CN113983899B - Method for testing variable valve lift mechanism - Google Patents
Method for testing variable valve lift mechanism Download PDFInfo
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- CN113983899B CN113983899B CN202111390057.3A CN202111390057A CN113983899B CN 113983899 B CN113983899 B CN 113983899B CN 202111390057 A CN202111390057 A CN 202111390057A CN 113983899 B CN113983899 B CN 113983899B
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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Abstract
The invention provides a method for testing a variable valve lift mechanism, which comprises the following steps: at least one time of adjustment is carried out on the lift value of the valve by operating the variable valve lift mechanism, and each time of adjustment of the lift value of the valve, the phase value of a camshaft is calculated, wherein the camshaft is used for driving the valve; comparing the calculated phase value with a theoretical phase value of a lift value of a corresponding valve to judge whether the variable valve lift mechanism is normal, wherein when the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve, the valve lift mechanism is determined to be in a normal state, and when the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve, the variable valve lift mechanism is determined to be in an abnormal state. By adopting the technical scheme, the problem that the variable valve lift mechanism is difficult to test in the prior art is effectively solved.
Description
Technical Field
The invention relates to the technical field of variable valve lift mechanisms, in particular to a method for testing a variable valve lift mechanism.
Background
The traditional engine valve mechanism has the advantages that the valve lift is fixed, so that a user still uses a large valve lift when waiting for a traffic light or controlling the engine to be in a low-speed and low-load state by the user, waste is generated in air inflow and oil mass, the optimization of engine performance and emission cannot be realized, and the use cost of the user is increased. Compared with the traditional valve actuating mechanism, the continuous variable valve lift actuating mechanism can provide proper valve lift according to actual needs under the rotating speed and load of the whole working range of the engine.
The variable valve lift actuating mechanism can realize the timely adjustment of the timing through the combination of the variable valve timing technology, so that the intake and exhaust performances of the engine are improved, the requirements of the engine on dynamic performance, economy and emission under the conditions of different rotating speeds and different loads are better met, the effect especially in the aspect of oil saving is more remarkable, and under the condition that the fuel consumption regulation is more and more severe, the engine loading variable valve lift actuating mechanism is already a mainstream trend.
However, the existing variable valve actuation mechanisms still have limitations. After the variable valve lift mechanism is loaded on the engine, the mounting effect is often difficult to determine, and when the variable valve lift mechanism fails, the variable valve lift mechanism is difficult to troubleshoot, so that a method for simply and conveniently testing the variable valve actuating mechanism is needed.
Disclosure of Invention
The invention mainly aims to provide a method for testing a variable valve lift mechanism, which aims to solve the problem that a variable valve actuating mechanism cannot be rapidly tested in the prior art.
To achieve the above object, according to one aspect of the present invention, there is provided a method of testing a variable valve lift mechanism, the method comprising: at least one time of adjustment is carried out on the lift value of the valve by operating the variable valve lift mechanism, and each time of adjustment of the lift value of the valve, the phase value of a camshaft is calculated, wherein the camshaft is used for driving the valve; comparing the calculated phase value with a theoretical phase value of a lift value of a corresponding valve to judge whether the variable valve lift mechanism is normal, wherein when the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve, the valve lift mechanism is determined to be in a normal state, and when the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve, the variable valve lift mechanism is determined to be in an abnormal state.
Further, before operating the variable valve lift mechanism to adjust the lift value of the valve includes: and connecting a measuring part of the dial indicator with the valve, wherein the measuring part is used for measuring the lift value of the valve.
Further, the method of calculating the phase value of the camshaft includes: selecting a plurality of test point groups on the contour line of the cam shaft; calculating the phase value of each test point group; and taking the average value of the phase values of the plurality of test point groups as the final phase value of the camshaft.
Further, the camshaft comprises a rising edge and a falling edge, and the method for selecting a plurality of test point groups on the contour line of the camshaft comprises the following steps: and selecting a first test point at the rising edge, selecting a second test point at the falling edge, wherein the first test point and the second test point are symmetrical about the geometric center line of the cam shaft, and taking the first test point and the second test point as a first test point group.
Further, the method for calculating the phase value of each test point group comprises the following steps: the measuring head of the measuring device is abutted with the cam shaft, a point on the measuring head, abutted with the cam shaft, is used as a datum point, and the cam shaft is rotated for one circle; measuring a first height difference between the first test point and the reference point along the vertical direction, and measuring a second height difference between the second test point and the reference point along the vertical direction; measuring the rotation angle of the camshaft from the moment when the datum point coincides with the first test point to the moment when the datum point coincides with the second test point; and calculating the phase value of the first test point group according to the first height difference, the second height difference and the rotation angle.
