CN113279856B - Engine valve timing phase measuring method - Google Patents
Engine valve timing phase measuring method Download PDFInfo
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- CN113279856B CN113279856B CN202110747116.1A CN202110747116A CN113279856B CN 113279856 B CN113279856 B CN 113279856B CN 202110747116 A CN202110747116 A CN 202110747116A CN 113279856 B CN113279856 B CN 113279856B
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- 238000001514 detection method Methods 0.000 claims description 11
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/082—Safety, indicating, or supervising devices relating to valves
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- Combustion & Propulsion (AREA)
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- Combined Controls Of Internal Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a method for measuring the valve timing of an engine, which comprises the following steps: the method comprises the following steps: after the sensors are installed, the axial angles of the air inlet valve and the air outlet valve and the deviation angles of the measuring axes of the corresponding sensors are measured, each sensor is connected with a signal acquisition board card, and the signal acquisition board card is connected with an upper computer; step two: data acquisition: starting an upper computer, and manually turning 10 circles to finish data acquisition; step three: the upper computer completes data processing and output: after initialization, collecting signals of the angle sensor, collecting two-phase orthogonal signals of the angle sensor by the signal collecting board card, counting the signals, wherein the Count value is Count, forward counting is conducted during forward rotation, reverse counting is conducted during reverse rotation, when the increase of the Count value is detected, lift range data are obtained, and after offset operation is conducted, acceleration of the intake valve, the exhaust valve and the valve wrap angle are calculated. The invention has the advantages that: the sensor is convenient to install, high in measurement efficiency and good in measurement accuracy.
Description
Technical Field
The invention relates to the technical field of engine valve timing measurement, in particular to a method for measuring the engine valve timing.
Background
In the processes of calibration, trial production and test of the engine, the valve timing of the engine needs to be measured and confirmed. Namely, the phase of the competitive product engine is measured to research the thermodynamic characteristics of the competitive product engine when the standard is aligned, and the gas distribution phase is required to be measured when the competitive product engine is manufactured in a trial mode, so that the processing precision of a trial-manufactured sample piece is ensured, and the effective performance of a subsequent test is ensured.
For the detection of the gas distribution phase, two methods are mainly adopted at present: 1. manually dotting, namely measuring the lift of the valve by using a dial indicator at regular rotating angles by adopting a manual mode and recording data; 2. the valve lift corresponding to each crank angle is quickly detected by adopting a valve timing detection system, and the valve lift detection system is related to patent applications such as application numbers CN201711195739.2, CN201120523911.4, CN201420820430.3 and the like.
However, in the above patent application, the valve timing detection system needs to have a measurement axis of a sensor (including a laser position sensor or an electronic micrometer) parallel to the valve axis when measuring the valve lift. In actual operation, if the light path of the laser sensor or the parallelism between the probe of the motor micrometer and the axis of the valve needs to be ensured, the sensor is probably interfered by a cam, a cam shaft, a rocker arm and other parts right above the valve, so that the installation difficulty of the sensor is high or the sensor cannot be installed, and the practicability of the system is greatly influenced.
In the above patent application, the engine is turned manually or by a motor dragging mode. The manual mode is adopted, so that the uneven turning speed is inevitably caused, the rotation angle measurement error of the crankshaft or the camshaft is easily caused by the reversion during the hand changing, and the acquisition precision is influenced; and the motor is adopted for dragging, so that the tool is complex and the universality is poor.
Disclosure of Invention
The invention aims to make up the defects, and discloses a method for measuring the valve timing of an engine, which is convenient to install, high in measurement efficiency and good in measurement accuracy, for a sensor to the society.
