A method and system for testing the life of a vehicle's turbocharger tie rod.

Abstract

This invention provides a method for testing the lifespan of a vehicle's turbocharger tie rod, relating to the field of lifespan testing. The method includes: controlling the vehicle to travel a preset total mileage under preset road conditions and preset operating conditions; obtaining a first rocker arm rotation angle of the actuator rocker arm, and obtaining the total rotation angle of the turbocharger tie rod based on the first rocker arm rotation angle; determining that the turbocharger tie rod's lifespan meets requirements when the allowable total rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod. This method for testing the lifespan of a turbocharger tie rod can test its lifespan and can more easily obtain the rotation angle of the turbocharger tie rod. This invention also provides a system for testing the lifespan of a turbocharger tie rod to implement the above-described lifespan testing method.

Description

Technical Field

[0001] This invention relates to the field of life testing, and more particularly to a life testing method and system for a vehicle turbocharger tie rod. Background Technology

[0002] The vehicle's exhaust gas supercharging system can use the exhaust gas discharged from the engine to drive the impeller in the intake manifold to rotate, thereby improving the engine's intake capacity. The exhaust gas supercharging system has an exhaust gas bypass passage in its pipeline, and the exhaust gas bypass passage has an exhaust gas bypass valve. By controlling the opening degree of the bypass valve, the proportion of exhaust gas that participates in driving the impeller to rotate can be controlled.

[0003] In the relevant exhaust gas boosting system, the exhaust gas bypass valve is driven by a multi-link structure. This connection structure includes an actuator rocker arm connected to the actuator, a booster rocker arm connected to the exhaust gas bypass valve, and a booster tie rod connecting the actuator rocker arm and the booster rocker arm. The booster tie rod needs to continuously bear dynamic loads during operation and will be affected by the high temperature of the exhaust gas, which may lead to fatigue failure. Therefore, the life of the booster tie rod needs to be tested. Summary of the Invention

[0004] This invention provides a method and system for testing the lifespan of a vehicle's turbocharger tie rod, addressing the technical problem of how to test the lifespan of a turbocharger.

[0005] This invention provides a method for testing the lifespan of a vehicle's turbocharger linkage. The method includes: controlling the vehicle to travel a preset total mileage under preset road conditions and preset operating conditions; obtaining a first rocker arm rotation angle of the actuator rocker arm, and obtaining the total rotation angle of the turbocharger linkage based on the first rocker arm rotation angle; and determining that the lifespan of the turbocharger linkage meets the requirements when the allowable total rotation angle of the turbocharger linkage is greater than the total rotation angle of the turbocharger linkage.

[0006] Furthermore, the actuator rocker arm has a voltage sensor. The process of acquiring the first rocker arm rotation angle and obtaining the total rotation angle of the booster rod based on the first rocker arm rotation angle includes: acquiring a first angle and corresponding first voltage when the actuator rocker arm is at the mechanical top dead center, and a second angle and corresponding second voltage when the actuator rocker arm is at the mechanical bottom dead center; calculating a slope relationship based on the first angle and first voltage, and the second angle and second voltage, and constructing a linear function of the actuator rocker arm rotation angle and the voltage using the slope relationship; acquiring voltage by the voltage sensor at preset intervals, and obtaining the actuator rocker arm rotation angle based on the linear function, using the difference between the current rotation angle and the previous rotation angle as the single rotation angle of the actuator rocker arm; and obtaining the total rotation angle of the booster rod through the single rotation angles of each actuator rocker arm.

[0007] Furthermore, obtaining the total rotation angle of the booster rod through the single rotation angle of each actuator rocker arm includes: obtaining the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; dividing the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio; summing the absolute values ​​of the single rotation angles of each actuator rocker arm to obtain the first rocker arm total rotation angle; and multiplying the first rocker arm total rotation angle by the rotation angle ratio to obtain the total rotation angle of the booster rod.

[0008] Furthermore, obtaining the total rotation angle of the booster rod through each of the single rotation angles includes:

[0009] The third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center are obtained. The difference between the third angle and the fourth angle is used as the difference between the first angle and the second angle to obtain the rotation ratio. The single rotation angle of each actuator rocker arm is multiplied by the rotation ratio to obtain the single rotation angle of the booster rod. The absolute values ​​of the single rotation angles of each booster rod are summed to obtain the total rotation angle of the booster rod.

