CN115077915B - Method for detecting position relation between top dead center of piston and crankshaft - Google Patents
Method for detecting position relation between top dead center of piston and crankshaft Download PDFInfo
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- CN115077915B CN115077915B CN202210726869.9A CN202210726869A CN115077915B CN 115077915 B CN115077915 B CN 115077915B CN 202210726869 A CN202210726869 A CN 202210726869A CN 115077915 B CN115077915 B CN 115077915B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 117
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 206010044048 Tooth missing Diseases 0.000 claims description 9
- 238000000611 regression analysis Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000009499 grossing Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
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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
- G01M15/02—Details or accessories of testing apparatus
-
- 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
-
- 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
- G01B21/02—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 length, width, or thickness
-
- 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
- G01M15/04—Testing internal-combustion engines
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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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Testing Of Engines (AREA)
Abstract
The invention provides a method for detecting the position relationship between a piston top dead center and a crankshaft, which comprises the following steps: a piston displacement measuring unit for measuring the piston displacement is arranged on the top surface of a piston of a tested cylinder, a crank angle measuring unit for measuring the crank angle is arranged on a crank shaft of a tested engine, the arranged piston displacement measuring unit, the crank angle measuring unit and a crank position measuring unit carried on the tested engine are connected with a signal acquisition card, and a test driving unit is used for connecting with the crank shaft of the tested engine; the signal acquisition card receives a piston displacement signal, a crank shaft position signal and a crank shaft rotation angle signal of a tested cylinder; the test computer determines the angle of the crankshaft of the tested engine from the position of the missing teeth of the crankshaft signal panel to the position of the piston of the tested cylinder reaching the top dead center for the first time based on the piston displacement signal, the crankshaft position signal and the crankshaft angle signal received by the signal acquisition card.
Description
Technical Field
The invention belongs to the field of automobile engine testing, and particularly relates to a method for detecting the position relationship between an engine piston top dead center and a crankshaft.
Background
Under the general aim of carbon neutralization, the engine is focused on in the research direction of environmental protection and energy conservation, so that the engine faces higher challenges in the capability of emission and fuel economy, and realizing more efficient combustion of the engine is one of effective means for solving the challenges, and in order to solve the challenges, the relationship between the top dead center of the piston and the position of the crankshaft is taken as a key factor for influencing combustion, and the industry puts forward higher requirements on the precise design of the relationship between the top dead center of the piston and the position of the crankshaft, so that a method for efficiently and accurately detecting is needed to solve whether the design and the assembly of the relationship between the top dead center of the piston and the position of the crankshaft meet the requirements or not.
Aiming at the method for detecting the assembly precision of the crank connecting rod mechanism of the engine, the patent CN202011610855.8 discloses a method and a system for detecting the deviation of the top dead center of the piston, which are used for driving the flywheel of the engine to rotate according to the preset rotating speed, the signal time interval between the top dead center of the piston and the top dead center of the flywheel is detected by a sensor, and then the rotating angle from the top dead center of the piston to the top dead center of the flywheel can be obtained through calculating the time interval according to the preset speed. For patent CN202110976284.8, a device and a method for measuring deviation of top dead center of a quick measuring piston are described, a mounting hole is processed on a cylinder cover of an engine to mount a measuring component, a displacement sensor is mounted on the measuring component to detect displacement of the piston and connect signals of the displacement sensor to an ECU of the engine, the ECU compares the top dead center detected by the sensor of the engine body with the top dead center detected by the actually mounted displacement sensor to determine the actual deviation, in the method, the mounting hole of the sensor is required to be mechanically mounted on the cylinder cover of the engine, the testing time is long, damage to the cylinder cover of the tested part is caused, and the popularization of the detecting means is difficult.
Against the background of the technology, the current industry lacks a rapid and high-precision method for detecting the position relationship between the top dead center of the engine piston and the crankshaft.
Disclosure of Invention
The invention provides a method for detecting the position relationship between the top dead center of a piston and a crankshaft, which can rapidly and accurately detect the position relationship between the top dead center of the piston of an engine and the crankshaft.
