CN112213111A - Engine timing measurement method and system and storage medium - Google Patents
Engine timing measurement method and system and storage medium Download PDFInfo
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- CN112213111A CN112213111A CN202011047839.2A CN202011047839A CN112213111A CN 112213111 A CN112213111 A CN 112213111A CN 202011047839 A CN202011047839 A CN 202011047839A CN 112213111 A CN112213111 A CN 112213111A
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- engine
- crankshaft
- cylinder pressure
- timing measurement
- signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/06—Testing internal-combustion engines by monitoring positions of pistons or cranks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
Abstract
The invention discloses an engine timing measurement method, an engine timing measurement system and a storage medium, wherein the method comprises the following steps: measuring the rotation angle of a crankshaft of the engine through an angle marking instrument, measuring the position of the crankshaft of the engine through a crankshaft position sensor and outputting a position signal of the crankshaft of the engine, and measuring the pressure in an engine cylinder through a cylinder pressure sensor and outputting a cylinder pressure signal; acquiring a compression top dead center position of a piston of a cylinder of the engine through a cylinder pressure sensor, and defining the top dead center position as 0 degree; and the crankshaft position signal and the cylinder pressure signal are connected into a lower computer combustion analyzer, the crankshaft position signal and the cylinder pressure signal are displayed through an upper computer, and the angle of the tooth missing position is measured, so that the timing measurement of the engine is realized. The invention can effectively utilize the existing resources, improve the measurement precision, reduce the labor intensity, shorten the test time and improve the working efficiency.
Description
Technical Field
The invention relates to the technical field of engine timing measurement, in particular to an engine timing measurement method, an engine timing measurement system and a storage medium.
Background
The engine timing is a control reference of an electronic control system, and is a basic condition that fuel injection and ignition can be executed at the correct time, and a variable valve can be in the correct position at the correct time. Before the calibration of the engine pedestal or the performance test is started, whether the timing signal of the engine conforms to a design value needs to be checked so as to ensure the accurate state of the engine, the safe test and the effective data. In the process of engine consistency check and troubleshooting, timing check is also indispensable.
The timing check is usually to confirm whether the relationship between the missing tooth position of the crank signal disc and the compression top dead center of the first cylinder piston coincides with a design value.
The current method of checking engine timing is: the circular angle scale is installed at the end of a flywheel, an angle pointer is fixed on an engine body, an engine crankshaft is manually rotated, meanwhile, a dial indicator is used for confirming that a first cylinder piston reaches the top dead center position, the pointer points to 0 degree of the dial scale, the crankshaft is continuously rotated to enable the pointer to just point to the tooth missing position of a crankshaft signal panel, the angle of the pointer on the angle scale at the moment is recorded, and timing measurement is achieved. The method has the following defects:
1. the timing relationship cannot be intuitively presented.
2. The measurement difficulty is big, and the error is big: when a top dead center is found, a dial indicator probe enters a combustion chamber from a spark plug mounting hole to contact the top of a piston, a crankshaft is slowly and carefully rotated, and the reading of the dial indicator is observed; the numerical value is obtained by observing the reading by naked eyes, and the error is large.
3. The process is various, and consumes time and labor: the ignition coil, the spark plug, the cylinder cover and the like of one cylinder need to be removed, a dial indicator, an angle scale and a pointer are installed, and the crankshaft is manually rotated, read and recorded. If the checking is needed in the bench test, the transmission shaft and the wiring harness connector are also needed to be detached, and the part tool for blocking measurement is needed. In the early development stage of the engine, the front end of the engine body is not marked with a piston position mark, and a cylinder cover is required to be detached and changed, and the position of a valve cam is observed to determine the top dead center of a piston compression stroke.
Disclosure of Invention
The invention provides an engine timing measurement method, an engine timing measurement system and a storage medium, and aims to effectively utilize the existing resources, improve the measurement precision, reduce the labor intensity, shorten the test time and improve the working efficiency.