[0010] Furthermore, controlling the vehicle to travel a preset total mileage under preset road conditions and working conditions includes: causing the vehicle to travel a first mileage in mountainous road conditions, causing the vehicle to travel a second mileage in a variable working condition mode, causing the vehicle to travel a third mileage in a high-speed working condition mode, and causing the vehicle to travel a fourth mileage in severe road conditions, wherein the sum of the first mileage, the second mileage, the third mileage, and the fourth mileage is equal to the total mileage.

[0011] Furthermore, the ratio of the first mileage to the total mileage is between 0.18 and 0.21, the ratio of the second mileage to the total mileage is between 0.19 and 0.22, the ratio of the third mileage to the total mileage is between 0.49 and 0.54, and the ratio of the fourth mileage to the total mileage is between 0.08 and 0.12.

[0012] Furthermore, obtaining the total rotation angle of the booster rod from the single rotation angle of each actuator rocker arm includes: determining that the booster rod has performed a reverse movement when the signs of the single rotation angles of two adjacent actuator rocker arms are opposite, and recording the total number of reverse movements of the booster rod; determining a reverse cycle correction coefficient based on the total number of reverse movements, wherein the number of reverse cycle corrections is positively correlated with the total number of reverse movements; obtaining the basic total rotation angle of the booster rod based on the single rotation angle of the actuator rocker arm, and multiplying the basic total rotation angle by the reverse cycle correction coefficient to obtain the total rotation angle of the booster rod.

[0013] This invention also provides a life testing system for a vehicle turbocharger linkage, used to implement the life testing method for the turbocharger linkage described in the above embodiments. The life testing system includes: an acquisition module for acquiring a first rocker arm rotation angle of the actuator rocker arm; a processing module for obtaining the total rotation angle of the turbocharger linkage based on the first rocker arm rotation angle; and a determination module for determining that the life of the turbocharger linkage meets the requirements when the allowable total rotation angle of the turbocharger linkage is greater than the total rotation angle of the turbocharger linkage.

[0014] Furthermore, the acquisition module is also used to acquire a first angle and a corresponding first voltage when the actuator rocker arm is at the mechanical top dead center, and a second angle and a corresponding second voltage when the actuator rocker arm is at the mechanical bottom dead center; the processing module is also used to calculate a slope relationship based on the first angle and the first voltage, and the second angle and the second voltage, and construct a linear function of the rotation angle of the actuator rocker arm and the voltage through the slope relationship; the acquisition module is also used to acquire voltage from the voltage sensor at preset time intervals; the processing module is also used to obtain the rotation angle of the actuator rocker arm based on the linear function, and take the difference between the current rotation angle and the previous rotation angle as the single rotation angle of the actuator rocker arm; the processing module is also used to obtain the total rotation angle of the booster rod through the single rotation angles of each actuator rocker arm.

[0015] Furthermore, the acquisition module is also used to acquire the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; the processing module is also used to acquire the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center, and to obtain the angle ratio by taking the difference between the third angle and the fourth angle and taking the difference between the first angle and the second angle; the processing module is also used to accumulate the absolute values ​​of the single rotation angles of each actuator rocker arm to obtain the first total rocker arm rotation angle, and to multiply the first total rocker arm rotation angle by the angle ratio to obtain the total rotation angle of the booster rod.

[0016] This invention provides a method for testing the lifespan of a vehicle's turbocharger tie rod. One end of the turbocharger tie rod is connected to an actuator rocker arm, and the other end is connected to the turbocharger rocker arm. The lifespan testing method includes: controlling the vehicle to travel a preset total mileage under preset road conditions and preset operating conditions; obtaining a first rocker arm rotation angle of the actuator rocker arm, and obtaining the total rotation angle of the turbocharger tie rod based on the first rocker arm rotation angle; determining that the turbocharger tie rod meets the lifespan requirement when the allowable rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod. This can be understood as testing the lifespan of the turbocharger tie rod by subjecting the vehicle to different preset operating conditions and different preset... The test simulates the actual movement of the turbocharger tie rod during actual vehicle operation under road conditions. By comparing the actual total rotation angle of the turbocharger tie rod obtained from the test with the allowable total rotation angle of the turbocharger tie rod, it is determined whether the turbocharger tie rod can meet the life requirements, thus realizing the life test of the turbocharger tie rod. At the same time, by directly obtaining the first total rotation angle of the actuator rocker arm with a fixed rotation center axis and indirectly obtaining the rotation angle of the turbocharger tie rod through conversion, that is, by indirectly obtaining the total rotation angle of the turbocharger tie rod through the first rocker arm rotation angle of the actuator rocker arm, which is easier to obtain directly, the difficulty of obtaining the total rotation angle of the turbocharger tie rod is reduced. Attached Figure Description

