CN112097710B - Method and device for measuring valve lift - Google Patents
Method and device for measuring valve lift Download PDFInfo
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- CN112097710B CN112097710B CN202011005861.0A CN202011005861A CN112097710B CN 112097710 B CN112097710 B CN 112097710B CN 202011005861 A CN202011005861 A CN 202011005861A CN 112097710 B CN112097710 B CN 112097710B
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- 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
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Abstract
The invention discloses a measuring method and a measuring device for valve lift, which utilize trigonometric function to obtain the inclined included angle of a measuring head of a contact type displacement sensor; measuring a reading corresponding to the valve lift through a contact type displacement sensor to be a valve reference lift Ha; the method comprises the steps of establishing a relation and obtaining the valve lift Hb by utilizing a trigonometric function of an included angle of the step a4 between the valve lift Hb and the valve reference lift Ha, setting a reference plane and combining a detection plane, and obtaining the inclination angle of a sensor measuring head by utilizing the trigonometric function relation, so that the final result is corrected, the detection precision is improved under the condition of not changing the detection principle, the working efficiency is improved, accurate basic data is provided for mapping a cam profile or drawing a phase diagram of an intake valve and an exhaust valve of the engine, and the efficient and stable operation of the engine is finally ensured.
Description
Technical Field
The invention relates to a detection and measurement process of an engine, in particular to a measurement method and a measurement device of a valve lift.
Background
When a cam profile is mapped or an intake and exhaust valve phase diagram of an engine is drawn, the lift of the intake and exhaust valves is necessarily detected, and the detection result of the lift of the intake and exhaust valves directly influences some basic data in the manufacturing process of the engine, and finally influences the normal and efficient operation of the engine.
In the prior art, there are two types of detection technologies for detecting the valve lift range in a relatively common way: the first method is that a crankshaft is manually rotated, a dial indicator is used for measuring the lift of an air valve (the dial indicator is perpendicular to an air valve detection plane as much as possible, and the plane is perpendicular to the movement direction of the air valve), test data are manually recorded, an angle dial is fixed on a crankcase body, a scale is arranged on the crankshaft, and finally a phase diagram is drawn; another method commonly used is to measure the valve lift by a displacement sensor (the installation of the displacement sensor depends on the verticality between the displacement sensor and a valve under manual control), and a crankshaft is driven by a manual mode or a motor; and combining the crankshaft with an angle sensor, processing the test data of the angle sensor and the displacement sensor by using computer software, and generating a gas distribution phase diagram.
In both of the two testing methods, the testing tools (the dial indicator and the displacement sensor) are manually controlled to perform measurement, the situation that the measuring head is perpendicular to the detection plane of the valve cannot be guaranteed, so that the measuring error exists, and finally the top dead center of the gas distribution phase cannot be accurately determined, so that the operation of the whole engine can be influenced.
Therefore, the existing valve lift detection process needs to be improved, the detection precision is improved under the condition of not changing the detection principle, the working efficiency is improved, accurate basic data are provided for mapping cam profiles or drawing intake and exhaust valve phase diagrams of the engine, and the efficient and stable operation of the engine is finally ensured.
Disclosure of Invention
In view of the above, the present invention provides a method and a device for measuring a valve lift, which improve the detection accuracy and the working efficiency without changing the detection principle, provide accurate basic data for mapping a cam profile or drawing a phase diagram of an intake valve and an exhaust valve of an engine, and finally ensure efficient and stable operation of the engine.
The invention relates to a method for measuring valve lift, which comprises the following steps:
a. installing a contact type displacement sensor and determining an inclined included angle of a measuring head of the contact type displacement sensor;
a1 setting the measuring tip of the probe at a set position where the distance between the measuring tip and the valve detecting plane in the probe moving direction is S1;
a2 setting another reference plane at a set height H from the valve detection plane, the reference plane being parallel to the valve detection plane;
a3, the distance between the measuring end and the reference plane in the movement direction of the measuring head S2;
a4, acquiring the inclined included angle of the measuring head of the contact type displacement sensor by utilizing a trigonometric function;
b. measuring valve lift
Contacting a measuring end of a measuring head of the contact type displacement sensor in the step a with a valve detection plane to measure a reading corresponding to the valve lift as a valve reference lift Ha;
and establishing a relation between the valve lift Hb and the valve reference lift Ha through a trigonometric function of the included angle of the step a4, and acquiring the valve lift Hb.