In order to achieve the purpose, the invention provides an engine timing measurement method, which is applied to an engine timing measurement system, wherein the system comprises an angle indicator, a cylinder pressure sensor, a crankshaft position sensor, a lower computer combustion analyzer and an upper computer, and the method comprises the following steps:
measuring the rotation angle of a crankshaft of the engine through the angle marking instrument, measuring the position of the crankshaft of the engine through the crankshaft position sensor and outputting a position signal of the crankshaft of the engine, and measuring the pressure in an engine cylinder through the cylinder pressure sensor and outputting a cylinder pressure signal;
acquiring a compression top dead center position of a piston of a cylinder of the engine through the cylinder pressure sensor, and defining the top dead center position as 0 degree;
the crankshaft position signal and the cylinder pressure signal are connected into the lower computer combustion analyzer, the lower computer combustion analyzer uploads signal data to the upper computer through the Ethernet, the crankshaft position signal and the cylinder pressure signal are displayed through the upper computer, the angle of the tooth missing position is measured, and the timing measurement of the engine is achieved.
According to a further technical scheme of the invention, the step of measuring the crank angle of the engine by the angle marking instrument further comprises the following steps of:
and connecting the angle indicator, the cylinder pressure sensor and the crankshaft position sensor into the lower computer combustion analyzer.
A further technical solution of the present invention is that the engine timing measurement system further includes a dynamometer, and before the step of measuring the crank angle of the engine by the angle gauge, the engine timing measurement system further includes:
the engine was towed down to 2000 rpm by the dynamometer.
The further technical scheme of the invention is that Indicom software is installed on the upper computer.
In order to achieve the purpose, the invention also provides an engine timing measurement system, which comprises a lower computer combustion analyzer, an angle indicator, a cylinder pressure sensor, a crankshaft position sensor, a dynamometer and an upper computer;
the angle marking instrument is used for measuring the rotation angle of a crankshaft of the engine, the crankshaft position sensor is used for measuring the position of the crankshaft of the engine and outputting a position signal of the crankshaft of the engine, and the cylinder pressure sensor is used for measuring the pressure in an engine cylinder and outputting a cylinder pressure signal;
the cylinder pressure sensor is also used for acquiring the compression top dead center position of a piston of a cylinder of the engine, and the top dead center position is defined as 0 degree;
the lower computer combustion analyzer is used for acquiring the engine crankshaft position signal and the cylinder pressure signal and uploading signal data to the upper computer through an Ethernet;
and the upper computer is used for displaying the crankshaft position signal and the cylinder pressure signal, measuring the tooth missing position and realizing the timing measurement of the engine.
According to a further technical scheme, the angle indicator, the cylinder pressure sensor and the crankshaft position sensor are connected with the combustion analyzer.
According to a further technical scheme, the engine timing measuring system further comprises a dynamometer, and the dynamometer is used for dragging the engine to 2000 rpm.
The further technical scheme of the invention is that Indicom software is installed on the upper computer.
To achieve the above object, the present invention also proposes a computer-readable storage medium storing an engine timing measurement program which, when executed by a processor, performs the steps of the method as described above.
The engine timing measuring method, the engine timing measuring system and the storage medium have the beneficial effects that:
1. the timing relation is visually displayed by an angle-based curve, so that measurement, analysis, comparison and inspection are facilitated;
2. the existing equipment is tested by using the bench, the dynamometer is used for dragging the engine to rotate, the existing resources are effectively utilized, the labor intensity is reduced, the testing time is shortened, and the working efficiency is improved;
3. the angle marking instrument is adopted to measure the crank angle, the signals of the engine crank position sensor are directly collected, the tooth missing position of the crank signal is measured on software, and the measurement precision is improved.
