CN113504004B - Cylinder pressure sensor calibration system and method - Google Patents
Cylinder pressure sensor calibration system and method Download PDFInfo
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- CN113504004B CN113504004B CN202110610754.9A CN202110610754A CN113504004B CN 113504004 B CN113504004 B CN 113504004B CN 202110610754 A CN202110610754 A CN 202110610754A CN 113504004 B CN113504004 B CN 113504004B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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Abstract
The invention relates to the technical field of gasoline engines, and discloses a system and a method for calibrating a cylinder pressure sensor, wherein the system comprises: an observer for mounting the cylinder pressure sensor; the pressurizing device is used for applying a plurality of groups of first preset pressures to the cylinder pressure sensor; the input end of the combustion analyzer is used for being connected with the cylinder pressure sensor; the input end of the pressure calibrator is connected with the cylinder pressure sensor, and the output end of the pressure calibrator is connected with the data processing module; the measurement and control unit is respectively electrically connected with the output end of the combustion analyzer and the data processing module; the ignition assembly is used for providing working power supply and pulse waves for the spark plug; and the oscilloscope is used for acquiring the waveform of the spark plug in the discharge state. The invention adopts the combustion analyzer and the pressure tester to measure the pressure data of the cylinder pressure sensor at the same time, avoids the possibility of accidental and error occurrence of the pressure data, and further ensures the calibration precision of the cylinder pressure sensor.
Description
Technical Field
The invention relates to the technical field of gasoline engines, in particular to a system and a method for calibrating a cylinder pressure sensor.
Background
The cylinder pressure sensor is a device capable of sensing the pressure in the oil cylinder and converting the pressure into an electric signal, is used for continuously monitoring the cylinder pressure of the gasoline engine, and has the characteristics of small size, simplicity and convenience in installation, long service life and the like. Typically, the cylinder pressure sensor is integrated on the spark plug and installed and tested as an assembly.
The cylinder pressure sensor needs to be periodically checked and corrected, and the testing accuracy of the cylinder pressure sensor is ensured. At present, only suppliers in the industry have detection and repair capabilities, but the cost is high, and the detection and repair cost is about 60% of new purchase cost, so that the management method of the internal engine calibration company for the cylinder pressure sensors uses a batch of new cylinder pressure sensors for each newly developed project, the cost of the mode is high, the working state of the cylinder pressure sensors cannot be judged in real time in the using process, and the risk of development failure caused by overlarge deviation of part of test data exists. In addition, some domestic laboratories can also purchase pressure verification equipment and technologies of suppliers to solve the calibration problem of the cylinder pressure sensor, but the investment cost is large in a short period (one set of verification instrument is about 100 ten thousand yuan), and the method is difficult to be suitable for enterprises with a small number of developed models.
Disclosure of Invention
In order to solve the technical problems of low accuracy and high verification cost of the cylinder pressure sensor in the using process, the invention provides a cylinder pressure sensor calibration system in a first aspect, which comprises:
an observer for mounting the cylinder pressure sensor;
the pressurizing device is used for applying a plurality of groups of first preset pressures to the cylinder pressure sensor;
the input end of the combustion analyzer is used for being connected with the cylinder pressure sensor;
the input end of the pressure calibrator is connected with the cylinder pressure sensor, and the output end of the pressure calibrator is connected with the data processing module;
the measurement and control unit is respectively electrically connected with the output end of the combustion analyzer and the data processing module;
the ignition assembly is used for providing working power supply and pulse waves for the spark plug;
and the oscilloscope is used for acquiring the waveform of the spark plug in the discharge state.
Further, the pressurizing device comprises a pressure control valve and a pressure generator for generating pressure, wherein one end of the pressure control valve is connected with the pressure generator, and the other end of the pressure control valve is used for connecting a cylinder pressure sensor;
wherein, pressure generator is air compressor or manual pressure testing pump.
Further, the ignition assembly comprises a pulse generator, an ignition power supply and an ignition switch electrically connected with the ignition power supply;
the observer is provided with an ignition coil, one end of the ignition coil is respectively connected with the pulse generator and the ignition switch, and the other end of the ignition coil is used for being connected with a spark plug.
