Method and device for testing and analyzing knocking sensitivity of hybrid gearbox

Abstract

The invention provides a method for testing and analyzing the knocking sensitivity of a hybrid gearbox. The method comprises the following steps: acquiring dynamometer information data, determining an alternating torque range based on the dynamometer information data and a first angular acceleration fitting algorithm, and setting a constant torque test boundary; scanning point testing is carried out based on the constant torque testing boundary and the alternating torque range, and scanning point testing data are obtained; performing data post-processing based on the scanning point test data, obtaining a noise result and a knocking working condition marking result, and obtaining a current alternating torque when knocking occurs based on the knocking working condition marking result; acquiring a theoretical angular acceleration fluctuation value under the current alternating torque based on the scanning point test data and a second angular acceleration fitting algorithm; and forming a knocking sensitivity analysis table according to the scanning point test data, the theoretical angular acceleration fluctuation value, the noise result and the knocking working condition marking result so as to carry out sensitivity test analysis. The knock sensitivity test analysis method and device provided by the invention effectively improve the accuracy of knock sensitivity test analysis.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a hybrid transmission knock sensitivity testing and analysis method and device. Background Art

[0002] With the development of new energy technologies, hybrid powertrains are becoming more and more popular in passenger cars and commercial vehicles. Compared with traditional powertrains, in hybrid transmissions that include generators, the engine not only outputs torque, but also has the function of generating electricity. Knocking is a common problem of hybrid transmissions due to periodic fluctuations in engine output torque and gaps between transmission gears. However, the industry has only conducted knock sensitivity tests on traditional transmissions. This test relies on a test bench with a sinusoidal output function to simulate engine torque fluctuations. The dynamometer output shaft is connected to the transmission input. Data is obtained by setting up transient torque and speed tests on the dynamometer to analyze the knock level of the transmission at different speeds and torques in different gears.

[0003] The difficulty in testing the knock sensitivity of a hybrid transmission lies in the fact that the load of the generator will affect the knock performance of the entire transmission system. The variable of the generator load needs to be added during the test. The purpose is to present the relationship between the four quantities of engine, generator load, speed, input shaft angular acceleration and knock vibration noise. However, there is currently no knock sensitivity test method and analysis method suitable for hybrid transmissions in the industry. Summary of the invention

[0004] The present invention aims to provide a hybrid transmission knock sensitivity test and analysis method and device to solve the above-mentioned technical problems, effectively improve the accuracy of sensitivity test analysis, and provide an important reference basis for the development of related technical applications.

[0005] In order to solve the above technical problems, the present invention provides a hybrid transmission knock sensitivity test and analysis method, comprising the following steps:

[0006] Acquire dynamometer information data, determine an alternating torque range based on the dynamometer information data and a first angular acceleration fitting algorithm, and set a constant torque test boundary according to the alternating torque range;

[0007] Perform a sweep point test based on the constant torque test boundary and the alternating torque range to obtain sweep point test data;

[0008] Perform data post-processing based on the scan point test data to obtain the corresponding noise results and knocking condition marking results under different alternating torques, and obtain the current alternating torque when knocking occurs based on the knocking condition marking results;

[0009] The theoretical angular acceleration fluctuation value under the current alternating torque is obtained based on the scan point test data and the second angular acceleration fitting algorithm;

[0010] A knock sensitivity analysis table is formed based on the scan point test data, theoretical angular acceleration fluctuation value, noise results and knock condition marking results to perform knock sensitivity test analysis.

[0011] The present invention provides a hybrid transmission knock sensitivity test and analysis method, which simulates the knock condition in actual application by performing a sweeping point test, and uses a first angular acceleration fitting algorithm to calculate and set the test boundary range before test preparation, and uses a second angular acceleration fitting algorithm to calculate the theoretical angular acceleration value during result analysis, so as to replace the unstable and difficult to measure angular acceleration value that changes due to the knock condition during actual measurement, so as to make the theoretical acceleration fluctuation value more accurate and reliable, and also make the test and analysis results faster and more reliable, effectively improve the accuracy of sensitivity test analysis, and provide an important reference basis for the application development of related technologies.

[0012] Furthermore, dynamometer information data is obtained, and an alternating torque range is determined based on the dynamometer information data and a first angular acceleration fitting algorithm, so as to set a constant torque test boundary according to the alternating torque range, including: the dynamometer information data includes inertia information of each rotating part, an allowable torque upper limit, and an angular acceleration fluctuation upper limit value; based on the first angular acceleration fitting algorithm and the inertia information of each rotating part, and the angular acceleration fluctuation upper limit value, an alternating torque upper limit value is obtained; based on the alternating torque upper limit value, an alternating torque range is determined, so as to set a constant torque test boundary according to the alternating torque range, the allowable torque upper limit, and a preset torque rule.

