Camshaft cam lift curve error adjustment method, device and storage medium

Abstract

The application provides a camshaft cam lift curve error adjustment method, device and storage medium, and the method comprises the following steps: acquiring preset profile parameters and actual profile parameters of a camshaft; determining the minimum rotation angle, the maximum rotation angle, the maximum lift error value and the key rotation angle corresponding to the maximum lift error value of the camshaft with the lift error; determining the error compensation parameter according to the allowable error range, and calculating the reference adjustment parameter according to the maximum lift error value and the error compensation parameter; determining the uplink error rotation angle interval, the uplink attenuation coefficient, the downlink error rotation angle interval and the downlink attenuation coefficient of the camshaft; calculating the uplink adjustment parameter and the downlink adjustment parameter; and determining the adjustment profile parameters of the camshaft. The camshaft cam lift curve error adjustment method, device and storage medium provided by the application can reduce the difficulty of camshaft error adjustment and ensure that the adjusted camshaft profile has good smoothness.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of engine machining technology, and particularly relates to a camshaft cam lift curve error adjusting method and device and a storage medium. BACKGROUND

[0002] As one of the three structures of an internal combustion engine, the main function of a valve train is to realize the air exchange process of the engine. When working, the valve train will open and close the intake and exhaust valves according to the working sequence of the engine cylinder to ensure that the cylinder can timely exhaust exhaust gas and inhale fresh air. In the entire valve train, the machining quality of the cam profile of the camshaft will directly determine the working effect of the valve train, thereby having a decisive influence on the overall performance of the engine.

[0003] In order to improve the machining precision of the cam profile of the camshaft, a person skilled in the art will use a numerical control machine tool to grind the camshaft. However, due to various factors, the actual lift curve of the camshaft after grinding will have errors compared with the preset lift curve. In the prior art, the adjusting method of the cam lift curve error mainly relies on manual work. The workers will repeatedly adjust the angle points of the profile on the camshaft that have exceeded the tolerance to make the finished product meet the preset size requirements.

[0004] However, the cam lift curve of the camshaft is a smooth circular arc curve. Adjusting only the angle points of the profile that have exceeded the tolerance is not only difficult to operate, but also easily affects the smoothness of the cam lift curve. When the smoothness of the cam lift curve is affected, the working effect of the valve train will decrease, thereby affecting the overall performance of the engine. SUMMARY

[0005] Therefore, the application aims to provide a camshaft cam lift curve error adjusting method and device and a storage medium to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0007] In a first aspect, the embodiment of the application provides a camshaft cam lift curve error adjusting method, which comprises the following steps:

[0008] obtaining preset profile parameters and actual profile parameters of the camshaft, wherein the preset profile parameters comprise preset lift values corresponding to each rotation angle of the camshaft, and the actual profile parameters comprise actual lift values corresponding to each rotation angle of the camshaft;

[0009] determining, according to the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft, a minimum rotation angle, a maximum rotation angle, a maximum lift error value and a key rotation angle corresponding to the maximum lift error value of the camshaft that has a lift error.

[0010] obtaining a permissible error range of the camshaft, determining an error compensation parameter according to the permissible error range, and calculating a reference adjustment parameter according to the maximum lift error value and the error compensation parameter;

[0011] determining an upstroke error rotation angle interval and an upstroke attenuation coefficient of the camshaft according to the minimum rotation angle and the key rotation angle, and determining a downstroke error rotation angle interval and a downstroke attenuation coefficient of the camshaft according to the key rotation angle and the maximum rotation angle;

[0012] calculating upstroke adjustment parameters corresponding to each rotation angle in the upstroke error rotation angle interval according to the upstroke attenuation coefficient and the reference adjustment parameter, and calculating downstroke adjustment parameters corresponding to each rotation angle in the downstroke error rotation angle interval according to the downstroke attenuation coefficient and the reference adjustment parameter;

[0013] determining adjustment profile parameters of the camshaft according to the actual profile parameters of the camshaft, the reference adjustment parameter, the upstroke adjustment parameters and the downstroke adjustment parameters, and machining the camshaft according to the adjustment profile parameters of the camshaft.

