Camshaft phase correction method and device and vehicle

Abstract

The invention discloses a camshaft phase correction method and device and a vehicle. According to the camshaft phase correction method, working data of a calibration prototype under a preset working condition are obtained in advance, and the camshaft phase of the calibration prototype under the preset working condition is obtained according to the working data of the calibration prototype under the preset working condition; when the to-be-tested engine meets the triggering condition, the camshaft phase of the to-be-tested engine under the preset working condition is obtained according to the working data of the to-be-tested engine under the preset working condition; calculating an actual phase deviation value between the camshaft phase of the to-be-measured engine under the preset working condition and the camshaft phase of the calibration model machine under the preset working condition; judging whether a difference value between the actual phase deviation value and an initial deviation value of the to-be-detected engine is greater than a preset threshold value or not; and if not, correcting the operation of the to-be-tested engine according to the actual phase deviation value when the to-be-tested engine operates next time. Intake and exhaust amount deviation caused by camshaft phase deviation of the engine can be reduced, and the engine can achieve the optimal combustion effect.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of engine technology, and in particular to a camshaft phase correction method, device and vehicle. Background Art

[0002] The camshaft is an important component in a piston engine. Its function is to control the opening and closing of the valves. The response performance of the internal combustion engine to the required engine power or required torque changes can be improved by means of dynamic control of the camshaft phase.

[0003] During the installation process, the engine intake and exhaust camshafts will inevitably introduce a series of errors, resulting in a certain deviation between the valve phase and the ideal position of the calibration prototype. This error is difficult to avoid and cannot be accurately identified. The impact of this deviation on the traditional Otto cycle is relatively small and will not cause too much deviation. However, with the development of the industry, more and more combustion designs using deep Miller cycles are being adopted, which also places higher requirements on engine control accuracy. Camshaft installation deviation is very difficult to measure. If the deviation is too large, it will cause intake deviation, which will have a direct impact on engine performance, fuel consumption, and emissions. Therefore, how to detect and correct camshaft deviation is important for vehicle design and later vehicle maintenance. Summary of the invention

[0004] The present invention provides a camshaft phase correction method, device and vehicle, so as to reduce the intake and exhaust volume deviation caused by the camshaft phase deviation of the engine, thereby saving the engine processing cost, optimizing the engine combustion and achieving energy conservation and emission reduction.

[0005] In a first aspect, an embodiment of the present invention provides a camshaft phase correction method, the method comprising:

[0006] Pre-acquire working data of the calibration prototype under a preset working condition, and obtain the camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition;

[0007] When the engine to be tested meets the trigger condition, the operating data of the engine to be tested under the preset working condition is obtained, and the camshaft phase of the engine to be tested under the preset working condition is obtained according to the operating data of the engine to be tested under the preset working condition;

[0008] Calculating an actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition;

[0009] Determine whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, correct the operation of the engine to be tested according to the actual phase deviation value when the engine to be tested runs next time; if so, correct the operation of the engine to be tested according to the previous phase deviation value of the engine to be tested when the engine to be tested runs next time.

[0010] In a second aspect, an embodiment of the present invention further provides a camshaft phase correction device, which is used to execute the camshaft phase correction method in any embodiment of the present invention, and the device includes:

[0011] A pre-calibration module, used to pre-acquire working data of a calibration prototype under a preset working condition, and obtain a camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition;

[0012] A data acquisition module, used for acquiring the working data of the engine under test under the preset working condition when the engine under test meets the trigger condition, and obtaining the camshaft phase of the engine under test under the preset working condition according to the working data of the engine under test under the preset working condition; wherein the trigger condition includes the first operation of the engine under test and the triggering of the vehicle diagnostic instrument;

[0013] A calculation module, used for calculating an actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition;

[0014] A judgment module is used to judge whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested runs next time; if so, the operation of the engine to be tested is corrected according to the previous phase deviation value of the engine to be tested when the engine to be tested runs next time.

[0015] In a third aspect, an embodiment of the present invention further provides a vehicle, which includes the camshaft phase correction device in any embodiment of the present invention.

[0016] The present invention provides a camshaft phase correction method, device and vehicle. When correcting the camshaft phase deviation, working data of a calibration prototype under a preset working condition is obtained in advance, and the camshaft phase of the calibration prototype under the preset working condition is obtained according to the working data of the calibration prototype under the preset working condition. When the engine to be tested meets the trigger condition, the camshaft phase of the engine to be tested under the preset working condition is obtained. By calculating the actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition, it is determined whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value. When the difference is less than the preset threshold value, the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested runs next time, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation occurring during the engine assembly process. The present invention detects the camshaft phase deviation by comparing the engine status under specific working conditions, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation of the engine, achieving precise control of the engine charging model, and further optimizing the engine's air-fuel ratio, fuel injection, ignition, torque control and other functions, thereby achieving the purpose of saving engine processing costs, optimizing engine combustion and achieving energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart of a camshaft phase correction method provided by an embodiment of the present invention.

[0018] Figure 2 A flow chart of another camshaft phase correction method provided by an embodiment of the present invention.

[0019] Figure 3 A flow chart of a method for acquiring the camshaft phase of an engine to be tested provided in an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the operating range of the Otto cycle and the Miller cycle performed by an engine in the prior art.

[0021] Figure 5 A schematic flow chart of a camshaft phase correction method provided in an embodiment of the present invention.

[0022] Figure 6 A flow chart of another camshaft phase correction method provided in an embodiment of the present invention.

