Servo-driven engine camshaft detection device and method

Abstract

The invention discloses a servo-driven engine camshaft detection device and method, and the method comprises the steps: placing a to-be-detected camshaft at a detection station, and clamping two ends of the camshaft through a drive motor and a servo motor respectively; determining whether the camshaft model is accurate based on the length information fed back by the servo motor; if yes, a measuring head of the detection equipment is controlled to stretch out, and a driving motor is controlled to rotate to detect the camshaft; and if not, carrying out error-proofing alarm. The cam shaft is clamped through cooperative control of the servo motor and the driving motor, the model of the cam shaft is automatically identified in combination with length information, the detection process is triggered, and the detection device has the advantages that the compatibility of the detection device is improved, automatic model identification and mistake-proofing alarm are achieved, and the detection efficiency and accuracy are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine parts detection, and particularly relates to a servo-driven engine camshaft detection device and method. BACKGROUND

[0002] On the assembly production line, the detection of mechanical plunger type engine camshafts usually adopts ordinary cylinders for positioning and clamping, and then a motor is used to drive rotation to complete detection. This traditional detection method has obvious technical defects: first, the clamping position of the ordinary cylinder is fixed and cannot be self-adaptively adjusted according to the length changes of camshafts of different types, which leads to the fact that the detection device cannot be compatible with the mixed production requirements of camshafts of multiple types; second, the cylinder clamping mechanism lacks a precise position feedback mechanism and cannot accurately identify the actual length of the clamped camshaft, so that the type automatic identification and error prevention alarm functions cannot be realized. When the type is wrong, the problem cannot be found until the subsequent process, which not only causes rework and repair, but also seriously affects the production efficiency and product quality. These technical defects seriously restrict the automation level and production efficiency of engine camshaft detection.

[0003] The prior art needs to be improved in view of the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a servo-driven engine camshaft detection device and method, which has the advantages of improving the compatibility of the detection device, realizing type automatic identification and error prevention alarm, and improving detection efficiency and accuracy.

[0005] The technical scheme adopted by the present application is as follows: a servo-driven engine camshaft detection device, comprising a detection device, a driving motor, a servo motor and a control device, The detection device is used to control the probe to extend out to detect the camshaft after receiving a detection signal; The driving motor and the servo motor are used to clamp the two ends of the camshaft to be detected after receiving a clamping signal; the driving motor drives the camshaft to rotate after receiving a rotating signal; The control device is used to send a clamping signal to the driving motor and the servo motor, and to determine whether the type of the camshaft is accurate based on the length information fed back by the servo motor. If it is accurate, a detection signal is sent to the detection device and a rotating signal is sent to the driving motor. If it is not accurate, an error prevention alarm is given.

[0006] Further, the determination of whether the type of the camshaft is accurate based on the length information fed back by the servo motor comprises: Before the control device sends the clamping signal, the initial distance between the extended shaft end of the servo motor and the clamped shaft end of the driving motor is determined; After the camshaft is clamped, the extension length of the servo motor extension shaft is determined; The actual length of the camshaft is determined based on the initial distance and the extension length; The type of the camshaft corresponding to the actual length is compared with the type of the camshaft to be detected to determine whether the type of the camshaft is accurate.

[0007] Further, the extension length of the servo motor extension shaft is determined by the difference between the current position value recorded by the servo motor encoder and the zero position value.

[0008] Further, the actual length of the camshaft is the difference between the initial distance and the extension length.

[0009] Further, if the type corresponding to the actual length of the camshaft is consistent with the type of the camshaft to be detected, it is determined that the type of the camshaft is accurate, otherwise it is determined that the type of the camshaft is not accurate.

[0010] A method for detecting a camshaft of an engine driven by a servo, comprising the following steps: Place the camshaft to be detected in the detection station, and clamp the two ends of the camshaft by the drive motor and the servo motor respectively; Determine whether the type of the camshaft is accurate based on the length information fed back by the servo motor; If it is accurate, control the probe of the detection device to extend, and control the drive motor to rotate to detect the camshaft; If it is not accurate, an error prevention alarm is given.

[0011] Further, the determination of whether the type of the camshaft is accurate based on the length information fed back by the servo motor comprises: Before the camshaft is clamped, the initial distance between the end of the servo motor extension shaft and the end of the drive motor clamping shaft is determined; After the camshaft is clamped, the extension length of the servo motor extension shaft is determined; The actual length of the camshaft is determined based on the initial distance and the extension length; The type of the camshaft corresponding to the actual length is compared with the type of the camshaft to be detected to determine whether the type of the camshaft is accurate.