[0017] Figure 1 A schematic flowchart illustrating a life testing method for a turbocharger tie rod provided in an embodiment of the present invention;

[0018] Figure 2 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention;

[0019] Figure 3 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention;

[0020] Figure 4 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention;

[0021] Figure 5 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention;

[0022] Figure 6 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a life testing system for a turbocharger tie rod provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this invention will not be described separately.

[0026] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0027] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. The term "connection," unless otherwise specified, includes both direct and indirect connections.

[0028] In the following specific embodiments, the life testing method for the turbocharger tie rod of a vehicle can be applied to any type of engine with an exhaust gas turbocharging system. For example, this life testing method can be applied to both gasoline and diesel engines. This life testing method can be applied to any engine-driven vehicle. For example, this life testing method can be applied to a passenger car with a direct-drive engine, and it can also be applied to a truck with a direct-drive engine. For ease of explanation, the following description uses a passenger car with a gasoline engine as an example to illustrate the steps of the turbocharger tie rod life testing method.

[0029] In some embodiments, one end of the booster rod is connected to the actuator rocker arm, and the other end of the booster rod is connected to the booster rocker arm. The actuator rocker arm is connected to the actuator and is used to rotate under the drive of the actuator. The booster rocker arm is used to rotate under the drive of the booster rod and drive the waste gas bypass valve to rotate. That is, the booster rod, the actuator rocker arm, and the booster rocker arm form a multi-link mechanism, and this multi-link structure can transmit the driving force of the actuator to the waste gas bypass valve. Figure 1 As shown, Figure 1 This is a flowchart illustrating a life testing method for a turbocharger tie rod according to an embodiment of the present invention. The steps of the life testing method include:

[0030] Step S101: Control the vehicle to travel a preset total mileage under preset road conditions and preset working conditions.

[0031] It should be noted that the vehicle's exhaust gas supercharging system engages differently depending on the road conditions and operating conditions, and the engine requires different intake air volumes. This necessitates that the exhaust gas bypass valve be at different opening degrees. By driving the vehicle under different preset road conditions and operating conditions, the opening changes of the exhaust gas bypass valve in typical application scenarios can be simulated, thereby simulating the movement of the supercharger lever.

[0032] Step S102: Obtain the first rocker arm rotation angle of the actuator rocker arm, and obtain the total rotation angle of the booster rod based on the first rocker arm rotation angle.

[0033] This can be understood as obtaining the rotation angle of the actuator rocker arm during vehicle movement, and then calculating the total rotation angle of the turbocharger lever through the motion relationship of the multi-link structure. It should be noted that the rotational motion of the actuator rocker arm is a rotation about a fixed rotation axis, while the motion of the turbocharger lever is a combination of rotation and translation in a plane. Therefore, the rotation center axis of the turbocharger lever is in a changing state, making it difficult to simply obtain the rotation angle through a sensor. Obtaining the rotation angle of the actuator rocker arm, which has a fixed rotation center axis, through a sensor, and then indirectly obtaining the total rotation angle of the turbocharger lever through the motion relationship, makes it more convenient to obtain the total rotation angle of the turbocharger lever.

[0034] Step S103: Under the condition that the allowable total rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod, determine that the service life of the turbocharger tie rod meets the requirements.

[0035] This can be understood as follows: based on the material and structure of the turbocharger, the allowable total rotation angle of the turbocharger tie rod can be obtained. If this allowable total rotation angle is greater than the actual total rotation angle obtained through steps S101 and S102, it can be determined that after the vehicle has traveled to a certain total mileage under different preset working conditions and different preset road conditions, the actual total rotation angle of the turbocharger tie rod has not exceeded the allowable total rotation angle of the turbocharger tie rod. Therefore, the turbocharger tie rod will not experience fatigue failure during actual use, and the lifespan of the turbocharger tie rod meets the requirements.