[0023] Figure 7 A schematic structural diagram of a camshaft phase correction device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] The vehicle electronic control unit (ECU) is a comprehensive control device for the engine. By repeatedly optimizing the internal control parameters of the ECU, the working state of the engine during operation of the vehicle is optimized. The first step of ECU calibration is engine bench calibration, which is also the basis of vehicle calibration. However, due to the deviation of component installation accuracy, the state of the actual vehicle is inevitably different from the calibration prototype. This deviation is a single feature for the actual vehicle. It is time-consuming, labor-intensive and cost-intensive to reduce the error by improving assembly accuracy.

[0026] The embodiment of the present invention provides a camshaft phase correction method to solve the above technical problems. Figure 1 A flow chart of a camshaft phase correction method provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the transformer status monitoring and early warning method includes the following steps:

[0027] S110, pre-acquire working data of the calibration prototype under a preset working condition, and obtain a camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition.

[0028] Among them, the calibrated prototype refers to an engine that has been calibrated for control parameters of all working conditions of the engine in the engine bench test. Based on the calibrated control parameters, the calibrated prototype can exert the best performance of the engine and put the engine in the best working state.

[0029] Specifically, during the engine bench calibration test, a specific preset working condition is selected, the calibration prototype is operated under the preset working condition, and the working data of the calibration prototype under the preset working condition is obtained. According to the working data of the calibration prototype under the preset working condition, the camshaft phase of the calibration prototype under the preset working condition can be obtained by looking up the table, or the camshaft phase under the preset working condition can be obtained directly through the camshaft position sensor of the calibration prototype. It should be noted that during the calibration prototype heating test, a table can be established in which the operating data of the calibration prototype and the camshaft phase of the calibration prototype correspond to each other, so as to facilitate the camshaft phase corresponding to the calibration prototype under different operating conditions by looking up the table. The working data and camshaft phase of the calibration prototype under the preset working condition can be stored in the ECU of the vehicle in the form of MAP, so as to facilitate the vehicle to perform camshaft phase correction. Optionally, the working data of the calibration prototype under the preset working condition can include parameters such as the intake temperature, intake flow, charging slope, and residual exhaust gas partial pressure of the calibration prototype.

[0030] S120. When the engine to be tested meets the triggering condition, the operating data of the engine to be tested under the preset working condition is obtained, and the camshaft phase of the engine to be tested under the preset working condition is obtained according to the operating data of the engine to be tested under the preset working condition; wherein the triggering condition includes the first operation of the engine to be tested and the triggering of the vehicle diagnostic instrument.

[0031] Specifically, the vehicle diagnostic instrument is a diagnostic instrument of the vehicle where the engine to be tested is located, and the vehicle diagnostic instrument trigger is the vehicle diagnostic instrument triggering the camshaft phase correction. When the engine to be tested is running for the first time or the vehicle diagnostic instrument is triggered, the throttle opening and the ignition angle are controlled to make the engine to be tested work under preset conditions, so as to correct the camshaft phase of the engine to be tested, so that the subsequent operation of the engine to be tested is based on the corrected camshaft phase. Optionally, the first operation of the engine is a trigger condition for camshaft phase correction. When the engine to be tested is working under preset conditions, the working data of the engine to be tested under the preset conditions is obtained, and the camshaft phase of the engine to be tested under the preset conditions can be found by looking up the table, so as to facilitate the correction of the camshaft phase of the engine to be tested by calibrating the camshaft phase of the prototype under the preset conditions and the camshaft phase of the engine to be tested under the preset conditions.

[0032] S130, calculating an actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition.

[0033] Specifically, by calculating the difference between the camshaft phase of the engine under test under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition, the difference can be used as the actual phase deviation value between the camshaft phase of the engine under test under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition, so as to correct the camshaft phase of the engine under test. The engine under test may have abnormal operation during operation. In order to eliminate the abnormal operation, the camshaft phase of the engine under test under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition can be subtracted to determine whether the difference is within the set range, so as to determine whether the operation of the engine under test is abnormal. When the engine under test is running normally, the difference is used as the actual phase deviation value between the camshaft phase of the engine under test under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition, so as to correct the camshaft phase of the engine under test.

[0034] S140, determining whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, correcting the operation of the engine to be tested according to the actual phase deviation value when the engine to be tested runs next time; if so, correcting the operation of the engine to be tested according to the previous phase deviation value of the engine to be tested when the engine to be tested runs next time.

[0035] Among them, the initial deviation value of the engine to be tested is the actual installation deviation measured during the installation process of the engine to be tested. After the whole vehicle is off the assembly line, one machine and one data are recorded in the vehicle ECU, and the actual installation deviation is used as the initial deviation value of the camshaft phase of the engine to be tested. When the correction value of the initial deviation value of the camshaft phase is not read out from the programmable programmable read-only memory (EPROM) in the ECU, the initial deviation value of the engine to be tested is used as the camshaft phase correction value for correction, so as to ensure the accuracy of the valve timing and eliminate the consistency deviation caused by different machine phases.

[0036] Specifically, by judging whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value, if not, the actual phase deviation value is stored in the EPROM, and the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested is run next time, and if so, the data in the EPROM is read when the engine to be tested is run next time, and the operation of the engine to be tested is corrected with the last phase deviation value of the engine to be tested, so as to achieve the correction of the camshaft phase of the engine to be tested, and then reduce the intake and exhaust volume deviation caused by the camshaft phase deviation in the engine assembly process. By comparing the engine state of the engine to be tested and the calibration prototype under the preset working conditions to detect the camshaft phase deviation, the intake and exhaust volume deviation caused by the camshaft phase deviation of the engine is reduced, and the precise control of the engine charging model can be achieved, and then the engine air-fuel ratio, fuel injection, ignition and torque control functions are optimized, so as to save the engine processing cost, optimize the engine combustion and achieve energy saving and emission reduction.

