relay G2, a relay G3, and a motor M1; The input terminal of the 220VAC socket XS1 receives a 220VAC power signal, and the output terminal is connected to the switch S1. The input terminal of the relay G1 is connected to the output terminal of the switch S1 and the motor M1, and the output terminal of the relay G1 outputs 28VDC. The input terminal of the relay G2 is connected to the output terminal of the switch S1 and the motor M1, and the output terminal of the relay G2 outputs 18VDC. The input terminal of relay G3 is connected to the output terminal of switch S1 and motor M1, and the output terminal of relay G2 outputs 24VDC and 5VDC.

3. The engine accessory test bench according to claim 2, characterized in that, The switching power supply module further includes a DC-DC boost module; the DC-DC boost module includes a relay G4; The input terminal of relay G4 is connected to the 24VDC output terminal of relay G3, and the input terminal of relay G4 outputs 120VDC, 90VDC, and 60VDC.

4. The engine accessory test bench according to claim 2, characterized in that, The control board also includes a resistance measurement module; The resistance measurement module includes a resistance measurement interface JP6, an ohmmeter PR1, and an ohmmeter PR2; The input terminal of the resistance measurement interface JP6 is connected to the engine accessory, and the output terminal of the resistance measurement interface JP6 is connected to the input terminals of ohmmeter PR1 and ohmmeter PR2. The input terminal of the ohmmeter PR1 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the ohmmeter PR1 is connected to the relay board via an RS485 bus. The input terminal of the ohmmeter PR2 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the ohmmeter PR2 is connected to the relay board via an RS485 bus.

5. An engine accessory test bench according to claim 2, characterized in that, The DC signal input module includes a first analog input module, a second analog input module, a socket XS2, a frequency counter U1, and an amplifier U30; The input terminal of the first analog input module is connected to the 24VDC output terminal and the 18VDC output terminal of the relay G3. The output terminal of the first analog input module is connected to the socket XS2 and connected to the relay board via the RS485 bus. The input terminal of the second analog input module is connected to the 24VDC output terminal of the relay G3 and the host computer, and the output terminal of the second analog input module is connected to the socket XS2. The input terminal of the frequency meter U1 is connected to the 24VDC output terminal of the relay G3, and the output terminal of the frequency meter U1 is connected to the socket XS2 through the amplifier U30.

6. An engine accessory test bench according to claim 2, characterized in that, The discrete signal input module includes a discrete switch module. JP5 socket, JS5 socket; The input terminal of the discrete signal input module is connected to the 24VDC output terminal of the relay G3, and the output terminal of the discrete signal input module is connected to the discrete switch module, socket JP5, socket JS5, and socket XS2.

7. The engine accessory test bench according to claim 1, characterized in that, The acquisition module includes a latch and an electrical connector; The input terminal of the latch is connected to the engine accessories and relay board, and the output terminal of the latch is connected to the input terminal of the electrical connector. The input end of the electrical connector is connected to the 24VDC output end of the relay G3, and the output end of the electrical connector is connected to the relay board.

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