The invention provides a cylinder pressure sensor calibration method in a second aspect, which comprises the following steps:
applying a plurality of groups of first preset pressures to the cylinder pressure sensor by adopting a pressurizing device, and respectively acquiring pressure measurement values of the cylinder pressure sensor under the first preset pressures of the groups by adopting a combustion analyzer and a pressure calibrator;
the method comprises the following steps that a measurement and control unit is adopted to receive a plurality of groups of pressure measurement values collected by a combustion analyzer and a plurality of groups of pressure measurement values collected by a pressure calibrator, and linear fitting is respectively carried out on the plurality of groups of pressure measurement values collected by the combustion analyzer and the plurality of groups of pressure measurement values collected by the pressure calibrator so as to obtain an average slope;
the measurement and control unit respectively calculates the deviation rate delta 1 of a plurality of groups of pressure measurement values acquired by the combustion analyzer and the deviation rate delta 2 of a plurality of groups of pressure measurement values acquired by the pressure calibrator;
a pulse generator is adopted to provide pulse signals for the spark plug, an ignition power supply is adopted to drive the spark plug to be in a discharging state, and an oscilloscope is adopted to obtain the working waveform of the spark plug.
Further, before applying multiple sets of first preset pressures to the cylinder pressure sensor by using the pressurizing device, the method further comprises the following steps:
checking whether the outer surface of the cylinder pressure sensor is intact and whether the pressure measuring head breaks down;
checking whether the center electrode of the spark plug is broken or ablated;
and measuring the size of a gap between the center electrode and the shell of the spark plug by using a thickness gauge.
Further, the pressurizing device comprises a pressure control valve and an air compressor, one end of the pressure control valve is connected with the air compressor, and the other end of the pressure control valve is connected with the cylinder pressure sensor.
Further, it is desirable to apply a second predetermined pressure to the spark plug using the pressurization device before the pulse generator is used to provide the pulse signal to the spark plug.
The third aspect of the present invention provides a cylinder pressure sensor calibration method, including the steps of:
providing a pulse signal for the spark plug by adopting a pulse generator, driving the spark plug to be in a discharge state by adopting an ignition power supply, and acquiring a working waveform of the spark plug by adopting an oscilloscope;
applying a plurality of groups of first preset pressures to the cylinder pressure sensor by adopting a pressurizing device, and respectively acquiring pressure measurement values of the cylinder pressure sensor under the first preset pressures of the groups by adopting a combustion analyzer and a pressure calibrator;
the method comprises the following steps that a measurement and control unit is adopted to receive multiple groups of pressure measurement values collected by a combustion analyzer and multiple groups of pressure measurement values collected by a pressure calibrator, and linear fitting is respectively carried out on the multiple groups of pressure measurement values collected by the combustion analyzer and the multiple groups of pressure measurement values collected by the pressure calibrator so as to obtain an average slope;
the measurement and control unit respectively calculates the deviation rate delta 1 of a plurality of groups of pressure measurement values acquired by the combustion analyzer and the deviation rate delta 2 of a plurality of groups of pressure measurement values acquired by the pressure calibrator.
Further, before the pulse generator is used for providing the pulse signal for the spark plug, the method further comprises the following steps:
checking whether the outer surface of the cylinder pressure sensor is intact and whether the pressure measuring head breaks down;
checking whether the center electrode of the spark plug is broken or ablated;
and measuring the size of a gap between the center electrode and the shell of the spark plug by using a thickness gauge.
Further, the pressurizing device comprises a pressure control valve and a pressure generator, wherein one end of the pressure control valve is connected with the pressure generator, and the other end of the pressure control valve is connected with a cylinder pressure sensor;
wherein, pressure generator is air compressor or manual pressure testing pump.
Compared with the prior art, the cylinder pressure sensor calibration system and method provided by the invention have the beneficial effects that:
the invention simulates the working pressure of a gasoline engine on a cylinder pressure sensor for multiple times through a pressurizing device, the combustion analyzer and the pressure calibrator are used for respectively acquiring pressure measurement values of the cylinder pressure sensor under different working pressures, the measurement and control unit respectively performs linear fitting on a plurality of groups of pressure measurement values of the cylinder pressure sensor and the pressure calibration unit to obtain pressure curves, and whether the working condition of the cylinder pressure sensor is abnormal or not is judged according to the average slope of the two pressure curves. Meanwhile, the measurement and control unit respectively calculates the deviation rates of the multiple groups of pressure measurement values of the measurement and control unit and analyzes the working stability of the cylinder pressure sensor according to the deviation rates so as to judge whether the pressure detection of the cylinder pressure sensor is accurate or not.
