Simulation test device and method for signal acquisition circuit of inductive pressure sensor

Abstract

The invention provides a simulation test device and method for an inductive pressure sensor signal acquisition circuit, and the device comprises a sensor simulation device and a signal acquisition circuit, and the sensor simulation device is connected with the signal acquisition circuit. The sensor simulation device comprises a voltage output unit and a multiplier unit which are connected with each other; the signal acquisition circuit is used for generating an excitation signal; the voltage output unit is used for generating an analog voltage signal; the multiplier unit is used for generating a voltage signal conforming to a multiplier transfer function according to the excitation signal and the analog voltage signal; the signal acquisition circuit is connected with an analysis device, and the analysis device obtains the alternating-current electromotive force, the external pressure and the excitation signal and determines a simulation test result. The beneficial effects of the invention are that the simulation test cost of the signal acquisition circuit of the inductive pressure sensor is reduced, and the simulation test accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor simulation testing, and particularly to a simulation testing device and method for an inductive pressure sensor signal acquisition circuit. Background Art

[0002] An inductive pressure sensor, also known as a variable reluctance pressure sensor, operates by changing the inductance of a coil when the connecting part moves under the action of pressure. According to different structural forms, it can be divided into two types: air-gap type and transformer type. In the aerospace and aviation industries, the air-gap type sensor is widely used due to its small size, simple structure, and vibration resistance.

[0003] The internal spring plate combination of the air-gap type sensor consists of a push rod, an armature, spring plates, and rivets. It moves up and down under the drive of the central rod of the sensor receiver, changing the air gap between the armature and the iron core combination, thereby changing the inductance of the circuit. The diaphragm in the sensor receiver combination serves as a sensitive element to sense the measured pressure. The diaphragm generates displacement, driving the push rod and armature in the spring plate combination to move up and down, changing the magnetic circuit gap between the iron core connected coil combination and the armature, and enabling the output stage of the differential transformer to output an electrical signal proportional to the pressure.

[0004] In order to accurately measure the test accuracy of the sensor, special test equipment generally needs to be designed and manufactured for measuring sensor products. According to the actual installation environment and test conditions of the sensor product, the test and measurement of the sensor are carried out, and the obtained sensor performance is the most real. However, in actual applications, the installation position structure of some sensors is special, and it is impossible to realize the test and measurement under the real installation conditions of the sensor, or when testing the sensor, the resources required are too large, and the cost of developing real test equipment is too high. Summary of the Invention

[0005] The main purpose of the embodiments of the present invention is to propose a simulation testing device and method for an inductive pressure sensor signal acquisition circuit, which reduces the simulation testing cost of the inductive pressure sensor signal acquisition circuit and improves the simulation testing accuracy.

[0006] One aspect of the embodiments of the present invention provides a simulation testing device for an inductive pressure sensor signal acquisition circuit, including:

[0007] A sensor simulation device and a signal acquisition circuit, the sensor simulation device and the signal acquisition circuit are connected;

[0008] The sensor simulation device includes a voltage output unit and a multiplier unit connected to each other;

[0009] The signal acquisition circuit is used to generate an excitation signal, and the voltage output unit is used to generate an analog voltage signal;

[0010] The multiplier unit is used to generate a voltage signal that conforms to the transfer function relationship according to the excitation signal and the analog voltage signal;

[0011] The sensor simulation device is used to determine the external pressure according to the voltage signal and output an alternating electromotive force according to the external pressure;

[0012] The signal acquisition circuit is connected to an analysis device, and the analysis device acquires the alternating electromotive force, the external pressure, and the excitation signal and determines the simulation test result.

[0013] According to the simulation test device of the inductive pressure sensor signal acquisition circuit, the sensor simulation device further includes a control unit, the control unit is connected to the voltage output unit, and the control unit is used to set the analog voltage signal of the voltage output unit in a human-computer interaction manner, where setting the analog voltage signal includes the amplitude and accuracy of the voltage signal.

