CN109357793B - Pressure measurement system and method based on voltage type pressure sensor - Google Patents
Pressure measurement system and method based on voltage type pressure sensor Download PDFInfo
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- CN109357793B CN109357793B CN201811437886.0A CN201811437886A CN109357793B CN 109357793 B CN109357793 B CN 109357793B CN 201811437886 A CN201811437886 A CN 201811437886A CN 109357793 B CN109357793 B CN 109357793B
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- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/005—Measuring force or stress, in general by electrical means and not provided for in G01L1/06 - G01L1/22
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
Abstract
The invention discloses a pressure measurement system and a pressure measurement method based on a voltage type pressure sensor, wherein the pressure measurement system comprises a main control module, a power supply module and the voltage type pressure sensor, wherein the power supply module is connected with the power supply end of the main control module, the power supply end of the voltage type pressure sensor is connected with the control voltage output end of the main control module and a first AD sampling interface, and the main control module outputs control voltage as an input power supply V of the voltage type pressure sensor pi And collect input power V of voltage type pressure sensor pi Number n of (a) of the number n pi The output end of the voltage type pressure sensor is connected with a second AD sampling interface of the main control module, and the main control module collects output voltage V of the voltage type pressure sensor po Number n of (a) of the number n po The main control module calculates the sum of the values of p=k×n by the formula po *P max /n pi +P 0 Calculating to obtain a measured pressure value P; wherein k, P 0 Is the correction parameter of the voltage type pressure sensor, P max Is the range of the voltage type pressure sensor. The invention improves the measurement accuracy of the voltage type pressure sensor in a simple and convenient way.
Description
Technical Field
The invention belongs to the field of pressure sensors, and particularly relates to a pressure measurement system and method based on a voltage type pressure sensor.
Background
The intelligent society and the internet of things need various sensing devices, various sensors are needed, and the pressure is used as a physical quantity and is closely related to the life and production of human beings. The characteristics of the Internet of things require big data and multipoint perception; and the low-power consumption sensor can be powered by a battery, so that the multipoint distribution control is convenient.
Voltage-type pressure sensors, compared to other types of pressure sensors, have the advantages that: the power consumption is low, and the power consumption can be in mu A level by matching with the control of the power supply time of the sensor; the defects are that: the pressure is collected under the influence of the power supply voltage for supplying power to the voltage type pressure sensor, and is generally considered to be equal to or has a fixed difference with the system power supply voltage; the power supply voltage for supplying power to the voltage type pressure sensor on each product of the same model is actually different, and the difference changes along with the change of factors such as temperature and the like in the whole product operation process. The existing pressure measurement system based on the voltage type pressure sensor comprises a main control module, a power supply module and the voltage type pressure sensor, wherein the power supply module supplies the main control module and the voltageThe voltage type pressure sensor is powered, the output end of the voltage type pressure sensor is connected with an AD sampling interface of the main control module, and the main control module collects output voltage V of the voltage type pressure sensor po Number n of (a) of the number n po And by the formula: v (V) po =V si *n po /2 N Calculating to obtain the output voltage V of the voltage type pressure sensor po Where N represents the number of bits of AD samples. Output voltage V of voltage type pressure sensor po Can be subjected to reference voltage (namely system power supply V) of a measuring chip (namely a singlechip in a main control module) during AD sampling si ) Influence of fluctuation variation. In laboratory settings, a high performance regulated power supply may be used at a cost, but when used on each small product, it is somewhat impractical to use a high performance regulated power supply; therefore, the reference voltage at the time of AD sampling is generally considered to be a fixed value; the reference voltage of the measuring chip on each product with the same model is different in AD sampling, and the difference changes along with the change of factors such as temperature and the like in the whole product operation process.
In order to solve the above problems, there are some methods of calibrating the pressure value of each collected product by a secondary system, the number of calibration points is determined by the requirement of the product, the number of calibration points is high, the number of calibration points is large, the requirement is low, and the two ends of the measurement range of the voltage type pressure sensor are calibrated, and then linear fitting is performed. The treatment methods have scientificity, but the limitation is obvious, the calibration process is complex, and the workload is large.
Disclosure of Invention
The invention aims to provide a pressure measurement system and a pressure measurement method based on a voltage type pressure sensor, so that the accuracy of measurement of the voltage type pressure sensor is improved in a simple and convenient mode.
The pressure measurement system based on the voltage type pressure sensor comprises a main control module, a power supply module and the voltage type pressure sensor, wherein the power supply module is connected with a power supply end of the main control module and provides a system power supply V for the main control module si The power end of the voltage type pressure sensor and the main control moduleThe control voltage output end is connected with a first AD sampling interface of the main control module, and the main control module outputs control voltage as an input power supply V of the voltage type pressure sensor pi And collect input power V of voltage type pressure sensor pi Number n of (a) of the number n pi The output end of the voltage type pressure sensor is connected with a second AD sampling interface of the main control module, and the main control module collects output voltage V of the voltage type pressure sensor po Number n of (a) of the number n po The grounding of the main control module is grounded, the grounding of the voltage type pressure sensor is grounded, and the main control module is used for controlling the input power supply V pi Number n of (a) of the number n pi And the output voltage V po Number n of (a) of the number n po The measured pressure value is obtained after the treatment.