Drawings
FIG. 1 is a schematic flow chart diagram of a preferred embodiment of the engine timing measurement method of the present invention;
FIG. 2 is a system architecture diagram of an engine timing measurement system;
FIG. 3 is a schematic diagram illustrating a relationship between a compression top dead center position of a first cylinder of an engine and a tooth-missing position of a signal gear plate of a crankshaft of the engine in design;
fig. 4 is a schematic view of the angle gage measuring the crank angle.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems that in the prior art, the timing measurement of an engine cannot be intuitively presented, the measurement difficulty is large, the error is large, the working procedures are various, and time and labor are consumed, the invention provides a solution.
The technical scheme adopted by the engine timing measuring method is that a lower computer combustion analyzer is mainly used for acquiring a crankshaft position signal and a cylinder pressure signal in real time and uploading the signals to an upper computer for display, so that the measurement, analysis and comparison inspection are facilitated; measuring the crank angle by using an angle marking instrument, directly acquiring a signal of a crank position sensor of an engine, displaying and measuring the tooth missing position of the crank signal on software, improving the measurement precision, and checking whether the output signal of the crank position sensor is normal; the engine is towed by a dynamometer by utilizing a bench test for testing the installed combustion analyzer, the cylinder pressure sensor and the angle indicator. Effectively utilize current resource, reduce intensity of labour, shorten test time, improve work efficiency.
Referring to fig. 1 to 4, the present invention provides an engine timing measurement method, wherein fig. 1 is a schematic flow chart of a preferred embodiment of the engine timing measurement method of the present invention, fig. 2 is a system architecture diagram of an engine timing measurement system, fig. 3 is a schematic diagram of a relationship between a compression top dead center position of a first cylinder of an engine and a tooth missing position of a signal gear ring of a crankshaft of the engine, and fig. 4 is a schematic diagram of a crankshaft rotation angle measured by a goniometer.
As shown in fig. 1, the engine timing measuring method of the present embodiment includes the steps of:
and step S10, measuring the crank angle of the engine through the angle marking instrument, measuring the position of the engine crank through the crank position sensor and outputting a crank position signal of the engine, and measuring the pressure in the engine cylinder through the cylinder pressure sensor and outputting a cylinder pressure signal.
In this embodiment, the engine timing measuring method is applied to an engine timing measuring system, as shown in fig. 2, the engine timing measuring system includes a lower computer combustion analyzer, an angle indicator, a cylinder pressure sensor, a crankshaft position sensor, and an upper computer, where the lower computer combustion analyzer, the angle indicator, and the cylinder pressure sensor are respectively connected to the upper computer, the upper computer may be a PC, a notebook computer, an ipad, and other terminals, and the upper computer is installed with indicom software.
In the embodiment, the lower computer combustion analyzer invicom acquires the pressure in the engine cylinder through the cylinder pressure sensor and displays the pressure on the invicom software to obtain the cylinder pressure signal.
And step S20, acquiring a compression top dead center position of a piston of a cylinder of the engine through the cylinder pressure sensor, and defining the top dead center position as 0 degree.
Specifically, the engine is cut off oil and is dragged to rotate by the dynamometer, the engine continuously performs four processes of air inlet, compression, expansion and air exhaust at the time, the gas in the cylinder is compressed in the compression process, therefore, oil supply and ignition do not work, and the pressure in the cylinder is the maximum at the compression top dead center. The lower computer combustion analyzer Inicom acquires the pressure in an engine cylinder through the cylinder pressure sensor, the indecom software has a top dead center searching function, the top dead center searching function key of the indecom is clicked, the indecom can automatically search the place with the maximum pressure value of the pressure curve, and the crank angle of the position is defined as 0 degree.
And step S30, the crankshaft position signal and the cylinder pressure signal are connected into the lower computer combustion analyzer, the lower computer combustion analyzer uploads signal data to the upper computer through the Ethernet, the upper computer displays the crankshaft position signal and the cylinder pressure signal, and the angle of the tooth missing position is measured, so that the timing measurement of the engine is realized.