The technical scheme of the invention is as follows:
The invention provides a method for detecting the position relationship between a piston top dead center and a crankshaft, which comprises the following steps:
Selecting a cylinder to be tested on the engine to be tested;
A piston displacement measuring unit for measuring the piston displacement is arranged on the top surface of a piston of a tested cylinder, a crank angle measuring unit for measuring the crank angle is arranged on a crank shaft of a tested engine, the arranged piston displacement measuring unit, the crank angle measuring unit and a crank position measuring unit carried on the tested engine are connected with a signal acquisition card, a test driving unit is used for connecting with the crank shaft of the tested engine, a direct current stabilized power supply is connected with the piston displacement measuring unit, the crank angle measuring unit and the crank position measuring unit for supplying power, and a test computer is connected with the signal acquisition card;
the signal acquisition card receives a piston displacement signal, a crank shaft position signal and a crank shaft rotation angle signal of a tested cylinder;
The test computer determines the angle of the crankshaft of the tested engine from the position of the missing teeth of the crankshaft signal panel to the position of the piston of the tested cylinder reaching the top dead center for the first time based on the piston displacement signal, the crankshaft position signal and the crankshaft angle signal received by the signal acquisition card.
Preferably, the piston displacement measuring unit comprises a piston displacement sensor, the piston displacement sensor is arranged on a piston of the measured cylinder, a pointer of the piston displacement sensor is contacted with the top surface of the piston of the measured cylinder and moves along with the piston, and the piston displacement sensor detects the movement displacement of the piston in the measured cylinder and sends the movement displacement to the signal acquisition card.
Preferably, the crank angle measuring unit comprises an angular displacement sensor, wherein the angular displacement sensor is arranged on a crank shaft of the tested engine and synchronously rotates along with the crank shaft of the tested engine, and the angular displacement sensor identifies the angular displacement generated in the rotation process of the crank shaft of the tested engine and sends the angular displacement to the signal acquisition card.
Preferably, the step of determining, by the test computer, an angle by which the crankshaft of the tested engine rotates from the crankshaft signal disc tooth missing position to the piston of the tested cylinder reaching the top dead center position for the first time based on the piston displacement signal, the crankshaft position signal and the crankshaft angle signal received by the signal acquisition card includes:
Determining a first crank angular displacement signal voltage a1 corresponding to a crank signal disc tooth missing position of a detected engine detected by a crank position measuring unit;
the test computer takes the crank angle displacement acquired by the crank angle measuring unit as an abscissa, takes the piston displacement acquired by the piston displacement measuring unit as an ordinate, and draws a relation curve of the crank angle displacement and the piston displacement;
based on a drawn relation curve of the crank shaft angular displacement and the piston displacement of the cylinder to be tested, performing binomial regression analysis to obtain a unitary quadratic equation of the piston displacement of the cylinder to be tested;
determining a second crank shaft angular displacement signal voltage a2 corresponding to the first top dead center position of the piston of the tested cylinder according to the vertex coordinates of the unitary quadratic equation;
based on the first and second crank angular displacement signal voltages a1 and a2, an angle by which a crankshaft of the engine under test rotates from a crank signal disc tooth missing position to a position at which a piston of the cylinder under test reaches a top dead center for the first time is determined.
Preferably, the step of determining an angle by which the crankshaft of the engine under test rotates from the crankshaft signal disc tooth missing position to the piston of the cylinder under test first reaching the top dead center position based on the first crankshaft angular displacement signal voltage a1 and the second crankshaft angular displacement signal voltage a2 includes:
by the formula:
CA=（a2-a1）*n/m
And calculating the rotated angle CA of the crankshaft, wherein m is the corresponding crankshaft angular displacement signal voltage when the crankshaft rotates one circle, and n is the angle of the crankshaft rotating one circle.
The beneficial effects of the invention are as follows:
The method for detecting the position relationship between the top dead center of the piston of the engine and the crankshaft is rapid and has higher precision, and can detect the angle rotated by the crankshaft when the piston of the tested cylinder reaches the top dead center for the first time by taking the tooth missing position of the crankshaft signal disc as a starting point; the invention improves the accuracy of the test result according to the requirements of the current industry; the method is simple to operate and high in applicability, effectively improves the testing efficiency and is easy to popularize.
Drawings
FIG. 1 is a schematic diagram of a test system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of piston displacement versus crankshaft position data in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating steps of a piston displacement signal analysis algorithm according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a binomial fitting process of a piston displacement signal according to an embodiment of the present invention
FIG. 5 is a schematic diagram of the steps of the result algorithm according to the embodiment of the present invention.
Detailed Description
For better illustrating the objects and advantages of the present invention, a detailed description of the implementation and method of the technical solution of the present invention is given in conjunction with examples, and the embodiments described below are only some of the implementations, but the scope of protection of the present invention is not limited to the embodiments described below.
