CN113983899A - Method for testing variable valve lift mechanism - Google Patents
Method for testing variable valve lift mechanism Download PDFInfo
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention provides a method for testing a variable valve lift mechanism, which comprises the following steps: adjusting the lift value of the valve at least once by operating the variable valve lift mechanism, and calculating the phase value of a camshaft once the lift value of the valve is adjusted once, wherein the camshaft is used for driving the valve; and 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 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
In the traditional engine valve mechanism, the valve lift is fixed and unchangeable, so a user still uses a large valve lift when waiting for a traffic light or when the user controls the engine to be in a low-speed and low-load state, the air inflow and the oil quantity are wasted, the optimization of the performance and the emission of the engine 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 the load in the whole working range of the engine.
The variable valve lift actuating mechanism is combined with a variable valve timing technology for use, timing can be timely adjusted, accordingly, the air inlet performance and the air exhaust performance of an engine are improved, requirements of the engine on power performance, economy and emission under the conditions of different rotating speeds and different loads are well met, particularly the effect on oil saving is more prominent, and the engine is in a mainstream trend when being loaded with the variable valve lift actuating mechanism under the condition that oil consumption regulations are increasingly strict.
However, the existing variable valve actuating mechanism still has limitations. After the engine is provided with the variable valve lift mechanism, the installation effect is difficult to determine, and when the variable valve lift mechanism breaks down, the fault is difficult to remove, 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 the variable valve actuating mechanism cannot be quickly tested in the prior art.
In order 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 including: adjusting the lift value of the valve at least once by operating the variable valve lift mechanism, and calculating the phase value of a camshaft once the lift value of the valve is adjusted once, wherein the camshaft is used for driving the valve; and 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 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, operating the variable valve lift mechanism to adjust the lift value of the valve may include: 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 camshaft; calculating phase values of the test point groups; 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 the plurality of test point groups on the contour line of the camshaft comprises the following steps: and 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 about the geometric center line of the camshaft, 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: abutting a measuring head of the measuring device with the camshaft, wherein a point, abutted with the camshaft, on the measuring head is used as a reference point, and rotating the camshaft for one circle; measuring a first height difference of the first test point and the reference point along the vertical direction, and measuring a second height difference of the second test point and the reference point along the vertical direction; measuring the rotation angle of the camshaft when the camshaft rotates from the time when the reference point is overlapped with the first test point to the time when the reference 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.
Further, the method for calculating the phase value of each test point group comprises the following steps: abutting a measuring head of the measuring device with the camshaft, wherein a point, abutted with the camshaft, on the measuring head is used as a reference point, and rotating the camshaft for at least one circle; measuring first height differences of the first test points and the reference points in the vertical direction in each circle, taking an average value of the obtained first height differences as a first average height difference, measuring second height differences of the second test points and the reference points in 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 inner cam shaft in each circle from the time when the reference point is overlapped with the first test point to the time when the reference point is overlapped with the second test point, and taking the average value of the obtained multiple rotation angles as the 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 using a dial gauge, and/or the rotation angle is measured using a rotation angle gauge.
Further, the test point groups are selected to be three.
Further, the number of revolutions of the camshaft is 3-5 revolutions.
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 or not, and when the absolute value of the difference value is smaller than the preset difference value, determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve; and when the absolute value of the difference is larger than or equal to the preset difference, determining that the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
By applying the technical scheme of the invention, the lift value of the valve is adjusted for multiple times by operating the variable valve lift mechanism, the corresponding phase values under different valve lift values of the camshaft are calculated, and the calculated multiple 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 quickly and conveniently determined, the method can be used for detecting whether the variable valve lift mechanism is successfully installed or not, detecting whether the variable valve lift mechanism is in fault or not and the like in various scenes, and the problem that the variable valve lift mechanism is difficult to test or detect in the prior art is effectively solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic flow diagram of a first embodiment of a method of testing a variable valve lift mechanism according to the present invention;
FIG. 2 shows a schematic flow diagram of a second embodiment of a method of testing a variable valve lift mechanism according to the present invention;
FIG. 3 shows a schematic flow diagram of a third embodiment of a method of testing a variable valve lift mechanism according to the present invention;
FIG. 4 shows a schematic flow chart diagram of a fourth embodiment of a method of testing a variable valve lift mechanism according to the present invention;
FIG. 5 is a schematic structural diagram illustrating 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 configuration diagram 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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
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 according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements 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 only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
Referring to fig. 1-7, a method of testing a variable valve lift mechanism is provided according to an exemplary embodiment of the present application.