[0037] An embodiment of the present invention provides a camshaft phase correction method. When correcting the camshaft phase deviation, working data of a calibration prototype under a preset working condition is obtained in advance, and the camshaft phase of the calibration prototype under the preset working condition is obtained according to the working data of the calibration prototype under the preset working condition. When the engine to be tested meets the trigger condition, the camshaft phase of the engine to be tested under the preset working condition is obtained, and the actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition is calculated, so as to determine whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value. When the difference is less than the preset threshold value, the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested runs next time, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation occurring during the engine assembly process. The present invention detects the camshaft phase deviation by comparing the engine status under specific working conditions, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation of the engine, achieving precise control of the engine charging model, and further optimizing the engine's air-fuel ratio, fuel injection, ignition, torque control and other functions, thereby achieving the purpose of saving engine processing costs, optimizing engine combustion and achieving energy conservation and emission reduction.

[0038] Figure 2 A flow chart of another camshaft phase correction method provided by an embodiment of the present invention, the method comprising:

[0039] S210, obtaining first preset working data of the calibration prototype under a first preset working condition, and obtaining the camshaft phase of the calibration prototype under the first preset working condition according to the first preset working data; obtaining second preset working data of the calibration prototype under a second preset working condition, and obtaining the camshaft phase of the calibration prototype under the second preset working condition according to the second preset working data; wherein the preset working condition includes the first preset working condition and the second preset working condition.

[0040] Specifically, during the engine bench calibration test, a specific plurality of preset operating conditions are selected, the preset operating conditions including a first preset operating condition and a second preset operating condition, and the operating data of the calibration prototype under the first preset operating condition and the second preset operating condition are respectively obtained. The camshaft phase of the calibration prototype under the first preset operating condition and the second preset operating condition can be obtained by table lookup based on the operating data of the calibration prototype under the first preset operating condition and the second preset operating condition, respectively. The camshaft phase deviation is detected by comparing the engine states under the first preset operating condition and the second preset operating condition, thereby correcting it, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation occurring during the assembly process.

[0041] S220: When the engine to be tested meets the trigger condition, obtain the working data of the engine to be tested under the preset working condition, and obtain the camshaft phase of the engine to be tested under the preset working condition according to the working data of the engine to be tested under the preset working condition.

[0042] Optional, Figure 3 A flow chart of a method for acquiring a camshaft phase of an engine to be tested provided in an embodiment of the present invention, wherein when the engine to be tested meets a trigger condition, working data of the engine to be tested under a preset working condition is acquired, and the camshaft phase of the engine to be tested under the preset working condition is obtained according to the working data of the engine to be tested under the preset working condition, including:

[0043] S310: When the engine to be tested meets the trigger condition, the throttle opening and the ignition angle of the engine to be tested are controlled so that the engine to be tested operates under the first preset working condition and the second preset working condition respectively.

[0044] Specifically, when the engine to be tested meets the triggering condition, that is, when the engine to be tested is running for the first time and the vehicle diagnostic instrument is triggered, the throttle opening and the ignition angle of the engine to be tested can be controlled by the vehicle ECU, so that the engine to be tested operates under the first preset operating condition and the second preset operating condition, respectively, thereby obtaining the working data of the engine to be tested under the first preset operating condition and the second preset operating condition.

[0045] S320, obtaining first working data of the engine to be tested under a first preset working condition, and obtaining the camshaft phase of the engine to be tested under the first preset working condition according to the first working data and the data phase comparison table; obtaining second working data of the engine to be tested under a second preset working condition, and obtaining the camshaft phase of the engine to be tested under the second preset working condition according to the second working data and the data phase comparison table. The data phase comparison table is a table in which the operating data of the calibration prototype corresponds to the camshaft phase of the calibration prototype one by one.

[0046] Among them, the data phase comparison table is a table in which the operating data of the calibration prototype corresponds to the camshaft phase of the calibration prototype one by one. During the heating test of the calibration prototype, a data phase comparison table in which the operating data of the calibration prototype corresponds to the camshaft phase of the calibration prototype one by one can be established, so that it is convenient to obtain the corresponding camshaft phase of the engine corresponding to the model of the calibration prototype under different operating conditions by looking up the data phase comparison table. The working data and camshaft phase of the calibration prototype under preset working conditions can be stored in the vehicle's ECU in the form of MAP to form a data phase comparison table, which is convenient for the vehicle to perform camshaft phase correction.

[0047] Specifically, by obtaining the first operating data of the engine to be tested under the first preset operating condition, the camshaft phase of the engine to be tested under the first preset operating condition can be obtained by looking up the data phase comparison table; the second operating data of the engine to be tested under the second preset operating condition is obtained, and the camshaft phase of the engine to be tested under the second preset operating condition is obtained by looking up the data phase comparison table, thereby facilitating the correction of the camshaft phase of the engine to be tested by calibrating the camshaft phase of the prototype under the preset operating condition and the camshaft phase of the engine to be tested under the preset operating condition.

[0048] In addition, the first working data of the engine to be tested under the first preset working condition is different from the first preset working data of the calibration prototype under the first preset working condition, and the corresponding camshaft phases are also different. The second working data of the engine to be tested under the second preset working condition is different from the second preset working data of the calibration prototype under the second preset working condition, and the corresponding camshaft phases are also different. By respectively comparing the camshaft phases of the calibration prototype under different preset working conditions and the camshaft phases of the engine to be tested under different preset working conditions, the camshaft phase of the engine to be tested can be corrected.

[0049] S230, calculating a first phase deviation value between the camshaft phase of the engine to be tested under a first preset operating condition and the camshaft phase of the calibration prototype under the first preset operating condition; calculating a second phase deviation value between the camshaft phase of the engine to be tested under a second preset operating condition and the camshaft phase of the calibration prototype under the second preset operating condition; wherein the preset operating conditions include the first preset operating condition and the second preset operating condition.