As shown in fig. 3, fig. 3 is a schematic diagram of the relationship between the compression top dead center position of the first cylinder of the engine and the tooth-missing position of the signal gear plate of the crankshaft of the engine, where the compression top dead center of the first cylinder is 78 degrees after the falling edge of the first tooth after the tooth-missing.
The engine timing measuring method of the present invention is intended to measure an angle between a compression top dead center position and a tooth missing position of a first cylinder on an actual engine and confirm whether the two positions are the same as a design value.
As shown in fig. 4, the crank angle is measured by a goniometer and is displayed in a coordinate system (i.e., four angular coordinates, point 0 being the position of the compression top dead center of the first cylinder) as the x-axis of the coordinate system (i.e., the Y-axis is the pressure and the voltage, respectively).
Engine timing as referred to herein is the relative relationship between the missing tooth position and the first cylinder compression top dead center, i.e., the position of one cylinder compression top dead center on the crankshaft position signal. When the engine runs normally, the ECU (electronic control unit) of the engine can only determine the oil injection and ignition moments through the crankshaft position signal, so that the corresponding relation between the compression top dead center of one cylinder of the actual engine and the crankshaft position signal must be ensured.
In this embodiment, before the step of measuring the crank angle of the engine by the angle indicator, the method further includes:
and connecting the angle indicator, the cylinder pressure sensor and the crankshaft position sensor into the lower computer combustion analyzer.
The engine timing measurement system further includes a dynamometer, and the step of measuring the engine crank angle by the angle gage further includes, before the step of measuring the engine crank angle by the angle gage:
the engine was towed down to 2000 rpm by the dynamometer.
The engine timing measuring method has the beneficial effects that:
1. the timing relation is visually displayed by an angle-based curve, so that measurement, analysis, comparison and inspection are facilitated;
2. the existing equipment is tested by using the bench, the dynamometer is used for dragging the engine to rotate, the existing resources are effectively utilized, the labor intensity is reduced, the testing time is shortened, and the working efficiency is improved;
3. the angle marking instrument is adopted to measure the crank angle, the signals of the engine crank position sensor are directly collected, the tooth missing position of the crank signal is measured on software, and the measurement precision is improved.
In order to achieve the purpose, the invention further provides an engine timing measurement system which comprises a lower computer combustion analyzer, an angle indicator, a cylinder pressure sensor, a crankshaft position sensor, a dynamometer and an upper computer, wherein the upper computer is provided with Indicom software, and the angle indicator, the cylinder pressure sensor and the crankshaft position sensor are connected with the lower computer combustion analyzer.
The angle marking instrument is used for measuring the rotation angle of a crankshaft of the engine, the crankshaft position sensor is used for measuring the position of the crankshaft of the engine and outputting a position signal of the crankshaft of the engine, and the cylinder pressure sensor is used for measuring the pressure in an engine cylinder and outputting a cylinder pressure signal.
The cylinder pressure sensor is further used for acquiring the compression top dead center position of a piston of a cylinder of the engine, and the top dead center position is defined as 0 degree.
The lower computer combustion analyzer is used for collecting the engine crankshaft position signal and the cylinder pressure signal and uploading signal data to the upper computer through an Ethernet.
And the upper computer is used for displaying the crankshaft position signal and the cylinder pressure signal, measuring the tooth missing position and realizing the timing measurement of the engine.
The engine timing measurement system also includes a dynamometer for towing the engine down to 2000 revolutions per minute.
The engine timing measuring system has the beneficial effects that:
1. the timing relation is visually displayed by an angle-based curve, so that measurement, analysis, comparison and inspection are facilitated;
2. the existing equipment is tested by using the bench, the dynamometer is used for dragging the engine to rotate, the existing resources are effectively utilized, the labor intensity is reduced, the testing time is shortened, and the working efficiency is improved;
3. the angle marking instrument is adopted to measure the crank angle, the signals of the engine crank position sensor are directly collected, the tooth missing position of the crank signal is measured on software, and the measurement precision is improved.
