Pressure sensor response time detection device

Abstract

The utility model discloses a pressure sensor response time detection device which comprises a pressure reading unit, a control unit and an interaction unit. The control signal output end of the pressure reading unit is connected with the control signal input end of the control unit, and the data acquisition end of the pressure reading unit is connected with the data output end of a detected pressure sensor; the driving output end of the control unit is connected with the control end of the electromagnetic valve, one port of the electromagnetic valve is communicated with an external air source, and the other port of the electromagnetic valve is communicated with a pressure acquisition interface of the detected pressure sensor; and the interaction unit is used for data communication between the pressure reading unit and an upper computer. The pressure sensor instant pressure change response time testing circuit has the advantages that time testing of instant pressure change response of the pressure sensor is achieved, performance testing of the installed and used pressure sensor is facilitated, a reliable basis can be provided for model selection of the pressure sensor, and meanwhile the circuit is simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] This utility model relates to a pressure sensor detection device, and more particularly to a pressure sensor response time detection device. Background Technology

[0002] Currently, pressure sensors may encounter situations where the air pressure source changes instantaneously during use. Therefore, if the pressure sensor's response time cannot meet the operational requirements of the instrument or equipment, it will lead to malfunctions. Existing pressure detection devices mostly provide the pressure sensor with a corresponding pressure and then directly read the pressure value from the sensor in a single reading to determine whether the pressure sensor is qualified. However, they do not test the response time and performance of the pressure sensor during instantaneous pressure changes, thus failing to meet the requirements for operating conditions with instantaneous air pressure changes. Summary of the Invention

[0003] In view of this, the present invention provides a pressure sensor response time detection device, providing a reliable basis for the selection of pressure sensors.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The pressure sensor response time detection device of this utility model includes a pressure reading unit, a control unit, and an interaction unit; the control signal output terminal of the pressure reading unit is connected to the control signal input terminal of the control unit, and the data acquisition terminal of the pressure reading unit is connected to the data output terminal of the pressure sensor being detected; the drive output terminal of the control unit is connected to the control terminal of the solenoid valve, one port of the solenoid valve is connected to an external air source, and the other port of the solenoid valve is connected to the pressure acquisition interface of the pressure sensor being detected; the interaction unit is used for data communication between the pressure reading unit and the host computer.

[0006] Optionally, the pressure reading unit is a microcontroller U1; the control unit consists of a push-pull power amplifier circuit and a drive circuit, the control signal input terminal of the push-pull power amplifier circuit is connected to the control signal output terminal of the microcontroller U1, the output terminal of the push-pull power amplifier circuit is connected to the input terminal of the drive circuit, and the output terminal of the drive circuit is connected to the control terminal of the solenoid valve; the interaction unit is a serial communication chip U2.

[0007] Optionally, the push-pull power amplifier circuit and drive circuit include an NPN transistor Q1, a PNP transistor Q2, and a MOSFET Q3. The transistors Q1 and Q2 form a push-pull power amplifier circuit. The input terminal of the push-pull power amplifier circuit is connected to the control signal output terminal of the microcontroller U1 via a resistor R1. The output terminal of the push-pull power amplifier circuit is connected to the gate of the MOSFET Q3 via a resistor R2. The drain of the MOSFET Q3 is connected to the +24V operating voltage of the solenoid valve via a freewheeling diode D1. The pressure acquisition interface of the pressure sensor being detected is connected in parallel with the freewheeling diode D1. The source of the MOSFET Q3 is connected to the ground terminal GND.

[0008] Furthermore, a series branch consisting of a light-emitting diode LED1 and a resistor R4 is connected in parallel across the freewheeling diode D1 to indicate the current circuit operating status.

[0009] The advantages of this invention are that it enables the instantaneous pressure change response time test of the pressure sensor, facilitates the performance test of the pressure sensor already installed and in use, and can also provide a reliable basis for the selection of pressure sensors. At the same time, the circuit structure is simple and the manufacturing cost is low. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the circuit principle of this utility model. Detailed Implementation

[0011] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0012] It should be noted that in the description of this utility model, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0013] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "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.

[0014] like Figure 1As shown, the pressure sensor response time detection device of this utility model includes a pressure reading unit 1, a control unit 2, and an interaction unit 3. The control signal output terminal of the pressure reading unit 1 is connected to the control signal input terminal of the control unit 2, and the data acquisition terminal of the pressure reading unit 1 is connected to the data output terminal of the pressure sensor under test through interface J1. The drive output terminal of the control unit 2 is connected to the control terminal of the solenoid valve through interface J2. One port of the solenoid valve is connected to an external air source, and the other port of the solenoid valve is connected to the pressure acquisition interface of the pressure sensor under test. The interaction unit 3 is used for data communication between the pressure reading unit and the host computer.