[0050] Specifically, the first phase deviation value is the difference between the camshaft phase of the engine to be tested under the first preset operating condition and the camshaft phase of the calibration prototype under the first preset operating condition; the second phase deviation value is the difference between the camshaft phase of the engine to be tested under the second preset operating condition and the camshaft phase of the calibration prototype under the second preset operating condition. The magnitude of the first phase deviation value and the second phase deviation value are related to the actual camshaft phase and operating state of the engine to be tested at this moment.

[0051] S240, determining whether the difference between the first phase deviation value and the second phase deviation value is less than or equal to a preset threshold; if so, calculating an average value of the first phase deviation value and the second phase deviation value, and taking the average value of the first phase deviation value and the second phase deviation value as the actual phase deviation value.

[0052] Specifically, when the running state of the engine to be tested is abnormal, the working data of the engine to be tested under the preset working condition may have a numerical abnormality. At this time, the camshaft phase obtained according to the working data of the engine to be tested under the preset working condition is different from the actual camshaft phase of the engine to be tested. Therefore, it is necessary to exclude the camshaft phase data when the running state of the engine to be tested is abnormal. By setting a preset threshold, it is determined whether the difference between the first phase deviation value and the second phase deviation value is less than or equal to the preset threshold, and the difference between the first phase deviation value and the second phase deviation value is limited within the preset threshold range. When the difference between the first phase deviation value and the second phase deviation value exceeds the preset threshold, it indicates that the running state of the engine to be tested under the first preset working condition or / and the second preset working condition is abnormal, and the engine to be tested needs to be re-run to the first preset working condition and the second preset working condition, so as to obtain the camshaft phase of the first preset working condition and the second preset working condition; when the difference between the first phase deviation value and the second phase deviation value is less than or equal to the preset threshold, it indicates that the camshaft phase of the engine to be tested under the first preset working condition and the camshaft phase under the second preset working condition obtained at this time are normal data, and the average value of the first phase deviation value and the second phase deviation value is calculated. By calculating the average value of the first phase deviation value and the second phase deviation value, and taking the average value of the first phase deviation value and the second phase deviation value as the actual phase deviation value, the actual phase deviation value obtained is closer to the real camshaft phase deviation value of the engine to be tested, thereby improving the accuracy of correcting the camshaft phase of the engine to be tested.

[0053] It should be noted that, in an embodiment of the present invention, the preset operating conditions may include not only the first preset operating condition and the second preset operating condition, but may also include a greater number of preset operating conditions, so that the camshaft phase data of the engine to be tested under more operating conditions can be obtained, so that the actual phase deviation value obtained can be further made close to the real camshaft phase deviation value of the engine to be tested, thereby further improving the accuracy of correcting the camshaft phase of the engine to be tested.

[0054] S250, determine whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, store the difference between the actual phase deviation value and the initial deviation value of the engine to be tested, and when the engine to be tested runs next time, correct the variable valve timing system of the engine to be tested according to the difference between the actual phase deviation value and the initial deviation value of the engine to be tested; if yes, when the engine to be tested runs next time, correct the variable valve timing system of the engine to be tested according to the previous phase deviation value of the engine to be tested.

[0055] Among them, before judging whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than the preset threshold value, the actual installation deviation of the camshaft phase of the engine to be tested must be measured during the installation process of the engine to be tested. After the whole vehicle is off the assembly line, one machine and one data are recorded in the vehicle ECU, and the actual installation deviation is used as the initial deviation value of the camshaft phase of the engine to be tested. When the camshaft phase initial deviation value correction value is not read out from the EPROM, this value is used as the camshaft phase correction value for correction, so as to ensure the accuracy of the valve timing and eliminate the consistency deviation caused by different machine phases.

[0056] Specifically, in order to further correct the camshaft phase of the engine to be tested and avoid the initial deviation value of the engine to be tested being inaccurate, the actual phase deviation value is compared with the initial deviation value of the engine to be tested to determine whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value. When the difference is less than or equal to the preset threshold value, the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is stored in an EPROM. When the engine to be tested runs next time, the variable valve timing system (Variable Valve Timing, VVT for short) of the engine to be tested is corrected according to the difference between the actual phase deviation value and the initial deviation value of the engine to be tested, thereby correcting the target VVT opening according to the actual phase deviation value obtained, and adjusting the operating deviation of the engine to be tested to normal. VVT adjusts the engine cam phase based on the actual phase deviation value and the initial deviation value of the engine to be tested, so that the intake volume of the engine to be tested changes with the change of the engine speed to be tested, so that the engine to be tested can achieve the same optimal combustion efficiency as the calibration prototype, realize precise control of the charging model, improve the fuel economy of the engine, and then optimize the air-fuel ratio, injection, ignition and torque control functions, so as to achieve the purpose of saving processing costs, optimizing combustion, energy conservation and emission reduction.

[0057] also, Figure 4 Schematic diagram of the working range of Otto cycle and Miller cycle performed by the engine in the prior art, such as Figure 4 As shown, Figure 4The figure shows the difference between the engine crankshaft angle and cylinder volume when the engine is in Otto cycle and deep Miller cycle. In the prior art, the closing position of the intake valve in the traditional Otto cycle is closer to the bottom dead center of the cylinder, and the valve phase deviation has a small impact on the estimation of the cylinder volume; the closing position of the intake valve in the deep Miller cycle is far away from the bottom dead center of the cylinder, and the valve phase deviation has a great impact on the estimation of the cylinder volume. Taking a certain vehicle model as an example, if the actual valve position deviates from the design value by 3°CA due to manufacturing reasons, the operating point at which the latter intake model meets the accuracy requirements will drop from 90% to 67%, the operating point at which the injection model meets the accuracy requirements will drop from 96% to 82%, and the operating point at which the torque model meets the accuracy requirements will drop from 95% to 46%. Therefore, it is necessary to correct the initial phase deviation. After obtaining the camshaft phase correction value, the intake and exhaust VVT target angles of the engine are controlled to be offset according to the deviation between the electrical signal and the calibration prototype, so as to achieve the expected result that the engine with phase deviation and the calibration prototype have the same intake state, while keeping the input angle during intake model calculation consistent with the calibration prototype. The change of target VVT can be achieved by adjusting the target VVT angle MAP, so that the engine can achieve the same optimal combustion efficiency as the calibration prototype, realize precise control of the engine charging model, and improve the fuel economy of the engine.