Further, the method for calculating the phase value of each test point group comprises the following steps: the measuring head of the measuring device is abutted with the cam shaft, a point on the measuring head, abutted with the cam shaft, is used as a datum point, and the cam shaft is rotated at least one circle; measuring first height differences between a first test point and a reference point in each circle along the vertical direction, taking an average value of the obtained first height differences as a first average height difference, measuring second height differences between a second test point and the reference point along the vertical direction, and taking an average value of the obtained second height differences as a second average height difference; measuring the rotation angle of the camshaft in each circle from the moment when the datum point coincides with the first test point to the moment when the datum point coincides with the second test point, and taking the average value of the obtained rotation angles as an average rotation angle; and calculating the phase value of the first test point group according to the first average height difference, the second average height difference and the average rotation angle.
Further, the first and second height differences are measured using a dial gauge, and/or the rotation angle is measured using a rotation angle gauge.
Further, the test point group is selected to be three.
Further, the number of revolutions of the camshaft is 3-5 weeks.
Further, the method for comparing the calculated phase value with the theoretical phase value of the lift value of the corresponding valve comprises the following steps: judging whether the absolute value of the difference value between the calculated phase value and the theoretical phase value is smaller than a preset difference value, and determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve when the absolute value of the difference value is smaller than the preset difference value; and when the absolute value of the difference value is larger than or equal to the preset difference value, determining that the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
By adopting the technical scheme, the variable valve lift mechanism is operated to adjust the valve lift value for a plurality of times, the corresponding phase values of the camshaft under different valve lift values are calculated, and the calculated phase values of the camshaft are sequentially compared with the corresponding theoretical phase values, so that whether the variable valve lift mechanism is abnormal or not can be rapidly and conveniently determined, and the variable valve lift mechanism can be used for various scenes such as whether the variable valve lift mechanism is successfully installed or not and whether the variable valve lift mechanism is tested for faults or not, and the problem that the variable valve lift mechanism is difficult to test or examine in the prior art is effectively solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 illustrates a flow chart of a first embodiment of a method of testing a variable valve lift mechanism according to the present disclosure;
FIG. 2 illustrates a flow chart of a second embodiment of a method of testing a variable valve lift mechanism according to the present disclosure;
FIG. 3 illustrates a flow chart of a third embodiment of a method of testing a variable valve lift mechanism according to the present disclosure;
FIG. 4 illustrates a flow chart of a fourth embodiment of a method of testing a variable valve lift mechanism according to the present disclosure;
FIG. 5 shows a schematic structural diagram of a fifth embodiment of a method of testing a variable valve lift mechanism according to the present invention;
FIG. 6 shows a schematic structural diagram of a sixth embodiment of a method of testing a variable valve lift mechanism according to the present invention;
fig. 7 shows a schematic structural view of a seventh embodiment of a method of testing a variable valve lift mechanism according to the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.
Referring to fig. 1-7, a method of testing a variable valve lift mechanism is provided according to an embodiment of the present application.
The method for testing the variable valve lift mechanism comprises the following steps: and calculating a phase value of a camshaft once every time the lift value of the valve is adjusted by operating the variable valve lift mechanism to adjust the lift value of the valve at least once, wherein the camshaft is used for driving the valve, the calculated phase value is compared with a theoretical phase value of the lift value of the corresponding valve to judge whether the variable valve lift mechanism is normal or not, wherein the valve lift mechanism is determined to be in a normal state when the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve, and the variable valve lift mechanism is determined to be in an abnormal state when the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
By the aid of the technical scheme, the variable valve lift mechanism is operated to adjust the valve lift value for multiple times, corresponding phase values of the camshaft under different valve lift values are calculated, and the calculated phase values of the camshaft are sequentially compared with corresponding theoretical phase values, so that whether the variable valve lift mechanism is abnormal or not can be rapidly and conveniently determined, and the variable valve lift mechanism can be used for various scenes of checking whether the variable valve lift mechanism is successfully installed, testing whether the variable valve lift mechanism is faulty or not and the like, and the problem that the variable valve lift mechanism is difficult to test or check in the prior art is effectively solved.