[0015] Advantageously or exemplaryly, the pressure reading unit 1 is a microcontroller U1 (model: GD32F103TBU6); the control unit 1 consists of a push-pull power amplifier circuit and a drive circuit, the control signal input terminal of the push-pull power amplifier circuit is connected to the IO port of the microcontroller U1, the output terminal of the push-pull power amplifier circuit is connected to the input terminal of the drive circuit, and the output terminal of the drive circuit is connected to the control terminal of the solenoid valve; the interaction unit 3 is a serial communication chip U2 (model: CH340N) used for data communication between the pressure reading unit 3 and the host computer PC.

[0016] Specifically, the push-pull power amplifier circuit and drive circuit include an NPN transistor Q1, a PNP transistor Q2, and a MOSFET Q3. Transistors Q1 and Q2 form the push-pull power amplifier circuit. The collector of transistor Q1 is connected to the +5V power supply. The emitter of transistor Q1 is connected to the emitter of transistor Q2 and the high-potential end of resistor R2. The collector of transistor Q2 is connected to ground GND. The drain of MOSFET Q3 is connected to the solenoid valve's operating voltage +24V after being connected to freewheeling diode D1. The gate of MOSFET Q3 is connected to the low-potential end of resistor R2 and then to ground GND via pull-down resistor R3. The source of MOSFET Q3 is connected to ground GND. The pressure acquisition interface J2 of the pressure sensor being detected is connected in parallel with the freewheeling diode D1, which serves as a protection circuit when connected to an inductive load. Furthermore, a series branch consisting of a light-emitting diode LED1 and a resistor R4 is connected in parallel across the freewheeling diode D1 to indicate the current circuit operating status.

[0017] The working principle of this utility model is briefly described as follows:

[0018] Before the test begins, adjust the external air source to the set pressure and connect it to one port of the solenoid valve. Connect the other port of the solenoid valve to the pressure acquisition interface of the pressure sensor being tested. Connect the data output terminal of the pressure sensor being tested to the data acquisition port of the microcontroller U1 through interface J1.

[0019] At the start of the test, the microcontroller U1 continuously reads the pressure value of the pressure sensor under test and uploads it to the PC via the interaction unit 3. After reading a segment of data, the microcontroller U1 controls the level of the I / O port to ultimately control the solenoid valve to close and records the time point A of the solenoid valve closure. After the solenoid valve closes, the pressure sensor will experience a significant change in pressure data due to the instantaneous connection to the target pressure. After multiple tests, by observing the time difference between the instantaneous change in pressure value and the time point A of the solenoid valve closure, the response time of the pressure sensor can be obtained, and it can be determined whether the pressure sensor under test is abnormal.

[0020] Finally, it should be emphasized that the above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure sensor response time detection device, characterized in that: It includes a pressure reading unit, a control unit, and an interaction unit; the control signal output terminal of the pressure reading unit is connected to the control signal input terminal of the control unit, and the data acquisition terminal of the pressure reading unit is connected to the data output terminal of the pressure sensor being tested; the drive output terminal of the control unit is connected to the control terminal of the solenoid valve, one port of the solenoid valve is connected to an external air source, and the other port of the solenoid valve is connected to the pressure acquisition interface of the pressure sensor being tested; the interaction unit is used for data communication between the pressure reading unit and the host computer.

2. The pressure sensor response time detection device according to claim 1, characterized in that: The pressure reading unit is a microcontroller U1; the control unit consists of a push-pull power amplifier circuit and a drive circuit, the control signal input terminal of the push-pull power amplifier circuit is connected to the control signal output terminal of the microcontroller U1, the output terminal of the push-pull power amplifier circuit is connected to the input terminal of the drive circuit, and the output terminal of the drive circuit is connected to the control terminal of the solenoid valve; the interaction unit is a serial communication chip U2.

3. The pressure sensor response time detection device according to claim 2, characterized in that: The push-pull power amplifier circuit and drive circuit include transistors Q1, Q2, and MOSFET Q3. Transistors Q1 and Q2 form a push-pull power amplifier circuit. The input terminal of the push-pull power amplifier circuit is connected to the control signal output terminal of the microcontroller U1 via resistor R1. The output terminal of the push-pull power amplifier circuit is connected to the gate of the MOSFET Q3 via resistor R2. The drain of the MOSFET Q3 is connected to the working voltage of the solenoid valve via a freewheeling diode D1. The pressure acquisition interface of the pressure sensor being detected is connected in parallel with the freewheeling diode D1. The source of the MOSFET Q3 is connected to the ground terminal GND.

4. The pressure sensor response time detection device according to claim 3, characterized in that: The freewheeling diode D1 has a series branch consisting of a light-emitting diode LED1 and a resistor R4 connected in parallel across its two ends.

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