[0058] Figure 5 A schematic flow chart of a camshaft phase correction method provided by an embodiment of the present invention is shown in FIG. Figure 5As shown, first, the trigger condition is determined. The first operation of the engine is one trigger condition for camshaft phase correction, and the vehicle diagnostic instrument trigger is another trigger condition. When the engine to be tested is run for the first time or when the vehicle diagnostic instrument is triggered, the engine to be tested is placed at specific operating point 1 and specific operating point 2 by controlling the throttle valve and adjusting the ignition angle of the engine to be tested. The relationship between the difference in the deviation of the camshaft phases identified at the two operating points and the set threshold is determined. When the difference is greater than, less than or equal to the threshold, the two deviation values ​​are averaged to obtain the actual deviation average value; when the difference is greater than the threshold, return to the previous step and continue to collect the camshaft phases at specific operating point 1 and specific operating point 2, so as to obtain the normal camshaft phase data of the engine to be tested at specific operating point 1 and specific operating point 2. After the two deviation values ​​are averaged, the average value of the two deviation values ​​is used as the actual deviation average value, and the relationship between the difference between the actual deviation average value and the initial deviation and the set threshold is determined. When the difference between the actual deviation average value and the initial deviation is less than or equal to the threshold, the actual deviation average value is stored in the EPROM. The next time the engine is running, the target VVT opening is corrected according to the obtained phase deviation to adjust the deviation back; when the difference between the actual deviation average value and the initial deviation is greater than the threshold, it is not processed. The next time the engine is running, the target VVT opening will be corrected with the last phase deviation in the EPROM to adjust the deviation back. By comparing the engine state under specific working conditions to detect the camshaft phase deviation, it is corrected, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation in the engine assembly process, achieving precise control of the engine's charging model, and optimizing the air-fuel ratio, injection, ignition, and torque control functions, which can achieve the purpose of saving processing costs, optimizing combustion, and energy conservation and emission reduction. The camshaft phase correction method in the embodiment of the present invention selects a specific operating point, reads the relevant parameters of the operating point, calculates the camshaft phase at the current moment, and compares it with the phase of the calibrated prototype under the same state to obtain the phase deviation, so as to correct the initial actual deviation initially measured by the camshaft. Without increasing additional hardware costs, the engine intake and exhaust cam phase correction can be achieved through appropriate software, so that the engine's working process can be closer to the calibration prototype and achieve the best combustion effect.

[0059] The above-mentioned embodiment detects the camshaft phase deviation by comparing the engine status under specific working conditions, and corrects it, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation during the assembly process, achieving precise control of the charging model, and optimizing the air-fuel ratio, fuel injection, ignition, torque control and other functions, so as to achieve the purpose of saving processing costs, optimizing combustion, and saving energy and reducing emissions.

[0060] The embodiment of the present invention also provides another camshaft phase correction method. Figure 6A flowchart of another camshaft phase correction method provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the method includes:

[0061] S410: When the engine to be tested meets the trigger condition, when the engine to be tested is in the first operating condition, a calibrated air intake volume and an actual air intake volume of a throttle valve of the engine to be tested are obtained.

[0062] Among them, when the engine to be tested is in the first working condition, the throttle intake pressure and exhaust pressure of the engine to be tested are both less than or equal to 0.528. When the pressure before and after the throttle is below 0.528, the flow velocity is equal to the speed of sound, and the intake flow rate is only related to the throttle opening. In this state, the secondary filling model of the engine is not affected by the camshaft deviation, and the main filling model of the engine is not affected by the camshaft deviation. Then, the connection between the engine to be tested and the calibration prototype can be established, and the deviation state between them can be calculated. The calibrated intake volume of the throttle of the engine to be tested is the intake volume of the throttle of the calibration prototype in the first working condition, which can be pre-stored in the vehicle where the engine to be tested is located. The actual intake volume of the throttle of the engine to be tested can be calculated by the engine intake flow calculation formula. Exemplarily, the engine intake flow calculation formula is:

[0063] msdk=MSNWDK(wdkba)·fpvdk·ftvdk·KLAF(ps / pvdk);

[0064] Among them, mdk is the intake flow rate, wdkba is the throttle opening; fpvdk is the intake pressure correction coefficient; ftvdk is the intake temperature correction coefficient after the throttle pressure; ps / pvdk is the pressure ratio before and after the throttle, ps is the intake pressure of the throttle, pvdk is the exhaust pressure of the throttle, MSNWDK and KLAF are calculation functions. Through the above engine intake flow calculation formula, the actual intake volume of the engine throttle can be calculated according to the engine throttle opening and the pressure before and after the throttle.

[0065] Specifically, since the engine may experience certain wear and tear during operation, the camshaft phase of the engine in the vehicle may change after the vehicle has been running for a period of time, resulting in poor engine performance. At this time, the vehicle's diagnostic instrument will trigger a phase deviation correction, that is, the engine to be tested meets the triggering condition, so the diagnostic instrument of the vehicle where the engine to be tested is located triggers the phase deviation correction, which can be a trigger condition for the camshaft phase correction of the engine to be tested. When the diagnostic instrument of the vehicle triggers the phase deviation correction, when the engine to be tested is in the first working condition, the calibrated intake volume and actual intake volume of the throttle of the engine to be tested are obtained, thereby calculating the deviation between the calibrated intake volume and actual intake volume of the throttle of the engine to be tested.