The technical scheme of the invention is realized as follows:
an engine valve timing measurement method comprises the following steps:
the method comprises the following steps: installing a sensor:
1) installing a distance sensor and an angle sensor, wherein the distance sensor comprises an intake valve lift sensor, an exhaust valve lift sensor and a piston stroke sensor;
2) measuring intake valve axis angle theta1Measuring the intake valve sensor axis angle theta2Take θ1And theta2The absolute value of the difference is used as the deviation angle theta of the air inlet valve axis and the air inlet valve sensor axis3；
3) Measuring exhaust valve axis angle theta4Measuring the axial angle theta of the exhaust valve sensor5Take θ4And theta5The absolute value of the difference is used as the deviation angle theta of the exhaust valve axis and the exhaust valve sensor axis6；
4) Each sensor is connected with a signal acquisition board card, and the signal acquisition board card is connected with an upper computer;
step two: data acquisition:
5) starting an upper computer to start detection;
6) manually turning, dragging an engine crankshaft or a camshaft to rotate for 10 circles, and automatically completing data acquisition work by the system;
step three: the upper computer completes data processing and output:
7) initializing, and enabling Count _ Prev = 0;
8) the signal acquisition board card acquires two-phase orthogonal signals of the angle sensor and counts the signals, the Count value is Count, forward counting is carried out when the angle sensor rotates forwards, and reverse counting is carried out when the angle sensor rotates backwards;
9) if and only if the Count value is larger than the Count _ Prev, triggering an intake valve lift sensor, an exhaust valve lift sensor and a piston stroke sensor to acquire data, and enabling the Count _ Prev value to be + 1;
10) repeating the step 8) and the step 9), completing 10-circle turning, and packaging and sending the acquired data to an upper computer;
11) the upper computer takes the data of 180 degrees before the top dead center of the first piston as the starting point of the available data, and divides the data into one group every 720 degrees to obtain 4 groups of complete data;
12) converting the collected voltage signals of the intake valve lift, the exhaust valve lift and the piston lift into lift data to enable the intake valve lift to be L1Exhaust valve lift of L2Piston lift of L5；
13) Performing offset operation on the lift data, setting the minimum lift to be 0 and the maximum lift to be positive;
14) calculating actual intake valve lift L3Exhaust valve lift L4The calculation formula is as follows: l is3= L1*cosθ3，L4= L2*cosθ6；
15) Averaging the 4 groups of data;
16) calculating the acceleration A1 of the intake valve and the acceleration A2 of the exhaust valve; the valve acceleration is equal to the lift difference corresponding to the front phase and the rear phase;
17) calculating the valve wrap angle theta9Detecting the phase theta corresponding to the 1mm lift of the valve ascending section7Detecting the phase theta corresponding to the 1mm lift of the descending section of the air valve8Wrap angle of valve theta9=θ8-θ7。
The measures for further optimizing the technical scheme are as follows:
as an improvement, the deviation angle theta between the inlet valve axis and the inlet valve sensor axis3Less than 25.
As an improvement, the deviation angle theta between the axis of the exhaust valve and the axis of the exhaust valve sensor6Less than 25.
As an improvement, the signal acquisition board card is connected with the upper computer through a USB.
As a refinement, the individual axis angles are measured with an inclinometer.
As an improvement, the resolution of the angle sensor is 1440 coils/turn.
As a modification, the angle sensor employs an encoder having A, B, Z three-phase output.
As an improvement, the distance sensor adopts a laser position sensor or an electronic micrometer.
Compared with the prior art, the invention has the advantages that:
according to the engine gas distribution phase measuring method, the parallelism of the measuring axis and the valve axis is not required to be ensured, the installation of the sensor is greatly facilitated, and the measuring efficiency can be effectively improved; in addition, the measurement method has a positive and negative rotation detection function, so that the problem of valve timing detection error caused by reverse rotation of the engine due to various problems when a tester turns the vehicle is solved, and the measurement accuracy can be improved.
Drawings
FIG. 1 is a measurement flow chart of a valve timing measurement method of the present invention;
FIG. 2 is a flowchart of the operation of the upper computer of the method for measuring the valve timing of the present invention;
FIG. 3 is a schematic view showing the installation of sensors in the valve timing measurement method of the present invention;
fig. 4 is a measurement schematic diagram of the valve lift of the valve timing measurement method of the present invention.
The names of the reference numbers in the drawings of the invention are as follows:
the device comprises an engine to be tested 1, a base 2, an intake valve lift sensor 3, an exhaust valve lift sensor 4, an inclinometer 5, a piston stroke sensor 6 and an angle sensor 7.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
an engine valve timing measurement method comprises the following steps:
the method comprises the following steps: installing a sensor:
1) installing a distance sensor and an angle sensor, wherein the distance sensor comprises an intake valve lift sensor, an exhaust valve lift sensor and a piston stroke sensor; as shown in fig. 3, an upper base 2 is fixed on an engine 1 to be tested, a piston stroke sensor 6 is installed on the base 2, an intake valve lift sensor 3 and an exhaust valve lift sensor 4 are correspondingly installed on two sides of the piston stroke sensor 6 by utilizing a magnetic seat, an angle sensor 7 is installed at a crankshaft of the engine 1 to be tested, the angle sensor 7 is used for measuring a rotating angle signal of the crankshaft or a camshaft, and the angle sensor 7 adopts an encoder with a resolution of 1440 coils/coil and A, B, Z three-phase output. The distance sensor adopts a laser position sensor or an electronic micrometer.