[0014] According to the simulation test device of the inductive pressure sensor signal acquisition circuit, the sensor simulation device is further provided with a voltage follower unit, the voltage follower unit is connected to the multiplier unit, and the voltage follower unit is used to buffer the voltage signal output by the multiplier unit, and the input voltage and the output voltage of the voltage follower unit are the same.

[0015] According to the simulation test device of the inductive pressure sensor signal acquisition circuit, the sensor simulation device includes a simulation device input interface and a simulation device output interface, the simulation device input interface is used to input the excitation signal to the multiplier unit, the simulation device output interface is used to send the output signal of the voltage follower unit to the signal acquisition circuit, and the simulation device output interface is connected to the voltage follower unit.

[0016] According to the simulation test device of the inductive pressure sensor signal acquisition circuit, the multiplier unit uses a multiplier chip, and the multiplier chip is used to obtain the input information of the simulation device input interface and the input information of the voltage output unit, use the input information that satisfies the transfer function as the calculation result, and send the calculation result to the voltage follower unit.

[0017] According to the simulation test device of the inductive pressure sensor signal acquisition circuit, the signal acquisition circuit includes an excitation signal output interface and a sensor signal input interface, the excitation signal output interface is used to generate an excitation signal and send it to the simulation device input interface, and the sensor signal input interface is used to receive the voltage signal sent by the simulation device output interface.

[0018] Another aspect of the present invention also discloses a simulation test method for an inductive pressure sensor signal acquisition circuit, including:

[0019] According to the simulation test request, obtain the excitation signal and simulation signal settings sent by the signal acquisition circuit;

[0020] Generate an analog voltage signal according to the simulation signal settings, and generate a voltage signal that conforms to the transfer function relationship according to the analog voltage signal and the excitation signal;

[0021] Determine the external pressure according to the voltage signal, and determine the alternating electromotive force according to the external pressure. Determine the simulation test result according to the external pressure, alternating electromotive force and excitation signal.

[0022] According to the simulation test method for the inductive pressure sensor signal acquisition circuit described above, the method further includes:

[0023] After each simulation test, adjust the amplitude and accuracy of the voltage signal of the simulation signal settings;

[0024] Determine the simulation test result of the signal acquisition circuit according to the test results of multiple simulation tests. The simulation test result includes the acquisition range and acquisition accuracy of the signal acquisition circuit.

[0025] According to the simulation test method for the inductive pressure sensor signal acquisition circuit described above, the transfer function is W = X * Y / U, where X is the input of the input interface of the simulation device, Y is the input of the voltage output unit, and U is a constant according to the circuit design.

[0026] According to the simulation test method for the inductive pressure sensor signal acquisition circuit described above, where determining the external pressure according to the voltage signal, and determining the alternating electromotive force according to the external pressure, and determining the simulation test result according to the external pressure, alternating electromotive force and excitation signal, includes:

[0027] Determine the external pressure through the formula O = A * EX * P, where O is the voltage signal of the sensor simulation device, A is a constant, EX is the excitation signal, and P is the external pressure; the formula O = A * EX * P means that when the external pressure is constant, there is a certain proportional relationship between the voltage signal O output by the sensor simulation device and the excitation signal EX; when the excitation signal is constant, there is a certain proportional relationship between the voltage signal O output by the sensor simulation device and the external pressure P.

[0028] The beneficial effects of the present invention are as follows: By simulating the principle relationship between the electrical signal output by the inductive pressure sensor, the excitation signal EX, and the external pressure P through a circuit, the calculation and processing of the transfer function can be carried out through a multiplier to perform voltage simulations with different amplitudes and precisions. The voltage output unit is controlled to output voltage simulations of different amplitudes and precisions, enabling the inductive pressure sensor to be subjected to pressures of different magnitudes and precisions, improving the accuracy of the simulation test, and making the simulation test of the sensor signal acquisition circuit simple and efficient. The simulation test can be completed through the combination of the voltage output unit and the multiplier unit, reducing the cost of the simulation test and improving the integration degree, and being easy to be portable. Brief Description of the Drawings

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0030] Figure 1 FIG. is a schematic diagram of a simulation test device for an inductive pressure sensor signal acquisition circuit according to an embodiment of the present invention.