In addition, the invention judges whether the working state of the spark plug is normal by observing the waveform emitted by the spark plug in the discharge state, and further verifies whether the cylinder pressure sensor works normally.
The invention adopts the combustion analyzer and the pressure tester to measure the pressure data of the cylinder pressure sensor at the same time, avoids the possibility of accidental and error occurrence of the pressure data, and further ensures the calibration precision of the cylinder pressure sensor.
Drawings
FIG. 1 is a schematic diagram of a cylinder pressure sensor calibration system of the present invention;
FIG. 2 is a schematic diagram of one configuration of the cylinder pressure sensor calibration system of the present invention;
fig. 3 is another schematic diagram of the cylinder pressure sensor calibration system of the present invention.
In the figure, the position of the upper end of the main shaft,
10. a cylinder pressure sensor; 20. a spark plug;
1. an observer; 11. an ignition coil;
2. a pressurizing device; 21. a pressure control valve; 22. a pressure generator; 221. an air compressor; 222. a manual pressure test pump;
3. a combustion analyzer;
4. a pressure calibrator;
5. a data processing module;
6. a measurement and control unit;
7. an ignition assembly; 71. a pulse generator; 72. an ignition power supply; 73. an ignition switch;
8. an oscilloscope.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
Example 1
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of a cylinder pressure sensor calibration system according to the present invention, fig. 2 is a schematic diagram of a structure of the cylinder pressure sensor calibration system according to the present invention, and fig. 3 is a schematic diagram of another structure of the cylinder pressure sensor calibration system according to the present invention. Specifically, the cylinder pressure sensor calibration system comprises an observer 1, a pressurizing device 2, a combustion analyzer 3, a pressure calibrator 4, a measurement and control unit 6, an ignition assembly 7 and an oscilloscope 8. Wherein, the observer 1 is used for installing the cylinder pressure sensor 10; the pressurizing device 2 is used for applying a plurality of groups of first preset pressures to the cylinder pressure sensor 10; the input end of the combustion analyzer 3 is used for being connected with a cylinder pressure sensor 10; the input end of the pressure calibrator 4 is used for being connected with the cylinder pressure sensor 10, and the output end of the pressure calibrator 4 is connected with the data processing module 5; the measurement and control unit 6 is respectively electrically connected with the output end of the combustion analyzer 3 and the data processing module 5; the ignition assembly 7 is used for providing working power supply and pulse waves for the spark plug 20; the oscilloscope 8 is used to acquire the waveform of the spark plug 20 in the discharge state.
In order to facilitate a calibrator to observe the surface structure of the cylinder pressure sensor 10, the observer 1 of the present invention is made of a transparent material, and a mounting seat for fixing the cylinder pressure sensor 10 is disposed inside the observer 1. The input end of the combustion analyzer 3 is connected with the signal end of the cylinder pressure sensor 10 through a data line, so that the combustion analyzer 3 can collect the pressure measurement value of the cylinder pressure sensor 10. In the same way, the input of the pressure detector 4 is also connected to the signal terminal of the cylinder pressure sensor 10 via a data line. In some embodiments, the viewer 1 is provided with a through hole for the data line to pass through.
Further, the data processing module 5 may be independent of the outside of the measurement and control unit 6, or may be disposed inside the measurement and control unit 6 to form an integrated structure, which is not limited in the present invention. The model of the data processing module 5 may be ETS592. The data processing module 5 is also electrically connected with the measurement and control unit 6 through a data line.
Further, referring to fig. 2-3, the pressurizing device 2 of the present invention includes a pressure control valve 21 and a pressure generator 22 for generating pressure, wherein one end of the pressure control valve 21 is connected to the pressure generator 22, and the other end of the pressure control valve 21 is connected to the cylinder pressure sensor 10. The pressure generator 22 is an existing generator capable of generating gas or liquid with pressure higher than atmospheric pressure, such as an air compressor 221, a manual pressure test pump 222, and the like, and the pressure generator 22 acts on the cylinder pressure sensor 10 by outputting gas or liquid with pressure higher than atmospheric pressure to simulate the working pressure of the gasoline engine on the cylinder pressure sensor 10 during the working process, and collects the pressure measurement value output by the cylinder pressure sensor 10 to determine the working state of the cylinder pressure sensor 10. The pressure control valve 21 is used to adjust the pressure output by the pressure generator 22 to simulate the operation of the cylinder pressure sensor 10 at different operating pressures.