[0036] This invention provides a method for testing the lifespan of a vehicle's turbocharger tie rod. One end of the turbocharger tie rod is connected to an actuator rocker arm, and the other end is connected to the turbocharger rocker arm. The lifespan testing method includes: controlling the vehicle to travel a preset total mileage under preset road conditions and preset operating conditions; obtaining a first rocker arm rotation angle of the actuator rocker arm, and obtaining the total rotation angle of the turbocharger tie rod based on the first rocker arm rotation angle; determining that the turbocharger tie rod meets the lifespan requirement when the allowable rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod. This can be understood as testing the lifespan of the turbocharger tie rod by subjecting the vehicle to different preset operating conditions and different preset... The test simulates the actual movement of the turbocharger tie rod during actual vehicle operation under road conditions. By comparing the actual total rotation angle of the turbocharger tie rod obtained from the test with the allowable total rotation angle of the turbocharger tie rod, it is determined whether the turbocharger tie rod can meet the life requirements, thus realizing the life test of the turbocharger tie rod. At the same time, by directly obtaining the first total rotation angle of the actuator rocker arm with a fixed rotation center axis and indirectly obtaining the rotation angle of the turbocharger tie rod through conversion, that is, by indirectly obtaining the total rotation angle of the turbocharger tie rod through the first rocker arm rotation angle of the actuator rocker arm, which is easier to obtain directly, the difficulty of obtaining the total rotation angle of the turbocharger tie rod is reduced.

[0037] In some embodiments, the actuator rocker arm has a voltage sensor, that is, the rotation angle of the actuator rocker arm is obtained by the voltage of the voltage sensor, such as... Figure 2 As shown, Figure 2 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention is shown below. Figure 1 The difference between the life test methods shown is that... Figure 1 Step S102 includes:

[0038] Step S201: Obtain the first angle and the corresponding first voltage when the actuator rocker arm is at the mechanical top dead center, and the second angle and the corresponding second voltage when the actuator rocker arm is at the mechanical bottom dead center.

[0039] This can be understood as follows: when the actuator rocker arm is at the mechanical top dead center, the angle between the actuator rocker arm and the horizontal direction is recorded as the first angle. At the same time, the first voltage is obtained through a voltage sensor, thus obtaining the correspondence between the first set of actuator rocker arm angles and the horizontal direction and the voltage, that is, the correspondence between the first angle and the first voltage. When the actuator rocker arm is at the mechanical bottom dead center, the angle between the actuator rocker arm and the horizontal direction is recorded as the second angle. At the same time, the second voltage is obtained through a voltage sensor, thus obtaining the correspondence between the second set of actuator rocker arm angles and the horizontal direction and the voltage, that is, the correspondence between the second angle and the second voltage.

[0040] Step S202: Calculate the slope relationship based on the first angle and the first voltage, as well as the second angle and the second voltage, and construct a linear function of the rotation angle and voltage of the actuator rocker arm through the slope relationship.

[0041] This can be understood as the voltage of the voltage sensor changing linearly with the rotation angle of the actuator rocker arm; that is, the relationship between the voltage of the voltage sensor and the rotation angle of the actuator rocker arm is a linear function. Furthermore, the specific coefficients of this linear function can be obtained from the two sets of correspondences obtained in step S201. For example, let's consider the expression for this linear function as:

[0042] ω=KU+ω0

[0043] In the above formula, ω is the angle between the actuator rocker arm and the horizontal direction, U is the voltage obtained by the voltage sensor, K is the slope of the linear function, and ω0 is the constant term of the linear function. The first angle recorded in step S201 is denoted as ω. α Let the first voltage be denoted as U. α Let the second angle be ω. β The second voltage is denoted as U. β , the first angle ω α and the first voltage U α and the second angle ω β Second voltage U β Substituting these values ​​into the above equation yields the slope K and the constant term ω0 of the linear function. Specifically, the slope K can be calculated using the following formula:

[0044]

[0045] It should be noted that the subsequent steps do not require the angle between the actuator arm and the horizontal direction, but rather the rotation angle of the actuator arm. That is, the rotation angle is obtained by subtracting two adjacent angles. During the subtraction, the constant term ω0 of the linear function cancels out. Therefore, the linear function can be constructed after only calculating its slope, without needing to calculate the specific value of its constant term. Optionally, the second angle ω... β Second voltage U β Substituting the slope K calculated above into the expression of the linear function, we can obtain the magnitude of the constant term ω0 of the linear function, that is, ω0 = ω β -KU β .

[0046] Step S203: The voltage is obtained by the voltage sensor at preset intervals, and the rotation angle of the actuator rocker arm is obtained based on a linear function. The difference between the current rotation angle and the previous rotation angle is taken as the single rotation angle.