In the scheme, a corrected included angle between a contact type displacement sensor measuring head (the measuring head is generally rod-shaped and provided with a detecting end head and can be extended and contracted along the longitudinal direction and measure the moving distance) and a valve detecting plane is obtained by using the other plane which is parallel to the detecting plane and is set with the distance; the corrected included angle can be an included angle between the measuring head and the detection plane or an included angle between the measuring head and the valve rod, an included angle value can be obtained through the trigonometric function relation of the distances, and the included angle value is used for correcting errors caused by the inclination of the measuring head when the lift is measured, so that the lift of the valve can be measured accurately; of course, different trigonometric function relationships can be adopted according to different obtained included angles, so that basic correction data can be accurately provided for final results, and further description is omitted here.
Further, in step a4, the inclined included angle is an inclined included angle α between a measuring head of the contact type displacement sensor and the valve detection plane;
then
In the step (b), the step (c),
the valve lift Hb is Ha sin α.
The inclined included angle is the inclined included angle alpha between the measuring head and the valve detection plane, so that the included angle value can be visually acquired, and the calculation process is simplified.
Further, in the step a, the valve detection plane is a plane perpendicular to the valve movement direction, and the valve detection plane is synchronous with the valve when the valve moves; the valve detection plane may be the plane that any component has with the valve stem has synchronous motion, but the plane needs to be perpendicular to the direction of motion of the valve stem to provide a hardware basis for accurate data acquisition.
Further, the valve detection plane is selected as a top plane of a valve spring seat; the valve spring seat is used for supporting the spring and has a top surface perpendicular to the valve stem, which can avoid driving parts such as a camshaft and the like, so that the measurement and the movement do not interfere.
Further, the reference plane is arranged on a measuring block, the measuring block is provided with a bottom plane parallel to the reference plane and is placed on the valve detection plane through the bottom plane; when the measuring block is used, the measuring block is directly placed on the valve detection plane, so that the use is simple and convenient, and the valve lift detection efficiency is improved; the gauge blocks may be rectangular blocks, trapezoidal blocks for stable placement, etc., and are not described herein.
The invention has the beneficial effects that: the measuring method and the measuring device for the valve lift are provided with the reference plane and are combined with the detection plane, and the inclination angle of the measuring head of the sensor is obtained by utilizing the trigonometric function relation, so that the final result is corrected, the detection precision is improved under the condition of not changing the detection principle, the working efficiency is improved, accurate basic data are provided for surveying and mapping a cam profile or drawing a phase diagram of an intake valve and an exhaust valve of an engine, and the efficient and stable operation of the engine is finally ensured.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic diagram of a detection structure according to the present invention.
