CN112067307A - LabVIEW-based data acquisition and monitoring system of small piston engine - Google Patents
LabVIEW-based data acquisition and monitoring system of small piston engine Download PDFInfo
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- CN112067307A CN112067307A CN202010908054.3A CN202010908054A CN112067307A CN 112067307 A CN112067307 A CN 112067307A CN 202010908054 A CN202010908054 A CN 202010908054A CN 112067307 A CN112067307 A CN 112067307A
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- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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Abstract
The invention discloses a data acquisition and monitoring system of a small piston engine based on LabVIEW, which comprises an engine console, the small piston engine, a cylinder pressure sensor, an acceleration sensor, a cylinder temperature sensor, a rotating speed sensor, an encoder, an oxygen sensor, an air-fuel ratio analyzer, a signal conditioning module, a data acquisition card and a computer, and is used for measuring and analyzing in real time the in-cylinder pressure signal, the cylinder cover vibration signal, the temperature signal, the rotating speed signal and the crankshaft position of the small piston engine so as to complete the state monitoring and evaluation of the performance of the small piston engine. The invention has convenient operation, simple interface and high reliability, and can accurately monitor the state of the small piston engine in real time.
Description
Technical Field
The invention relates to the technical field of engine data acquisition and monitoring, in particular to a LabVIEW-based data acquisition and monitoring system of a small piston engine.
Background
Small-size piston engine works under complicated changeable, high temperature, high pressure, many hot frictions's environment as unmanned aerial vehicle's power supply, some troubles often can appear, and this just needs carry out data monitoring and collection to small-size piston engine, prevents the emergence of trouble. The development of the sensor technology promotes the progress of the state monitoring technology of the small piston engine, and the state of the small piston engine needs to be monitored online in real time, so that the scheme for monitoring and acquiring the data of the small piston engine in real time online is provided, and the problem to be solved urgently is solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a data acquisition and monitoring system of a LabVIEW-based small piston engine aiming at the defects involved in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
the data acquisition and monitoring system of the small piston engine based on LabVIEW comprises an engine console, an air-fuel ratio analyzer, an oxygen sensor, a cylinder pressure sensor, a vibration sensor, a cylinder temperature sensor, a rotating speed sensor, an encoder, a signal conditioning module, a data acquisition card and a computer;
the engine console comprises an ECU, an ignition system, an oil supply system, a cooling system, a starting device and a preheating device and is used for being responsible for starting, running and stopping the small piston engine to be monitored;
the air-fuel ratio analyzer and the oxygen sensor are arranged at an exhaust pipe of the engine, wherein the oxygen sensor is used for monitoring the oxygen content of the tail gas of the engine and transmitting the oxygen content to the signal conditioning module;
the cylinder pressure sensor is used for monitoring the change condition of the pressure in the cylinder of the engine and transmitting the change condition to the signal conditioning module;
the vibration sensor is used for monitoring the variation condition of the vibration of a cylinder cover of the engine and transmitting the variation condition to the signal conditioning module;
the cylinder temperature sensor is used for monitoring the temperature change of the cylinder head of the engine and transmitting the temperature change to the signal conditioning module;
the rotating speed sensor is used for detecting the current rotating speed of the engine and transmitting the current rotating speed to the signal conditioning module;
the encoder is connected with the engine output shaft in a belt transmission mode, synchronously rotates with the engine output shaft, is used for calibrating the position of the engine crankshaft rotation angle through the encoder angle value and transmits the position to the signal conditioning module;
the signal conditioning module is used for conditioning detection signals of the air-fuel ratio analyzer, the oxygen sensor, the cylinder pressure sensor, the vibration sensor, the cylinder temperature sensor, the rotating speed sensor and the encoder into signals meeting the requirements of a data acquisition card and then transmitting the signals to the data acquisition card;
the data acquisition card is used for converting the analog signal converted by the signal conditioning module into a digital signal and transmitting the digital signal to the computer;
the computer is used for analyzing and displaying the received digital signals through LabVIEW.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, the cylinder pressure sensor adopts a direct-insertion type micro cylinder pressure sensor, and the front end of the cylinder pressure sensor is hermetically arranged in a cylinder of the engine through a perforation.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, the vibration sensor adopts a miniature piezoelectric acceleration sensor and is attached to a heat insulation platform of an engine cylinder cover through high-temperature quick-drying glue.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, the cylinder temperature sensor adopts PT100 and is fixed on a cylinder head of the engine through welding and screws.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, the rotating speed sensor adopts a Hall sensor, when a rotating shaft of the engine rotates, a magnetic core passes through the Hall sensor to cut a magnetic induction line, square wave signals are generated in a sensor circuit, edges of two continuous square wave signals are captured, and the current rotating speed of the engine is calculated according to the time difference of the two square wave signals.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, the encoder adopts a photoelectric encoder, the resolution ratio of the photoelectric encoder is 600P/R, a circle of small piston engine can be divided into 600 sectors at 360 degrees, the precision of each sector is 0.6 degrees, and the small piston engine corresponds to a working cycle of 360 degrees of a two-stroke piston engine; the encoder is connected with the output shaft of the engine in a belt transmission mode, synchronous rotation with the output shaft of the engine is guaranteed, and the position of the crank angle of the engine can be calibrated through the angle value of the encoder.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, the signal conditioning module comprises an in-cylinder pressure signal processing unit, a charge converter and a conditioning circuit of an encoder, wherein: the in-cylinder pressure signal processing unit is used for converting an output signal of the in-cylinder pressure sensor into an electric signal meeting the requirements of the acquisition card, the charge converter is used for converting an output signal of the vibration sensor into a signal meeting the requirements of the acquisition card, and the encoder conditioning circuit is used for conditioning the output signal of the encoder into a signal meeting the requirements of the acquisition card.