To achieve the above object, the present invention further provides a computer readable storage medium storing an engine timing measurement program, which when executed by a processor performs the steps of the method as described above, and the description thereof is omitted here.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or flow transformations made by the present specification and drawings, or applied directly or indirectly to other related arts, are included in the scope of the present invention.
Claims (9)
1. An engine timing measurement method is characterized in that the method is applied to an engine timing measurement system, the system comprises a corner mark instrument, a cylinder pressure sensor, a crankshaft position sensor, a lower computer combustion analyzer and an upper computer, and the method comprises the following steps:
measuring the rotation angle of a crankshaft of the engine through the angle marking instrument, measuring the position of the crankshaft of the engine through the crankshaft position sensor and outputting a position signal of the crankshaft of the engine, and measuring the pressure in an engine cylinder through the cylinder pressure sensor and outputting a cylinder pressure signal;
acquiring a compression top dead center position of a piston of a cylinder of the engine through the cylinder pressure sensor, and defining the top dead center position as 0 degree;
the crankshaft position signal and the cylinder pressure signal are connected into the lower computer combustion analyzer, the lower computer combustion analyzer uploads signal data to the upper computer through the Ethernet, the crankshaft position signal and the cylinder pressure signal are displayed through the upper computer, the angle of the tooth missing position is measured, and the timing measurement of the engine is achieved.
2. The engine timing measurement method according to claim 1, characterized in that said step of measuring an engine crank angle by said goniometer further comprises:
and connecting the angle indicator, the cylinder pressure sensor and the crankshaft position sensor into the lower computer combustion analyzer.
3. The engine timing measurement method according to claim 1, wherein the engine timing measurement system further includes a dynamometer, and the step of measuring an engine crank angle by the angle gage further includes, before the step of:
the engine was towed down to 2000 rpm by the dynamometer.
4. The engine timing measurement method according to any one of claims 1 to 3, wherein Indicom software is installed on the upper computer.
5. An engine timing measurement system is characterized by comprising a lower computer combustion analyzer, an angle indicator, a cylinder pressure sensor, a crankshaft position sensor, a dynamometer and an upper computer;
the angle marking instrument is used for measuring the rotation angle of a crankshaft of the engine, the crankshaft position sensor is used for measuring the position of the crankshaft of the engine and outputting a position signal of the crankshaft of the engine, and the cylinder pressure sensor is used for measuring the pressure in an engine cylinder and outputting a cylinder pressure signal;
the cylinder pressure sensor is also used for acquiring the compression top dead center position of a piston of a cylinder of the engine, and the top dead center position is defined as 0 degree;
the lower computer combustion analyzer is used for acquiring the engine crankshaft position signal and the cylinder pressure signal and uploading signal data to the upper computer through an Ethernet;
and the upper computer is used for displaying the crankshaft position signal and the cylinder pressure signal, measuring the tooth missing position and realizing the timing measurement of the engine.
6. The engine timing measurement system of claim 5, wherein the vane gauge, cylinder pressure sensor, and crankshaft position sensor are coupled to the combustion analyzer.
7. The engine timing measurement system of claim 5, further comprising a dynamometer for towing the engine down to 2000 revolutions per minute.
8. The engine timing measurement system of claim 7, wherein the upper computer has installed thereon inducom software.
9. A computer-readable storage medium, characterized in that it stores an engine timing measurement program which, when executed by a processor, performs the steps of the method according to any one of claims 1 to 4.
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| CN202011047839.2A CN112213111A (en) | 2020-09-29 | 2020-09-29 | Engine timing measurement method and system and storage medium |
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| CN202011047839.2A CN112213111A (en) | 2020-09-29 | 2020-09-29 | Engine timing measurement method and system and storage medium |
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| CN112213111A true CN112213111A (en) | 2021-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933060A (en) * | 2021-09-08 | 2022-01-14 | 东风越野车有限公司 | Method and equipment for measuring zero reference angle of diesel engine |
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Application publication date: 20210112 |