[0013] The above scheme obtains the dynamometer information data and calculates and sets it by the preset first angular acceleration fitting algorithm, so as to obtain the alternating torque range and the constant torque test boundary, so that subsequent tests can be carried out within a safe range, providing a basis for the subsequent steps.

[0014] Further, based on the first angular acceleration fitting algorithm, the inertia information of each rotating part, and the angular acceleration fluctuation upper limit value, the alternating torque upper limit value is obtained, including: the first angular acceleration fitting algorithm includes a first inertia conversion algorithm, a first angular acceleration algorithm, and a first torque algorithm; the first inertia conversion algorithm is used to convert the inertia information of each rotating part to obtain the total inertia of the shaft gear, and the specific conversion process satisfies the following formula:

[0015]

[0016] J Sum =J 输入轴 +J 齿轮 +J 21

[0017] Where: J 21It indicates the input inertia of the conversion from axis 2 to axis 1, n1 indicates the speed of axis 1, n2 indicates the speed of axis 2, T1 indicates the number of teeth of axis 1, T2 indicates the number of teeth of axis 2, J2 indicates the moment of inertia of axis 2, J Sum Indicates the total inertia of the shaft and gear, J 输入轴 Indicates the input shaft inertia, J 齿轮 represents the gear inertia;

[0018] Acquiring an angular acceleration fluctuation value based on an angular acceleration fluctuation upper limit value and a first angular acceleration algorithm;

[0019] According to the first torque algorithm, the upper limit value of the alternating torque is obtained based on the total inertia of the shaft and teeth and the angular acceleration fluctuation value. The specific conversion process satisfies the following formula:

[0020]

[0021] Where: T dm Indicates the upper limit of alternating torque, J Sum represents the total inertia of the shaft and gear, Indicates the angular acceleration fluctuation value.

[0022] In the above scheme, the first angular acceleration fitting algorithm is used to calculate the boundary value, which provides a limit for the test data range for the scanning point test, thereby ensuring the rationality and safety of the method of the present invention.

[0023] Furthermore, a sweep point test is performed based on the constant torque test boundary and the alternating torque range to obtain sweep point test data, including: setting a fixed speed point and executing a sweep point test step: for any current constant torque, within the alternating torque range, setting the current alternating torque one by one according to a preset sampling method, so as to perform a test based on the current alternating torque until the preset torque coverage condition is met and the sampling data is obtained; for any fixed speed point, setting the current fixed speed point one by one according to the preset speed sampling method, executing the sweep point test step until the preset speed coverage condition is met and all the sampling data are obtained; and obtaining the sweep point test data based on all the sampling data.

[0024] The above scheme performs sweep point tests within the torque and speed range, covering all speed points as well as points of alternating torque and constant torque. The corresponding points can be selected for testing according to the preset sampling accuracy, and comprehensive sweep point test data can be obtained, providing a comprehensive and reliable data basis for subsequent data analysis and processing.

[0025] Furthermore, the preset coverage torque conditions include: when testing according to the preset sampling method, when it is determined based on the current sampling data that knocking occurs under the current alternating torque, the preset coverage conditions are met: or, when the alternating torque range is fully covered according to the preset sampling method, the preset coverage conditions are met.

[0026] In the above scheme, by setting a preset covering torque condition, when a knocking condition occurs, the same speed and constant torque, as well as the sweep point test under a larger alternating torque are no longer performed. By utilizing the principle that a larger alternating torque means a larger knocking, the number of unnecessary experiments can be reasonably reduced without affecting the final data acquisition, thereby avoiding waste of time, manpower and material resources and improving test efficiency.

[0027] Furthermore, the theoretical angular acceleration fluctuation value under the current alternating torque is obtained based on the sweeping point test data and the second angular acceleration fitting algorithm, including: the sweeping point test data contains the current inertia information of each rotating part under the current alternating torque; the second angular acceleration fitting algorithm includes a second inertia conversion algorithm, a second torque algorithm and a second angular acceleration algorithm; the second inertia conversion algorithm is used to convert the current inertia information of each rotating part to obtain the current total inertia of the shaft gear, and the specific conversion process satisfies the following formula:

[0028]

[0029] Where: Indicates the current input inertia of axis 2 converted to axis 1. Indicates the current speed of axis 1. Indicates the current speed of axis 2. Indicates the current moment of inertia of the 2 axes. Indicates the current total inertia of the shaft and gear. Indicates the current input shaft inertia, Indicates the current gear inertia;

[0030] Based on the current alternating torque, the current total inertia of the shaft and teeth, and the second torque algorithm, the theoretical angular acceleration fluctuation value under the current alternating torque is obtained. The specific calculation process satisfies the following formula:

[0031]

[0032] Where: T d Indicates the current alternating torque, Indicates the current total inertia of the shaft and gear. Indicates the current fluctuation angular acceleration value;

[0033] The theoretical angular acceleration fluctuation value is obtained based on the current fluctuation angular acceleration value and the second angular acceleration algorithm. The specific calculation process satisfies the following formula:

[0034]

[0035] Where: Indicates the theoretical angular acceleration fluctuation value.