As a further optimization scheme of the data acquisition and monitoring system of the LabVIEW-based small piston engine, a PXIe-6368 data acquisition card is adopted by the data acquisition card, an NI SCB-68A anti-noise shielding I/O junction box is arranged at the front end of the data acquisition card, the output of a signal conditioning module is connected to the NI SCB-68A anti-noise shielding I/O junction box, and the output of the junction box is connected to the PXIe-6368 data acquisition card.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention provides a LabVIEW-based small piston engine data acquisition and monitoring system which is convenient to operate, simple in display interface, high in reliability and capable of efficiently monitoring and acquiring various signals of an engine in real time.
Drawings
FIG. 1 is a block diagram of an engine data acquisition system platform;
FIG. 2 is a diagram of sensor mounting locations on an engine;
FIG. 3 is a display of a front panel monitoring interface.
In the figure, 1 is a cylinder pressure sensor, 2 is a vibration sensor, 3 is a cylinder temperature sensor, 4 is an encoder and 5 is a rotating speed sensor.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in figure 1, the invention discloses a data acquisition and monitoring system of a LabVIEW-based small piston engine, which comprises an engine console, an air-fuel ratio analyzer, an oxygen sensor, a cylinder pressure sensor, a vibration sensor, a cylinder temperature sensor, a rotating speed sensor, an encoder, a signal conditioning module, a data acquisition card and a computer, wherein the air-fuel ratio analyzer is connected with the engine console;
the engine console comprises an ECU, an ignition system, an oil supply system, a cooling system, a starting device and a preheating device and is used for being responsible for starting, running and stopping the small piston engine to be monitored;
the air-fuel ratio analyzer and the oxygen sensor are arranged at an exhaust pipe of the engine, wherein the oxygen sensor is used for monitoring the oxygen content of the tail gas of the engine and transmitting the oxygen content to the signal conditioning module;
the cylinder pressure sensor is used for monitoring the change condition of the pressure in the cylinder of the engine and transmitting the change condition to the signal conditioning module;
the vibration sensor is used for monitoring the variation condition of the vibration of a cylinder cover of the engine and transmitting the variation condition to the signal conditioning module;
the cylinder temperature sensor is used for monitoring the temperature change of the cylinder head of the engine and transmitting the temperature change to the signal conditioning module;
the rotating speed sensor is used for detecting the current rotating speed of the engine and transmitting the current rotating speed to the signal conditioning module;
the encoder is connected with the engine output shaft in a belt transmission mode, synchronously rotates with the engine output shaft, is used for calibrating the position of the engine crankshaft rotation angle through the encoder angle value and transmits the position to the signal conditioning module;
the signal conditioning module is used for conditioning detection signals of the air-fuel ratio analyzer, the oxygen sensor, the cylinder pressure sensor, the vibration sensor, the cylinder temperature sensor, the rotating speed sensor and the encoder into signals meeting the requirements of a data acquisition card and then transmitting the signals to the data acquisition card;
the data acquisition card is used for converting the analog signal converted by the signal conditioning module into a digital signal and transmitting the digital signal to the computer;
the computer is used for analyzing and displaying the received digital signals through LabVIEW.
