A device and method for quickly detecting the performance of a steering gear after installation

Abstract

The present invention proposes a device and method for rapid performance detection of a steering gear after installation, which belongs to the field of aviation equipment application technology. The device includes a microcontroller, a resistance measurement and filtering circuit, a micro switch on-off measurement circuit, a switch quantity monitoring and measurement circuit, and an industrial computer; the resistance measurement and filtering circuit, the micro switch on-off measurement circuit, and the switch quantity monitoring and measurement circuit condition the required detection signal, and transmit it to the industrial computer through a bus through the microcontroller for resolution and display. The present invention tests the coil resistance, switch quantity, etc. inside the steering gear through multiple detection circuits to achieve the function of rapid detection, and has the rapid detection capability that traditional detection methods do not have.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation equipment application, and in particular relates to a performance detection device and a detection method for a steering gear after installation. Background Art

[0002] The deflection of multiple control surfaces on an aircraft is mostly driven by an electro-hydraulic servo steering gear. The common control components in an electro-hydraulic servo steering gear mainly include solenoid valves, servo valves, displacement sensors, excitation coils, micro switches, etc. The normal performance of each component is the guarantee for the normal operation of the servo steering gear. After the servo steering gear is installed, it is required to measure the static resistance of the components and detect the oil circuit switching logic after the aircraft vibrates. The traditional detection method is to measure with a digital multimeter. Since the coil inside the servo steering gear is greatly affected by temperature factors, the temperature of the servo steering gear is relatively high in actual measurement, and the resistance value at the standard temperature needs to be converted through a formula. This test has many impact items and directly affects the production progress of aircraft testing. Therefore, it is necessary to design a performance testing device that can quickly complete the performance test. Summary of the invention

[0003] In order to solve the above problems in the prior art, the present invention proposes a device and method for quickly detecting the performance of a steering gear after installation.

[0004] The technical solution of the present invention is:

[0005] A device for quickly detecting the performance of a steering gear after installation comprises a microcontroller 1, a resistance measurement and filtering circuit 2, a micro switch on / off measurement circuit 3, a switch quantity monitoring and measuring circuit 4 and an industrial computer 5.

[0006] The microcontroller 1 is a 16-bit ADC acquisition board, which consists of 32 AD acquisition ports, 16 I ports and 16 O ports. Among them, the O port is used to control the relay on the resistance measurement and filtering circuit 2 to be turned on or off; the AD acquisition port sends the analog signal to the microcontroller 1 and converts it into a 16-bit digital signal, which is then sent to the industrial computer 5 for processing in a serial communication mode, and is used to collect the coil voltage value on the resistance measurement and filtering circuit 2; the I port sends the 5V high-level logic state on the connected line to the microcontroller, and is used to collect whether there is a 5V DC voltage on the line of the micro-switch on-off measurement circuit 3 and the switch quantity monitoring measurement circuit 4.

[0007] The resistance measurement and filtering circuit 2 is composed of a constant current source circuit built by 26 operational amplifiers, a 32-way signal filtering circuit and a multi-way relay control circuit. Among them, the constant current source circuit is connected to the non-mutual inductance coil in the steering gear through a special detection cable, and a constant current is provided to the non-mutual inductance coil, so that the non-mutual inductance coil in the steering gear generates an induced voltage. One end of the high potential at both ends of the non-mutual inductance coil in the steering gear is connected to the signal filtering circuit for filtering and then transmitted to the AD acquisition port of the microcontroller 1 for collecting the voltage of the non-mutual inductance coil. In order to eliminate the distortion of the collected voltage caused by mutual inductance, the relay control circuit is connected to the O terminal of the microcontroller 1 and the mutual inductance coil in the steering gear, and the 5V voltage output by the O terminal controls the relay to work, thereby controlling the mutual inductance coil in the steering gear to access the constant current source circuit, and then filtering through the filtering circuit to access the AD acquisition port of the microcontroller 1 for collecting the voltage of the mutual inductance coil.

[0008] The micro-switch on-off measurement circuit 3 is connected to the O port of the microcontroller 1 and the micro-switch in the steering gear, and outputs a 5V voltage through the O port of the microcontroller 1, enters one end of the micro-switch in the steering gear through the micro-switch on-off measurement circuit 3, and the other end of the micro-switch feeds back a 5V voltage into the I port of the microcontroller 1 for collection.

[0009] The switch quantity monitoring and measuring circuit 4 is composed of a photocoupler relay circuit, which is connected to the on-board steering gear control cable through a special detection cable. By adjusting the resistance on the photocoupler relay circuit, when the steering gear switch quantity signal voltage is between 27 and 30 V, the photocoupler relay is turned on, and the 5 V voltage connected to the photocoupler relay is transmitted to the I port of the microcontroller 1 for collection.

[0010] The industrial computer 5 is composed of a computer with Windows 7 system and test software, and is connected to the microcontroller 1 via a serial bus. The servo coil voltage, switch value, and micro switch state voltage 5V collected by the microcontroller 1 are transmitted to the test software to realize the processing and display of the collected data.