[0012] Further, the extension length of the servo motor extension shaft is determined by the difference between the current position value recorded by the servo motor encoder and the zero position value.

[0013] Further, the actual length of the camshaft is the difference between the initial distance and the extension length.

[0014] Further, if the type corresponding to the actual length of the camshaft is consistent with the type of the camshaft to be detected, it is determined that the type of the camshaft is accurate, otherwise it is determined that the type of the camshaft is not accurate.

[0015] The beneficial effects of the present application are: The present application solves the problems of traditional devices that cannot be compatible with multiple models and lack of automatic error prevention by automatically identifying the camshaft model and triggering the detection process through the cooperative control of the servo motor and the driving motor clamping the camshaft, and has the advantages of improving the compatibility of the detection device, realizing automatic identification and error prevention alarm of the model, and improving the detection efficiency and accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The detection flowchart of the present application. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present application and does not constitute a limitation on the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0018] The present application provides a servo-driven engine camshaft detection device, comprising a detection device, a driving motor, a servo motor and a control device. The detection device is used to control the probe to extend and detect the camshaft after receiving the detection signal; the driving motor and the servo motor are used to clamp the two ends of the camshaft to be detected after receiving the clamping signal; the driving motor drives the camshaft to rotate after receiving the rotation signal; the control device is used to send the clamping signal to the driving motor and the servo motor, and determine whether the camshaft model is accurate based on the length information fed back by the servo motor, if it is accurate, send the detection signal to the detection device and the rotation signal to the driving motor, if it is not accurate, perform error prevention alarm.

[0019] The detection device refers to a mechanism that can perform camshaft profile or phase detection, which can be implemented by a probe assembly with a displacement sensor, and its function is to extend the probe to contact the surface of the camshaft to obtain detection data after the detection signal is triggered. The driving motor refers to a motor with a rotating output shaft, which can be implemented by a servo motor or a stepper motor with a clamping jaw, and its function is to fix one end of the camshaft through the clamping shaft and drive it to rotate. The servo motor refers to a motor with position feedback function, which can be implemented by a servo motor with an encoder, and its function is to feed back the actual length information after clamping through the displacement change of the extending shaft. The control device refers to a controller that can process signals and perform logical judgment, which can be implemented by a PLC or an industrial computer, and its function is to calculate the actual length of the camshaft by receiving the feedback data of the servo motor and matching it with the preset model, and according to the mes information, the length of each model of camshaft can be input into the control device.

[0020] Specifically, when the camshaft is placed into the detection station, the control device first sends a clamping signal to the drive motor and the servo motor, which clamp the two ends of the camshaft in cooperation. The servo motor records the displacement change of the extended shaft during clamping and feeds back the length information to the control device. The control device determines the actual length of the camshaft by calculating the difference between the initial clamping distance and the extended length, and compares it with the standard length of the preset model. If the actual length is consistent with the target model, the detection device is triggered to extend the measuring head, and the drive motor drives the camshaft to rotate to complete the detection; if it is not consistent, an error prevention alarm is triggered immediately to prevent the subsequent detection process.

[0021] The present application replaces the cylinder with a servo motor, uses its adjustable stroke characteristics to clamp camshafts of different lengths, and calculates the actual length in real time through the displacement data feedback by the encoder, thereby completing the model verification before detection.

[0022] The present application realizes compatible clamping of camshafts of different lengths, supports mixed production of multiple varieties, and through the real-time feedback function of the servo motor, model errors can be identified and alarms triggered in the initial stage of detection, avoiding rework and delays caused by incorrect models entering the subsequent detection process, and improving detection efficiency and accuracy.

[0023] The present application further proposes a method for determining whether the camshaft model is accurate based on the length information feedback by the servo motor, comprising: determining the initial distance between the servo motor extended shaft end and the drive motor clamped shaft end before the control device sends a clamping signal; determining the extended length of the servo motor extended shaft after the camshaft is clamped; determining the actual length of the camshaft based on the initial distance and the extended length; comparing the model corresponding to the actual length of the camshaft with the model of the camshaft to be detected to determine whether the camshaft model is accurate.