As shown in fig. 1, by applying the technical scheme of the present application, firstly, the lift value of the valve is adjusted, then, the phase value of the camshaft under the current lift value condition of the valve is calculated, the calculated phase value is matched with the theoretical phase value, and whether the variable valve lift mechanism is abnormal or not is determined according to the matched structure. For example, by applying the technical scheme of the application, firstly, the lift value of the valve is adjusted to a first lift value, and the first phase value of the corresponding camshaft at the moment is measured, the first phase value is matched with the first theoretical phase value, then, the lift value of the valve is adjusted to a second lift value, and the second phase value of the corresponding camshaft at the moment is measured, and the second phase value is matched with the second theoretical phase value. The range, the number and the distribution of the lift values of the valves can be selected by a tester or a maintainer according to actual conditions, so that the tester can test the variable valve lift mechanism quickly and conveniently, and selectively test the points with larger influence on the engine performance by parts.
Further, before operating the variable valve lift mechanism to adjust the lift value of the valve includes: and connecting a measuring part of the dial indicator with the valve, wherein the measuring part is used for measuring the lift value of the valve.
Specifically, before the variable valve lift mechanism is operated to adjust the lift value of the valve, a measuring tool should be set to ensure that the lift value of the valve is adjusted accurately.
In one exemplary embodiment, the valve lift values are measured using a dial gauge, and the specific implementation is as follows: the dial indicator support is fixed on the upper cover through two bolts, the dial indicator is installed on the dial indicator support, the head of the dial indicator is contacted with the spring seat, and the spring seat is connected with the spring of the valve. Along with the continuous lift of the valve regulated by the variable valve lift mechanism, the valve moves up and down, and the dial indicator reads the valve lift at different moments. Preferably, the bolt model is selected as Q1840630 to fit the upper cap.
Optionally, the dial indicator has high measurement accuracy and low cost. In order to ensure the measurement accuracy of the dial indicator, the bracket is required to be designed, the bracket is fixed on the upper cover through two bolts, one side, far away from each bolt, of the bracket is provided with a mounting hole, the mounting hole is connected with the dial indicator, the mounting hole and the two bolt connection holes form a triangle to increase the stability of the bracket, and reinforcing ribs are arranged on the bracket. FIG. 7 is a schematic illustration of the connection of the dial indicator to the valve.
In another exemplary embodiment, the magnitude of valve lift at different times is measured using a laser rangefinder, as follows: and connecting the laser range finder with the cylinder cover, wherein the range finding range of the laser range finder is larger than the maximum lift value of the variable valve lift mechanism. The laser range finder comprises an LED display screen, and a tester judges whether to use the valve according to the displayed data and continuously adjusts the lift value of the valve.
The lift value of the valve referred to in the present application is a limit value to which the valve can move during the movement of the piston, that is, the lift value of the valve does not change when the variable valve lift mechanism is not operated.
Further, the method of calculating the phase value of the camshaft includes: selecting a plurality of test point groups on the contour line of the cam shaft; calculating the phase value of each test point group; and taking the average value of the phase values of the plurality of test point groups as the final phase value of the camshaft. The arrangement enables the phase value calculation of the cam shaft to be more accurate, and prevents inaccurate phase value calculation of the cam shaft caused by environmental factors or human misoperation. And taking the average value of the phase values of the plurality of test point groups as the final phase value of the camshaft is beneficial to constructing unique values of the phase of the camshaft in different valve lift states, wherein the lift value of each valve corresponds to a valve lift state over-valve lift condition.
Further, the camshaft comprises a rising edge and a falling edge, and the method for selecting a plurality of test point groups on the contour line of the camshaft comprises the following steps: and selecting a first test point at the rising edge, selecting a second test point at the falling edge, wherein the first test point and the second test point are symmetrical about the geometric center line of the cam shaft, and taking the first test point and the second test point as a first test point group. The arrangement enables the distribution of the test points to be more uniform, and the calculated phase value of the camshaft in the current valve lift state is more accurate.
In one exemplary embodiment, as shown in FIG. 5, point A is first selected as the first test point, and then point A1 is selected as the second test point, where point A and point A1 are symmetrical about the geometric centerline of the camshaft, and point A1 are the first test point set. Secondly, a point B is selected as a first test point, a point B1 is selected as a second test point, wherein the point B and the point B1 are symmetrical with respect to the geometric center line of the camshaft, and the point B1 are used as a second test point group. The tester or the maintainer can select more test points to form more test point groups according to actual conditions, so that the test precision of the variable valve lift mechanism can be effectively improved.