The signal conditioning module comprises an in-cylinder pressure signal processing unit, a charge converter and a conditioning circuit of an encoder, wherein: the in-cylinder pressure signal processing unit is used for converting an output signal of the in-cylinder pressure sensor into an electric signal meeting the requirements of the acquisition card, the charge converter is used for converting an output signal of the vibration sensor into a signal meeting the requirements of the acquisition card, and the encoder conditioning circuit is used for conditioning the output signal of the encoder into a signal meeting the requirements of the acquisition card.
The cylinder pressure sensor adopts a direct-insertion type micro cylinder pressure sensor, and the front end of the cylinder pressure sensor is hermetically arranged in a cylinder of an engine through a perforation (as shown in figure 2)
Position) for monitoring the variation of the in-cylinder pressure of the engine, the output end being connected to the input end of the in-cylinder pressure signal processing unit.
The vibration sensor adopts a miniature piezoelectric acceleration sensor, and is adhered to a heat insulation platform of an engine cylinder cover through high-temperature quick-drying glue (as shown in figure 2)
The cylinder pressure sensor side) for monitoring the variation of the vibration of the cylinder cover of the engine, and the output end is connected with the charge converter.
The cylinder temperature sensor adopts PT100 and is fixed on a cylinder head of an engine (as shown in figure 2) through welding and screws
) For monitoring changes in engine head temperature.
The encoder adopts a photoelectric encoder, the resolution ratio of the photoelectric encoder is 600P/R, namely, a circle of the encoder can be divided into 600 sectors at an equal angle of 360 degrees, the precision of each sector is 0.6 degree, and the encoder corresponds to a working cycle of the two-stroke piston engine for 360 degrees. The encoder is connected with the output shaft of the engine in a belt transmission mode (in figure 2)
The position of the encoder) is ensured to synchronously rotate with the output shaft of the engine, the position of the crank angle can be calibrated through the angle value of the encoder, and the output end of the encoder is connected with the signal conditioning circuit.
The rotating speed sensorThe Hall sensor is arranged above a red point and a green point of the rotating shaft of the engine (as shown in figure 2)
The position of the magnetic core is higher than the position of the magnetic induction line, the magnetic induction line is cut by the magnetic core, the sensor circuit generates a square wave signal, and the current rotating speed of the engine is calculated according to the time difference of two square wave signals by capturing the edges of two continuous square wave signals by the counter of the ECU.
The data acquisition card adopts a PXIe-6368 data acquisition card, the front end of the data acquisition card is an NI SCB-68A anti-noise shielding I/O junction box, the output of the signal conditioning module is connected to the NI SCB-68A anti-noise shielding I/O junction box, and the output of the junction box is connected to the PXIe-6368 data acquisition card.
The computer contains an engine data acquisition program which mainly comprises a front panel and a program block diagram. The front panel is used for monitoring the air-fuel ratio, the rotating speed and the crank angle of the engine in real time, as shown in FIG. 3; the block diagram includes both producer and consumer modes.
The front panel is used for monitoring signals of an air-fuel ratio, a rotating speed, a crank angle and the like of the engine in real time;
the producer mode is used for acquiring in-cylinder pressure signals, vibration signals and air-fuel ratio signals of the engine in real time, wherein AI voltage (analog input) and AO (analog output) adopt a mode of sharing a main time base, so that synchronous acquisition of the signals can be met, and later-stage data viewing and processing are facilitated;
the consumer mode comprises a secondary consumer, wherein the primary consumer mode is also called data processing consumer cycle and is mainly used for preprocessing the acquired data, independently indexing the acquired data, performing coefficient adjustment on the data according to parameters of various sensors, and finally binding the processed data into a queue to enter the data storage consumer cycle so as to facilitate the secondary consumer to store the data; the secondary consumer mode is also called data storage consumer cycle and is mainly used for data storage, data processed by the primary consumer is unbundled according to names, the data is unbundled and extracted, and then the data is created into a multi-dimensional array and written into a TDMS file.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The LabVIEW-based data acquisition and monitoring system of the small piston engine is characterized by comprising an engine console, an air-fuel ratio analyzer, an oxygen sensor, a cylinder pressure sensor, a vibration sensor, a cylinder temperature sensor, a rotating speed sensor, an encoder, a signal conditioning module, a data acquisition card and a computer;
the engine console comprises an ECU, an ignition system, an oil supply system, a cooling system, a starting device and a preheating device and is used for being responsible for starting, running and stopping the small piston engine to be monitored;
the air-fuel ratio analyzer and the oxygen sensor are arranged at an exhaust pipe of the engine, wherein the oxygen sensor is used for monitoring the oxygen content of the tail gas of the engine and transmitting the oxygen content to the signal conditioning module;
the cylinder pressure sensor is used for monitoring the change condition of the pressure in the cylinder of the engine and transmitting the change condition to the signal conditioning module;
the vibration sensor is used for monitoring the variation condition of the vibration of a cylinder cover of the engine and transmitting the variation condition to the signal conditioning module;
the cylinder temperature sensor is used for monitoring the temperature change of the cylinder head of the engine and transmitting the temperature change to the signal conditioning module;
the rotating speed sensor is used for detecting the current rotating speed of the engine and transmitting the current rotating speed to the signal conditioning module;
the encoder is connected with the engine output shaft in a belt transmission mode, synchronously rotates with the engine output shaft, is used for calibrating the position of the engine crankshaft rotation angle through the encoder angle value and transmits the position to the signal conditioning module;
the signal conditioning module is used for conditioning detection signals of the air-fuel ratio analyzer, the oxygen sensor, the cylinder pressure sensor, the vibration sensor, the cylinder temperature sensor, the rotating speed sensor and the encoder into signals meeting the requirements of a data acquisition card and then transmitting the signals to the data acquisition card;
the data acquisition card is used for converting the analog signal converted by the signal conditioning module into a digital signal and transmitting the digital signal to the computer;
the computer is used for analyzing and displaying the received digital signals through LabVIEW.