[0024] Wherein, the initial distance refers to the reference distance between the servo motor and the drive motor clamping shaft end face before the clamping action starts, which can be measured by a laser ranging sensor or a contact displacement sensor, and the reference value is used as a reference for subsequent length calculation. The extension length refers to the displacement of the output shaft of the servo motor relative to the initial position after the clamping action is performed, which can be converted into a linear displacement by the number of rotations recorded by the built-in encoder of the servo motor, and the value reflects the axial movement distance of the servo shaft during clamping. The actual length refers to the camshaft axial size obtained by calculating the difference between the initial distance and the extension length, which can be achieved by using a subtracter or a built-in algorithm of the control device, and the calculation process converts the mechanical displacement into the actual size of the workpiece. This calculation process utilizes the high-precision closed-loop control characteristics of the servo motor to obtain displacement data in real time and eliminate the measurement error caused by mechanical limiting of the traditional air cylinder clamping. The model comparison refers to matching and verifying the actual length calculated with the preset model standard length, which can be achieved by using database query or threshold interval judgment method. This step is used to identify whether the measured workpiece meets the size characteristics of the target model.

[0025] Specifically, before the clamping action is performed, the initial distance between the servo motor and the drive motor clamping shaft end face is obtained by the measuring device as a reference value. When the camshaft is clamped, the servo motor output shaft produces axial displacement, and the displacement recorded by the encoder is converted into extension length data. The actual axial size of the clamped camshaft can be obtained by subtracting the extension length from the initial distance. The actual length data is input into the model matching system and compared with the target model standard length specified by the current production task. If the difference exceeds the allowable tolerance range, the error prevention alarm mechanism is triggered.

[0026] Through the above technical solution, the actual length of the camshaft can be automatically measured during clamping and the model verification can be completed, avoiding the rework of subsequent processes caused by workpiece model errors. The displacement feedback function of the servo motor is used to realize synchronous detection of the clamping position and the size of the workpiece, solving the problem that the traditional air cylinder clamping cannot identify the length of the workpiece. The model matching judgment can be completed during the clamping action, effectively preventing the wrong model workpiece from entering the detection process.

[0027] The displacement closed-loop control and encoder feedback of the servo motor can accurately record the displacement change during clamping, and the actual length of the camshaft can be directly calculated in combination with the initial reference distance, providing reliable data for subsequent model matching, thereby solving the problem that the traditional air cylinder clamping cannot identify the model of the camshaft and trigger the error prevention alarm, and avoiding rework and production delay caused by model errors.

[0028] The application further provides a technical scheme for determining whether the type of the camshaft is accurate or not by comparing the type corresponding to the actual length of the camshaft after clamping with the type of the camshaft to be detected.

[0029] The type corresponding to the actual length of the camshaft refers to type data obtained by matching the standard length interval corresponding to different types in the pre-stored database with the physical length of the camshaft after clamping, and the actual length can be calculated by recording the displacement of the servo motor encoder, and the type matching can be realized by combining the type-length table. The type of the camshaft to be detected refers to the target product type data set in the production plan, and the target product type data can be obtained by inputting the upper computer system or scanning the workpiece identification code, and is used to establish a detection reference value.

[0030] Specifically, after the clamping device completes the positioning of the camshaft, the displacement data of the servo motor is collected in real time, and the actual length of the camshaft is obtained by calculating the difference between the initial clamping distance and the extension amount after clamping. The length value is input into the type matching module and compared with the standard length range corresponding to the target type. When the actual length falls within the standard range of the target type, the system determines that the type is correct and allows the subsequent detection to be performed; if it exceeds the allowable error range, an error prevention alarm is triggered immediately to prevent the wrong type from entering the detection process.

[0031] The application can accurately identify type errors in the initial stage of camshaft detection, and avoid the loss of equipment idling and rework caused by the entry of wrong workpieces into the rotation detection link. The time node of interrupting the detection process is advanced to within a few seconds after clamping is completed, which effectively shortens the error processing period compared with the traditional method of waiting for the complete detection period to find errors.