In some embodiments, according to the pressure condition of a typical gasoline engine on the cylinder pressure sensor 10, the first preset pressure applied to the cylinder pressure sensor 10 by the pressure generator 22 is adjusted by the pressure control valve 21 to be in a range of 10-80 bar, and the difference between any two adjacent sets of first preset pressure values is 10bar, that is, the first preset pressures applied to the cylinder pressure sensor 10 are respectively 10bar, 20bar, 30bar, 40bar, 50bar, 60bar, 70bar, and 80bar, pressure measurements of the cylinder pressure sensor 10 under the operation of the eight sets of first preset pressures are acquired by the combustion analyzer 3 and the pressure checker 4 at the same acquisition frequency, and the measurement and control unit 6 analyzes the pressure measurements to determine the operating state of the cylinder pressure sensor 10.
Further, referring to fig. 2-3, the ignition module 7 of the present invention includes a pulse generator 71, an ignition power source 72, and an ignition switch 73 electrically connected to the ignition power source 72; the observer 1 is provided with an ignition coil 11, one end of the ignition coil 11 is electrically connected with the pulse generator 71 and the ignition switch 73, and the other end of the ignition coil 11 is used for connecting the spark plug 20. In order to simulate the ignition action on an actual gasoline engine, the pulse generator 71 sets the proportional requirements to 5 milliseconds of magnetizing time and 0.5 milliseconds of discharging time, and the voltage value of the ignition power supply 72 is 12-14V. The pulse generator 71 and the ignition power supply 72 drive the spark plug 20 to enter a discharging state, and the oscilloscope 8 is used for acquiring the waveform of the spark plug 20 in the discharging state so as to judge whether the spark plug 20 works normally. In order to improve the accuracy of judging the spark plug 20, it is preferable to observe the waveform of the breakdown voltage in the range of 7 to 15kv on the oscilloscope 8, and judge whether or not there are 10 consecutive waveforms having the same structure, that is, whether or not the spark plug 20 is working normally.
In summary, the present invention uses the combustion analyzer 3 and the pressure tester to measure the pressure data of the cylinder pressure sensor 10 at the same time, so as to avoid the possibility of occurrence of accidental or error of the pressure data, and further ensure the calibration accuracy of the cylinder pressure sensor 10.
Example 2
s1, checking whether the outer surface of a cylinder pressure sensor is intact and whether a pressure measuring head breaks down; checking whether the center electrode of the spark plug is broken or ablated; and measuring the size of a gap between the center electrode and the shell of the spark plug by using a thickness gauge.
Wherein the gap size between the center electrode and the shell of the spark plug with a normal structure is 0.7-0.9 mm, if the gap size between the center electrode and the shell of the spark plug measured by a thickness gauge is out of the range of 0.7-0.9 mm, the structure of the spark plug is judged to be abnormal, and the following measuring steps can be stopped.
S2, applying multiple groups of first preset pressures to the cylinder pressure sensor by adopting a pressurizing device, and respectively acquiring pressure measurement values of the cylinder pressure sensor under the first preset pressures of the groups by adopting a combustion analyzer and a pressure calibrator.
Specifically, referring to fig. 2, the pressurizing device of embodiment 2 includes a pressure control valve and an air compressor, wherein one end of the pressure control valve is connected to the air compressor, and the other end of the pressure control valve is connected to the cylinder pressure sensor. The pressure control valve is used for adjusting the pressure output by the air compressor so as to simulate the working state of the cylinder pressure sensor under different working pressures.
The difference between the first preset pressures of any two adjacent groups may be the same or different, and the invention is not limited. Further, in order to facilitate the subsequent statistics and analysis of the pressure measurement values, the difference between any two adjacent sets of first preset pressure values is preferably the same. According to the pressure condition of a common gasoline engine to a cylinder pressure sensor, the value range of first preset pressure applied to the cylinder pressure sensor by an air compressor is adjusted to be 10-80 bar through a pressure control valve, the difference value between any two adjacent groups of first preset pressure values is 10bar, namely the first preset pressure applied to the cylinder pressure sensor is respectively 10bar, 20bar, 30bar, 40bar, 50bar, 60bar, 70bar and 80bar, and pressure measurement values of the cylinder pressure sensor under the working conditions of the eight groups of first preset pressures are acquired through a combustion analyzer and a pressure calibrator under the same acquisition frequency.