The method for testing the variable valve lift mechanism comprises the following steps: the method comprises the steps that at least one adjustment is carried out on the lift value of the valve through operating the variable valve lift mechanism, the phase value of the camshaft is calculated once every time the lift value of the valve is adjusted, wherein the camshaft is used for driving the valve, the calculated phase value is compared with the theoretical phase value of the corresponding lift value of the valve to judge whether the variable valve lift mechanism is normal or not, when the calculated phase value is matched with the theoretical phase value of the corresponding lift value of the 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 corresponding lift value of the valve, the variable valve lift mechanism is determined to be in an abnormal state.
By applying the technical scheme of the embodiment, the lift value of the valve is adjusted for multiple times by operating the variable valve lift mechanism, the corresponding phase values under different valve lift values of the camshaft are calculated, and the calculated multiple 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 quickly and conveniently determined, the method can be used for detecting whether the variable valve lift mechanism is successfully installed or not, detecting whether the variable valve lift mechanism is in fault or not and other scenes, and the problem that the variable valve lift mechanism is difficult to test or detect in the prior art is effectively solved.
As shown in fig. 1, according to the technical solution of the present application, a lift value of a valve is first adjusted, a phase value of a camshaft is then calculated under a current lift value condition of the valve, the calculated phase value is matched with a theoretical phase value, and whether a variable valve lift mechanism is abnormal or not is determined according to a matched structure. For example, according to the technical scheme of the application, the lift value of the valve is adjusted to a first lift value, the first phase value of the corresponding camshaft at the time is measured, the first phase value is matched with the first theoretical phase value, the lift value of the valve is adjusted to a second lift value, the second phase value of the corresponding camshaft at the time 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 air valves can be selected by a tester or a maintenance worker according to actual conditions, so that the tester can test the variable air valve lift mechanism quickly and conveniently, and selectively test parts of points with large influence on the performance of the engine.
Further, operating the variable valve lift mechanism to adjust the lift value of the valve may include: 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 gauge should be set to ensure that the lift value of the valve is adjusted accurately.
In an exemplary embodiment, the lift value of the valve is measured by using a dial indicator, and the specific implementation mode 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 in contact with the spring seat, and the spring seat is connected with the spring of the air valve. The valve lift is continuously adjusted along with 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 to be Q1840630 to fit the upper cover.
Optionally, the dial indicator is high in measurement accuracy and low in cost. In order to guarantee the measurement accuracy of the dial indicator, the support needs to be designed, the support is fixed on the upper cover through the two bolts, one side, far away from each bolt, of the support is provided with a mounting hole, the mounting hole is connected with the dial indicator, the mounting hole and the two bolt connecting holes form a triangle to increase the stability of the support, and reinforcing ribs are arranged on the support. Fig. 7 is a schematic connection diagram of the dial indicator and the valve.
In another exemplary embodiment, the laser distance meter is used to measure the valve lift at different times, and the specific implementation manner is 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 continuously adjust the lift value of the valve according to the displayed data.
It should be noted that the lift value of the valve referred to in this application is a limit value to which the valve can move in the process of cooperating with the movement of the piston, that is, when the variable valve lift mechanism does not work, the lift value of the valve is not changed.
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 camshaft; calculating phase values of the test point groups; 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 phase value of the camshaft is more accurately calculated by the arrangement, and inaccurate calculation of the phase value of the camshaft caused by environmental factors or human misoperation is prevented. The average value of the phase values of the plurality of test point groups is used as the final phase value of the camshaft, so that the construction of the unique value of the camshaft phase in different valve lift states is facilitated, wherein the lift value of each valve corresponds to the over-valve lift condition of one valve lift state.
Further, the camshaft comprises a rising edge and a falling edge, and the method for selecting the plurality of test point groups on the contour line of the camshaft comprises the following steps: and 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 about the geometric center line of the camshaft, and taking the first test point and the second test point as a first test point group. The arrangement makes the distribution of the test points more uniform, and the phase value of the camshaft in the current valve lift state obtained through calculation is more accurate.