2) Measuring intake valve axis angle theta1Measuring the intake valve sensor axis angle theta2Take θ1And theta2The absolute value of the difference is used as the deviation angle theta of the air inlet valve axis and the air inlet valve sensor axis3(ii) a To improve the accuracy of the measurement, the deviation angle θ3Preferably less than 25.
3) Measuring exhaust valve axis angle theta4Measuring the axial angle theta of the exhaust valve sensor5Take θ4And theta5The absolute value of the difference is used as the deviation angle theta of the exhaust valve axis and the exhaust valve sensor axis6Likewise, to improve the accuracy of the measurement, the deviation angle θ6Preferably less than 25 °; the above-mentioned respective axis angles are measured using an inclinometer 5.
4) Each sensor is connected with a signal acquisition board card, and the signal acquisition board card is connected with an upper computer; the signal acquisition board card is connected with the upper computer through a USB.
Step two: data acquisition:
5) starting an upper computer to start detection;
6) manually turning, dragging an engine crankshaft or a camshaft to rotate for 10 circles, and automatically completing data acquisition work by the system;
step three: the upper computer completes data processing and output:
7) initializing, and enabling Count _ Prev = 0;
8) the signal acquisition board card acquires two-phase orthogonal signals of the angle sensor and counts the signals, the Count value is Count, forward counting is carried out when the angle sensor rotates forwards, and reverse counting is carried out when the angle sensor rotates backwards;
9) if and only if the Count value is larger than the Count _ Prev, triggering an intake valve lift sensor, an exhaust valve lift sensor and a piston stroke sensor to acquire data, and enabling the Count _ Prev value to be + 1;
10) repeating the step 8) and the step 9), completing 10-circle turning, and packaging and sending the acquired data to an upper computer;
11) the upper computer takes the data of 180 degrees before the top dead center of the first piston as the starting point of the available data, and divides the data into one group every 720 degrees to obtain 4 groups of complete data;
12) converting the collected voltage signals of the intake valve lift, the exhaust valve lift and the piston lift into lift data to enable the intake valve lift to be L1Exhaust valve lift of L2Piston lift of L5；
13) Performing offset operation on the lift data, setting the minimum lift to be 0 and the maximum lift to be positive;
14) calculating actual intake valve lift L3Exhaust valve lift L4The calculation formula is as follows: l is3=L1*cosθ3，L4= L2*cosθ6(ii) a As shown in FIG. 4, since the intake lift sensor and the movement axis of the intake valve are installed in a non-parallel manner, L measured by the stroke sensor cannot be directly used10、L11As the lift of the valve. Actual valve lift H10=（L11- L10）*cosθ10In practice, L may be added10=0, then H10= L11cosθ10。
15) For the 4 groups of intake valve lifts L calculated in the step 14)34 groups of exhaust valve lift L4Adding and averaging the data and 4 sets of piston lifts L in step 12)5Data is added and averaged;
16) calculating the acceleration A1 of the intake valve and the acceleration A2 of the exhaust valve; the valve acceleration is equal to the lift difference corresponding to the front and rear phases, taking the intake valve acceleration A1 as an example, A11deg = L2deg -L1deg，A12deg = L3deg -L2deg… … wherein L1degLift of intake valve corresponding to 1 degree of crank angle, L2degFor intake valve lift corresponding to 2 crank angle degrees, A11degIs an intake valve acceleration corresponding to 1 crank angle degree, so the intake valve acceleration A1 is A11deg、 A12deg……A1720degCombinations of (a) and (b). The exhaust valve acceleration A2 is calculated in the same manner as the intake valve acceleration A1.