[0036] The above scheme adopts the second angular acceleration fitting algorithm to convert the alternating torque when the knocking condition occurs into theoretical angular acceleration instead of the measured unstable angular acceleration according to the scanning point test data, providing faster and more reliable data support for the test and analysis results, and helping to improve the accuracy of sensitivity test analysis.

[0037] In the above scheme, the present invention provides a hybrid transmission knock sensitivity test and analysis method, which simulates the knock conditions in actual applications by performing a sweeping point test, and uses a first angular acceleration fitting algorithm to calculate and set the test boundary range before test preparation, and uses a second angular acceleration fitting algorithm to calculate the theoretical angular acceleration value during result analysis, so as to replace the unstable and difficult to measure angular acceleration value that changes due to the knocking condition during actual measurement, thereby making the test and analysis results faster and more reliable, effectively improving the accuracy of the sensitivity test analysis, providing a reference and basis for the target value setting in the early stage of hybrid transmission development and the later vehicle calibration, and accelerating the development process.

[0038] The present invention also provides a hybrid transmission knock sensitivity test and analysis device, which is used to implement a hybrid transmission knock sensitivity test and analysis method. The device includes a test bench and an analysis control center, wherein:

[0039] The test bench is used to build a hybrid transmission test bench to perform a sweep test according to the analysis and control center to obtain sweep test data, and the test bench contains dynamometer information data;

[0040] The analysis control center includes a test preparation unit, a scanning test unit, a data processing unit, a result processing unit and a test analysis unit, wherein:

[0041] The test preparation unit is used to obtain the dynamometer information data, and determine the alternating torque range based on the dynamometer information data and the first angular acceleration fitting algorithm, so as to set the constant torque test boundary of the test bench according to the alternating torque range;

[0042] The sweeping point test unit is used to control the experimental bench to perform a sweeping point test based on a constant torque test boundary and an alternating torque range, and obtain sweeping point test data;

[0043] The data processing unit is used to perform data post-processing based on the scan point test data, obtain the corresponding noise results and knocking condition marking results under different alternating torques, and obtain the current alternating torque when knocking occurs based on the knocking condition marking results;

[0044] The result processing unit is used to obtain a theoretical angular acceleration fluctuation value under the current alternating torque based on the sweep point test data and the second angular acceleration fitting algorithm;

[0045] The test analysis unit is used to form a knock sensitivity analysis table based on the scan point test data and the theoretical angular acceleration fluctuation value, noise results and knock condition marking results to perform knock sensitivity test analysis.

[0046] The above scheme provides a hybrid transmission knock sensitivity test and analysis device, which builds a hybrid transmission test bench, controls the test bench to perform a sweep point test within a range through an analysis control center, and uses an angular acceleration fitting algorithm to perform calculation and conversion through a result processing unit, thereby replacing the unstable and difficult-to-measure angular acceleration value that changes due to the knocking condition during actual measurement, so that the obtained theoretical acceleration fluctuation value is more accurate and reliable, thereby making the formed knock sensitivity analysis table more reliable, effectively improving the accuracy of the sensitivity test analysis, and providing an important reference basis for the application and development of related technologies.

[0047] Furthermore, the test preparation unit includes: a data acquisition subunit, used to acquire the dynamometer information data, the dynamometer information data including the inertia information of each rotating part, the allowable torque upper limit and the angular acceleration fluctuation upper limit; a data calculation subunit, used to acquire the alternating torque upper limit value based on the first angular acceleration fitting algorithm and the inertia information of each rotating part, and the angular acceleration fluctuation upper limit value; a boundary setting subunit, used to determine the alternating torque range based on the alternating torque upper limit value, so as to set the constant torque test boundary of the test bench according to the alternating torque range, the allowable torque upper limit and the preset torque rule.

[0048] In the above scheme, the test preparation unit works together with various sub-units to obtain the dynamometer information data and calculate and set it by the preset first angular acceleration fitting algorithm to obtain the alternating torque range and constant torque test boundary, so that subsequent tests can be carried out within a safe range, providing a basis for the operation of other parts of the device.

[0049] Furthermore, the sweeping point test unit includes: a torque test subunit, which is used to set a fixed speed point and control the test bench to perform a sweeping point test step: for any current constant torque, within the alternating torque range, the current alternating torque is set one by one according to a preset sampling method to control the test bench to perform a test based on the current alternating torque until the preset torque coverage condition is met and the sampling data is obtained; a speed test subunit, which, for any fixed speed point, sets the current fixed speed point one by one according to a preset speed sampling method to control the test bench to perform the sweeping point test step until the preset speed coverage condition is met and all the sampling data are obtained; a data acquisition subunit, which is used to obtain sweeping point test data based on all the sampling data.