[0047] The rotation angle of the actuator rocker arm obtained by the linear function is the rotation angle relative to the horizontal direction, that is, the angle between it and the horizontal direction. It can be understood that the linear function constructed in step S202 converts the voltage value obtained by the voltage sensor into the angle between the actuator rocker arm and the horizontal direction at that moment. By subtracting the current rotation angle of the actuator rocker arm from the previous rotation angle, the angle of rotation of the actuator rocker arm within the preset time period can be obtained.

[0048] Step S204: Obtain the total rotation angle of the booster rod through each single rotation angle.

[0049] This can be understood as converting each single rotation angle into the total rotation angle of the booster rod. It should be noted that, after calculating the total rotation angle of the actuator rocker arm based on its rotation angle, the total rotation angle of the booster rod can be obtained from the total rotation angle of the actuator rocker arm. Alternatively, the single rotation angle of each actuator rocker arm can be converted into the single rotation angle of the booster rod, and then the total rotation angle of the booster rod can be obtained from the single rotation angle of the booster rod.

[0050] In some embodiments, such as Figure 3 As shown, Figure 3 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention is shown below. Figure 2 The test methods shown are different, Figure 2 Step S204 includes:

[0051] Step S301: Obtain the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center. Divide the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio.

[0052] Specifically, the angle between the intensifier rod and the horizontal direction when the actuator rocker arm is at the top dead center is the third angle, and the angle between the intensifier rod and the horizontal direction when the actuator rocker arm is at the bottom dead center is the fourth angle. The difference between the third and fourth angles is divided by the difference between the second and first angles to obtain the angle ratio. This can be understood as a linear relationship between the angle of the actuator rocker arm and the angle of the intensifier rod. The difference between the third and fourth angles is the maximum stroke of the intensifier rod, and the difference between the second and first angles is the maximum stroke of the actuator rocker arm. Dividing the maximum stroke of the intensifier rod by the maximum stroke of the actuator rocker arm yields the ratio of the angle of the intensifier rod to the angle of the actuator rocker arm. This ratio is recorded as the angle ratio, which converts the angle of the actuator rocker arm into the angle of the intensifier rod.

[0053] Step S302: The absolute values ​​of each single rotation angle are summed to obtain the total rotation angle of the first rocker arm. The total rotation angle of the first rocker arm is multiplied by the rotation angle ratio to obtain the total rotation angle of the turbocharger rod.

[0054] It can be understood that, it should be noted that different directions of rotation of the actuator rocker arm will result in different signs of the single rotation angle. In order to obtain the total rotation stroke of the actuator rocker arm, before accumulating each single rotation angle, it is necessary to take the absolute value of each single rotation angle. After obtaining the first total rotation angle of the actuator rocker arm, since the rotation angle ratio is a constant value, the first total rotation angle of the rocker arm can be directly multiplied by the rotation angle ratio to obtain the total rotation angle of the booster rod.

[0055] In some embodiments, such as Figure 4 As shown, Figure 4 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention is shown below. Figure 2 The difference between the life test methods shown is that... Figure 2 Step S204 includes:

[0056] Step S401: Obtain the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center. Divide the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio.

[0057] It should be noted that the specific execution steps of step S401 are the same as those of... Figure 3 Step S301 is exactly the same as the previous one, so it will not be repeated here.

[0058] Step S402: Multiply the single rotation angle of each actuator rocker arm by the rotation angle ratio to obtain the single rotation angle of the booster rod, and sum the absolute values ​​of the single rotation angles of each booster rod to obtain the total rotation angle of the booster rod.

[0059] This can be understood as follows: after converting the single rotation angle of each actuator rocker arm into the single rotation angle of the booster rod through the rotation angle ratio, the total rotation angle of the booster rod is obtained by summing the absolute values ​​of the single rotation angles of each booster rod.

[0060] In some embodiments, such as Figure 5 As shown, Figure 5 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention is shown below. Figure 1 The difference between the life test methods shown is that... Figure 1 Step S101 includes:

[0061] Step S501: Drive the vehicle for the first mile in mountainous road conditions, drive the vehicle for the second mile in variable working condition mode, drive the vehicle for the third mile in high working condition mode, and drive the vehicle for the fourth mile in severe road conditions.