The invention provides a method for rapidly detecting the position relation between a top dead center of a piston and a crankshaft, which can detect the angle rotated by the crankshaft when the piston of a tested cylinder reaches the top dead center for the first time by taking the position of a missing tooth of a signal disc as a starting point.
The structure and principle of the test system are shown in the structure and principle diagram of the test system in fig. 1, wherein the structure comprises: 1-a direct current stabilized power supply; 2-a tested engine; 3-a piston displacement measurement unit; 4-a test driving unit; 5-a signal acquisition card; 6-testing a computer; 7-a crankshaft position measurement unit; 8-a crank angle measurement unit; it should be noted that the test drive unit 4 and the crank angle measurement unit 8 may be mounted at either end of the crankshaft, respectively, and are not limited to the mounting ends described in the present embodiment.
The detailed description of the above structure is as follows:
A piston displacement measuring unit 3 for converting the physical information of the displacement of the piston into an electric signal and outputting the electric signal to realize the detection of the position of the dead center on the piston, namely, the end point of the crank angle test; the piston displacement measuring unit 3 mainly comprises a piston displacement sensor and an installation tool thereof; after the piston displacement sensor is fixed through the installation of the tool, the pointer is tightly contacted with the top surface of the piston of the cylinder to be tested and moves along with the top surface of the piston, so that the displacement condition of the piston in the cylinder to be tested is detected in real time; the piston displacement signal in the cylinder to be tested is sent to the signal acquisition card 5 through the signal output line.
A test driving unit 4 for driving the crank-link mechanism of the engine 2 under test in the test process; mainly comprises a direct current motor assembly, a transmission belt pulley assembly, a connecting shaft tool and a fixed bracket.
The crankshaft position measuring unit 7 is used for detecting the missing tooth position of the crankshaft signal panel, namely the starting point of the crankshaft rotation angle test in the embodiment; the crankshaft position measuring unit 7 mainly comprises a crankshaft position sensor of the engine itself and a crankshaft signal panel; the crankshaft position sensor is a sensor for measuring the position and the rotating speed of a crankshaft signal panel of the engine and providing the signal for an ECU of the engine; the crank shaft position sensor is in a Hall type and a magnetoelectric type; the outer circumference of the engine crankshaft signal panel is divided into 60 equal parts, wherein the equal parts are composed of 58 continuous magnetic teeth and 2 tooth gaps; the crankshaft position sensor is arranged on the outer circumference side of the signal panel; the signal panel is arranged on the crankshaft or the flywheel to realize synchronous rotation with the crankshaft of the engine; the crank position sensor signal is sent to the signal acquisition card 5 through a signal output line.
It is to be understood that when the engine crankshaft position sensor is Hall type, the signal output of the sensor is not limited by the speed of rotation, and the driving speed of the driving device is not limited; when the engine crankshaft position sensor is magnetoelectric, the signal output of the sensor is limited by the speed of rotation, and the rotation speed of the driving device is required to be set according to the working requirement of the sensor.
A crank angle measuring unit 8 for converting the crank angle physical information into an electric signal and outputting the electric signal to measure the crank angle, and recording the angle rotated by the crank from the position of the missing teeth of the crank signal disc to the position when the piston of the tested cylinder reaches the top dead center for the first time; the crank angle measuring unit 8 mainly comprises an angular displacement sensor and an installation tool; the angular displacement sensor and the crankshaft are coaxially fixed through the mounting tool, so that the shaft of the angular displacement sensor and the crankshaft synchronously rotate; the signal of the angular displacement sensor is sent to the signal acquisition card through the signal output line.
Synchronous acquisition of a crankshaft position signal, a piston displacement signal and an angular displacement signal is realized through the signal acquisition card 5; the crank shaft position sensor, the piston displacement sensor and the angular displacement sensor are powered by a direct current stabilized power supply 1; the tested engine crankshaft is driven by the test driving unit 4; the graphic visualization and the data post-processing of the test process data are realized through the test computer 6 and the test software;
Based on the structure, the test principle of the invention is as follows: the tested engine 2 is an engine crankcase assembly (assembly of a crank-link mechanism is completed) or a standby engine; detecting a crank position signal of the detected engine by a crank position measuring unit 7; the piston displacement of the tested engine is detected by a piston displacement measuring unit 3; the crank angle measuring unit 8 is used for detecting signals of the rotation angle of the crank shaft of the tested engine; synchronous power supply is carried out on a crank shaft position sensor, a piston displacement sensor and a crank shaft angular displacement sensor through a direct current stabilized power supply 1; the crankshaft of the tested engine is driven to rotate through the test driving unit 4; synchronously acquiring a crankshaft position signal, a piston displacement signal and a crankshaft rotation angle signal through a signal acquisition card 5; the test data is processed and calculated by the test computer 6, and the detection result of the relation between the top dead center of the piston and the position of the crankshaft is shown in the schematic diagram of the piston displacement and the position data of the crankshaft in fig. 2.