[0050] The above scheme controls the test bench to perform sweeping point tests within the torque and speed range through the sweeping point test unit, covering all speed points and points of alternating torque and constant torque. The corresponding points can be selected for testing according to the preset sampling accuracy, and comprehensive sweeping point test data can be obtained, providing a comprehensive and reliable data basis for subsequent data analysis and processing of other units.

[0051] Furthermore, the analysis and control center also includes: a data acquisition unit for collecting information data of the dynamometer in the test bench and transmitting it to the test preparation unit, and collecting scanning point test data and feeding it back to the scanning point test unit.

[0052] The present invention provides a hybrid transmission knock sensitivity test and analysis device, which builds a hybrid transmission test bench to perform a sweep test through the control of the analysis control center to simulate the actual working condition; and before the test preparation, the first angular acceleration fitting algorithm is used to calculate and set the test boundary range, so as to set a safe test range for the sweep test and ensure the reliability of the test data; for all the obtained sweep test data, the result processing unit uses the angular acceleration fitting algorithm to calculate and convert, replacing the unstable and difficult to measure angular acceleration value that changes due to the knocking working condition during the actual measurement, so that the obtained theoretical acceleration fluctuation value is more accurate and reliable, thereby making the knock sensitivity analysis table formed by the test analysis unit more reliable. The device effectively improves the accuracy of sensitivity test analysis and provides an important reference basis for the application development of related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of a hybrid transmission knock sensitivity test and analysis method provided by an embodiment of the present invention;

[0054] Figure 2 A schematic diagram of inertia conversion between different axes provided by an embodiment of the present invention;

[0055] Figure 3 A schematic diagram of using a time domain 2D image to determine whether there is a knock is provided by an embodiment of the present invention;

[0056] Figure 4 A schematic diagram of using a 3D Colormap to determine a knock signal according to an embodiment of the present invention;

[0057] Figure 5 A schematic diagram of an application of a hybrid transmission knock sensitivity test and analysis method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Embodiment 1:

[0060] This embodiment provides a hybrid transmission knock sensitivity test and analysis method, comprising the following steps:

[0061] S11: acquiring dynamometer information data, and determining an alternating torque range based on the dynamometer information data and a first angular acceleration fitting algorithm, so as to set a constant torque test boundary according to the alternating torque range;

[0062] S12: performing a sweep point test based on a constant torque test boundary and an alternating torque range to obtain sweep point test data;

[0063] S13: performing data post-processing based on the scan point test data, obtaining the corresponding noise results and knocking condition marking results under different alternating torques, and obtaining the current alternating torque when knocking occurs based on the knocking condition marking results;

[0064] S14: obtaining a theoretical angular acceleration fluctuation value under the current alternating torque based on the scan point test data and the second angular acceleration fitting algorithm;

[0065] S15: A knock sensitivity analysis table is formed according to the scan point test data, the theoretical angular acceleration fluctuation value, the noise result and the knock condition marking result to perform a knock sensitivity test analysis.

[0066] This embodiment proposes a testing and analysis method suitable for the unique knock sensitivity of a hybrid transmission. A sweeping point test is performed to simulate the knock condition in actual application, and an angular acceleration fitting algorithm is used to calculate the theoretical angular acceleration value in the result analysis to replace the unstable and difficult to measure angular acceleration value that changes due to the knock condition during actual measurement. This makes the theoretical acceleration fluctuation value more accurate and reliable, and also makes the test and analysis results faster and more reliable, effectively improving the accuracy of sensitivity test analysis, and providing an important reference basis for the application development of related technologies.

[0067] Optionally, step S11 includes: the dynamometer information data includes the inertia information of each rotating part, the allowable torque upper limit and the angular acceleration fluctuation upper limit; based on the first angular acceleration fitting algorithm and the inertia information of each rotating part, the angular acceleration fluctuation upper limit, the alternating torque upper limit is obtained; based on the alternating torque upper limit, the alternating torque range is determined to set the constant torque test boundary according to the alternating torque range, the allowable torque upper limit and the preset torque rule.

[0068] In the specific implementation process, when using a dynamometer for testing, if the torque exceeds the torque limit of the dynamometer, the dynamometer will be damaged. Therefore, the test torque boundary needs to be defined before the experiment. The setting rule is that the sum of the constant torque and the alternating torque is less than the upper limit of the dynamometer's allowable torque. The constant torque is obtained by converting the torque and the speed ratio, and the alternating torque is obtained by calculating the torque principle. The relationship between the constant torque and the alternating torque is shown in the following formula:

[0069] T=T d +T m (2πft)

[0070] Where: T represents the output torque of the driving dynamometer; T d Represents the average component of the output torque of the driving dynamometer, that is, the constant torque; T m It represents the dynamic component of the output torque of the driving dynamometer, that is, the alternating torque; f represents the fluctuation frequency, and t represents the time.