[0014] Further, after the determination of the upstroke error rotation angle interval and the upstroke attenuation coefficient of the camshaft according to the minimum rotation angle and the key rotation angle, and the determination of the downstroke error rotation angle interval and the downstroke attenuation coefficient of the camshaft according to the key rotation angle and the maximum rotation angle, the camshaft cam lift curve error adjustment method comprises:

[0015] determining a positive acceleration rotation angle interval and a negative acceleration rotation angle interval according to the preset profile parameters of the camshaft, calculating a smooth correction coefficient through the positive acceleration rotation angle interval and the negative acceleration rotation angle interval, and respectively correcting the upstroke attenuation coefficient and the downstroke attenuation coefficient according to the smooth correction coefficient.

[0016] Further, before the determination of the minimum rotation angle, the maximum rotation angle, the maximum lift error value and the key rotation angle corresponding to the maximum lift error value of the camshaft with lift error according to the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft, the camshaft cam lift curve error adjustment method comprises:

[0017] judging whether the rotation direction of the camshaft is the same as the rotation direction of the machining equipment, and performing reverse sequence processing on the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft when the rotation direction of the camshaft is not the same as the rotation direction of the machining equipment.

[0018] Further, the obtaining of the permissible error range of the camshaft and the determination of the error compensation parameter according to the permissible error range comprise:

[0019] An allowable error range of the camshaft is acquired, and one third of the allowable error range is used as an error compensation parameter;

[0020] The reference adjustment parameter is calculated according to the maximum lift error value and the error compensation parameter.

[0021] The reference adjustment parameter is calculated according to a difference between the maximum lift error value and one third of the allowable error range.

[0022] In a second aspect, an embodiment of the present application provides a camshaft cam lift curve error adjustment device, which comprises:

[0023] An acquisition module is configured to acquire preset profile parameters and actual profile parameters of the camshaft, wherein the preset profile parameters comprise preset lift values corresponding to each rotation angle of the camshaft, and the actual profile parameters comprise actual lift values corresponding to each rotation angle of the camshaft.

[0024] A first determination module is configured to determine a minimum rotation angle, a maximum rotation angle, a maximum lift error value and a key rotation angle corresponding to the maximum lift error value of the camshaft according to the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft.

[0025] A first calculation module is configured to acquire an allowable error range of the camshaft, determine an error compensation parameter according to the allowable error range, and calculate a reference adjustment parameter according to the maximum lift error value and the error compensation parameter.

[0026] A second determination module is configured to determine an upstroke error rotation angle range and an upstroke attenuation coefficient of the camshaft according to the minimum rotation angle and the key rotation angle, and determine a downstroke error rotation angle range and a downstroke attenuation coefficient of the camshaft according to the key rotation angle and the maximum rotation angle.

[0027] A second calculation module is configured to calculate upstroke adjustment parameters corresponding to each rotation angle in the upstroke error rotation angle range according to the upstroke attenuation coefficient and the reference adjustment parameter, and calculate downstroke adjustment parameters corresponding to each rotation angle in the downstroke error rotation angle range according to the downstroke attenuation coefficient and the reference adjustment parameter.

[0028] A third determination module is configured to determine an adjusted profile parameter of the camshaft according to the actual profile parameter of the camshaft, the reference adjustment parameter, the upstroke adjustment parameter and the downstroke adjustment parameter, and process the camshaft according to the adjusted profile parameter of the camshaft.

[0029] In a third aspect, an embodiment of the present application further provides a storage medium containing computer executable instructions, which are used to execute the camshaft cam lift curve error adjustment method provided by the above-mentioned embodiments when executed by a computer processor.