[0066] Optionally, when the diagnostic instrument of the vehicle triggers the phase deviation correction, when the engine to be tested is in the first working condition, obtaining the calibrated air intake volume and the actual air intake volume of the throttle of the engine to be tested specifically includes:

[0067] When the calibration prototype is in a first operating condition, the air intake volume of the throttle of the calibration prototype in the first operating condition is obtained, and the air intake volume of the throttle of the calibration prototype in the first operating condition is used as the calibrated air intake volume of the throttle of the engine to be tested; when the engine to be tested is in the first operating condition, the calibrated air intake volume and the actual air intake volume of the throttle of the engine to be tested are obtained.

[0068] Wherein, when the calibration prototype and the engine to be tested are in the first working condition, the throttle intake pressure and exhaust pressure of the calibration prototype and the engine to be tested are both less than or equal to 0.528.

[0069] Specifically, during the engine bench calibration stage, the calibration prototype is placed in a first operating condition. When the calibration prototype is in the first operating condition, multiple secondary-stroke model intake volumes and corresponding main-stroke model intake volumes of the throttle of the calibration prototype under the first operating condition are obtained, and the main-stroke model intake volume is used as the calibrated intake volume of the throttle of the engine to be tested, and a comparison table of multiple secondary-stroke model intake volumes and corresponding main-stroke model intake volumes of the throttle of the calibration prototype under the first operating condition is stored in the vehicle's EPROM.

[0070] When the engine to be tested is in the first operating condition, the secondary-stroke model intake volume and the actual main-stroke model intake volume of the engine to be tested are measured and obtained, and based on the secondary-stroke model intake volume of the engine to be tested, the corresponding calibrated intake volume is obtained from a comparison table of multiple secondary-stroke model intake volumes and corresponding main-stroke model intake volumes of the throttle of the calibration prototype under the first operating condition, thereby calculating the deviation between the calibrated intake volume and the actual intake volume of the throttle of the engine to be tested.

[0071] Optionally, by calibrating the primary and secondary charging models of the engine to be tested and the calibration prototype, an intake volume deviation and intake phase deviation comparison table of the engine to be tested can be calibrated.

[0072] Among them, the intake volume deviation and intake phase deviation comparison table is a comparison table of the intake flow deviation and the camshaft phase angle deviation of the engine to be tested. After calculating the deviation between the calibrated intake volume and the actual intake volume of the throttle of the engine to be tested, the camshaft phase angle deviation of the engine to be tested can be obtained based on the intake volume deviation and intake phase deviation comparison table of the engine to be tested.

[0073] S420, calculating the intake volume deviation between the calibrated intake volume and the actual intake volume, obtaining the camshaft phase difference between the current calibration prototype and the engine to be tested by looking up the comparison table of the intake flow deviation and the camshaft phase angle deviation of the engine to be tested, and judging whether the camshaft phase difference between the current calibration prototype and the engine to be tested is greater than a preset threshold; if not, determining the camshaft phase difference between the current calibration prototype and the engine to be tested according to the comparison table of the intake volume deviation and the intake phase deviation, and correcting the operation of the engine to be tested according to the camshaft phase difference between the current calibration prototype and the engine to be tested.

[0074] Specifically, after calculating the intake volume deviation between the calibrated intake volume and the actual intake volume, a threshold is set. If the deviation is within the threshold, the camshaft phase difference between the current calibrated prototype and the engine to be tested can be determined by looking up the comparison table of the intake flow deviation and the camshaft phase angle deviation of the engine to be tested. The camshaft phase correction value is stored in the EPROM. When the engine to be tested is run next time, the operation of the engine to be tested is corrected according to the camshaft phase difference between the current calibrated prototype and the engine to be tested.

[0075] S430: If yes, when the engine to be tested runs next time, the operation of the engine to be tested is corrected by using the last phase deviation value of the engine to be tested.

[0076] Specifically, when the intake amount deviation between the calibrated intake amount and the actual intake amount is greater than a threshold, no processing is performed. The next time the engine to be tested runs, the target VVT opening will be corrected with the last phase deviation in the EPROM to adjust the deviation back.

[0077] The above practical example can realize the camshaft phase correction of the engine through the vehicle diagnostic instrument without adding additional hardware costs, and detect and correct the camshaft deviation during the later maintenance of the vehicle, providing an effective method and measure for vehicle maintenance. It also reduces the intake and exhaust volume deviation caused by the camshaft phase deviation during the operation of the engine, realizes the precise control of the charging model, and then optimizes the air-fuel ratio, injection, ignition and torque control functions, which can achieve the purpose of saving processing costs, optimizing combustion, and saving energy and reducing emissions.

[0078] The embodiment of the present invention provides a camshaft phase correction method, and the embodiment of the present invention can achieve the following technical effects: 1. Correcting the phase deviation through the deviation of parameters such as gas volume between the actual vehicle and the calibration prototype at the same operating point; 2. Correcting the phase deviation by comparing the gas volume deviation of the primary and secondary charging models at the same operating point; 3. By identifying the gas volume deviation to intuitively reflect the combustion effect and then control the phase correction of the camshaft, so that the function of the actual vehicle is as close as possible to the calibration prototype, and the engine's charging, fuel injection, torque and other functions are controlled to achieve the best effect.

[0079] The embodiment of the present invention further provides a camshaft phase correction device, which is used to execute the camshaft phase correction method in any embodiment of the present invention. Figure 7 A schematic diagram of the structure of a camshaft phase correction device provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, the device comprises:

[0080] The pre-calibration module 110 is used to pre-acquire the working data of the calibration prototype under the preset working condition, and obtain the camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition.