The power module comprises a first battery BT1, a second battery BT2, a first resistor R1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor CE1 and a voltage stabilizer U1, wherein the first battery BT1 is connected with the second battery BT2 in parallel, the negative electrode of the second battery BT2 is grounded, the positive electrode of the second battery BT2 is connected with one end of the first resistor R1, one end of the first capacitor C1 and the input end of the voltage stabilizer U1, the other end of the first resistor R1 is connected with the enabling end of the voltage stabilizer, the other end of the first capacitor C1 is grounded, and is connected with the power end of the voltage stabilizer U1 (namely the power end of the voltage stabilizer U1 is grounded), the output end of the voltage stabilizer U1 is connected with one end of the second capacitor C2, one end of the third capacitor C3 and the positive electrode of the fourth capacitor CE1, and outputs a system power V si (the System Power supply V) si The power supply end input to the main control module), the other end of the second capacitor C2, the other end of the third capacitor C3 and the negative electrode of the fourth capacitor CE1 are grounded, and the ground of the voltage regulator U1 is grounded.
Preferably, the voltage stabilizer U1 is of a type TPS78233.
The pressure measurement method based on the voltage type pressure sensor adopts the pressure measurement system, and the method comprises the following steps: the main control module utilizes the input power supply V acquired by the first AD sampling interface pi Number n of (a) of the number n pi And the output voltage V acquired by the second AD sampling interface po Number n of (a) of the number n po By the formula p=k×n po *P max /n pi +P 0 Calculating to obtain a measured pressure value P; wherein k, P 0 Is the correction parameter of the voltage type pressure sensor, P max Is the range of the voltage type pressure sensor.
The invention utilizes the input power V of the voltage type pressure sensor pi Number n of (a) of the number n pi And output voltage V po Number n of (a) of the number n po To calculate a measured pressure value, the calculation of which is related to the system power supply V si Independently, the calculation of the pressure value introduces the input power V pi The digital quantity (namely, the power supply voltage difference and the variation factor of the power supply of the voltage type pressure sensor are considered), thereby improving the measurement accuracy of the voltage type pressure sensor.
Drawings
Fig. 1 is a schematic block circuit diagram of an embodiment.
Fig. 2 is a schematic circuit diagram of a power module according to an embodiment.
Fig. 3 is a schematic circuit diagram of the connection between the main control module and the voltage type pressure sensor in the embodiment.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The pressure measurement system based on a voltage type pressure sensor as shown in fig. 1, 2 and 3 comprises a main control module 1, a power supply module 2 and a voltage type pressure sensor 3.
As shown in fig. 2, the power module 2 includes a first battery BT1, a second battery BT2, a first resistor R1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor CE1, and a voltage regulator U1, the voltage regulator U1 is of a type TPS78233, the first battery BT1 is connected in parallel with the second battery BT2, the negative electrode of the second battery BT2 is grounded, the positive electrode of the second battery BT2 is connected to one end of the first resistor R1, one end of the first capacitor C1 and an input end (i.e., pin 1) of the voltage regulator U1, the other end of the first resistor R1 is connected to an enable end (i.e., pin 3) of the voltage regulator, the other end of the first capacitor C1 is grounded, and is connected to a power end (i.e., pin 2) of the voltage regulator U1, and the output end (i.e., pin 5) of the voltage regulator U1 is connected to one end (i.e., pin 5) of the second capacitor C2 and one end (i.e., pin 3) of the third capacitor C3Terminal, positive electrode of fourth capacitor CE1, and output system power supply V si The other end of the second capacitor C2, the other end of the third capacitor C3 and the negative electrode of the fourth capacitor CE1 are grounded, and the ground end (i.e., pin 4) of the voltage regulator U1 is grounded.
As shown in fig. 3, the circuit structure of the main control module 1 is in the prior art, the main control module 1 includes a single chip microcomputer U2, a crystal oscillator circuit, a program interface circuit and a decoupling circuit, the model of the single chip microcomputer U2 is EFM32TG840, the crystal oscillator circuit includes a crystal oscillator Y3, a fifth capacitor C5 and a sixth capacitor C6, the program interface circuit includes a connection terminal J1, a second resistor R2, a third resistor R3 and a fourth resistor R4, and the decoupling circuit includes a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10.
The output end of the voltage stabilizer U1 is connected with the power end of the main control module 1 to provide a system power V for the main control module 1 si The power end of the voltage type pressure Sensor 3 (i.e. P_sensor) is connected with the control voltage output end (i.e. the pin 33 of the single-chip microcomputer U2) of the main control module 1 and the first AD sampling interface (i.e. the pin 32 of the single-chip microcomputer U2) of the main control module 1, and the main control module 1 outputs the control voltage as an input power V of the voltage type pressure Sensor 3 pi The main control module 1 collects an input power supply V of the voltage type pressure sensor 3 through a first AD sampling interface pi Number n of (a) of the number n pi The output end of the voltage type pressure sensor 3 is connected with a second AD sampling interface (namely a pin 31 of the singlechip U2) of the main control module 1, and the main control module 1 collects the output voltage V of the voltage type pressure sensor 3 through the second AD sampling interface po Number n of (a) of the number n po The ground of the main control module 1 is grounded, and the ground of the voltage type pressure sensor 3 is grounded.