[0032] Based on the above camshaft detection device, the application further provides a servo-driven engine camshaft detection method, as shown in Figure 1 The camshaft to be detected is placed in the detection station, and the two ends of the camshaft are clamped by the driving motor and the servo motor respectively; whether the type of the camshaft is accurate or not is determined based on the length information fed back by the servo motor; if it is accurate, the detection head of the detection equipment is controlled to extend, the driving motor is controlled to rotate, and the camshaft is detected, and after the detection is completed, the detection head is controlled to reset, the rotating motor is controlled to reset, and the driving motor is controlled to reset; if it is not accurate, an error prevention alarm is given.

[0033] The clamping of the driving motor and the servo motor refers to that the camshaft is clamped by the driving motor and the servo motor at two ends respectively, the driving motor is used for providing rotary power, and the servo motor is used for adjusting the clamping position. For example, the servo motor can drive the clamping jaw to move through a ball screw mechanism to realize position adjustment. The length information fed back by the servo motor refers to displacement change data recorded by the servo motor in the clamping process. For example, the servo motor encoder can record the difference between the current position and the zero position, and the actual length of the camshaft is obtained by calculating the initial distance and the displacement difference. The error prevention alarm refers to triggering an alarm signal when the camshaft model is inconsistent with the preset model. For example, a sound and light alarm device can be connected through a PLC control system to prompt the operator to handle the exception.

[0034] Specifically, after the camshaft is placed on the detection station, the servo motor adjusts the position of the clamping jaw according to the preset program, so that the clamping jaw is clamped together with the clamping jaw of the driving motor. During the clamping process, the servo motor encoder records the displacement difference, and the actual length of the camshaft is calculated in combination with the initial distance. The length is compared with the standard length corresponding to the preset model, and if they are consistent, the detection process is started: the measuring head is extended to scan the profile of the camshaft, the driving motor drives the camshaft to rotate to complete the full-circle detection; after the detection is completed, the measuring head is retracted, and the driving motor stops rotating. If the comparison result is inconsistent, an alarm is triggered immediately to prevent the subsequent detection process from being executed.

[0035] The present application synchronously completes length measurement and model matching in the clamping process through the closed-loop control characteristics of the servo motor, which not only realizes dynamic adjustment of the clamping position, but also avoids waste of detection resources caused by model errors.

[0036] Through the above technical solutions, the present application can adapt to the detection requirements of camshafts of different lengths, support mixed production of multiple varieties of workpieces on the same production line, effectively prevent incorrect workpieces from entering the detection process through real-time model verification, reduce rework, and improve detection efficiency.

[0037] The present application further proposes a method for determining whether the model of the camshaft is accurate based on the length information fed back by the servo motor, comprising: determining the initial distance between the shaft end portion extended by the servo motor and the shaft end portion clamped by the driving motor before the camshaft is clamped; determining the extension length of the shaft extended by the servo motor after the camshaft is clamped; determining the actual length of the camshaft based on the initial distance and the extension length; and comparing the model corresponding to the actual length of the camshaft with the model of the camshaft to be detected to determine whether the model of the camshaft is accurate.

[0038] Specifically, before the clamping operation, the servo motor is in the zero position, at which time the initial distance between the two clamping shaft ends is recorded by the position sensor. After the camshaft is placed in the detection station, the drive motor synchronizes with the servo motor to perform the clamping action, and the servo motor extends the shaft forward until the camshaft is clamped. During this process, the servo motor encoder records the displacement of the extended shaft in real time, and the difference between the zero position value is obtained to obtain the extension length. By subtracting the initial distance from the extension length, the actual length of the clamped camshaft can be accurately calculated. The actual length is input into the model database of the control device for matching, if it is consistent with the standard length of the preset model, the subsequent detection process is allowed; if there is a deviation, an error prevention alarm is triggered immediately.

[0039] The present application can dynamically adjust the clamping position and accurately measure the displacement by the closed-loop control characteristics of the servo motor, which not only realizes the compatible clamping of multiple models of camshafts, but also identifies the model error at the beginning of the detection process through the length calculation and model matching mechanism.

[0040] Through the above technical solution, the present application solves the model misjudgment problem caused by the inability of the traditional cylinder clamping device to measure the actual length of the camshaft, and avoids the rework delay caused by the wrong model entering the subsequent process. Through the displacement feedback and automatic calculation of the servo motor, the model verification can be completed immediately after the clamping is completed, ensuring that the production line only performs detection operations on the correct model of the camshaft, effectively improving the accuracy and continuity of the production process.