And S3, receiving multiple groups of pressure measurement values acquired by the combustion analyzer and multiple groups of pressure measurement values acquired by the pressure calibrator by using the measurement and control unit, and respectively performing linear fitting on the multiple groups of pressure measurement values acquired by the combustion analyzer and the multiple groups of pressure measurement values acquired by the pressure calibrator to obtain an average slope.
Specifically, the measurement and control unit records a first preset pressure relation curve between a plurality of groups of pressure measurement values acquired by the combustion analyzer and a pressurizing device and a first preset pressure relation curve between a plurality of groups of pressure measurement values acquired by the pressure calibrator and the pressurizing device by adopting a two-dimensional coordinate system, and the working state of the cylinder pressure sensor is judged by calculating the average slope of the two curves. In general, the average slope of the two curves of a properly functioning cylinder pressure sensor should be within 10 ± 0.1.
And S4, the measurement and control unit respectively calculates the deviation rate delta 1 of the multiple groups of pressure measurement values acquired by the combustion analyzer and the deviation rate delta 2 of the multiple groups of pressure measurement values acquired by the pressure calibrator.
The deviation rate is calculated by averaging a plurality of sets of pressure measurement values collected by the combustion analyzer or the pressure check meter, and then averaging the square of the difference between each set of pressure measurement values and the average. In general, the deviation ratio δ 1 and the deviation ratio δ 2 of the cylinder pressure sensor that operates normally are within ± 1%.
And S5, providing a pulse signal for the spark plug by adopting a pulse generator, driving the spark plug to be in a discharge state by adopting an ignition power supply, and acquiring a working waveform of the spark plug by adopting an oscilloscope.
In order to reflect the working state of the spark plug in the high-voltage environment, in embodiment 2, a pressurizing device is further used to apply a second preset pressure to the spark plug, and the second preset pressure is adjusted to be between 4 and 8bar by a pressure control valve, so as to simulate the discharge state of the spark plug in the high-voltage environment.
Further, in order to simulate the ignition action on the actual gasoline engine, the pulse generator setting proportion requirement can be that the magnetizing time is 5 milliseconds, the discharging time is 0.5 milliseconds, and the voltage value of the ignition power supply is 12-14V. The spark plug is driven to enter a discharging state through the pulse generator and the ignition power supply, and meanwhile, the waveform of the spark plug in the discharging state is obtained through the oscilloscope, so that whether the spark plug works in a normal state or not is judged. In order to improve the accuracy of judging the spark plug, the waveform of the breakdown voltage in the range of 7-15 kv is preferably observed on an oscilloscope, and whether 10 continuous waveforms with the same structure exist can be judged, namely whether the spark plug works normally can be judged.
Examples3
The present embodiment 3 is another calibration method of the cylinder pressure sensor calibration system based on the above embodiment 1, and specifically includes the following steps:
s1, checking whether the outer surface of a cylinder pressure sensor is intact and whether a pressure measuring head breaks down; checking whether the center electrode of the spark plug is broken or ablated; and measuring the size of a gap between the center electrode and the shell of the spark plug by using a thickness gauge.
Wherein the gap size between the center electrode and the shell of the spark plug with a normal structure is 0.7-0.9 mm, if the gap size between the center electrode and the shell of the spark plug measured by a thickness gauge is out of the range of 0.7-0.9 mm, the structure of the spark plug is judged to be abnormal, and the following measuring steps can be stopped.
And S2, providing a pulse signal for the spark plug by adopting a pulse generator, driving the spark plug to be in a discharge state by adopting an ignition power supply, and acquiring a working waveform of the spark plug by adopting an oscilloscope.
In order to simulate the ignition action on an actual gasoline engine, the pulse generator is set to have the proportion requirement that the magnetizing time is 5 milliseconds, the discharging time is 0.5 milliseconds, and the voltage value of the ignition power supply is 12-14V. The spark plug is driven to enter a discharging state through the pulse generator and the ignition power supply, and meanwhile, the waveform of the spark plug in the discharging state is obtained through the oscilloscope, so that whether the spark plug works in a normal state or not is judged. In order to improve the accuracy of judging the spark plug, the waveform of the breakdown voltage in the range of 7-15 kv is preferably observed on an oscilloscope, and whether 10 continuous waveforms with the same structure exist can be judged, namely whether the spark plug works normally can be judged.