[0031] Figure 2 FIG. is a schematic diagram of another simulation test device for an inductive pressure sensor signal acquisition circuit according to an embodiment of the present invention.

[0032] Figure 3 FIG. is a principle block diagram of an AD734 multiplier chip according to an embodiment of the present invention.

[0033] Figure 4 FIG. is a schematic diagram of a simulation test method flow for an inductive pressure sensor signal acquisition circuit according to an embodiment of the present invention. Detailed Embodiments

[0034] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. In the subsequent description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of describing the present invention, and they do not have specific meanings by themselves. Therefore, "module", "component", or "unit" can be used interchangeably. In the subsequent description of the present invention, the continuous numbering of the method steps is for the convenience of review and understanding. Considering the overall technical solution of the present invention and the logical relationship between each step, adjusting the implementation order between steps will not affect the technical effects achieved by the technical solution of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0035] Refer to Figure 1 where Figure 1It is a schematic diagram of a simulation test device for an inductive pressure sensor signal acquisition circuit according to an embodiment of the present invention, including a sensor simulation device and a signal acquisition circuit, where the sensor simulation device is connected to the signal acquisition circuit; the sensor simulation device includes a voltage output unit and a multiplier unit connected to each other; the signal acquisition circuit is used to generate an excitation signal, the voltage output unit is used to generate an analog voltage signal; the multiplier unit is used to generate a voltage signal that conforms to the transfer function relationship according to the excitation signal and the analog voltage signal; the sensor simulation device is used to determine the external pressure according to the voltage signal and output an alternating electromotive force according to the external pressure; the signal acquisition circuit is used to collect the alternating electromotive force and determine the simulation test result according to the alternating electromotive force, the external pressure and the excitation signal.

[0036] In some embodiments, refer to Figure 2 Another schematic diagram of a simulation test device for an inductive pressure sensor signal acquisition circuit shown in the figure, which includes a control unit, a voltage signal output unit, a multiplier unit, and a voltage follower unit.

[0037] Among them, the control unit is connected to the voltage output unit, and the control unit is used to set the analog voltage signal of the voltage output unit through a human-computer interaction method, where setting the analog voltage signal includes the amplitude and accuracy of the voltage signal.

[0038] Among them, the sensor simulation device is also provided with a voltage follower unit, and the voltage follower unit is connected to the multiplier unit. The voltage follower unit is used to buffer the voltage signal output by the multiplier unit, and the input voltage and output voltage of the voltage follower unit are the same.

[0039] Among them, the sensor simulation device includes a simulation device input interface and a simulation device output interface. The simulation device input interface is used to input the excitation signal to the multiplier unit, and the simulation device output interface is used to send the output signal of the voltage follower unit to the signal acquisition circuit. The simulation device output interface is connected to the voltage follower unit.

[0040] In some embodiments, the multiplier unit uses a multiplier chip, and the multiplier chip is used to obtain the input information of the simulation device input interface and the input information of the voltage output unit, take the input information that satisfies the transfer function as the calculation result, and send the calculation result to the voltage follower unit.

[0041] In some embodiments, the multiplier unit is used to implement the function of the transfer function W = X * Y / U, receive the excitation signal output by the sensor signal acquisition circuit and the voltage signal output by the voltage signal output unit, and then output a voltage signal after multiplier processing, taking Figure 3 the principle block diagram of the AD734 multiplier chip as an example, where:

[0042] X = X1 - X2;

[0043] Y = Y1 - Y2;

[0044] Z = Z1 - Z2;

[0045] W = XY ÷ U - Z;

[0046] The AD734 multiplier chip can implement the transfer function calculation of W = XY / U.