[0030] Compared with the prior art, the camshaft cam lift curve error adjustment method, device and storage medium have the following advantages:

[0031] The camshaft cam lift curve error adjustment method, device and storage medium can determine the minimum rotation angle, the maximum rotation angle, the maximum lift error value and the key rotation angle corresponding to the maximum lift error value of the camshaft according to the preset profile parameters and the actual profile parameters of the camshaft, and can calculate the reference adjustment parameter according to the maximum lift error value and the error compensation parameter, thereby reserving a margin for the inherent error of the machining equipment. Meanwhile, the adjustment parameters of other rotation angles of the camshaft can be calculated according to the uplink attenuation coefficient and the downlink attenuation coefficient, so as to generate reasonable adjustment profile parameters, so that the adjusted camshaft has a smooth profile contour, and the working effect of the valve train is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and serve as an appositive explanation of the illustrative embodiments of the present application and their description, and do not constitute improper limitations on the present application. In the drawings:

[0033] Figure 1 A flowchart of the camshaft cam lift curve error adjustment method according to the first embodiment of the present application;

[0034] Figure 2 A schematic diagram of the camshaft cam lift curve error adjustment device according to the second embodiment of the present application. DETAILED DESCRIPTION

[0035] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0036] Embodiment one

[0037] Figure 1 The flowchart of the camshaft cam lift curve error adjustment method provided for the first embodiment of the present application is shown in the figure. In this embodiment, the camshaft cam lift curve error adjustment method specifically includes the following steps:

[0038] Step 110, acquiring preset profile parameters and actual profile parameters of the camshaft, the preset profile parameters including preset lift values corresponding to each rotation angle of the camshaft, and the actual profile parameters including actual lift values corresponding to each rotation angle of the camshaft.

[0039] In the machining of the camshaft, the rotation angle of the camshaft and the lift corresponding to each rotation angle are the core parameters determining the performance of the camshaft. However, due to the limitation of machining precision, the actual profile parameters of the finished camshaft cannot match the preset profile parameters in the drawing, so as to facilitate the secondary machining adjustment of the camshaft by the staff, the preset lift value corresponding to each rotation angle of the camshaft and the actual lift value corresponding to each rotation angle of the camshaft are obtained, so as to facilitate the judgment of the area with machining error and the actual error of the camshaft.

[0040] In addition, since the camshaft is usually machined by a numerical control grinding machine, the camshaft cam lift curve error adjustment method described in the embodiment can add the following steps before the next step:

[0041] Determine whether the rotation direction of the camshaft is the same as the rotation direction of the machining equipment, and when the rotation direction of the camshaft is different from the rotation direction of the machining equipment, perform reverse sequence processing on the actual lift value corresponding to each rotation angle of the camshaft and the preset lift value corresponding to each rotation angle of the camshaft.

[0042] Since the staff needs to input the machining amount of each angle in turn when using the numerical control grinding machine to machine the camshaft, when the rotation direction of the camshaft is different from the rotation direction of the machining equipment, the actual lift value corresponding to each rotation angle of the camshaft and the preset lift value corresponding to each rotation angle of the camshaft should be processed in reverse sequence, so that the machining amount input into the numerical control grinding machine matches the rotation direction of the camshaft when actually working.

[0043] Step 120, according to the actual lift value corresponding to each rotation angle of the camshaft and the preset lift value corresponding to each rotation angle of the camshaft, determine the minimum rotation angle, the maximum rotation angle, the maximum lift error value and the key rotation angle corresponding to the maximum lift error value of the camshaft with lift error.

[0044] When the actual lift value of the camshaft at a certain rotation angle is different from the preset lift value corresponding to the rotation angle, it is determined that the rotation angle has a lift error. Correspondingly, the difference between the actual lift value and the preset lift value of the rotation angle is the lift error value. Without considering abnormal damage such as collision, the machining error of the camshaft profile contour will continuously occur at multiple rotation angles of the camshaft, and there will be a rotation angle with the maximum lift error in the rotation angle interval where the lift error occurs. Therefore, in order to improve the effectiveness and accuracy of subsequent error adjustment work, the key rotation angle of the error adjustment work can be determined by the maximum lift error value, and the subsequent adjustment work can be carried out around the key rotation angle and the maximum lift error value. Correspondingly, in order to ensure that the error adjustment work covers all areas of the camshaft where the lift error exists, the minimum rotation angle and the maximum rotation angle of the camshaft where the lift error exists should also be determined, and the rotation angle interval between the minimum rotation angle and the maximum rotation angle is determined as the error adjustment interval.