And S3, applying multiple groups of first preset pressures to the cylinder pressure sensor by adopting a pressurizing device, and respectively acquiring pressure measurement values of the cylinder pressure sensor under the first preset pressures of the groups by adopting a combustion analyzer and a pressure calibrator.
Specifically, referring to fig. 3, the pressurizing device of embodiment 3 includes a pressure control valve and a pressure generator, wherein one end of the pressure control valve is connected to the pressure generator, and the other end of the pressure control valve is connected to the cylinder pressure sensor. Wherein, the pressure generator can be an air compressor or a manual pressure test pump. When pressure generator is manual pressure testing pump, compare with air compressor, it is better to jar pressure sensor formation pressure stability through liquid (for example water), nevertheless need weather or stoving jar pressure sensor after the calibration is finished, avoids jar pressure sensor to rust by the moisture. The pressure control valve is used for adjusting the pressure output by the pressure generator so as to simulate the working state of the cylinder pressure sensor under different working pressures.
The difference between the first preset pressures of any two adjacent groups may be the same or different, and the invention is not limited. Further, in order to facilitate the subsequent statistics and analysis of the pressure measurement values, the difference between any two adjacent groups of first preset pressure values is preferably the same. According to the pressure condition of a general gasoline engine to a cylinder pressure sensor, the value range of first preset pressure applied to the cylinder pressure sensor by a pressure generator is adjusted to be 10-80 bar through a pressure control valve, the difference value between any two adjacent groups of first preset pressure values is 10bar, namely the first preset pressure applied to the cylinder pressure sensor is respectively 10bar, 20bar, 30bar, 40bar, 50bar, 60bar, 70bar and 80bar, and pressure measurement values of the cylinder pressure sensor under the working conditions of the eight groups of first preset pressures are acquired through a combustion analyzer and a pressure calibrator under the same acquisition frequency.
And S4, receiving the multiple groups of pressure measurement values acquired by the combustion analyzer and the multiple groups of pressure measurement values acquired by the pressure calibrator by using the measurement and control unit, and respectively performing linear fitting on the multiple groups of pressure measurement values acquired by the combustion analyzer and the multiple groups of pressure measurement values acquired by the pressure calibrator to obtain an average slope.
Specifically, the measurement and control unit records a first preset pressure relation curve between a plurality of groups of pressure measurement values acquired by the combustion analyzer and a pressure device and a first preset pressure relation curve between a plurality of groups of pressure measurement values acquired by the pressure calibrator and a pressure device, and judges the working state of the cylinder pressure sensor by calculating the average slope of the two curves. In general, the average slope of the two curves of a properly functioning cylinder pressure sensor should be within 10 ± 0.1.
And S5, the measurement and control unit respectively calculates the deviation rate delta 1 of the multiple groups of pressure measurement values acquired by the combustion analyzer and the deviation rate delta 2 of the multiple groups of pressure measurement values acquired by the pressure calibrator.
The deviation rate is calculated by averaging a plurality of sets of pressure measurement values collected by the combustion analyzer or the pressure check meter, and then averaging the square of the difference between each set of pressure measurement values and the average. In general, the deviation ratio δ 1 and the deviation ratio δ 2 of the cylinder pressure sensor that operates normally are within ± 1%.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A cylinder pressure sensor calibration system, comprising:
an observer for mounting the cylinder pressure sensor;
the pressurizing device is used for applying a plurality of groups of first preset pressures to the cylinder pressure sensor;
the input end of the combustion analyzer is used for being connected with the cylinder pressure sensor;
the input end of the pressure calibrator is connected with the cylinder pressure sensor, and the output end of the pressure calibrator is connected with the data processing module;
the measurement and control unit is respectively electrically connected with the output end of the combustion analyzer and the data processing module;
the ignition assembly is used for providing working power supply and pulse waves for the spark plug;
the oscilloscope is used for acquiring the waveform of the spark plug in a discharge state;
the pressurizing device comprises a pressure control valve and a pressure generator for generating pressure, one end of the pressure control valve is connected with the pressure generator, and the other end of the pressure control valve is connected with a cylinder pressure sensor;
wherein, pressure generator is air compressor or manual pressure testing pump.