Further, the method for calculating the phase value of each test point group comprises the following steps: and (3) abutting a measuring head of the measuring device with the cam shaft, wherein a point on the measuring head, which is abutted with the cam shaft, is used as a datum point, the cam shaft is rotated for one circle, a first height difference between the first test point and the datum point along the vertical direction is measured, a second height difference between the second test point and the datum point along the vertical direction is measured, a rotation angle of the cam shaft when the datum point is overlapped with the first test point is measured, and the phase value of the first test point group is calculated according to the first height difference, the second height difference and the rotation angle. The measuring device is a phase measuring unit.
In an exemplary embodiment, the datum point is shown at M in fig. 6. The valve and the camshaft are both positioned inside the engine. The valve is used for inputting air into the combustion chamber and discharging the combusted waste gas, and is structurally divided into an inlet valve and an exhaust valve. The intake valve is used for sucking air into the engine and mixing with combustion. The exhaust valve is used for exhausting and radiating the burnt exhaust gas. The valve consists of a valve head and a rod part, and a spring seat is arranged on the rod part of the valve to ensure accurate measurement when the lift of the valve is measured. More specifically, the spring seat should be provided at the valve spring.
An engine is a machine capable of converting other forms of energy into mechanical energy and mainly comprises an internal combustion engine, wherein the internal combustion engine comprises a combustion system, an air intake and exhaust system, a timing system, a cooling system, an ignition system and the like. The combustion system mainly comprises a cylinder cover, a cylinder sleeve and a piston. The cylinder cover is provided with a cylinder cover combustion chamber, a combustion chamber is formed among the side wall of the cylinder cover combustion chamber, the cylinder sleeve and the top end surface of the piston, the working process of the engine mainly comprises four strokes of air intake, compression, combustion work and exhaust, the design of the combustion system is critical to the performance of the engine in the combustion work stroke, and the flow state and the combustion effect of gas in the combustion chamber can be improved through the optimal design of the combustion system. The cylinder liner is the main component of the cylinder. The cylinder is a source for generating power by implementing a work cycle. Each cylinder with cylinder sleeve is installed in the organism, and the top of cylinder is sealed with the cylinder cap. The piston can reciprocate in the cylinder sleeve and seals the cylinder from the lower part of the cylinder, so that a sealed space with the volume regularly changing is formed. The fuel is burned in this space, and the generated gas power pushes the piston to move. The reciprocating motion of the piston drives the crankshaft to rotate through the connecting rod, and the crankshaft outputs power from the flywheel end. The crank-link mechanism consisting of piston group, connecting rod group, crankshaft and flywheel is the main part of internal combustion engine for transmitting power. The crankshaft serves to convert the reciprocating motion of the piston into rotational motion and to transmit work of an expansion stroke out through a flywheel mounted on the rear end of the crankshaft. The flywheel can store energy, so that other strokes of the piston can work normally, and the crankshaft rotates uniformly. The piston consists of a piston body, a piston ring, a piston pin and the like. The piston body is cylindrical. The piston body is provided with a piston ring, and the cylinder is sealed by the piston ring when the piston body reciprocates. The piston pin is cylindrical and connects the piston body and the connecting rod. One end of the connecting rod reciprocates with the piston, and the other end rotates around the axis of the crankshaft with the crank pin, and the rod body of the connecting rod performs complex swinging motion.
Further, the method for calculating the phase value of each test point group comprises the following steps: the measuring head of the measuring device is abutted with the cam shaft, a point on the measuring head, abutted with the cam shaft, is used as a datum point, and the cam shaft is rotated at least one circle; measuring first height differences between a first test point and a reference point in each circle along the vertical direction, taking an average value of the obtained first height differences as a first average height difference, measuring second height differences between a second test point and the reference point along the vertical direction, and taking an average value of the obtained second height differences as a second average height difference; measuring the rotation angle of the camshaft in each circle from the moment when the datum point coincides with the first test point to the moment when the datum point coincides with the second test point, and taking the average value of the obtained rotation angles as an average rotation angle; and calculating the phase value of the first test point group according to the first average height difference, the second average height difference and the average rotation angle.
Further, the first height difference and the second height difference are measured by using a dial gauge, and the rotation angle is measured by using a rotation angle gauge.
In one exemplary embodiment, the set of test points is selected to be three. The arrangement can enable the calculated phase value of the cam shaft in different lift states to keep higher precision, and meanwhile, the testing method is convenient.
In one exemplary embodiment, the number of revolutions of the camshaft is 3-5 weeks. This arrangement can further improve the accuracy of the calculated phase values of the camshaft in the different lift states.