[0041] The present application further proposes that the extension length of the servo motor extension shaft is determined by the difference between the current position value and the zero position value recorded by the servo motor encoder. The servo motor encoder refers to a sensor for real-time monitoring of the rotation angle or linear displacement of the servo motor shaft, which can be realized by a rotary encoder or a linear encoder, which records the position change through a pulse signal to provide a data basis for calculating the extension length. The current position value refers to the shaft end position measurement value of the servo motor encoder fed back in real time after the clamping action is completed, which can be obtained by encoder pulse counting conversion and is used to represent the displacement of the servo motor shaft in the clamped state. The zero position value refers to the reference position of the servo motor extension shaft when the clamping action is not performed, which can be determined by initialization calibration or preset mechanical origin, and is used to eliminate the influence of installation error on length measurement. The difference is determined by subtracting the current position value from the zero position value through mathematical operation, which can be realized by using the built-in algorithm of the controller, and is used to dynamically calculate the extension amount of the servo motor shaft, and then deduce the actual length of the camshaft.

[0042] Specifically, before clamping the camshaft, the servo motor extends the shaft to the zero position, and the encoder records the zero position value as the reference. When the clamping action starts, the servo motor drives the extension shaft to move towards the camshaft until the clamping is completed. During this process, the encoder continuously records the real-time position of the shaft and takes the final position after clamping as the current position value. By calculating the difference between the current position value and the zero position value, the extension length of the servo motor shaft can be accurately obtained. Since the encoder has high resolution characteristics, the difference can accurately reflect the displacement change of the servo motor during clamping, thereby eliminating the measurement error caused by the inaccurate control of the traditional cylinder lock point.

[0043] Through the above technical solution, the present application can accurately obtain the extension length of the shaft during clamping through the closed-loop control characteristics of the servo motor, and then accurately calculate the actual length of the camshaft. This technical solution effectively solves the problem that the traditional cylinder clamping cannot identify the model of the camshaft, and avoids the rework and production delay caused by model errors.

[0044] The present application further proposes a technical solution that determines the model to be accurate if the actual length of the camshaft corresponds to the model of the camshaft to be detected, and otherwise determines the model to be inaccurate.

[0045] The model corresponding to the actual length refers to the mapping relationship between different camshaft models and standard lengths, which can be specifically realized by using a model-length comparison table pre-stored in the control device. The comparison table contains all the camshaft models allowed to be detected and their corresponding theoretical length ranges. The model of the camshaft to be detected refers to the preset model information input by the operator before detection, which can be specifically obtained through a human-computer interaction interface or a detection task data automatically issued by a production system. This information is used for comparison and verification with the actual measurement result.

[0046] Specifically, when the camshaft is clamped by the servo motor and the drive motor, the difference between the extension length recorded by the servo motor encoder and the initial distance is calculated as the actual length. The actual length is input into the model-length comparison table for matching. If the matching result is consistent with the preset model, the probe is allowed to extend and the rotation detection process is started. If the matching fails, an error prevention alarm is triggered immediately to prevent subsequent detection actions from being performed. This process verifies the real-time checking of the product model during the clamping stage through the correlation between the physical size and the model.

[0047] In some specific embodiments, the specifications of the camshaft are shown in Table 1, and the model-length comparison table can include a tolerance range to accommodate manufacturing errors, for example, allowing the actual length to fluctuate within ±0.5 millimeters of the theoretical value. The zero position value of the servo motor encoder can be updated through a regular calibration program to ensure the accuracy of length measurement.

[0048] Table 1 Camshaft specification-length table Through the above technical scheme, the present application can complete model identification at the moment when the camshaft is clamped, avoid the equipment idling caused by the error model product entering the detection process, eliminate the rework problem of the subsequent process caused by the model error, and shorten the error-proof response time of the detection process from several minutes of the traditional scheme to several seconds.

[0049] The present application further proposes that the camshaft type is defined as an intake camshaft and an exhaust camshaft in the detection method.

[0050] The intake camshaft refers to a shaft body for controlling the opening and closing time of the intake valve in the engine, and the structural length thereof is different according to the engine model, and different diameters or cam distributions can be used to achieve valve control. The exhaust camshaft refers to a shaft body for controlling the opening and closing time of the exhaust valve in the engine, and the structural length thereof is different from that of the intake camshaft, and different cam phases or profiles can be used to achieve exhaust timing adjustment.