[0071] Optionally, based on the first angular acceleration fitting algorithm, the inertia information of each rotating part, and the angular acceleration fluctuation upper limit value, the alternating torque upper limit value is obtained, including: the first angular acceleration fitting algorithm includes a first inertia conversion algorithm, a first angular acceleration algorithm, and a first torque algorithm; the first inertia conversion algorithm is used to convert the inertia information of each rotating part to obtain the total inertia of the shaft gear, and the specific conversion process satisfies the following formula:

[0072]

[0073] J Sum =J 输入轴 +J 齿轮 +J 21

[0074] Where: J 21 It indicates the input inertia of the conversion from axis 2 to axis 1, n1 indicates the speed of axis 1, n2 indicates the speed of axis 2, T1 indicates the number of teeth of axis 1, T2 indicates the number of teeth of axis 2, J2 indicates the moment of inertia of axis 2, J Sum Indicates the total inertia of the shaft and gear, J 输入轴 Indicates the input shaft inertia, J 齿轮 represents the gear inertia;

[0075] Acquiring an angular acceleration fluctuation value based on an angular acceleration fluctuation upper limit value and a first angular acceleration algorithm;

[0076] According to the first torque algorithm, the upper limit value of the alternating torque is obtained based on the total inertia of the shaft and teeth and the angular acceleration fluctuation value. The specific conversion process satisfies the following formula:

[0077]

[0078] Where: T dm Indicates the upper limit of alternating torque, J Sum represents the total inertia of the shaft and gear, Indicates the angular acceleration fluctuation value.

[0079] In the specific implementation process, the inertia conversion diagram between axis 1 and axis 2 is as follows Figure 2 As shown in the figure, J1 and J2 represent the inertia of axis 1 and axis 2 respectively; after calculating the total gear inertia, set the upper limit of the RMS value of the angular acceleration fluctuation of the input shaft speed. The upper limit RMS value of the angular acceleration fluctuation of a passenger car generally does not exceed 400 rad / s 2 , which is multiplied by The Peak-to-Peak value of the input shaft angular acceleration fluctuation is obtained, so as to calculate the upper limit value of the alternating torque based on the torque algorithm.

[0080] Optionally, step S12 includes: setting a fixed speed point and executing a sweeping point test step: for any current constant torque, within the alternating torque range, setting the current alternating torque one by one according to a preset sampling method, so as to perform a test based on the current alternating torque until the preset torque coverage condition is met and sampling data is obtained; for any fixed speed point, setting the current fixed speed point one by one according to a preset speed sampling method, executing the sweeping point test step until the preset speed coverage condition is met and all sampling data are obtained; and obtaining the sweeping point test data based on all sampling data.

[0081] In the specific implementation process, when performing the sweep test, the noise and vibration signals need to be monitored in real time to obtain the sampling data. The specific test steps are as follows: (1) Based on the set fixed speed point, first set a constant torque. When this constant torque remains unchanged, set the current alternating torque one by one according to the preset sampling method. For example, the alternating torque amplitude is set from 0Nm, the sampling interval is 5Nm, and the converted angular acceleration fluctuation sampling interval is about 20rad / s 2, then start the test from the alternating torque equal to 0Nm, and only change the value of the alternating torque each time, that is, increase it by 5Nm, until the preset torque coverage condition is reached, stop the test, and obtain the sampling data of each alternating torque test point; (2) after the preset torque coverage condition is met, still based on the fixed speed point set in step (1), first set a new constant torque, and when this new constant torque remains unchanged, set the current alternating torque one by one according to the preset sampling method, for example, the alternating torque amplitude is set from 0Nm, the sampling interval is 5Nm, and the converted angular acceleration fluctuation sampling interval is about 20rad / s 2 , then start the test from the alternating torque equal to 0Nm, and only change the value of the alternating torque each time, that is, increase it by 5Nm, until the preset torque coverage condition is reached, stop the test, and obtain the sampling data of each alternating torque test point. (3) Repeat step (2) until all constant torque test points are covered. The setting of constant torque uses the generator torque as the reference, which is obtained by speed ratio conversion. The maximum generating torque is determined according to the actual calibration strategy. In the process of setting the new constant torque test point, the constant torque starts from 0Nm. The smaller the torque, the smaller the sampling interval; the sampling interval can be 2.5Nm when 0-10Nm, and 1.5Nm small torque points can be added at the same time; the sampling interval is 5Nm when 10-20Nm. According to actual needs, more precise scanning can be performed, but at the same time, the test time and data volume will also increase exponentially. (4) Set the sampling interval according to the actual situation, set new fixed speed points in the range in turn, and repeat steps (1) to (3) based on the new fixed speed points until all speed points are covered and all sampling data are obtained, so as to obtain the scanning point test data based on all sampling data.