[0045] Step 130, obtaining the allowable error range of the camshaft, determining the error compensation parameter according to the allowable error range, and calculating the reference adjustment parameter according to the maximum lift error value and the error compensation parameter.

[0046] In actual work process, the cam lift curve of the camshaft has a certain allowable error range, and the machining equipment selected for machining the camshaft also inevitably has a certain machining error amount, so as to compensate for the machining error of the machining equipment and make the cam lift after machining fall within the allowable error range. In this embodiment, the error compensation parameter can be determined according to the allowable error range, and the reference adjustment parameter can be calculated according to the maximum lift error value and the error compensation parameter, so as to take the reference adjustment parameter as the error adjustment reference value of other rotation angles.

[0047] Specifically, when determining the error compensation parameter, one third of the allowable error range can be taken as the error compensation parameter, and when calculating the reference adjustment parameter, the difference between the maximum lift error value and one third of the allowable error range can be calculated, which is the reference adjustment parameter in this embodiment.

[0048] Step 140, determining the upstroke error rotation angle interval and the upstroke decay coefficient of the camshaft according to the minimum rotation angle and the key rotation angle, and determining the downstroke error rotation angle interval and the downstroke decay coefficient of the camshaft according to the key rotation angle and the maximum rotation angle.

[0049] When the reference adjustment parameter is determined, to ensure that the adjusted camshaft profile has good smoothness and to reduce the lift error values of the remaining rotation angles in the error adjustment interval, the embodiment can determine the upstroke error rotation angle interval and the downstroke error rotation angle interval according to the minimum rotation angle, the key rotation angle and the maximum rotation angle, and can determine the upstroke attenuation coefficient and the downstroke attenuation coefficient according to the size of the upstroke error rotation angle interval and the downstroke error rotation angle interval, so as to sequentially adjust all the lift error values in the error adjustment interval.

[0050] It should be noted that the attenuation coefficient in the embodiment has a negative correlation with the error rotation angle interval, that is, the larger the error rotation angle interval, the smaller the attenuation coefficient, and the adjustment speed of the corresponding lift error value will be correspondingly reduced, so that the cam lift in the error rotation angle interval is more smooth and gentle after adjustment. In addition, when determining the upstroke attenuation coefficient and the downstroke attenuation coefficient, it should be ensured that the upstroke attenuation coefficient can make the upstroke adjustment parameter corresponding to the minimum rotation angle tend to 0, and the downstroke attenuation coefficient can make the downstroke adjustment parameter corresponding to the maximum rotation angle tend to 0.

[0051] Optionally, to further improve the smoothness of the camshaft profile after completing the error adjustment, the embodiment can further add the following steps after the above steps:

[0052] Determine the positive acceleration rotation angle interval and the negative acceleration rotation angle interval according to the preset profile parameters of the camshaft, calculate the smoothness correction coefficient through the positive acceleration rotation angle interval and the negative acceleration rotation angle interval, and correct the upstroke attenuation coefficient and the downstroke attenuation coefficient according to the smoothness correction coefficient respectively.

[0053] Generally, the profile contour of the cam can be expressed by a composite sine parabola, and the two sine function curves of the function image abdominal section and the parabola curve of the top working section have an influence on the profile contour of the cam, wherein the first sine function curve is a one-half short-period sine function for reflecting the positive acceleration rotation interval of the cam, and the other sine function curve (a one-fourth long-period sine function) and the parabola curve of the top working section are used to reflect the negative acceleration rotation interval of the cam. In actual processing, to improve the smoothness of the cam profile, the designer will limit the ratio between the positive acceleration rotation angle interval and the negative acceleration rotation angle interval. Therefore, in the embodiment, the smoothness correction coefficient can be calculated according to the positive acceleration rotation angle interval and the negative acceleration rotation angle interval, and the upstroke attenuation coefficient and the downstroke attenuation coefficient can be corrected through the smoothness correction coefficient, so that the adjusted cam is more smooth and smooth.

[0054] Step 150, according to the uplink attenuation coefficient and the reference adjustment parameter, the uplink adjustment parameter corresponding to each rotation angle in the uplink error rotation angle interval is calculated, and according to the downlink attenuation coefficient and the reference adjustment parameter, the downlink adjustment parameter corresponding to each rotation angle in the downlink error rotation angle interval is calculated.