[0051] Specifically, in the detection process, when the intake camshaft and / or the exhaust camshaft are placed in the detection station, the initial distance of the servo motor and the drive motor clamping the shaft end is recorded. After clamping, the extension length of the servo motor is calculated by the encoder difference, and the actual length is determined by the difference between the initial distance and the extension length. Since the standard lengths of the intake and exhaust camshafts are different, the actual length is mapped to the corresponding model database for comparison. If the actual length is consistent with the standard length corresponding to the target model, the detection process is allowed to continue; if not, an error-proof alarm is triggered to prevent the wrong model from entering the subsequent process. The actual detection of the intake camshaft and the exhaust camshaft can be performed simultaneously in one station, and the length of each camshaft is clamped by the corresponding drive motor and servo motor.

[0052] The present application can accommodate the detection requirements of two kinds of camshafts through dynamic clamping and length measurement of the servo motor, and realize front-end error-proofing through length-model mapping. Through the length measurement and model comparison mechanism, the wrong model is intercepted at the front end of the detection process, and the resource waste of the subsequent process is avoided.

[0053] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A camshaft detection device for a servodriven engine, characterized in that: The detection device, the driving motor, the servo motor and the control device are included, The detection device is used to control the probe to extend to detect the camshaft after receiving the detection signal; The driving motor and the servo motor are used to clamp the two ends of the camshaft to be detected after receiving the clamping signal; the driving motor drives the camshaft to rotate after receiving the rotating signal; The control device is used to send the clamping signal to the driving motor and the servo motor; based on the length information fed back by the servo motor, it is determined whether the camshaft model is accurate, if accurate, the detection signal is sent to the detection device, and the rotating signal is sent to the driving motor, if not accurate, an error prevention alarm is performed.

2. The engine camshaft detection apparatus driven by a servo according to claim 1, characterized by, The determination of whether the camshaft model is accurate based on the length information fed back by the servo motor comprises: Before the control device sends the clamping signal, the initial distance between the shaft end part extended by the servo motor and the shaft end part clamped by the driving motor is determined; After the camshaft is clamped, the extension length of the shaft extended by the servo motor is determined; The actual length of the camshaft is determined based on the initial distance and the extension length; The type corresponding to the actual length of the camshaft is compared with the type of the camshaft to be detected to determine whether the camshaft model is accurate.

3. An engine camshaft detection apparatus driven by a servo according to claim 2, characterized in that: The extension length of the shaft extended by the servo motor is determined by the difference between the current position value recorded by the servo motor encoder and the zero position value.

4. The engine camshaft detection apparatus driven by a servo motor according to claim 2, characterized by: The actual length of the camshaft is the difference between the initial distance and the extension length.

5. The servo-driven engine camshaft detection apparatus of claim 2, wherein: If the type corresponding to the actual length of the camshaft is consistent with the type of the camshaft to be detected, it is determined that the camshaft model is accurate, otherwise it is determined that the camshaft model is not accurate.

6. A servo-driven engine camshaft detection method, characterized in that: The camshaft to be detected is placed in the detection station, and the two ends of the camshaft are clamped by the driving motor and the servo motor respectively; Based on the length information fed back by the servo motor, it is determined whether the camshaft model is accurate; If accurate, the probe of the detection device is controlled to extend, and the driving motor is controlled to rotate to detect the camshaft; If not accurate, an error prevention alarm is performed.

7. The method of claim 6, wherein the engine camshaft is detected by a servo drive. The determination of whether the camshaft model is accurate based on the length information fed back by the servo motor comprises: Before the camshaft is clamped, the initial distance between the shaft end part extended by the servo motor and the shaft end part clamped by the driving motor is determined; After the camshaft is clamped, the extension length of the shaft extended by the servo motor is determined; The actual length of the camshaft is determined based on the initial distance and the extension length; The type corresponding to the actual length of the camshaft is compared with the type of the camshaft to be detected to determine whether the camshaft model is accurate.

8. The method of claim 7, wherein: The extension length of the shaft extended by the servo motor is determined by the difference between the current position value recorded by the servo motor encoder and the zero position value.

9. The method of claim 7, wherein: The actual length of the camshaft is the difference between the initial distance and the extension length.

10. The method of claim 7, wherein: If the type corresponding to the actual length of the camshaft is consistent with the type of the camshaft to be detected, it is determined that the camshaft model is accurate, otherwise it is determined that the camshaft model is not accurate.

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