In an 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 is symmetrical to point a1 about the geometric centerline of the camshaft and point a1 is selected as the first test point set. Secondly, point B is selected as a first test point, and then point B1 is selected as a second test point, wherein point B is symmetrical to point B1 about the geometric center line of the camshaft, and point B1 are selected as a second test point group. The testing personnel or the maintenance personnel can select more test points according to actual conditions to form more test point groups, and the testing 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: the measuring head of the measuring device is abutted with the camshaft, a point on the measuring head abutted with the camshaft is used as a reference point, the camshaft rotates for a circle, a first height difference between the first test point and the reference point along the vertical direction is measured, a second height difference between the second test point and the reference point along the vertical direction is measured, the rotation angle of the camshaft when the reference point is overlapped with the first test point and the reference point is rotated to be overlapped with the second test point when the reference 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 the phase measuring unit.
In one exemplary embodiment, as shown at M in FIG. 6, is a reference point. The valve and the camshaft are both located inside the engine. The valve is used for inputting air into the combustion chamber and discharging combusted waste gas, and structurally comprises an intake valve and an exhaust valve. The intake valve functions to draw air into the engine for combustion in combination with the combustion. The exhaust valve is used for discharging combusted waste gas and dissipating heat. The valve comprises a valve head and a rod, and the spring seat is arranged at the rod of the valve to ensure the measurement accuracy when the change value of the lift of the valve is measured. More specifically, a spring seat should be provided at the valve spring.
The engine is a machine capable of converting other forms of energy into mechanical energy, and mainly comprises an internal combustion engine, and 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, the combustion chamber is formed among the side wall of the cylinder cover combustion chamber, a cylinder sleeve and the top end face of a piston, the working process of the engine mainly comprises four strokes of air inlet, compression, combustion work and exhaust, wherein the design of a combustion system is crucial 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 optimized design of the combustion system. The cylinder liner is the main component of the cylinder. The cylinder is a source for realizing working cycle and generating power. Each cylinder with a cylinder sleeve is arranged in the machine body, and the top end of each cylinder is sealed by a cylinder cover. The piston can reciprocate in the cylinder sleeve and close the cylinder from the lower part of the cylinder, thereby forming a sealed space with the volume changing regularly. Fuel is burnt in the space, and the generated gas power pushes the piston to move. The reciprocating motion of the piston pushes the crankshaft to rotate through the connecting rod, and the crankshaft outputs power from the flywheel end. The crank-connecting rod mechanism composed of piston group, connecting rod group, crankshaft and flywheel is the main part of internal combustion engine for transmitting power. The crankshaft converts the reciprocating motion of the piston into rotary motion and transmits the work of the expansion stroke 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 piston ring seals the cylinder 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 along with the piston, the other end of the connecting rod rotates along with the crank pin around the axis of the crank, and the rod body of the connecting rod does complex swinging motion.
Further, the method for calculating the phase value of each test point group comprises the following steps: abutting a measuring head of the measuring device with the camshaft, wherein a point, abutted with the camshaft, on the measuring head is used as a reference point, and rotating the camshaft for at least one circle; measuring first height differences of the first test points and the reference points in the vertical direction in each circle, taking an average value of the obtained first height differences as a first average height difference, measuring second height differences of the second test points and the reference points in 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 inner cam shaft in each circle from the time when the reference point is overlapped with the first test point to the time when the reference point is overlapped with the second test point, and taking the average value of the obtained multiple rotation angles as the 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 indicator, and the rotation angle is measured by using a rotation angle indicator.
In one exemplary embodiment, the set of test points is selected to be three. The phase value of the camshaft obtained through calculation under different lift states can be kept at high precision, and meanwhile, the testing method is convenient and fast.
In one exemplary embodiment, the camshaft rotates 3-5 revolutions. The arrangement can further improve the accuracy of the calculated phase value of the camshaft in 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: and 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 or not, and when the absolute value of the difference value is smaller than the preset difference value, determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve. And when the absolute value of the difference is larger than or equal to the preset difference, determining that the calculated phase value is not matched with the theoretical phase value of the lift value of the corresponding valve.