Further, the method for comparing the calculated phase value with the theoretical phase value of the lift value of the corresponding valve comprises the following steps: judging whether the absolute value of the difference value between the calculated phase value and the theoretical phase value is smaller than a preset difference value, and determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve when the absolute value of the difference value is smaller than the preset difference value. And when the absolute value of the difference value is larger than or equal to the preset difference value, determining that the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
In one exemplary embodiment, as shown in fig. 2, the method for testing a variable valve lift mechanism of the present application is applied to a mounting process of the variable valve lift mechanism, that is, after an engine mounts the variable valve lift mechanism, the mounting effect of the variable valve lift mechanism is checked. The specific implementation flow is as follows: installing a variable valve lift mechanism, installing a dial indicator and a measuring device, adjusting the valve lift value through the variable valve lift mechanism, calculating the phase value of a cam shaft under the condition of the current valve lift value, judging whether the calculated phase value is matched with a corresponding theoretical phase value, determining that the variable valve lift mechanism fails to be installed when the calculated phase value is not matched with the corresponding theoretical phase value, adding a group of test points when the calculated phase value is matched with the corresponding theoretical phase value, and executing the steps in the embodiment on the new test points. And when a group of test points are newly added, judging whether the number of the test points meets the preset condition, wherein the preset condition can be the preset number of the test points by a tester. And when the phase value of the camshaft calculated by each group of test points is matched with the corresponding theoretical phase value, determining that the variable valve lift mechanism is successfully installed.
In one exemplary embodiment, as shown in fig. 3, the method for testing a variable valve lift mechanism of the present application is applied to a process of detecting an engine failure, that is, after the engine fails, whether the variable valve lift mechanism has a failure is checked. The specific implementation flow is as follows: installing a variable valve lift mechanism, installing a dial indicator and a measuring device, adjusting the valve lift value through the variable valve lift mechanism, calculating the phase value of a cam shaft under the condition of the current valve lift value, judging whether the calculated phase value is matched with a corresponding theoretical phase value, determining that the variable valve lift mechanism fails when the calculated phase value is not matched with the corresponding theoretical phase value, further checking the engine state under the current valve lift value, adding a group of test points when the calculated phase value is matched with the corresponding theoretical phase value, and executing the steps in the embodiment on the new test points. And when a group of test points are newly added, judging whether the number of the test points meets the preset condition, wherein the preset condition can be the preset number of the test points by a tester. And when the phase value of the camshaft calculated by each group of test points is matched with the corresponding theoretical phase value, determining that the variable valve lift mechanism does not malfunction.
Optionally, by applying the technical scheme of the application, the variable valve lift mechanism continuously adjusts the lift of the valve, and the valve moves along the axis. Under each valve lift state, the camshaft drives the measuring device to move up and down, 3 points are respectively selected on the rising edge and the falling edge of the camshaft to conduct phase value conversion, the average value is taken as the phase value under the current valve lift, and the phase value measurement of different valve lifts of the propulsion is carried out, so that the relation between each valve lift and the phase value of the camshaft can be formed.
Specifically, the technical scheme of the application provides a method for testing a variable valve lift mechanism, and it is to be noted that the method for testing the variable valve lift mechanism is a static phase measurement method, that is, a method for measuring the phase of a cam shaft when an engine is in a static state, and can be used for measuring the timing phase in a loading state so as to judge whether the function of the variable valve lift mechanism meets the design requirement. In the prior art, a traditional engine only has one valve lift, the timing phase is also the only position, the valve lift is continuously changed by a variable valve lift mechanism, the traditional engine has a plurality of valve lifts, the deviation of the phase under different valve lift conditions is required to be measured, and the traditional testing method can not meet the testing requirement. The testing method of the camshaft phase position measuring device is used for measuring the phase position of the camshaft under different valve lift conditions, so that the correct relation between the valve lift and the timing phase position is ensured, and the operation of testing personnel is facilitated.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method of testing a variable valve lift mechanism, the method comprising:
at least one adjustment of the lift value of the valve is performed by operating the variable valve lift mechanism, and each time the lift value of the valve is adjusted, the phase value of a camshaft is calculated, wherein the camshaft is used for driving the valve;
comparing the calculated phase value with a theoretical phase value of the lift value of the corresponding valve to judge whether the variable valve lift mechanism is normal, wherein the valve lift mechanism is determined to be in a normal state when the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve, and the variable valve lift mechanism is determined to be in an abnormal state when the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve;
the method for calculating the phase value of the camshaft comprises the following steps:
selecting a plurality of test point groups on the contour line of the camshaft;
calculating the phase value of each test point group;
taking an average value of the phase values of a plurality of test point groups as a final phase value of the camshaft;
the cam shaft comprises a rising edge and a falling edge, and the method for selecting a plurality of test point groups on the contour line of the cam shaft comprises the following steps:
selecting a first test point on the rising edge, selecting a second test point on the falling edge, wherein the first test point and the second test point are symmetrical with respect to the geometric center line of the cam shaft, and taking the first test point and the second test point as a first test point group;
the method for calculating the phase value of each test point group comprises the following steps:
the measuring head of the measuring device is abutted with the cam shaft, a point on the measuring head, abutted with the cam shaft, is used as a datum point, and the cam shaft is rotated for one circle;
measuring a first height difference between the first test point and the reference point along the vertical direction, and measuring a second height difference between the second test point and the reference point along the vertical direction;
measuring a rotation angle of the camshaft from when the datum point is overlapped with the first test point to when the datum point is overlapped with the second test point;
and calculating the phase value of the first test point group according to the first height difference, the second height difference and the rotation angle.