[0011] During the detection, the cable connecting the servo and the aircraft is disconnected, and the servo is connected to the rapid detection device through a special test cable. The resistance measurement and filtering circuit 2, the micro switch on-off measurement circuit 3, and the switch quantity monitoring and measurement circuit 4 condition the required detection signal and transmit it to the industrial computer 5 through the bus through the microcontroller 1 for solution and display.

[0012] Beneficial effects of the present invention: The present invention tests the coil resistance, switch value, etc. inside the steering gear through multiple detection circuits to achieve a rapid detection function, and has a rapid detection capability that traditional detection methods do not have. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1This is a schematic diagram of the structure of the device for quickly detecting the performance of the installed steering gear according to the present invention.

[0014] Figure 2 It is a schematic diagram of the process of the present invention.

[0015] In the figure: 1 microcontroller; 2 resistance measurement and filtering circuit; 3 micro switch on / off measurement circuit; 4 switch quantity monitoring and measurement circuit; 5 industrial computer. DETAILED DESCRIPTION

[0016] The specific implementation of the present invention is further described below in conjunction with the technical solution and the accompanying drawings.

[0017] A detection method for a performance rapid detection device after a steering gear is installed, and the specific implementation steps are as follows:

[0018] Step 1: Servo Coil Resistance Measurement

[0019] like Figure 1 As shown, the microcontroller 1 is a V5.2_32USB data acquisition card produced by Xinzheng Hengkai Electronic Technology Co., Ltd. The microcontroller 1 is powered by the 12V regulated power supply inside the industrial computer 5. There are 34 valve coils in the steering gear, which are connected to the resistance measurement and filtering circuit 2 through a special detection cable. The details are as follows:

[0020] 22 valve coils are connected to the 22 constant current source circuits on the resistance measurement and filtering circuit 2 respectively. The constant current source circuit provides a constant current to the servo valve coil, and the servo valve coil generates an induced voltage. The high potential ends of the 22 servo valve coils are connected to the 22 signal filtering circuits for filtering, and then transmitted to the AD1~AD22 acquisition ports of the microcontroller 1 for valve coil voltage acquisition.

[0021] The remaining 12 coils in the servo motor are divided into three types: servo valve 1 coil, servo valve 2 coil and excitation coil, and each type has 4 coils. Since the three coils will induct each other when connected to the constant current source circuit at the same time, the 4 groups of servo valve 1 coil, servo valve 2 coil and excitation coil are first connected to the 4 groups of relay control circuits in the resistance measurement and filtering circuit 2 respectively. Each group of relays is connected to the two O ports of the microcontroller 1, and the two O ports output three states of 0V_0V, 5V_5V, and 5V_0V. Each state corresponds to only one of the three coils connected to the constant current source circuit.

[0022] Through the control of the industrial computer 5, divided into 3 test steps, the O port of the microcontroller 1 is controlled to output three states, and the relay is controlled to work. First, the four servo valve 1 coils are sent to the constant current source circuit, and then connected to AD23~AD26 after passing through the filter circuit; then the servo valve 1 coil circuit is disconnected, and the four servo valve 2 coils are connected to the constant current source circuit, and then connected to AD23~AD26 after passing through the filter circuit; finally, the servo valve 2 coil is disconnected, and the four solenoid valve coils are connected to the constant current source circuit, and then connected to AD23~AD26 after passing through the filter circuit; finally, the collection of the induced voltage of the solenoid valve, servo valve, and excitation coil resistance in the steering gear is realized.

[0023] The collected voltage value is transmitted to the industrial computer 5, and the channel program corresponding to each AD collection port sets the voltage / constant current source current conversion to obtain the corresponding coil resistance value.

[0024] Since the resistance value will change at different temperatures, in order to achieve the function of automatic detection of whether it is qualified, the temperature correction formula is introduced into the correction algorithm:

[0025] R 20 =Ri / (1+0.004*(t-20))

[0026] Where Ri is the measured resistance; R 20 is the resistance value converted to 20℃; t is the measured servo temperature.

[0027] During the test, the actual temperature of the servo is input into the temperature window on the industrial computer 5. The resistance value displayed after the test is the resistance value of 20°C. By comparing it with the qualified resistance requirement value set by the software, it is displayed whether it is qualified. If it is unqualified, it will show which specific valve coil in the servo is unqualified.

[0028] Channel verification is performed on 32 AD acquisition channels. In each AD acquisition channel, a standard resistor is used to replace the servo connection resistance measurement and filter circuit 2. The resistance value displayed on the industrial computer 5 is compared with the standard resistance value, and the difference is compensated into the voltage-resistance conversion formula of the channel. The measured value displayed after correction reaches the standard resistance value, and the error is not more than 1%.

[0029] Step 2: Micro switch measurement

[0030] The special detection cable is connected to the micro switch in the steering gear, and the micro switch on-off measurement circuit 3 is connected to the O port of the microcontroller 1 and the micro switch in the steering gear. The 5V voltage is output through the O port of the microcontroller 1, and enters one end of the micro switch in the steering gear through the micro switch on-off measurement circuit 3. The other end of the micro switch feeds back the 5V voltage and enters the I port of the microcontroller 1 for collection. The industrial computer 5 automatically determines whether the collected I-end voltage is 5V. If so, the micro switch is connected, otherwise, the micro switch is disconnected.