Detailed Description
The method for measuring the valve lift of the embodiment comprises the following steps:
a. installing a contact type displacement sensor and determining an inclined included angle of a measuring head 1 of the contact type displacement sensor;
a1 setting the measuring tip of the probe 1 to a set position where the distance S1 between the measuring tip and the valve detecting plane in the probe moving direction;
a2 providing another reference plane at a set height H from the valve detection plane 3, said reference plane being parallel to the valve detection plane;
a3, the distance between the measuring end and the reference plane in the movement direction of the measuring head S2;
a4, acquiring the inclined included angle of the measuring head of the contact type displacement sensor by utilizing a trigonometric function; at this time, if the included angle exists, S1-S2 becomes the hypotenuse of the triangle, H is one of the right-angle sides, and the inclination angle of the measuring head can be determined through the trigonometric function relation;
b. measuring valve lift
Contacting a measuring end of a measuring head of the contact type displacement sensor in the step a with a valve detection plane to measure a reading corresponding to the valve lift as a valve reference lift Ha;
establishing a relation by utilizing a trigonometric function of an included angle of the step a4 between the valve lift Hb and the valve reference lift Ha and acquiring the valve lift Hb;
in the scheme, as shown in the figure, a corrected included angle between a contact type displacement sensor measuring head (generally in a rod shape and provided with a detection end head, and capable of extending and retracting along the longitudinal direction and measuring the moving distance) and a valve detection plane is obtained by using the other plane which is parallel to the detection plane 3 and is set with the distance; the corrected included angle can be an included angle between the measuring head and the detection plane, and can also be an included angle between the valve rod and the valve rod because the valve rod (axis) is perpendicular to the detection plane; the included angle value is used for correcting errors caused by the inclination of the measuring head when the lift is measured, so that the valve lift can be measured accurately; of course, according to the difference of the obtained included angles, different trigonometric functions (sine or cosine) relations can be adopted, so that basic correction data can be accurately provided for the final result, and further description is omitted; the included angle herein refers to an included angle between the axis and the plane or between the axis and the axis, for example, the included angle between the measuring head and the detection plane refers to an included angle between the axis of the measuring head and the detection plane, and is not described herein again.
The set position of the measuring end can be determined by controlling the position of a measuring head of the sensor, and is not described herein again;
the detection plane 3 of the valve refers to a plane which follows the valve rod in the axial direction, and may be additionally arranged, or may be a valve component, such as an upper plane of a spring seat, and the like, and is not described herein again; the reference plane can be any settable plane parallel to the detection plane 3 of the valve, for example, a plane supported by the bracket or a plane on a block-shaped component can achieve the purpose of the invention, and is not described herein again; the arrangement orientation of the reference plane is not obviously restricted, and the reference plane is required to have a set distance and be parallel and can obtain a position parameter S2 through the displacement sensor; under general conditions, in order to facilitate the detection process and adapt to the engine structure, the displacement sensor is generally arranged above the valve, and the reference plane is located between the displacement sensor and the detection plane.
In this embodiment, in step a4, the inclined included angle is an inclined included angle α between a measuring head of the contact displacement sensor and the valve detection plane;
then
In the step (b), the step (c),
the valve lift Hb is Ha sin α.
The inclined included angle is the inclined included angle alpha between the measuring head and the valve detection plane, so that the included angle value can be visually acquired, and the calculation process is simplified.
In this embodiment, in step a, the valve detection plane 3 is a plane perpendicular to the valve movement direction, and the valve detection plane is synchronous with the valve when the valve moves; the valve detection plane may be the plane that any component has with the valve stem has synchronous motion, but the plane needs to be perpendicular to the direction of motion of the valve stem to provide a hardware basis for accurate data acquisition.
In this embodiment, the valve detection plane 3 is selected as a top plane of a valve spring seat; the valve spring seat is positioned at the upper part of the valve rod, is used for supporting the spring and is provided with a top surface vertical to the valve rod, and the top surface can avoid driving parts such as a camshaft and the like so that the measurement and the movement are not interfered; the valve spring seat and mounting structure are prior art and their construction will not be described in detail herein.
In this embodiment, the reference plane is disposed on a gauge block 2, and the gauge block 2 has a bottom plane parallel to the reference plane and is placed on the valve detection plane through the bottom plane; when the measuring block is used, the measuring block is directly placed on the valve detection plane, so that the use is simple and convenient, and the valve lift detection efficiency is improved; the gauge blocks may be rectangular blocks, trapezoidal blocks for stable placement, etc., and are not described herein.
The invention also discloses a measuring device of the valve lift, which comprises a contact type displacement sensor and a reference measuring piece with a reference plane, wherein the reference plane is arranged in parallel to the detection plane 3 of the valve when in use, and has a set distance in height; the detection plane 3 of the valve refers to a plane which follows the valve rod in the axial direction, and may be additionally arranged, or may be a valve component, such as an upper plane of a spring seat, and the like, and is not described herein again; the reference plane may be any settable plane parallel to the valve detection plane 3, for example, a plane supported by the bracket or a plane provided on a block-shaped component, which can achieve the purpose of the invention and is not described herein again.