[0047] Among them, the signal acquisition circuit includes an excitation signal output interface and a sensor signal input interface. The excitation signal output interface is used to generate an excitation signal and send it to the input interface of the simulation device, and the sensor signal input interface is used to receive the voltage signal sent by the output interface of the simulation device.

[0048] In some embodiments, the signal acquisition circuit is connected to an analysis device. The analysis device acquires the alternating electromotive force, the external pressure, and the excitation signal and determines the simulation test result. The analysis device may include a display interface.

[0049] According to Figure 2 As shown, in the embodiment of the present invention, the excitation signal output of the sensor signal acquisition circuit is connected to the input X of the multiplier unit, the voltage signal output by the voltage output unit is connected to the input Y of the multiplier unit, and the output signal W of the multiplier unit is connected to the sensor signal input interface of the sensor signal acquisition circuit after passing through the voltage follower unit.

[0050] Figure 4 is a schematic flowchart of the simulation test method for the inductive pressure sensor signal acquisition circuit according to the embodiment of the present invention, which includes but is not limited to steps S100 to S300:

[0051] S100, according to the simulation test request, obtain the excitation signal sent by the signal acquisition circuit and the simulation signal setting;

[0052] S200, generate an analog voltage signal according to the simulation signal setting, and generate a voltage signal that conforms to the transfer function relationship according to the analog voltage signal and the excitation signal;

[0053] S300, determine the external pressure according to the voltage signal, and determine the alternating electromotive force according to the external pressure, and determine the simulation test result according to the external pressure, the alternating electromotive force, and the excitation signal.

[0054] It can be understood that in combination with Figure 2, the multiplier unit can realize the function of the transfer function W = X * Y / U. Combining the above connection method, the embodiment of the present invention can simulate the principle of O = A * EX * P between the electrical signal output by the inductive pressure sensor, the excitation signal EX, and the external pressure P, where O is the voltage signal of the inductive pressure sensor, A is a constant, EX is the excitation signal, P is the external pressure, and U is a constant according to the circuit design.

[0055] According to the simulation method, adjusting the amplitude and accuracy of the voltage signal output by the voltage output unit is equivalent to simulating the magnitude and accuracy of the external pressure received by the inductive pressure sensor, and then verifying the acquisition range and acquisition accuracy of the sensor signal acquisition circuit, so as to realize the simulation test of the inductive pressure sensor signal acquisition circuit.

[0056] Among them, the excitation signal received by the inductive pressure sensor is EX, the external pressure received by the sensor is P, and the electrical signal output by the sensor is O. Then there is the following relationship:

[0057] When the external pressure is constant, there is a certain proportional relationship between the electrical signal O output by the sensor and the excitation signal EX; when the excitation signal is constant, there is a certain proportional relationship between the electrical signal O output by the sensor and the external pressure P.

[0058] It can be seen that the electrical signal output by the sensor has the following relationship with the excitation signal EX and the external pressure P:

[0059] O = A * EX * P.

[0060] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0062] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the described embodiment. Those skilled in the art can also make various equivalent deformations or substitutions without violating the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A simulation test device for an inductive pressure sensor signal acquisition circuit, characterized in that, Comprising: A sensor simulation device and a signal acquisition circuit, the sensor simulation device being connected to the signal acquisition circuit; The sensor simulation device includes a voltage output unit and a multiplier unit connected to each other; The signal acquisition circuit is used to generate an excitation signal, and the voltage output unit is used to generate an analog voltage signal; The multiplier unit is used to generate a voltage signal that conforms to the transfer function relationship according to the excitation signal and the analog voltage signal; The sensor simulation device is used to determine the external pressure according to the voltage signal and output an alternating electromotive force according to the external pressure; The signal acquisition circuit is connected to an analysis device, and the analysis device acquires the alternating electromotive force, the external pressure and the excitation signal and determines the simulation test result.