[0082] Optionally, the preset coverage torque condition includes: when testing according to the preset sampling method, when it is determined based on the current sampling data that knocking occurs under the current alternating torque, the preset coverage condition is met; or, when the alternating torque range is fully covered according to the preset sampling method, the preset coverage condition is met.

[0083] In the specific implementation process, when performing the sweep test, it is assumed that the sampling time for each working condition is 10s. During the test, it is necessary to monitor the noise and vibration signals in real time and obtain the sampling data. At a certain fixed speed point and fixed constant torque, as the alternating torque gradually increases, the risk of knocking also gradually increases. When the knocking is first found based on the sampling data, record it for 10s, and then stop increasing the fluctuating torque and jump directly to the next constant torque for testing to prevent excessive fluctuations from damaging the dynamometer.

[0084] Optionally, step S14 includes: the scanning point test data contains the current inertia information of each rotating part under the current alternating torque; the second angular acceleration fitting algorithm includes a second inertia conversion algorithm, a second torque algorithm and a second angular acceleration algorithm; the second inertia conversion algorithm is used to convert the current inertia information of each rotating part to obtain the current total inertia of the shaft gear, and the specific conversion process satisfies the following formula:

[0085]

[0086] Where: Indicates the current input inertia of axis 2 converted to axis 1. Indicates the current speed of axis 1. Indicates the current speed of axis 2. Indicates the current moment of inertia of the 2 axes. Indicates the current total inertia of the shaft and gear. Indicates the current input shaft inertia, Indicates the current gear inertia;

[0087] Based on the current alternating torque, the current total inertia of the shaft and teeth, and the second torque algorithm, the theoretical angular acceleration fluctuation value under the current alternating torque is obtained. The specific calculation process satisfies the following formula:

[0088]

[0089] Where: T d Indicates the current alternating torque, Indicates the current total inertia of the shaft and gear. Indicates the current fluctuation angular acceleration value;

[0090] The theoretical angular acceleration fluctuation value is obtained based on the current fluctuation angular acceleration value and the second angular acceleration algorithm. The specific calculation process satisfies the following formula:

[0091]

[0092] Where: Indicates the theoretical angular acceleration fluctuation value.

[0093] In the specific implementation process, the measured angular acceleration value is unstable under the same fluctuating torque, and the angular acceleration fluctuation will increase sharply when knocking occurs. The fluctuating angular acceleration makes it impossible to organize the test data and form an analysis result for reference. Therefore, the second angular acceleration fitting algorithm is used to convert the alternating torque into theoretical angular acceleration instead of the measured unstable angular acceleration to calculate the theoretical angular acceleration fluctuation value.

[0094] In the above scheme, the present invention provides a hybrid transmission knock sensitivity test and analysis method, which simulates the knock conditions in actual applications by performing a sweeping point test, and uses a first angular acceleration fitting algorithm to calculate and set the test boundary range before test preparation, and uses a second angular acceleration fitting algorithm to calculate the theoretical angular acceleration value during result analysis, so as to replace the unstable and difficult to measure angular acceleration value that changes due to the knocking condition during actual measurement, so as to make the theoretical acceleration fluctuation value more accurate and reliable, and also make the test and analysis results faster and more reliable, effectively improving the accuracy of sensitivity test analysis, and providing an important reference basis for the application development of related technologies.

[0095] Embodiment 2:

[0096] This embodiment provides a hybrid transmission knock sensitivity test and analysis device, which is used to implement a hybrid transmission knock sensitivity test and analysis method. The device includes a test bench and an analysis control center, wherein:

[0097] The test bench is used to build a hybrid transmission test bench to perform a sweep test according to the analysis and control center to obtain sweep test data, and the test bench contains dynamometer information data;

[0098] The analysis control center includes a test preparation unit, a scanning test unit, a data processing unit, a result processing unit and a test analysis unit, wherein:

[0099] The test preparation unit is used to obtain the dynamometer information data, and determine the alternating torque range based on the dynamometer information data and the first angular acceleration fitting algorithm, so as to set the constant torque test boundary of the test bench according to the alternating torque range;

[0100] The sweeping point test unit is used to control the experimental bench to perform a sweeping point test based on a constant torque test boundary and an alternating torque range, and obtain sweeping point test data;

[0101] The data processing unit is used to perform data post-processing based on the scan point test data, obtain the corresponding noise results and knocking condition marking results under different alternating torques, and obtain the current alternating torque when knocking occurs based on the knocking condition marking results;

[0102] The result processing unit is used to obtain a theoretical angular acceleration fluctuation value under the current alternating torque based on the sweep point test data and the second angular acceleration fitting algorithm;

[0103] The test analysis unit is used to form a knock sensitivity analysis table based on the scan point test data and the theoretical angular acceleration fluctuation value, noise results and knock condition marking results to perform knock sensitivity test analysis.