[0081] The data acquisition module 120 is used to obtain the working data of the engine under test under the preset working conditions when the engine under test meets the trigger conditions, and obtain the camshaft phase of the engine under test under the preset working conditions according to the working data of the engine under test under the preset working conditions; wherein the trigger conditions include the first operation of the engine under test and the triggering of the diagnostic instrument.

[0082] The calculation module 130 is used to calculate the actual phase deviation between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration sample under the preset working condition.

[0083] The judgment module 140 is used to judge whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested runs next time; if so, the operation of the engine to be tested is corrected according to the previous phase deviation value of the engine to be tested when the engine to be tested runs next time.

[0084] Specifically, the pre-calibration module 110 can pre-acquire the working data of the calibration prototype under the preset working conditions. During the engine bench calibration test, a specific preset working condition is selected to make the calibration prototype run under the preset working condition, so that the working data of the calibration prototype under the preset working condition can be obtained. The working data of the calibration prototype under the preset working condition and the camshaft phase can be stored in the ECU of the vehicle in the form of MAP. According to the working data of the calibration prototype under the preset working condition, the camshaft phase of the calibration prototype under the preset working condition can be obtained by looking up the table, or the camshaft phase under the preset working condition can be obtained directly through the camshaft position sensor of the calibration prototype. When the engine to be tested is running for the first time or the vehicle diagnostic instrument is triggered, the data acquisition module 120 controls the throttle opening and the ignition angle to make the engine to be tested work under the preset working condition, so as to correct the camshaft phase of the engine to be tested, so that the subsequent operation of the engine to be tested is based on the corrected camshaft phase. The calculation module 130 calculates the difference between the camshaft phase of the engine under test under the preset working condition and the camshaft phase of the calibration sample under the preset working condition, and can use this difference as the actual phase deviation value of the camshaft phase of the engine under test under the preset working condition and the camshaft phase of the calibration sample under the preset working condition, so as to correct the camshaft phase of the engine under test. The judgment module 140 judges whether the difference between the actual phase deviation value and the initial deviation value of the engine under test is greater than the preset threshold value. If not, the operation of the engine under test is corrected according to the actual phase deviation value when the engine under test runs next time. If so, the operation of the engine under test is corrected according to the last phase deviation value of the engine under test when the engine under test runs next time, so as to realize the correction of the camshaft phase of the engine under test, and then reduce the intake and exhaust volume deviation caused by the camshaft phase deviation in the engine assembly process. By comparing the engine states of the engine to be tested and the calibration prototype under preset working conditions to detect the camshaft phase deviation, the intake and exhaust volume deviation caused by the camshaft phase deviation of the engine can be reduced, and precise control of the engine charging model can be achieved, thereby optimizing the engine's air-fuel ratio, fuel injection, ignition, torque control and other functions, thereby saving engine processing costs, optimizing engine combustion and achieving energy conservation and emission reduction.

[0085] An embodiment of the present invention provides a camshaft phase correction device. When correcting the camshaft phase deviation, a pre-calibration module pre-acquires working data of a calibration prototype under preset working conditions, and obtains the camshaft phase of the calibration prototype under the preset working conditions based on the working data of the calibration prototype under the preset working conditions. When the engine to be tested meets a trigger condition, a data acquisition module acquires the camshaft phase of the engine to be tested under the preset working conditions. A calculation module calculates an actual phase deviation value between the camshaft phase of the engine to be tested under the preset working conditions and the camshaft phase of the calibration prototype under the preset working conditions. A judgment module thereby judges whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value. When the difference is less than the preset threshold value, the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested runs next time, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation occurring during the engine assembly process. The present invention detects the camshaft phase deviation by comparing the engine status under specific working conditions, thereby reducing the intake and exhaust volume deviation caused by the camshaft phase deviation of the engine, achieving precise control of the engine charging model, and further optimizing the engine's air-fuel ratio, fuel injection, ignition, torque control and other functions, thereby achieving the purpose of saving engine processing costs, optimizing engine combustion and achieving energy conservation and emission reduction.

[0086] The embodiment of the present invention also provides a vehicle, including the camshaft phase correction device in the above embodiment, which can achieve the same technical effect as the camshaft phase correction device in the above embodiment. The camshaft phase correction device can achieve camshaft phase correction, so that the vehicle can achieve engine intake and exhaust cam phase correction through appropriate software without adding additional hardware costs, so that the working process of the engine is closer to the calibration prototype and achieves the best combustion effect.

[0087] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A camshaft phase correction method, characterized in that: Methods include: Pre-acquire working data of the calibration prototype under a preset working condition, and obtain the camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition; When the engine to be tested meets the trigger condition, the operating data of the engine to be tested under the preset working condition is obtained, and the camshaft phase of the engine to be tested under the preset working condition is obtained according to the operating data of the engine to be tested under the preset working condition; wherein the trigger condition includes the first operation of the engine to be tested and the triggering of the vehicle diagnostic instrument; Calculating an actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition; Determine whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, correct the operation of the engine to be tested according to the actual phase deviation value when the engine to be tested runs next time; if so, correct the operation of the engine to be tested according to the previous phase deviation value of the engine to be tested when the engine to be tested runs next time.

2. The camshaft phase correction method according to claim 1, characterized in that: The calculating of the actual phase deviation between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration sample under the preset working condition comprises: Calculating a first phase deviation value between the camshaft phase of the engine to be tested under a first preset operating condition and the camshaft phase of the calibration prototype under the first preset operating condition; calculating a second phase deviation value between the camshaft phase of the engine to be tested under a second preset operating condition and the camshaft phase of the calibration prototype under the second preset operating condition; wherein the preset operating conditions include the first preset operating condition and the second preset operating condition; Determine whether the difference between the first phase deviation value and the second phase deviation value is less than or equal to the preset threshold; If yes, then an average value of the first phase deviation value and the second phase deviation value is calculated, and the average value of the first phase deviation value and the second phase deviation value is used as the actual phase deviation value.