2. The cylinder pressure sensor calibration system of claim 1, wherein the ignition assembly comprises a pulse generator, an ignition power source, and an ignition switch electrically connected to the ignition power source;
the observer is provided with an ignition coil, one end of the ignition coil is respectively connected with the pulse generator and the ignition switch, and the other end of the ignition coil is used for being connected with a spark plug.
3. A cylinder pressure sensor calibration method is characterized by comprising the following steps:
applying a plurality of groups of first preset pressures to the cylinder pressure sensor by adopting a pressurizing device, and respectively acquiring pressure measurement values of the cylinder pressure sensor under the first preset pressures of the groups by adopting a combustion analyzer and a pressure calibrator;
the method comprises the following steps that a measurement and control unit is adopted to receive a plurality of groups of pressure measurement values collected by a combustion analyzer and a plurality of groups of pressure measurement values collected by a pressure calibrator, and linear fitting is respectively carried out on the plurality of groups of pressure measurement values collected by the combustion analyzer and the plurality of groups of pressure measurement values collected by the pressure calibrator so as to obtain an average slope;
the measurement and control unit respectively calculates the deviation rate delta 1 of a plurality of groups of pressure measurement values acquired by the combustion analyzer and the deviation rate delta 2 of a plurality of groups of pressure measurement values acquired by the pressure calibrator;
a pulse generator is adopted to provide pulse signals for the spark plug, an ignition power supply is adopted to drive the spark plug to be in a discharging state, and an oscilloscope is adopted to obtain the working waveform of the spark plug.
4. The method of calibrating a cylinder pressure sensor according to claim 3, further comprising, before applying the plurality of sets of the first preset pressures to the cylinder pressure sensor using the pressurizing means:
checking whether the outer surface of the cylinder pressure sensor is intact and whether the pressure measuring head breaks down;
checking whether the center electrode of the spark plug is broken or ablated;
and measuring the size of a gap between the center electrode and the shell of the spark plug by using a thickness gauge.
5. The cylinder pressure sensor calibration method according to claim 4, wherein the pressurizing means includes a pressure control valve and an air compressor, one end of the pressure control valve is connected to the air compressor, and the other end of the pressure control valve is connected to the cylinder pressure sensor.
6. The method of calibrating a cylinder pressure sensor according to claim 5, further comprising applying a second predetermined pressure to the spark plug using said pressurizing means before applying the pulse signal to the spark plug using the pulse generator.
7. A cylinder pressure sensor calibration method is characterized by comprising the following steps:
providing a pulse signal for the spark plug by adopting a pulse generator, driving the spark plug to be in a discharge state by adopting an ignition power supply, and acquiring a working waveform of the spark plug by adopting an oscilloscope;
applying a plurality of groups of first preset pressures to the cylinder pressure sensor by adopting a pressurizing device, and respectively acquiring pressure measurement values of the cylinder pressure sensor under the first preset pressures of the groups by adopting a combustion analyzer and a pressure calibrator;
the method comprises the following steps that a measurement and control unit is adopted to receive a plurality of groups of pressure measurement values collected by a combustion analyzer and a plurality of groups of pressure measurement values collected by a pressure calibrator, and linear fitting is respectively carried out on the plurality of groups of pressure measurement values collected by the combustion analyzer and the plurality of groups of pressure measurement values collected by the pressure calibrator so as to obtain an average slope;
the measurement and control unit respectively calculates the deviation rate delta 1 of a plurality of groups of pressure measurement values acquired by the combustion analyzer and the deviation rate delta 2 of a plurality of groups of pressure measurement values acquired by the pressure calibrator.
8. The method of calibrating a cylinder pressure sensor according to claim 7, further comprising, before applying a pulse signal to a spark plug using a pulse generator:
checking whether the outer surface of the cylinder pressure sensor is intact and whether the pressure measuring head breaks down;
checking whether the center electrode of the spark plug is broken or ablated;
and measuring the size of a gap between the center electrode and the shell of the spark plug by using a thickness gauge.
9. The method of calibrating a cylinder pressure sensor according to claim 8, wherein the pressurizing means includes a pressure control valve and a pressure generator, one end of the pressure control valve is connected to the pressure generator, and the other end of the pressure control valve is connected to the cylinder pressure sensor;
wherein, pressure generator is air compressor or manual pressure testing pump.
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