2. The simulation test device for the inductive pressure sensor signal acquisition circuit according to claim 1, characterized in that, The sensor simulation device further includes a control unit, the control unit being connected to the voltage output unit, and the control unit being used to set the analog voltage signal of the voltage output unit in a human-computer interaction manner, wherein setting the analog voltage signal includes the amplitude and accuracy of the voltage signal.

3. The simulation test device for the inductive pressure sensor signal acquisition circuit according to claim 1, wherein, The sensor simulation device is further provided with a voltage follower unit, the voltage follower unit being connected to the multiplier unit, and the voltage follower unit being used to buffer the voltage signal output by the multiplier unit, and the input voltage and the output voltage of the voltage follower unit being the same.

4. The simulation test device for the inductive pressure sensor signal acquisition circuit according to claim 3, characterized in that The sensor simulation device includes a simulation device input interface and a simulation device output interface, the simulation device input interface being used to input the excitation signal into the multiplier unit, and the simulation device output interface being used to send the output signal of the voltage follower unit to the signal acquisition circuit, and the simulation device output interface being connected to the voltage follower unit.

5. The simulation test device for the inductive pressure sensor signal acquisition circuit according to claim 4, characterized in that, The multiplier unit uses a multiplier chip, and the multiplier chip is used to acquire the input information of the simulation device input interface and the input information of the voltage output unit, take the input information that satisfies the transfer function as the calculation result, and send the calculation result to the voltage follower unit.

6. The simulation test device for the inductive pressure sensor signal acquisition circuit according to claim 4, wherein, The signal acquisition circuit includes an excitation signal output interface and a sensor signal input interface, the excitation signal output interface being used to generate an excitation signal and send it to the simulation device input interface, and the sensor signal input interface being used to receive the voltage signal sent by the simulation device output interface.

7. A simulation test method for an inductive pressure sensor signal acquisition circuit of the device according to any one of claims 1-6, characterized in that, Comprising: According to a simulation test request, acquiring the excitation signal and the simulation signal setting sent by the signal acquisition circuit; Generating an analog voltage signal according to the simulation signal setting, and generating a voltage signal that conforms to the transfer function relationship according to the analog voltage signal and the excitation signal; Determining the external pressure according to the voltage signal, and determining the alternating electromotive force according to the external pressure, and determining the simulation test result according to the external pressure, the alternating electromotive force and the excitation signal.

8. The simulation test method for the inductive pressure sensor signal acquisition circuit according to claim 7, characterized in that, The method further includes: After each simulation test, adjusting the amplitude and accuracy of the voltage signal of the simulation signal setting; Determining the signal acquisition circuit simulation test result according to the test results of multiple simulation tests, and the simulation test result includes the acquisition range and acquisition accuracy of the signal acquisition circuit.

9. The simulation test method for the inductive pressure sensor signal acquisition circuit according to claim 7, characterized in that The transfer function is W = X * Y / U, where X is the input of the input interface of the simulation device, Y is the input of the voltage output unit, and U is a constant determined according to the circuit design.

10. The simulation test method of the inductive pressure sensor signal acquisition circuit according to claim 7, characterized in that, Determining the external pressure according to the voltage signal, and determining the alternating electromotive force according to the external pressure, and determining the simulation test result according to the external pressure, the alternating electromotive force and the excitation signal, including: Determining the external pressure through the formula O = A * EX * P, where O is the voltage signal of the sensor simulation device, A is a constant, EX is the excitation signal, and P is the external pressure; the formula O = A * EX * P indicates that when the external pressure is constant, there is a certain proportional relationship between the voltage signal O output by the sensor simulation device and the excitation signal EX; when the excitation signal is constant, there is a certain proportional relationship between the voltage signal O output by the sensor simulation device and the external pressure P.

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