The processing calculation of the data contains high-precision processing and algorithm to ensure the accuracy of the result, the processing of the piston displacement signal data is carried out as shown in fig. 3, and the operation steps are as follows:
step S101: performing low-pass filtering and smoothing on the piston displacement signal to remove noise in the signal acquisition process;
step S102: drawing an angle-piston displacement curve by taking a crank shaft angle displacement signal as an abscissa and a piston displacement signal as an ordinate;
step S103: performing binomial regression analysis on the signal in the step S102 to obtain a unitary quadratic equation of the piston displacement signal;
Step S104: obtaining an inflection point value of the piston of the tested cylinder reaching the top dead center for the first time according to the vertex coordinates of the unitary quadratic equation, namely a signal value of the piston of the tested cylinder reaching the top dead center for the first time, as shown in a binomial fitting processing schematic diagram of the piston displacement signal in fig. 4;
After step S101 to step S104 are completed, the calculation of the result data is performed, as shown in the step schematic diagram of the result algorithm in fig. 5, to obtain the result of the angle rotated by the crankshaft from the crankshaft signal mark position (i.e. the position of the missing teeth of the crankshaft signal disc) to the moment when the piston of the tested cylinder reaches the top dead center for the first time.
Step S201: and (3) performing signal filtering processing on the angular displacement sensor, removing noise in the signal acquisition process, and performing low-pass filtering and smoothing processing on the signal of the crank angular displacement sensor.
Step S202: and (3) filtering the crank shaft position sensor, removing noise in the signal acquisition process, and performing low-pass filtering and smoothing on the signal of the crank shaft position sensor.
Step S203: and processing the piston displacement signal according to the steps S101 to S104 to obtain a crank angle displacement signal value corresponding to the position of the piston of the cylinder to be tested reaching the top dead center for the first time.
Step S204: the signal of step S202 is found out the first crank angular displacement signal voltage a1 corresponding to the missing tooth position of the crank signal disc, and the piston displacement signal extremum of step S203 is found out the corresponding second crank angular displacement signal voltage a2.
Step S205: the result is calculated, and through the operation of the steps, an actual measurement value CA of the angle rotated by the crankshaft from the tooth missing position of the crankshaft signal disc to the moment of the top dead center of the piston can be obtained, wherein the formula is as follows:
Ca= (second crank angular displacement signal voltage a 2-first crank angular displacement signal voltage a 1) ×n/m
Wherein n is the angle of one rotation of the crankshaft, and m is the angular displacement signal voltage acquired by the angular displacement sensor when the crankshaft rotates one rotation.
Claims (3)
1. A method of detecting a positional relationship between a top dead center of a piston and a crankshaft, comprising:
selecting a cylinder to be tested on the engine (2) to be tested;
A piston displacement measuring unit (3) for measuring the piston displacement is arranged on the top surface of a piston of a tested cylinder, a crank angle measuring unit (8) for measuring the crank angle is arranged on a crank shaft of a tested engine (2), the arranged piston displacement measuring unit (3), the crank angle measuring unit (8) and a crank position measuring unit (7) carried on the tested engine (2) are connected with a signal acquisition card (5), a test driving unit (4) is used for connecting with the crank shaft of the tested engine (2), a direct current stabilized voltage supply (1) is connected with the piston displacement measuring unit (3), the crank angle measuring unit (8) and the crank position measuring unit (7) for supplying power, and a test computer (6) is connected with the signal acquisition card (5);
The test driving unit (4) is controlled to drive a crankshaft of the tested engine (2) to rotate, and the signal acquisition card (5) receives a piston displacement signal, a crankshaft position signal and a crankshaft rotation angle signal of the tested cylinder;
The testing computer (6) determines the angle of the crankshaft of the tested engine (2) from the position of the missing teeth of the crankshaft signal disc to the position of the piston of the tested cylinder reaching the top dead center for the first time based on the piston displacement signal, the crankshaft position signal and the crankshaft angle signal received by the signal acquisition card (5);
the step of determining the angle rotated by the crankshaft of the tested engine from the position of the missing teeth of the crankshaft signal panel to the position of the piston of the tested cylinder reaching the top dead center for the first time based on the piston displacement signal, the crankshaft position signal and the crankshaft angle signal received by the signal acquisition card (5) by the test computer (6) comprises the following steps:
Determining a first crank angular displacement signal voltage a1 corresponding to a crank position measuring unit (7) when the crank signal panel of the tested engine detects the tooth missing position;
The test computer (6) takes the crank angle displacement acquired by the crank angle measuring unit (8) as an abscissa, takes the piston displacement acquired by the piston displacement measuring unit (3) as an ordinate, and draws a relation curve of the crank angle displacement and the piston displacement;
based on a drawn relation curve of the crank shaft angular displacement and the piston displacement of the cylinder to be tested, performing binomial regression analysis to obtain a unitary quadratic equation of the piston displacement of the cylinder to be tested;
determining a second crank shaft angular displacement signal voltage a2 corresponding to the first top dead center position of the piston of the tested cylinder according to the vertex coordinates of the unitary quadratic equation;
Determining an angle through which a crankshaft of the tested engine (2) rotates from a crankshaft signal disc tooth missing position to a position at which a piston of the tested cylinder reaches a top dead center for the first time based on the first crankshaft angular displacement signal voltage a1 and the second crankshaft angular displacement signal voltage a 2;
the step of determining an angle by which a crankshaft of the engine (2) under test rotates from a crankshaft signal disc tooth missing position to a piston of the cylinder under test reaches a top dead center position for the first time based on the first crankshaft angular displacement signal voltage a1 and the second crankshaft angular displacement signal voltage a2 comprises:
by the formula:
CA=（a2-a1）*n/m
And calculating the rotated angle CA of the crankshaft, wherein m is the corresponding crankshaft angular displacement signal voltage when the crankshaft rotates one circle, and n is the angle of the crankshaft rotating one circle.
2. Method for detecting the position relationship between the piston top dead center and the crankshaft according to claim 1, characterized in that the piston displacement measuring unit (3) comprises a piston displacement sensor, the piston displacement sensor is mounted on the piston of the cylinder under test, the pointer of the piston displacement sensor is in contact with the top surface of the piston of the cylinder under test and follows the movement of the piston, the piston displacement sensor detects the movement displacement of the piston in the cylinder under test, and the movement displacement is sent to the signal acquisition card (5).
3. Method for detecting the relationship between the top dead center and the crankshaft position of a piston according to claim 1, characterized in that the crank angle measuring unit (8) comprises an angular displacement sensor, which is mounted on the crankshaft of the engine under test and rotates synchronously with the crankshaft of the engine under test, the angular displacement sensor recognizing the angular displacement produced during the rotation of the crankshaft of the engine under test, and sending it to the signal acquisition card.
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| CN202210726869.9A CN115077915B (en) | 2022-06-24 | 2022-06-24 | Method for detecting position relation between top dead center of piston and crankshaft |
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| CN202210726869.9A CN115077915B (en) | 2022-06-24 | 2022-06-24 | Method for detecting position relation between top dead center of piston and crankshaft |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065933A (en) * | 1991-04-13 | 1992-11-04 | 成都科技大学 | Upper dead center automatic detecting-positioning method and equipment |
| CN110207994A (en) * | 2019-06-25 | 2019-09-06 | 重庆长安汽车股份有限公司 | A kind of initial port timing automatic measurement system of engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008075584A (en) * | 2006-09-22 | 2008-04-03 | Uzushio Electric Co Ltd | Combustion state analysis device and combustion state analysis system |
| KR101061290B1 (en) * | 2011-04-04 | 2011-08-31 | 유강주 | Engine power measurement system and its measuring method |
| JP2013007359A (en) * | 2011-06-27 | 2013-01-10 | Denso Corp | Engine control device |
| DE102014016416B4 (en) * | 2014-11-04 | 2018-06-28 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Method for determining the stroke position of a piston in the cylinder of a reciprocating internal combustion engine |
| JP7303497B2 (en) * | 2020-02-28 | 2023-07-05 | マツダ株式会社 | TOP DEAD CENTER POSITION EVALUATION METHOD AND TOP DEAD CENTER POSITION EVALUATION DEVICE |
| CN112213110A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Method and system for measuring phase of driving cam of high-pressure oil pump of gasoline engine and storage medium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065933A (en) * | 1991-04-13 | 1992-11-04 | 成都科技大学 | Upper dead center automatic detecting-positioning method and equipment |
| CN110207994A (en) * | 2019-06-25 | 2019-09-06 | 重庆长安汽车股份有限公司 | A kind of initial port timing automatic measurement system of engine |
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