[0031] Step 3: Measurement of switch quantity

[0032] Connect the special detection cable with the on-board servo control cable, transmit the 8-way switch signal +27V on the servo to the 8-way photocoupler relay on the switch monitoring and measuring circuit 4, adjust the resistance value on the 8-way photocoupler relay line respectively, so that when the voltage of the servo switch signal is between 27 and 30V, the photocoupler relay is turned on, and transmit the 5V voltage connected to the photocoupler relay to the 8-way I port of the microcontroller 1 for collection, and transmit it to the industrial computer 5 through the serial port bus for automatic judgment.

Claims

1. A method for detecting a performance rapid detection device, characterized in that: The method comprises the following steps: Step 1: Servo Coil Resistance Measurement There are 34 valve coils in the steering gear. First, 22 valve coils are connected to the 22 constant current source circuits on the resistance measurement and filtering circuit (2) respectively. The constant current source circuit provides a constant current to the steering gear valve coil, and the steering gear valve coil generates an induced voltage. The high potential ends of the two ends of the 22 steering gear valve coils are connected to the 22 signal filtering circuits for filtering, and then transmitted to the AD1~AD22 acquisition ports of the microcontroller (1) for valve coil voltage acquisition; The remaining 12 coils in the servo motor are divided into three types: servo valve 1 coil, servo valve 2 coil and excitation coil, and each type of coil has 4 coils. Since the three types of coils will induct each other when connected to the constant current source circuit at the same time, the four groups of servo valve 1 coil, servo valve 2 coil and excitation coil are first connected to the four groups of relay control circuits in the resistance measurement and filtering circuit (2) respectively; each group of relays is connected to two O ports of the microcontroller (1), and the two O ports output three states of 0V_0V, 5V_5V, and 5V_0V. In each state, only one of the three types of coils can be connected to the constant current source circuit. The O port of the microcontroller (1) is controlled by the industrial computer (5) to output three states to control the relay to work; first, the four servo valve 1 coils are sent to the constant current source circuit, and then connected to AD23-AD26 after passing through the filter circuit; then the servo valve 1 coil circuit is disconnected, and the four servo valve 2 coils are connected to the constant current source circuit, and then connected to AD23-AD26 after passing through the filter circuit; finally, the servo valve 2 coil is disconnected, and the four solenoid valve coils are connected to the constant current source circuit, and then connected to AD23-AD26 after passing through the filter circuit; The collected voltage value is transmitted to the industrial control computer (5), and the channel program corresponding to each AD acquisition port sets the voltage / constant current source current conversion to obtain the corresponding coil resistance value; Since the resistance value will change at different temperatures, in order to achieve the function of automatic detection of whether it is qualified, the temperature correction formula is introduced into the correction algorithm: R 20 =Ri / (1+0.004*(t-20)) Where Ri is the measured resistance; R 20 is the resistance value converted to 20℃; t is the measured servo temperature; During the test, the actual temperature of the servo is input on the industrial computer (5). The resistance value displayed after the test is the resistance value at 20°C. By comparing it with the required value of the qualified resistance inserted, it is displayed whether it is qualified. If it is unqualified, it will be displayed which valve coil in the servo is unqualified. Step 2: Micro switch measurement A special detection cable is connected to the micro switch in the steering gear, and the micro switch on-off measurement circuit (3) is connected to the O port of the microcontroller (1) and the micro switch in the steering gear. A 5V voltage is output through the O port of the microcontroller (1), and enters one end of the micro switch in the steering gear through the micro switch on-off measurement circuit (3). The other end of the micro switch feeds back a 5V voltage and enters the I port of the microcontroller (1) for collection. The industrial computer (5) automatically determines whether the collected I end voltage is 5V. If so, the micro switch is connected, otherwise, the micro switch is disconnected. Step 3: Measurement of switch quantity The dedicated detection cable is connected to the steering gear control cable, and the 8-way switching signal +27V of the steering gear is transmitted to the 8-way optocoupler relay on the switch quantity monitoring and measuring circuit (4). The resistance values ​​on the 8-way optocoupler relay circuits are adjusted respectively, so that when the voltage of the steering gear switch quantity signal is between 27 and 30V, the optocoupler relay is turned on, and the 5V voltage connected to the optocoupler relay is transmitted to the 8-way I port of the microcontroller (1) for collection, and then transmitted to the industrial control computer (5) through the serial port bus for automatic judgment.

2. The detection method according to claim 1, characterized in that: The step 1 also includes channel verification: verifying the 32 AD acquisition channels, replacing the steering gear connection resistance measurement and filtering circuit (2) with a standard resistor in each AD acquisition channel, comparing the resistance value displayed on the industrial computer (5) with the standard resistance value, compensating the difference into the voltage-resistance conversion formula of the channel, and achieving the standard resistance value through the correction displayed measured value, with an error of no more than 1%.

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