[0055] When the uplink attenuation coefficient and the downlink attenuation coefficient are determined, the adjustment parameters of each rotation angle can be calculated according to the reference adjustment parameter. When calculating, the number of remaining rotation angles between the current rotation angle and the key rotation angle should be determined first, then the attenuation coefficient multiple is determined according to the number of remaining rotation angles, and then the adjustment parameters of each rotation angle are calculated in combination with the reference adjustment parameter.

[0056] Specifically, when calculating the adjustment parameter of a certain rotation angle, the following formula can be used:

[0057] X = [1-(n+1)*A]*B

[0058] Where X is the adjustment parameter of a certain rotation angle, n is the number of remaining rotation angles between the current rotation angle and the key rotation angle, A is the attenuation coefficient, and B is the reference adjustment parameter.

[0059] Step 160, according to the actual profile parameters of the camshaft, the reference adjustment parameter, the uplink adjustment parameter and the downlink adjustment parameter, the adjustment profile parameters of the camshaft are determined, and the camshaft is processed according to the adjustment profile parameters of the camshaft.

[0060] When the reference adjustment parameter, the uplink adjustment parameter and the downlink adjustment parameter of the camshaft are determined, the difference between the actual profile parameters (i.e. the actual lift value corresponding to each rotation angle of the camshaft) and the reference adjustment parameter, the uplink adjustment parameter and the downlink adjustment parameter can be calculated. The difference obtained is the adjustment lift value corresponding to each rotation angle of the camshaft after completing error adjustment, that is, the adjustment profile parameters of the camshaft. The adjustment profile parameters are input into the corresponding machining equipment, and the camshaft with lift error can be machined again, so that the camshaft meets the actual use requirements.

[0061] The above method will be described below in conjunction with an example:

[0062] When adjusting the error of a certain camshaft, part of the data of the camshaft is shown in the following table:

[0063]

[0064]

[0065] Wherein 125 degrees is the minimum rotation angle where the generating error exists, 142 degrees is the critical rotation angle with the maximum lift error value of 0.041 mm, and 160 degrees is the maximum rotation angle where the generating error exists. The current camshaft has a tolerance range of ±0.015 mm, and thus the reference adjustment parameter (i.e. the adjustment parameter corresponding to 142 degrees in the table) is 0.031 mm. The uplink attenuation coefficient is determined in combination with the uplink error rotation angle interval and the smoothing correction coefficient, and the downlink attenuation coefficient is determined in combination with the downlink error rotation angle interval and the smoothing correction coefficient. The data in the "adjusted lift value" column in the above table can be obtained through the calculation of the reference adjustment parameter and the attenuation coefficient. The staff can input the data in the column into the numerical control grinding machine, so as to perform error adjustment processing on the current camshaft.

[0066] The embodiment can determine the minimum rotation angle where the lift error of the camshaft exists, the maximum rotation angle, the maximum lift error value, and the critical rotation angle corresponding to the maximum lift error value through the preset profile parameters and the actual profile parameters of the camshaft, and can calculate the reference adjustment parameter according to the maximum lift error value and the error compensation parameter, so as to reserve a margin for the inherent error of the machining equipment. Meanwhile, the adjustment parameters of other rotation angles of the camshaft can be calculated according to the uplink attenuation coefficient and the downlink attenuation coefficient, so as to generate reasonable adjustment profile parameters, so that the adjusted camshaft has a smooth profile contour, and the working effect of the valve train is improved.

[0067] Embodiment Two

[0068] Figure 2 The structure diagram of the camshaft cam lift curve error adjustment device provided by the embodiment two of the application is shown in Figure 2 The device comprises:

[0069] The acquisition module 210 is configured to acquire preset profile parameters and actual profile parameters of the camshaft, wherein the preset profile parameters comprise preset lift values corresponding to each rotation angle of the camshaft, and the actual profile parameters comprise actual lift values corresponding to each rotation angle of the camshaft.