2. The method of claim 1, wherein operating the variable valve lift mechanism to adjust the lift value of the valve is preceded by:
and connecting a measuring part of the dial indicator with the valve, wherein the measuring part is used for measuring the lift value of the valve.
3. The method according to claim 1, wherein the first and second height differences are measured using a dial gauge and/or the rotation angle is measured using a rotation angle gauge.
4. The method of claim 1, wherein the set of test points is selected to be three.
5. The method according to claim 1, wherein the method of comparing the calculated phase value with the theoretical phase value of the lift value of the corresponding valve comprises:
judging whether the absolute value of the difference value between the calculated phase value and the theoretical phase value is smaller than a preset difference value, and determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve when the absolute value of the difference value is smaller than the preset difference value;
and when the absolute value of the difference value is larger than or equal to the preset difference value, determining that the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
6. A method of testing a variable valve lift mechanism, the method comprising:
at least one adjustment of the lift value of the valve is performed by operating the variable valve lift mechanism, and each time the lift value of the valve is adjusted, the phase value of a camshaft is calculated, wherein the camshaft is used for driving the valve;
comparing the calculated phase value with a theoretical phase value of the lift value of the corresponding valve to judge whether the variable valve lift mechanism is normal, wherein the valve lift mechanism is determined to be in a normal state when the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve, and the variable valve lift mechanism is determined to be in an abnormal state when the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve;
the method for calculating the phase value of the camshaft comprises the following steps:
selecting a plurality of test point groups on the contour line of the camshaft;
calculating the phase value of each test point group;
taking an average value of the phase values of a plurality of test point groups as a final phase value of the camshaft;
the cam shaft comprises a rising edge and a falling edge, and the method for selecting a plurality of test point groups on the contour line of the cam shaft comprises the following steps:
selecting a first test point on the rising edge, selecting a second test point on the falling edge, wherein the first test point and the second test point are symmetrical with respect to the geometric center line of the cam shaft, and taking the first test point and the second test point as a first test point group;
the method for calculating the phase value of each test point group comprises the following steps:
abutting a measuring head of a measuring device with the cam shaft, wherein a point on the measuring head, which abuts against the cam shaft, is a datum point, and the cam shaft is rotated at least one circle;
measuring a first height difference between the first test point and the datum point in each circle along the vertical direction, taking an average value of the obtained first height differences as a first average height difference, measuring a second height difference between the second test point and the datum point along the vertical direction, and taking an average value of the obtained second height differences as a second average height difference;
measuring a rotation angle of the camshaft in each circle from when the datum point is overlapped with the first test point to when the datum point is overlapped with the second test point, and taking an average value of the obtained rotation angles as an average rotation angle;
and calculating the phase value of the first test point group according to the first average height difference, the second average height difference and the average rotation angle.
7. The method of claim 6, wherein the first and second height differences are measured using a dial gauge and/or the rotation angle is measured using a rotation angle gauge.
8. The method of claim 6, wherein the camshaft rotates about 3 to 5 weeks.
9. The method according to claim 6, wherein the method of comparing the calculated phase value with the theoretical phase value of the lift value of the corresponding valve comprises:
judging whether the absolute value of the difference value between the calculated phase value and the theoretical phase value is smaller than a preset difference value, and determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve when the absolute value of the difference value is smaller than the preset difference value;
and when the absolute value of the difference value is larger than or equal to the preset difference value, determining that the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
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