17) Calculating the valve wrap angle theta9Detecting the phase theta corresponding to the 1mm lift of the valve ascending section7Detecting the phase theta corresponding to the 1mm lift of the descending section of the air valve8Wrap angle of valve theta9=θ8-θ7。
According to the engine gas distribution phase measuring method, the parallelism of the measuring axis and the valve axis is not required to be ensured, the installation of the sensor is greatly facilitated, and the measuring efficiency can be effectively improved; in addition, the measurement method has a positive and negative rotation detection function, so that the problem of valve timing detection error caused by reverse rotation of the engine due to various problems when a tester turns the vehicle is solved, and the measurement accuracy can be improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A method for measuring the valve timing of an engine is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: installing a sensor:
1) installing a distance sensor and an angle sensor, wherein the distance sensor comprises an intake valve lift sensor, an exhaust valve lift sensor and a piston stroke sensor;
2) measuring intake valve axis angle theta1Measuring the intake valve sensor axis angle theta2Take θ1And theta2The absolute value of the difference is used as the deviation angle theta of the air inlet valve axis and the air inlet valve sensor axis3；
3) Measuring exhaust valve axis angle theta4Measuring the axial angle theta of the exhaust valve sensor5Take θ4And theta5The absolute value of the difference is used as the deviation angle theta of the exhaust valve axis and the exhaust valve sensor axis6；
4) Each sensor is connected with a signal acquisition board card, and the signal acquisition board card is connected with an upper computer;
step two: data acquisition:
5) starting an upper computer to start detection;
6) manually turning, dragging an engine crankshaft or a camshaft to rotate for 10 circles, and automatically completing data acquisition work by the system;
step three: the upper computer completes data processing and output:
7) initializing, and enabling Count _ Prev = 0;
8) the signal acquisition board card acquires two-phase orthogonal signals of the angle sensor and counts the signals, the Count value is Count, forward counting is carried out when the angle sensor rotates forwards, and reverse counting is carried out when the angle sensor rotates backwards;
9) if and only if the Count value is larger than the Count _ Prev, triggering an intake valve lift sensor, an exhaust valve lift sensor and a piston stroke sensor to acquire data, and enabling the Count _ Prev value to be + 1;
10) repeating the step 8) and the step 9), completing 10-circle turning, and packaging and sending the acquired data to an upper computer;
11) the upper computer takes the data of 180 degrees before the top dead center of the first piston as the starting point of the available data, and divides the data into one group every 720 degrees to obtain 4 groups of complete data;
12) converting the collected voltage signals of the intake valve lift, the exhaust valve lift and the piston lift into lift data to enable the intake valve lift to be L1Exhaust valve lift of L2Piston lift of L5；
13) Performing offset operation on the lift data, setting the minimum lift to be 0 and the maximum lift to be positive;
14) calculating actual intake valve lift L3Exhaust valve lift L4The calculation formula is as follows: l is3= L1*cosθ3，L4= L2*cosθ6；
15) For the 4 groups of intake valve lifts L calculated in the step 14)34 groups of exhaust valve lift L4Adding and averaging the data and 4 sets of piston lifts L in step 12)5Data is added and averaged;
16) calculating the acceleration A1 of the intake valve and the acceleration A2 of the exhaust valve; the valve acceleration is equal to the lift difference corresponding to the front phase and the rear phase;
17) calculating the valve wrap angle theta9Detecting the phase theta corresponding to the 1mm lift of the valve ascending section7Detecting the phase theta corresponding to the 1mm lift of the descending section of the air valve8Wrap angle of valve theta9=θ8-θ7。
2. The engine valve timing measurement method according to claim 1, characterized in that: the deviation angle theta between the axis of the intake valve and the axis of the intake valve sensor3Less than 25.
3. The engine valve timing measurement method according to claim 1, characterized in that: the deviation angle theta between the exhaust valve axis and the exhaust valve sensor axis6Less than 25.
4. The engine valve timing measurement method according to claim 1, characterized in that: the signal acquisition board card is connected with the upper computer through a USB.
5. The engine valve timing measurement method according to claim 1, characterized in that: the respective axis angles are measured with an inclinometer.
6. The engine valve timing measurement method according to claim 1, characterized in that: the resolution of the angle sensor is 1440 coils/circle.
7. The engine valve timing measurement method according to claim 1, characterized in that: the angle sensor described employs an encoder with A, B, Z three-phase output.
8. The engine valve timing measurement method according to claim 1, characterized in that: the distance sensor adopts a laser position sensor or an electronic micrometer.
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| CN202110747116.1A CN113279856B (en) | 2021-07-02 | 2021-07-02 | Engine valve timing phase measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0754622A (en) * | 1993-08-10 | 1995-02-28 | Mitsubishi Heavy Ind Ltd | Detecting device for offset contact of exhaust valve |
| CN102564769B (en) * | 2012-01-16 | 2014-10-08 | 宁波市鄞州德来特技术有限公司 | Method for measuring gas distribution phase of engine |
| CN105444654A (en) * | 2015-12-10 | 2016-03-30 | 广西玉柴机器股份有限公司 | Valve-timing phase detection method for engine |
| CN105953692B (en) * | 2016-05-25 | 2018-08-14 | 重庆长安汽车股份有限公司 | A kind of valve lift measuring device and measurement method |
| CN110207994B (en) * | 2019-06-25 | 2020-08-07 | 重庆长安汽车股份有限公司 | Automatic measuring system for initial gas distribution phase of engine |
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