[0070] The first determination module 220 is configured to determine the minimum rotation angle where the lift error of the camshaft exists, the maximum rotation angle, the maximum lift error value, and the critical rotation angle corresponding to the maximum lift error value according to the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft.

[0071] The first calculation module 230 is configured to acquire a tolerance range of the camshaft, determine an error compensation parameter according to the tolerance range, and calculate a reference adjustment parameter according to the maximum lift error value and the error compensation parameter.

[0072] The second determining module 240 is configured to determine an upstroke error rotation angle interval and an upstroke attenuation coefficient of the camshaft according to the minimum rotation angle and the key rotation angle, and determine a downstroke error rotation angle interval and a downstroke attenuation coefficient of the camshaft according to the key rotation angle and the maximum rotation angle;

[0073] The second calculating module 250 is configured to calculate upstroke adjustment parameters corresponding to each rotation angle in the upstroke error rotation angle interval according to the upstroke attenuation coefficient and the reference adjustment parameter, and calculate downstroke adjustment parameters corresponding to each rotation angle in the downstroke error rotation angle interval according to the downstroke attenuation coefficient and the reference adjustment parameter.

[0074] The third determining module 260 is configured to determine adjustment profile parameters of the camshaft according to the actual profile parameters of the camshaft, the reference adjustment parameters, the upstroke adjustment parameters and the downstroke adjustment parameters, and process the camshaft according to the adjustment profile parameters of the camshaft.

[0075] The camshaft cam lift curve error adjustment device provided by the embodiment can determine the minimum rotation angle, the maximum rotation angle, the maximum lift error value and the key rotation angle corresponding to the maximum lift error value of the camshaft with lift error through the cooperation of the obtaining module and the first determining module. The first calculating module can calculate the reference adjustment parameters according to the maximum lift error value and the error compensation parameters. The second determining module and the second calculating module can calculate adjustment parameters of other rotation angles of the camshaft according to the upstroke attenuation coefficient and the downstroke attenuation coefficient, so as to generate reasonable adjustment profile parameters, thereby adjusting and processing the camshaft with machining error.

[0076] On the basis of the above embodiment, the camshaft cam lift curve error adjustment device comprises:

[0077] The correction module is configured to determine a positive acceleration rotation angle interval and a negative acceleration rotation angle interval according to the preset profile parameters of the camshaft, calculate a smooth correction coefficient through the positive acceleration rotation angle interval and the negative acceleration rotation angle interval, and correct the upstroke attenuation coefficient and the downstroke attenuation coefficient respectively according to the smooth correction coefficient.

[0078] On the basis of the above embodiment, the camshaft cam lift curve error adjustment device comprises:

[0079] The judgment module is configured to judge whether the rotation direction of the camshaft is the same as the rotation direction of the machining equipment, and perform reverse sequence processing on the actual lift value corresponding to each rotation angle of the camshaft and the preset lift value corresponding to each rotation angle of the camshaft when the rotation direction of the camshaft is not the same as the rotation direction of the machining equipment.

[0080] On the basis of the above embodiment, the first calculating module comprises:

[0081] The error compensation parameter determination unit is configured to obtain a tolerance range of the camshaft, and take one third of the tolerance range as the error compensation parameter;

[0082] The reference adjustment parameter calculation unit is configured to calculate the reference adjustment parameter according to a difference between the maximum lift error value and one third of the tolerance range.

[0083] The camshaft cam lift curve error adjustment device provided by the embodiment of the present application can execute the camshaft cam lift curve error adjustment method provided by any of the embodiments of the present application, and has the corresponding function modules and beneficial effects of the execution method.

[0084] Embodiment three

[0085] The embodiment three of the present application further provides a storage medium containing computer executable instructions, which, when executed by a computer processor, are used to execute the camshaft cam lift curve error adjustment method provided by any of the above embodiments.

[0086] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium may, for example, be but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, device or apparatus.

[0087] The computer readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, in which a computer readable program code is borne. Such a propagated data signal can take on multiple forms, including but not limited to an electromagnetic signal, an optical signal or any suitable combination thereof. The computer readable signal medium can also be any computer readable medium that is not a computer readable storage medium and that can transmit, propagate or transport a program for use by or in connection with an instruction execution system, device or apparatus.