In an exemplary embodiment, as shown in fig. 2, the method for testing the variable valve lift mechanism of the present application is applied to the installation process of the variable valve lift mechanism, namely, after the variable valve lift mechanism is installed in the engine, the installation effect of the variable valve lift mechanism is checked. The specific implementation flow is as follows: the method comprises the steps of installing a variable valve lift mechanism, installing a dial indicator and a measuring device, adjusting a lift value of a valve through the variable valve lift mechanism, calculating a phase value of a camshaft under the condition of the current lift value of the valve, judging whether the calculated phase value is matched with a corresponding theoretical phase value or not, determining that the variable valve lift mechanism is failed 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. When a group of test points is added, whether the number of the test points meets a preset condition is judged, and the preset condition can be that the number of the test points is preset 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 the variable valve lift mechanism of the present application is applied to check whether the variable valve lift mechanism has a fault during the process of detecting the engine fault, i.e., after the engine fault occurs. The specific implementation flow is as follows: the method comprises the steps of installing a variable valve lift mechanism, installing a dial indicator and a measuring device, adjusting a lift value of a valve through the variable valve lift mechanism, calculating a phase value of a camshaft under the condition of the current lift value of the valve, judging whether the calculated phase value is matched with a corresponding theoretical phase value or not, determining that the variable valve lift mechanism breaks down when the calculated phase value is not matched with the corresponding theoretical phase value, further checking the state of an engine 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. When a group of test points is added, whether the number of the test points meets a preset condition is judged, and the preset condition can be that the number of the test points is preset 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 have a fault.
Optionally, according to 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. In 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 perform phase value conversion, the average value is taken as the phase value under the current valve lift, the phase value measurement of different valve lifts is performed by analogy, and 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, namely a method for measuring the phase of a camshaft when an engine is in a static state, and the method can be used for measuring a timing phase in an installation 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, a timing phase is also the only position, a variable valve lift mechanism enables the valve lift to be continuously changed, the variable valve lift mechanism has a plurality of valve lifts, phase deviation under different valve lift conditions needs to be measured, and the traditional test method cannot meet test requirements. The testing method provided by the application is used for measuring the phase of the camshaft under the conditions of different valve lifts, so that the correct relation between the valve lift and the timing phase is ensured, and the operation of testing personnel is facilitated.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same 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 submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of testing a variable valve lift mechanism, the method comprising:
adjusting the lift value of the valve at least once by operating the variable valve lift mechanism, and calculating the phase value of a camshaft once the lift value of the valve is adjusted once, wherein the camshaft is used for driving the valve;
and comparing the calculated phase value with a theoretical phase value of the corresponding lift value of the 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.
2. The method of claim 1, wherein operating the variable valve lift mechanism to adjust the lift value of the valve comprises, prior to:
and connecting a measuring part of a dial indicator with the valve, wherein the measuring part is used for measuring the lift value of the valve.
3. The method of claim 1, wherein the method of calculating the phase value of the camshaft comprises:
selecting a plurality of test point groups on the contour line of the camshaft;
calculating phase values of the test point groups;
and taking the average value of the phase values of the plurality of test point groups as the final phase value of the camshaft.
4. The method of claim 3, wherein the camshaft includes a rising edge and a falling edge, and wherein selecting the plurality of test point sets on the profile line of the camshaft comprises:
and 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 about the geometric center line of the camshaft, and the first test point and the second test point are used as a first test point group.
5. The method of claim 4, wherein calculating the phase value for each of the test point sets comprises:
abutting a measuring head of a measuring device with the camshaft, wherein a point, abutted against the camshaft, on the measuring head is a reference point, and rotating the camshaft for one circle;
measuring a first height difference of the first test point and the reference point along the vertical direction, and measuring a second height difference of the second test point and the reference point along the vertical direction;
measuring the rotation angle of the camshaft when the reference point is overlapped with the first test point and the camshaft rotates to the position when the reference 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.
6. The method of claim 4, wherein calculating the phase value for each of the test point sets comprises:
abutting a measuring head of a measuring device with the camshaft, wherein a point, abutted with the camshaft, on the measuring head is a reference point, and rotating the camshaft for at least one circle;
measuring first height differences of the first test point and the reference point in the vertical direction in each circle, taking an average value of the obtained first height differences as a first average height difference, measuring second height differences of the second test point and the reference point in 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 when the camshaft rotates from the superposition of the reference point and the first test point to the superposition of the reference point and the second test point in each circle, 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 according to claim 5 or 6, characterized in that 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 3, wherein the set of test points is selected to be three.
9. The method of claim 6, wherein the camshaft rotates 3-5 revolutions.
10. The method of claim 1, wherein comparing the calculated phase value with a corresponding theoretical phase value of the lift value of the 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 or not, and when the absolute value of the difference value is smaller than the preset difference value, determining that the calculated phase value is matched with the theoretical phase value of the lift value of the corresponding valve;
and when the absolute value of the difference is larger than or equal to the preset difference, 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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