[0104] The above scheme provides a hybrid transmission knock sensitivity test and analysis device, which builds a hybrid transmission test bench, controls the test bench to perform a sweep point test within a range through an analysis control center, and uses an angular acceleration fitting algorithm to perform calculation and conversion through a result processing unit, thereby replacing the unstable and difficult-to-measure angular acceleration value that changes due to the knocking condition during actual measurement, so that the obtained theoretical acceleration fluctuation value is more accurate and reliable, thereby making the formed knock sensitivity analysis table more reliable, effectively improving the accuracy of the sensitivity test analysis, and providing an important reference basis for the application and development of related technologies.

[0105] In the specific implementation process, when building the hybrid transmission test bench, the test part is the hybrid transmission. The dynamometer and the hybrid transmission input shaft are splined and the shock absorber cannot be installed. The test is carried out in a semi-anechoic chamber of the powertrain with a cutoff frequency of 50Hz. The drive dynamometer has a high-speed sine wave generator function (HSSWG), which can simulate engine torque fluctuations at different amplitudes and different excitation frequencies.

[0106] Optionally, the test preparation unit includes: a data acquisition subunit, used to acquire the dynamometer information data, the dynamometer information data including the inertia information of each rotating part, the allowable torque upper limit and the angular acceleration fluctuation upper limit; a data calculation subunit, used to acquire the alternating torque upper limit value based on the first angular acceleration fitting algorithm and the inertia information of each rotating part, and the angular acceleration fluctuation upper limit value; a boundary setting subunit, used to determine the alternating torque range based on the alternating torque upper limit value, so as to set the constant torque test boundary of the test bench according to the alternating torque range, the allowable torque upper limit and the preset torque rule.

[0107] Optionally, the sweeping point test unit includes: a torque test subunit, which is used to set fixed speed points and control the test bench to perform sweeping point test steps: for any current constant torque, within the alternating torque range, the current alternating torque is set one by one according to a preset sampling method, so as to control the test bench to perform tests based on the current alternating torque until the preset torque coverage condition is met and the sampling data is obtained; a speed test subunit, which, for any fixed speed point, sets the current fixed speed point one by one according to a preset speed sampling method, controls the test bench to perform the sweeping point test steps, until the preset speed coverage condition is met and all the sampling data are obtained; a data acquisition subunit, which is used to obtain sweeping point test data based on all the sampling data.

[0108] In the specific implementation process, the raw data analysis and post-processing analysis are performed on the scanning point test data to obtain the corresponding noise results and knocking condition marking results under different alternating torques. The occurrence of knocking signals can be judged by two methods: time domain data playback and 2D and 3D graphs to judge and mark the knocking condition points: (1) subjectively evaluate whether knocking occurs by raw data playback. The data playback measurement point preferably selects the microphone or vibration acceleration sensor corresponding to the larger surface of the shell to make the vibration signal more obvious. The knocking condition is marked after subjective evaluation; (2) Determine knocking through time domain 2D graphs or 3D Colormap graphs, such as Figure 3 As shown in the figure, when the time domain signal has a significantly larger fluctuation peak, it can be determined that a knock has occurred, such as Figure 4 As shown, when an obvious broadband signal appears in the Colormap, it can be determined that a knock signal has occurred.

[0109] Optionally, the analysis and control center also includes: a data acquisition unit, which is used to collect information data of the dynamometer in the test bench and transmit it to the test preparation unit, and to collect scanning point test data and feed it back to the scanning point test unit.

[0110] In the specific implementation process, the data acquisition unit is equipped with vibration acceleration sensors, noise microphones, speed magnetoelectric probes, etc., and connected to the CAN line to collect control data. The vibration acceleration sensor is used to collect angular acceleration and vibration signals, the noise microphone is used to detect noise results, and the speed magnetoelectric probe is used to detect the speed. Before the test, the magnetoelectric probe installation hole needs to be processed on the shell of the hybrid transmission test bench. It is recommended to punch a hole for each gear. When the magnetoelectric probe is installed, its direction needs to point to the center of the gear. The distance between the magnetoelectric probe and the tooth top needs to be adjusted according to the sensor parameters, and 2 to 3 mm is recommended; the microphone measurement point is located 5 cm near the gear bearing seat and the larger thin-walled radiation surface of the hybrid transmission shell; the vibration sensor is located on the shell surface pointed by each microphone; the CAN line reads data including at least engine torque, engine speed, generator torque, generator speed, drive motor torque and drive motor speed.