2. The LabVIEW-based small piston engine data acquisition and monitoring system as claimed in claim 1, wherein the cylinder pressure sensor is an in-line micro cylinder pressure sensor, and the front end of the in-line micro cylinder pressure sensor is installed in a cylinder of the engine through a perforated seal.
3. The LabVIEW-based data acquisition and monitoring system for the small piston engine, as claimed in claim 1, wherein the vibration sensor is a miniature piezoelectric acceleration sensor and is attached to the heat insulation platform of the engine cylinder cover through a high-temperature quick-drying adhesive.
4. The LabVIEW-based data acquisition and monitoring system for small piston engines, as claimed in claim 1, wherein the cylinder temperature sensor is PT100 and is fixed on the cylinder head of the engine by welding and screws.
5. The LabVIEW-based data acquisition and monitoring system for the small piston engine, as claimed in claim 1, wherein the speed sensor is a Hall sensor, when the rotating shaft of the engine rotates, the magnetic core passes through the Hall sensor, the magnetic induction wire is cut, a square wave signal is generated in the sensor circuit, the current speed of the engine is calculated by capturing the edges of two continuous square wave signals and according to the time difference of the two square wave signals.
6. The LabVIEW-based data acquisition and monitoring system for a small piston engine according to claim 1, wherein the encoder is an optical encoder with a resolution of 600P/R, capable of dividing a circle of 360 ° into 600 sectors with equal angle, each sector having a precision of 0.6 ° corresponding to 360 ° of a working cycle of a two-stroke piston engine; the encoder is connected with the output shaft of the engine in a belt transmission mode, synchronous rotation with the output shaft of the engine is guaranteed, and the position of the crank angle of the engine can be calibrated through the angle value of the encoder.
7. The LabVIEW-based small piston engine data acquisition and monitoring system of claim 1, wherein the signal conditioning module comprises an in-cylinder pressure signal processing unit, a charge converter and conditioning circuitry of an encoder, wherein: the in-cylinder pressure signal processing unit is used for converting an output signal of the in-cylinder pressure sensor into an electric signal meeting the requirements of the acquisition card, the charge converter is used for converting an output signal of the vibration sensor into a signal meeting the requirements of the acquisition card, and the encoder conditioning circuit is used for conditioning the output signal of the encoder into a signal meeting the requirements of the acquisition card.
8. The LabVIEW-based data acquisition and monitoring system for the small piston engine, as claimed in claim 1, wherein the data acquisition card is a PXIe-6368 data acquisition card, the front end of the data acquisition card is an NI SCB-68A anti-noise shielding I/O junction box, the output of the signal conditioning module is connected to the NI SCB-68A anti-noise shielding I/O junction box, and the output of the junction box is connected to the PXIe-6368 data acquisition card.
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Cited By (3)
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| CN113776713A (en) * | 2021-09-06 | 2021-12-10 | 滨州学院 | Method for testing friction force of piston skirt in real time in engine running process |
| CN113849987A (en) * | 2021-11-03 | 2021-12-28 | 中国民用航空飞行学院 | Performance test method and device of piston engine, electronic equipment and medium |
| CN114295387A (en) * | 2022-01-04 | 2022-04-08 | 中国人民解放军陆军装甲兵学院 | Real vehicle running parameter testing system for engine of tracked vehicle |
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Application publication date: 20201211 |