[0062] The sum of the first, second, third, and fourth mileages equals the total mileage. This can be understood as simulating different common road and operating conditions by driving the vehicle for varying distances under different road and operating conditions until the total mileage is reached. This simulates the movement of the turbocharger linkage during actual vehicle operation. Specifically, the mountain road condition mode simulates driving in mountainous areas, mainly involving uphill, downhill, and mountain road driving. While ensuring safety, the vehicle is driven at a relatively high speed. There are no restrictions on the gear used uphill, but downhill driving should generally be done at a higher gear than uphill. The variable operating condition mode simulates driving in urban areas, traffic jams, and through traffic lights, involving a series of speed changes such as acceleration, deceleration, idling, and steady speed. The high-speed operating condition mode simulates driving on elevated roads and highways, with a maximum speed not exceeding 130 km / h and a minimum speed not lower than 80 km / h. The severe road condition mode simulates driving in slippery areas during rain or snow, and on gravel roads.

[0063] The ratio of the first mileage to the total mileage is between 0.18 and 0.21, the ratio of the second mileage to the total mileage is between 0.19 and 0.22, the ratio of the third mileage to the total mileage is between 0.49 and 0.54, and the ratio of the fourth mileage to the total mileage is between 0.08 and 0.12. This can be understood as the more common the operating conditions or road conditions the vehicle is in during actual operation, the larger the proportion of that operating condition or road condition to the total mileage. For example, the ratio of the first mileage to the total mileage is 0.2, the ratio of the second mileage to the total mileage is 0.2, the ratio of the third mileage to the total mileage is 0.5, and the ratio of the fourth mileage to the total mileage is 0.1. The total mileage is 300,000 kilometers, the first mileage is 60,000 kilometers, the second mileage is 60,000 kilometers, the third mileage is 150,000 kilometers, and the fourth mileage is 30,000 kilometers.

[0064] In some embodiments, such as Figure 6 As shown, Figure 6 A schematic flowchart of another life testing method for a turbocharger tie rod provided in an embodiment of the present invention is shown below. Figure 2 The difference between the life test methods shown is that... Figure 2 Step S204 includes:

[0065] Step S601: When the signs of the single rotation angles of the actuator rocker arm are opposite in two adjacent cycles, it is determined that the booster rod has performed a reverse motion, and the sum of the number of reverse motions of the booster rod is determined as the number of reverse motions.

[0066] This can be understood as follows: based on the different directions of the single rotation angle of the actuator rocker arm, the sign of the single rotation angle of the actuator rocker arm is different. Each preset time interval yields one single rotation angle of the actuator rocker arm. If the signs of the single rotation angles of the actuator rocker arm obtained in two adjacent intervals are different, it is considered that the actuator rocker arm has performed a reverse movement within this time range. The reverse movement of the actuator rocker arm will drive the booster rod to perform a reverse movement, so it can be further considered that the booster rod has performed a reverse movement. At the same time, by accumulating the number of reverse movements, the total number of reverse movements of the booster rod can be obtained.

[0067] Step S602: Determine the reverse cycle correction coefficient based on the total number of reverse motions.

[0068] The reverse cycle correction coefficient is positively correlated with the total number of reverse movements. This can be understood as the turbocharger tie rod undergoing one reverse cycle movement for each reverse movement. The reverse cycle movement has a greater impact on the lifespan of the turbocharger tie rod than the same-direction dynamic load. Therefore, the reverse cycle correction coefficient needs to be obtained by counting the number of reverse movements.

[0069] Step S603: Obtain the basic total rotation angle of the booster rod based on the single rotation angle of the actuator rocker arm, and multiply the basic total rotation angle by the reverse cycle correction coefficient to obtain the total rotation angle of the booster rod.

[0070] This can be understood as follows: The basic total rotation angle, which doesn't consider the number of reverse movements of the turbocharger tie rod, is obtained by measuring the single rotation angle of the actuator rocker arm. This basic total rotation angle is then multiplied by a reverse cycle correction coefficient. This corrected total rotation angle of the turbocharger tie rod is then obtained based on the total number of reverse movements, resulting in a more accurate reflection of the impact of the turbocharger tie rod's movement on its lifespan. The basic total rotation angle can be obtained through... Figure 3 The results obtained in steps S301 and S302 can also be obtained through... Figure 4 The results are obtained from steps S401 and S402.

[0071] This invention also provides a life testing system for a vehicle's turbocharger tie rod, which is used to achieve the following: Figures 1 to 6 The life test method for the turbocharger tie rod shown in any one of the pictures.