The method for measuring the pressure by adopting the pressure measuring system based on the voltage type pressure sensor comprises the following steps:
the main control module 1 collects an input power supply V of the voltage type pressure sensor 3 through a first AD sampling interface pi Number n of (a) of the number n pi The main control module 1 collects the output voltage V of the voltage type pressure sensor 3 through a second AD sampling interface po Number n of (a) of the number n po 。
Due to input power V pi Relative to the system power supply V si The relative values of (2) are: v (V) pi /V si = n pi /2 N Output voltage V po Relative to the system power supply V si The relative values of (2) are: v (V) po /V si = n po /2 N The pressure calculation formula is: p=k×v po *P max /V pi +P 0 Will input power V pi Output voltage V po Substituting the measured pressure value p=k×n into a pressure calculation formula po *P max /n pi +P 0 The method comprises the steps of carrying out a first treatment on the surface of the Therefore, the single chip microcomputer U2 passes through the formula p=k×n po *P max /n pi +P 0 Calculating to obtain a measured pressure value P; wherein k, P 0 Is the correction parameter of the voltage type pressure sensor 3, P max Is the range of the voltage type pressure sensor 3.
Calculation of the pressure value and the system power supply V si Independently, the calculation of the pressure value introduces the input power V pi Number n of (a) of the number n pi And the accuracy of the measurement of the voltage type pressure sensor is improved by taking the power supply voltage difference and the variation factor of the power supply of the voltage type pressure sensor into consideration.
Claims (3)
1. The utility model provides a pressure measurement method based on voltage type pressure sensor, the pressure measurement system who adopts includes main control module (1), power module (2) and voltage type pressure sensor (3), its characterized in that: the power module (2) is connected with the power end of the main control module (1) to provide a system power V for the main control module (1) si The power end of the voltage type pressure sensor (3) is connected with the control voltage output end of the main control module (1) and the first AD sampling interface of the main control module (1), and the main control module (1) outputs control voltage as an input power V of the voltage type pressure sensor (3) pi And collect the input power V of the voltage type pressure sensor (3) pi Number n of (a) of the number n pi The output end of the voltage type pressure sensor (3) is connected with a second AD sampling interface of the main control module (1), and the main control module is connected with the first AD sampling interface of the voltage type pressure sensor(1) Collecting output voltage V of voltage type pressure sensor (3) po Number n of (a) of the number n po The grounding of the main control module (1) is grounded, and the grounding of the voltage type pressure sensor (3) is grounded; the main control module (1) uses the input power supply V pi Number n of (a) of the number n pi And the output voltage V po Number n of (a) of the number n po By the formula p=k×n po *P max /n pi +P 0 Calculating to obtain a measured pressure value P; wherein k, P 0 Is the correction parameter of the voltage type pressure sensor, P max Is the range of the voltage type pressure sensor.
2. The pressure measurement method based on a voltage type pressure sensor according to claim 1, wherein: the power module (2) includes a first battery BT1, a second battery BT2, a first resistor R1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor CE1 and a voltage stabilizer U1, the first battery BT1 is connected in parallel with the second battery BT2, the negative electrode of the second battery BT2 is grounded, the positive electrode of the second battery BT2 is connected with one end of the first resistor R1, one end of the first capacitor C1 and the input end of the voltage stabilizer U1, the other end of the first resistor R1 is connected with the enabling end of the voltage stabilizer, the other end of the first capacitor C1 is grounded and connected with the power end of the voltage stabilizer U1, the output end of the voltage stabilizer U1 is connected with one end of the second capacitor C2, one end of the third capacitor C3 and the positive electrode of the fourth capacitor CE1, and the system power V is output si The other end of the second capacitor C2, the other end of the third capacitor C3 and the negative electrode of the fourth capacitor CE1 are grounded, and the ground of the voltage regulator U1 is grounded.
3. The pressure measurement method based on a voltage type pressure sensor according to claim 2, wherein: the model of the voltage stabilizer U1 is TPS78233.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811437886.0A CN109357793B (en) | 2018-11-29 | 2018-11-29 | Pressure measurement system and method based on voltage type pressure sensor |
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| CN201811437886.0A CN109357793B (en) | 2018-11-29 | 2018-11-29 | Pressure measurement system and method based on voltage type pressure sensor |
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| CN109357793B true CN109357793B (en) | 2023-10-20 |
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| CN112781772B (en) * | 2021-02-07 | 2022-06-03 | 中国石油天然气集团有限公司 | Online tensiometer system and method |
| CN114327236B (en) * | 2021-12-13 | 2024-04-09 | 昌辉汽车电器（黄山）股份公司 | Judgment method for adding voltage correction factor when singlechip receives AD signal |
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