3. The camshaft phase correction method according to claim 1, characterized in that: The step of pre-acquiring the working data of the calibration prototype under the preset working condition, and obtaining the camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition, comprises: Acquiring first preset working data of the calibration prototype under a first preset working condition, and obtaining a camshaft phase of the calibration prototype under the first preset working condition according to the first preset working data; Acquire second preset working data of the calibration prototype under a second preset working condition, and obtain the camshaft phase of the calibration prototype under the second preset working condition according to the second preset working data; wherein the preset working condition includes the first preset working condition and the second preset working condition.

4. The camshaft phase correction method according to claim 3, characterized in that: When the engine to be tested meets the trigger condition, obtaining the working data of the engine to be tested under the preset working condition, and obtaining the camshaft phase of the engine to be tested under the preset working condition according to the working data of the engine to be tested under the preset working condition, comprises: When the engine to be tested meets the trigger condition, the engine to be tested is operated under the first preset working condition and the second preset working condition respectively by controlling the throttle opening and the ignition angle of the engine to be tested; Acquire the first working data of the engine to be tested under the first preset working condition, and obtain the camshaft phase of the engine to be tested under the first preset working condition according to the first working data and the data phase comparison table; acquire the second working data of the engine to be tested under the second preset working condition, and obtain the camshaft phase of the engine to be tested under the second preset working condition according to the second working data and the data phase comparison table. The data phase comparison table is a table in which the operating data of the calibration prototype corresponds to the camshaft phase of the calibration prototype in a one-to-one manner.

5. The camshaft phase correction method according to claim 1, characterized in that: Before the pre-acquisition of the working data of the calibration prototype under the preset working conditions, the method further includes: The actual installation deviation of the camshaft of the engine to be tested is measured as an initial deviation value of the engine to be tested.

6. The camshaft phase correction method according to claim 1, characterized in that: Determining whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold; if not, correcting the operation of the engine to be tested according to the actual phase deviation value when the engine to be tested runs next time; If yes, when the engine to be tested runs next time, the operation of the engine to be tested is corrected by using the last phase deviation value of the engine to be tested, including: Determining whether a difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold; If not, storing the difference between the actual phase deviation value and the initial deviation value of the engine to be tested, and correcting the variable valve timing system of the engine to be tested according to the difference between the actual phase deviation value and the initial deviation value of the engine to be tested when the engine to be tested runs next time; If so, when the engine to be tested runs next time, the variable valve timing system of the engine to be tested is corrected according to the last phase deviation value of the engine to be tested.

7. The camshaft phase correction method according to claim 1, characterized in that: Also includes: When the engine to be tested meets the trigger condition, when the engine to be tested is in a first operating condition, obtaining a calibrated air intake amount and an actual air intake amount of a throttle valve of the engine to be tested; Calculating the intake amount deviation between the calibrated intake amount and the actual intake amount, obtaining the camshaft phase difference between the current calibrated prototype and the engine to be tested by looking up the comparison table of the intake flow deviation and the camshaft phase angle deviation of the engine to be tested, and judging whether the camshaft phase difference between the current calibrated prototype and the engine to be tested is greater than a preset threshold; If not, determining the camshaft phase difference between the current calibration prototype and the engine to be tested according to the intake amount deviation and intake phase deviation comparison table, and correcting the operation of the engine to be tested according to the camshaft phase difference between the current calibration prototype and the engine to be tested; If so, when the engine to be tested runs next time, the last phase deviation value of the engine to be tested is used to correct the operation of the engine to be tested.

8. The camshaft phase correction method according to claim 7, characterized in that: The step of obtaining a calibrated air intake amount and an actual air intake amount of a throttle valve of the engine to be tested when the engine to be tested is in a first working condition comprises: When the calibration prototype is in the first working condition, obtaining the air intake amount of the throttle of the calibration prototype under the first working condition, and using the air intake amount of the throttle of the calibration prototype under the first working condition as the calibrated air intake amount of the throttle of the engine to be tested; When the engine to be tested is in the first working condition, obtaining a calibrated air intake amount and an actual air intake amount of a throttle valve of the engine to be tested; Wherein, when the calibration prototype and the engine to be tested are in the first working condition, the throttle intake pressure and exhaust pressure of the calibration prototype and the engine to be tested are both less than or equal to 0.

528.

9. A camshaft phase correction device, characterized in that: The camshaft phase correction device is used to perform the camshaft phase correction method according to any one of claims 1 to 8, and the camshaft phase correction device comprises: A pre-calibration module, used to pre-acquire working data of a calibration prototype under a preset working condition, and obtain a camshaft phase of the calibration prototype under the preset working condition according to the working data of the calibration prototype under the preset working condition; A data acquisition module, used for acquiring the working data of the engine under test under the preset working condition when the engine under test meets the trigger condition, and obtaining the camshaft phase of the engine under test under the preset working condition according to the working data of the engine under test under the preset working condition; wherein the trigger condition includes the first operation of the engine under test and the triggering of the diagnostic instrument; A calculation module, used for calculating an actual phase deviation value between the camshaft phase of the engine to be tested under the preset working condition and the camshaft phase of the calibration prototype under the preset working condition; A judgment module is used to judge whether the difference between the actual phase deviation value and the initial deviation value of the engine to be tested is greater than a preset threshold value; if not, the operation of the engine to be tested is corrected according to the actual phase deviation value when the engine to be tested runs next time; if so, the operation of the engine to be tested is corrected according to the previous phase deviation value of the engine to be tested when the engine to be tested runs next time.

10. A vehicle, characterized in that: Includes the camshaft phase correction device as described in claim 9.

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