[0072] In some embodiments, such as Figure 7 As shown, the life testing system includes: an acquisition module 100 and a processing module 200. The acquisition module 100 acquires the first rocker arm rotation angle of the actuator rocker arm; the processing module 200 is used to obtain the total rotation angle of the turbocharger tie rod based on the first rocker arm rotation angle; the processing module 200 is also used to determine that the life of the turbocharger tie rod meets the requirements when the allowable total rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod. Optionally, the vehicle can travel a preset total mileage within preset road conditions and preset operating conditions by manual driving and recording the mileage. Optionally, if the vehicle has an automatic driving function, or if the testing system has an automatic operation device, the processing module 200 is also used to control the vehicle to travel a preset total mileage within the preset road conditions and preset operating conditions.

[0073] In some embodiments, such as Figure 7As shown, the acquisition module 100 is further configured to acquire a first angle and a corresponding first voltage when the actuator rocker arm is at the mechanical top dead center, and a second angle and a corresponding second voltage when the actuator rocker arm is at the mechanical bottom dead center. The processing module 200 is further configured to calculate a slope relationship based on the first angle and the first voltage, and the second angle and the second voltage, and construct a linear function of the actuator rocker arm's rotation angle and voltage through the slope relationship. The acquisition module 100 is further configured to acquire voltage from a voltage sensor at preset intervals, and the processing module 200 is further configured to obtain the rotation angle of the actuator rocker arm based on the linear function, and take the difference between the current rotation angle and the previous rotation angle as a single rotation angle. The processing module 200 is further configured to obtain the total rotation angle of the booster rod through each single rotation angle.

[0074] In some embodiments, such as Figure 7 As shown, the acquisition module 100 is further used to acquire the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; the processing module 200 is further used to divide the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio; the processing module 200 is further used to accumulate the absolute values ​​of each obtained single rotation angle to obtain the total rotation angle of the first rocker arm, and multiply the total rotation angle of the first rocker arm by the rotation angle ratio to obtain the total rotation angle of the booster rod.

[0075] In some embodiments, such as Figure 7 As shown, the acquisition module 100 is further used to acquire the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; the processing module 200 is further used to divide the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio; the processing module 200 is further used to multiply the single rotation angle of each actuator rocker arm by the rotation angle ratio to obtain the single rotation angle of the booster rod, and to sum the absolute values ​​of the single rotation angles of each booster rod to obtain the total rotation angle of the booster rod.

[0076] In some embodiments, such as Figure 7 As shown, the processing module 200 is further configured to determine that the booster rod has performed a reverse motion when the signs of the single rotation angles of two adjacent actuator rocker arms are opposite, and to determine the sum of the number of reverse motions of the booster rod as the number of reverse motions; the processing module 200 is further configured to determine the reverse cycle correction coefficient based on the total number of reverse motions; the processing module 200 is further configured to obtain the basic total rotation angle of the booster rod according to the single rotation angle of the actuator rocker arm, and to multiply the basic total rotation angle by the reverse cycle correction coefficient to obtain the total rotation angle of the booster rod.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A method for testing the lifespan of a vehicle's turbocharger tie rod, characterized in that, One end of the booster rod is connected to the actuator rocker arm, and the other end of the booster rod is connected to the booster rocker arm; the life test method includes: Control the vehicle to travel a preset total distance under preset road conditions and preset working conditions; The process involves obtaining a first rocker arm rotation angle of the actuator rocker arm and calculating the total rotation angle of the booster rod based on this first rocker arm rotation angle. The actuator rocker arm has a voltage sensor. Obtaining the first rocker arm rotation angle and calculating the total rotation angle of the booster rod includes: obtaining a first angle and a corresponding first voltage when the actuator rocker arm is at the mechanical top dead center, and a second angle and a corresponding second voltage when the actuator rocker arm is at the mechanical bottom dead center; calculating a slope relationship based on the first angle and first voltage, and the second angle and second voltage, and constructing a linear function between the rotation angle of the actuator rocker arm and the voltage using the slope relationship; obtaining voltage from the voltage sensor at preset intervals and calculating the rotation angle of the actuator rocker arm based on the linear function; and using the difference between the current rotation angle and the previous rotation angle as the single rotation angle of the actuator rocker arm. The total rotation angle of the booster lever is obtained by the single rotation angle of each actuator rocker arm; If the allowable total rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod, then the lifespan of the turbocharger tie rod is determined to meet the requirements. The step of obtaining the total rotation angle of the booster rod by the single rotation angle of each actuator rocker arm includes: obtaining the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; dividing the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio; summing the absolute values ​​of the single rotation angles of each actuator rocker arm to obtain the first rocker arm total rotation angle; and multiplying the first rocker arm total rotation angle by the rotation angle ratio to obtain the total rotation angle of the booster rod. Alternatively, obtaining the total rotation angle of the booster rod through the single rotation angle of each of the actuator rocker arms includes: obtaining a third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and a fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; dividing the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio; multiplying the single rotation angle of each of the actuator rocker arms by the rotation angle ratio to obtain the single rotation angle of the booster rod; and summing the absolute values ​​of the single rotation angles of each of the booster rods to obtain the total rotation angle of the booster rod.