[0088] The computer readable media on which the program code can be carried can be any appropriate media including, but not limited to, wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0089] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0090] Note that the above merely describes the preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, reconfigurations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A method of camshaft cam profile error adjustment, characterized in that, The method comprises the following steps: acquiring preset profile parameters and actual profile parameters of the camshaft, the preset profile parameters comprising preset lift values corresponding to each rotation angle of the camshaft, and the actual profile parameters comprising actual lift values corresponding to each rotation angle of the camshaft; determining, according to the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft, a minimum rotation angle, a maximum rotation angle, a maximum lift error value and a key rotation angle corresponding to the maximum lift error value, at which the camshaft has lift errors; acquiring an allowable error range of the camshaft, taking one third of the allowable error range as an error compensation parameter, and calculating a reference adjustment parameter according to a difference between the maximum lift error value and the one third of the allowable error range; determining, according to the minimum rotation angle and the key rotation angle, an uplink error rotation angle interval and an uplink attenuation coefficient of the camshaft, and determining, according to the key rotation angle and the maximum rotation angle, a downlink error rotation angle interval and a downlink attenuation coefficient of the camshaft; calculating, according to the uplink attenuation coefficient and the reference adjustment parameter, uplink adjustment parameters corresponding to each rotation angle in the uplink error rotation angle interval, and calculating, according to the downlink attenuation coefficient and the reference adjustment parameter, downlink adjustment parameters corresponding to each rotation angle in the downlink error rotation angle interval; when adjusting the adjustment parameter of a certain rotation angle, the following formula is used for calculation: X = [1-(n+1)*A]*B wherein X is the adjustment parameter of the certain rotation angle, n is the number of the remaining rotation angles between the current rotation angle and the key rotation angle, A is the attenuation coefficient, and B is the reference adjustment parameter; the attenuation coefficient is negatively correlated with the error rotation angle interval, and when the uplink attenuation coefficient and the downlink attenuation coefficient are determined, the uplink adjustment parameter corresponding to the minimum rotation angle is made to approach 0 by the uplink attenuation coefficient, and the downlink adjustment parameter corresponding to the maximum rotation angle is made to approach 0 by the downlink attenuation coefficient; determining adjustment profile parameters of the camshaft according to the actual profile parameters of the camshaft, the reference adjustment parameter, the uplink adjustment parameters and the downlink adjustment parameters, and processing the camshaft according to the adjustment profile parameters of the camshaft.

2. The camshaft cam lobe profile error adjustment method of claim 1 wherein: After the uplink error rotation angle interval and the uplink attenuation coefficient of the camshaft are determined according to the minimum rotation angle and the key rotation angle, and the downlink error rotation angle interval and the downlink attenuation coefficient of the camshaft are determined according to the key rotation angle and the maximum rotation angle, the camshaft cam lift curve error adjustment method comprises the following steps: determining a positive acceleration rotation angle interval and a negative acceleration rotation angle interval according to the preset profile parameters of the camshaft, calculating a smooth correction coefficient through the positive acceleration rotation angle interval and the negative acceleration rotation angle interval, and respectively correcting the uplink attenuation coefficient and the downlink attenuation coefficient according to the smooth correction coefficient.

3. The method of claim 1, wherein: Before the minimum rotation angle, the maximum rotation angle, the maximum lift error value and the key rotation angle corresponding to the maximum lift error value, at which the camshaft has lift errors, are determined according to the actual lift values corresponding to each rotation angle of the camshaft and the preset lift values corresponding to each rotation angle of the camshaft, the camshaft cam lift curve error adjustment method comprises the following steps: The rotating direction of the camshaft is determined whether same as the rotating direction of the machining equipment, when the rotating direction of the camshaft is not same as the rotating direction of the machining equipment, the actual lift value corresponding to each rotating angle of the camshaft and the preset lift value corresponding to each rotating angle of the camshaft are processed in reverse order.

4. A storage medium containing computer-executable instructions for performing the camshaft cam lift curve error adjustment method of any one of claims 1-3 when executed by a computer processor.

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