In this embodiment, the reference measuring component is a gauge block 2, the reference plane is located on the gauge block 2, and the gauge block further has a bottom plane for placing on the detection plane; adopt gauge block structure, overall structure stability is good, and it is also comparatively convenient to use.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. A method for measuring a valve lift is characterized in that: the method comprises the following steps:
a. installing a contact type displacement sensor and determining an inclined included angle of a measuring head of the contact type displacement sensor;
a1 setting the measuring tip of the probe at a set position where the distance between the measuring tip and the valve detecting plane in the probe moving direction is S1;
a2 setting another reference plane at a set height H from the valve detection plane, the reference plane being parallel to the valve detection plane;
a3, the distance between the measuring end and the reference plane in the movement direction of the measuring head S2;
a4, acquiring the inclined included angle of the measuring head of the contact type displacement sensor by utilizing a trigonometric function;
b. measuring valve lift
Contacting a measuring end of a measuring head of the contact type displacement sensor in the step a with a valve detection plane to measure a reading corresponding to the valve lift as a valve reference lift Ha;
establishing a relation by utilizing a trigonometric function of an included angle of the step a4 between the valve lift Hb and the valve reference lift Ha and acquiring the valve lift Hb;
in the step a4, the inclined included angle is an inclined included angle alpha between a measuring head of the contact type displacement sensor and the valve detection plane;
then
In the step (b), the step (c),
the valve lift Hb is Ha sin α.
2. The method of determining a valve lift according to claim 1, characterized in that: in the step a, the valve detection plane is a plane perpendicular to the valve movement direction, and the valve detection plane is synchronous with the valve when the valve moves.
3. The method of determining a valve lift according to claim 2, characterized in that: the valve detection plane is selected as a top plane of the valve spring seat.
4. The method of determining a valve lift according to claim 1, characterized in that: the reference plane is arranged on a gauge block, the gauge block is provided with a bottom plane parallel to the reference plane and is placed on the valve detection plane through the bottom plane.
5. A device for determining the lift of a valve, characterized in that it comprises a contact-type displacement sensor and a reference measuring member having a reference plane which, in use, is arranged parallel to the detection plane of the valve and has a set distance in height.
6. A valve lift determination apparatus as claimed in claim 5, wherein said reference measurement member is a gauge block, said reference plane being located on said gauge block, said gauge block further having a bottom plane for placement on a detection plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011005861.0A CN112097710B (en) | 2020-09-22 | 2020-09-22 | Method and device for measuring valve lift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011005861.0A CN112097710B (en) | 2020-09-22 | 2020-09-22 | Method and device for measuring valve lift |
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| CN112097710A CN112097710A (en) | 2020-12-18 |
| CN112097710B true CN112097710B (en) | 2022-04-08 |
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| CN202011005861.0A Active CN112097710B (en) | 2020-09-22 | 2020-09-22 | Method and device for measuring valve lift |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113983899B (en) * | 2021-11-22 | 2024-03-19 | 中国第一汽车股份有限公司 | Method for testing variable valve lift mechanism |
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| KR101209742B1 (en) * | 2010-11-04 | 2012-12-07 | 기아자동차주식회사 | Valvelift devition compensating method for cvvl mounted engines |
| CN107884194A (en) * | 2017-11-07 | 2018-04-06 | 西华大学 | A kind of big valve stroke measurement and knock-on test device and method |
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2020
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| CN104251777A (en) * | 2014-09-19 | 2014-12-31 | 西安交通大学 | Device and method for detecting combined errors of engine valves |
| CN108036699A (en) * | 2017-11-24 | 2018-05-15 | 重庆长安汽车股份有限公司 | A kind of measuring system of continuously variable valve lift and port timing |
| CN109029201A (en) * | 2018-08-22 | 2018-12-18 | 安徽江淮汽车集团股份有限公司 | Valve lift measuring device |
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