2. The lifespan testing method according to claim 1, characterized in that, The control of the vehicle to travel a preset total mileage under preset road conditions and operating conditions includes: The vehicle travels a first mileage in mountainous road conditions, a second mileage in variable operating conditions, a third mileage in high-speed operating conditions, and a fourth mileage in severe road conditions, wherein the sum of the first mileage, the second mileage, the third mileage, and the fourth mileage equals the total mileage.

3. The lifespan testing method according to claim 2, characterized in that, The ratio of the first mileage to the total mileage is between 0.18 and 0.21, the ratio of the second mileage to the total mileage is between 0.19 and 0.22, the ratio of the third mileage to the total mileage is between 0.49 and 0.54, and the ratio of the fourth mileage to the total mileage is between 0.08 and 0.

12.

4. The lifespan testing method according to claim 1, characterized in that, The process of obtaining the total rotation angle of the booster lever through a single rotation angle of each actuator rocker arm includes: If the signs of the single rotation angles of the actuator rocker arm are opposite in two consecutive instances, it is determined that the booster lever has performed a reverse movement, and the total number of reverse movements of the booster lever is recorded. The reverse cycle correction coefficient is determined based on the total number of reverse movements, wherein the reverse cycle correction coefficient is positively correlated with the total number of reverse movements; The basic total rotation angle of the booster rod is obtained from the single rotation angle of the actuator rocker arm, and the basic total rotation angle is multiplied by the reverse cycle correction coefficient to obtain the total rotation angle of the booster rod.

5. A life testing system for a vehicle's turbocharger tie rod, characterized in that, The life testing system is used to implement the life testing method as described in any one of claims 1 to 4, and the life testing system comprises: The acquisition module is used to acquire the first rocker arm rotation angle of the actuator rocker arm; The processing module is used to obtain the total rotation angle of the booster rod based on the rotation angle of the first rocker arm; The determination module is used to determine whether the lifespan of the turbocharger tie rod meets the requirements when the allowable total rotation angle of the turbocharger tie rod is greater than the total rotation angle of the turbocharger tie rod.

6. The life testing system according to claim 5, characterized in that, The acquisition module is further configured to acquire a first angle and a corresponding first voltage when the actuator rocker arm is at the mechanical top dead center, and a second angle and a corresponding second voltage when the actuator rocker arm is at the mechanical bottom dead center; The processing module is further configured to calculate a slope relationship based on the first angle and the first voltage, and the second angle and the second voltage, and to construct a linear function of the rotation angle of the actuator rocker arm and the voltage through the slope relationship; The acquisition module is also used to acquire voltage from the voltage sensor at preset time intervals; The processing module is further configured to obtain the rotation angle of the actuator rocker arm based on the linear function, and take the difference between the current rotation angle and the previous rotation angle as the single rotation angle of the actuator rocker arm; The processing module is also used to obtain the total rotation angle of the booster lever through the single rotation angle of each actuator rocker arm.

7. The life testing system according to claim 5, characterized in that, The acquisition module is also used to acquire the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center; The processing module is further configured to obtain the third angle of the booster rod when the actuator rocker arm is at the mechanical top dead center, and the fourth angle of the booster rod when the actuator rocker arm is at the mechanical bottom dead center, and divide the difference between the third angle and the fourth angle by the difference between the first angle and the second angle to obtain the rotation angle ratio; The processing module is further configured to sum the absolute values ​​of the single rotation angles of each actuator rocker arm to obtain the total rotation angle of the first rocker arm, and multiply the total rotation angle of the first rocker arm by the rotation angle ratio to obtain the total rotation angle of the booster rod.

Images