[0111] The present embodiment provides a hybrid transmission knock sensitivity test and analysis device, which builds a hybrid transmission test bench to perform a sweep test through the analysis control center to simulate the actual working condition; and before the test preparation, the first angular acceleration fitting algorithm is used to calculate and set the test boundary range, so as to set a safe test range for the sweep test and ensure the reliability of the test data; for all the obtained sweep test data, the result processing unit uses the angular acceleration fitting algorithm to calculate and convert, replacing the unstable and difficult to measure angular acceleration value that changes due to the knocking working condition during the actual measurement, so that the obtained theoretical acceleration fluctuation value is more accurate and reliable, thereby making the knock sensitivity analysis table formed by the test analysis unit more reliable. The device effectively improves the accuracy of the sensitivity test analysis and solves the problem of insufficient knock analysis in the development of existing hybrid transmissions.

[0112] Embodiment three:

[0113] This embodiment provides an application of a hybrid transmission knock sensitivity test and analysis method, such as Figure 5 As shown, the following steps are included:

[0114] S31: Build a hybrid transmission test bench;

[0115] S32: Arrange the collector and connect the data line to control the experimental bench and collect data;

[0116] S33: acquiring dynamometer information data, and determining an alternating torque range based on the dynamometer information data and a first angular acceleration fitting algorithm, so as to set a constant torque test boundary according to the alternating torque range;

[0117] S34: performing a sweep point test of an idle charging condition based on a constant torque test boundary and an alternating torque range, and obtaining sweep point test data;

[0118] S35: performing data post-processing based on the scan point test data, obtaining the corresponding noise results and knocking condition marking results under different alternating torques, and obtaining the current alternating torque when knocking occurs based on the knocking condition marking results;

[0119] S36: Based on the sweep test data and the second angular acceleration fitting algorithm, the theoretical angular acceleration fluctuation value under the current alternating torque is obtained, and the noise result and the knock condition marking result are combined to form a hybrid transmission knock sensitivity analysis table for performing knock sensitivity test analysis.

[0120] Optionally, in step S31, the test bench includes a dynamometer and a hybrid transmission, and a spline connection is adopted between the dynamometer and the input shaft of the hybrid transmission.

[0121] In the specific implementation process, in step S32, the collector includes a vibration acceleration sensor, a noise microphone, and a speed magnetoelectric probe, etc., and the CAN line is connected to collect control data. The vibration acceleration sensor is used to collect angular acceleration and vibration signals, the noise microphone is used to detect noise results, and the speed magnetoelectric probe is used to detect the speed. Before the test, the magnetoelectric probe installation hole needs to be processed on the shell of the hybrid transmission test bench. It is recommended that each gear is punched. When the magnetoelectric probe is installed, its direction needs to point to the center of the gear. The distance between the magnetoelectric probe and the tooth top needs to be adjusted according to the sensor parameters, and 2 to 3 mm is recommended; the microphone measurement point is located 5 cm near the gear bearing seat and the larger thin-walled radiation surface of the hybrid transmission shell; the vibration sensor is located on the shell surface pointed to by each microphone; the CAN line reads data including at least engine torque, engine speed, generator torque, generator speed, drive motor torque and drive motor speed.

[0122] Optionally, in step S35, the scanning point test data is played back through time domain data and 2D and 3D graphs to determine and mark the knocking condition points to obtain noise results and knocking condition marking results.

[0123] Optionally, in step S36, the theoretical angular acceleration fluctuation value under the current alternating torque is obtained instead of the measured value to perform knock sensitivity analysis. Under the same alternating torque, the measured angular acceleration fluctuation value is unstable, and when knocking occurs, the angular acceleration fluctuation increases sharply. The fluctuating angular acceleration makes it impossible to organize the test data and form an analysis result for reference. As shown in Table 1, it can be concluded through the numerical analysis of the shaded part that under the same fluctuating torque, the angular acceleration fluctuation value is unstable:

[0124] Table 1 Analysis of measured angular acceleration fluctuation values

[0125]

[0126] Optionally, in step S36, the noise sound pressure level (noise result) measured at the same speed is filled into the table based on the scan point test data, and the working condition where the knocking occurs is filled with a shadow (knocking working condition mark result). A larger alternating torque means a larger knocking. After the knocking occurs during the test, the alternating torque will no longer increase, so the working condition points that have not been collected are filled with " / ". This analysis method is used for each steady-state speed point tested, that is, the knocking sensitivity Map (analysis table) of all speed points is obtained: the horizontal axis in the table has two rows, the first row is the dynamometer alternating torque amplitude, and the second row is the transmission input shaft angular acceleration obtained after conversion. In practical applications, the first row can be ignored and the second row can be directly used; the vertical axis in the table has three columns, the first column is the generator torque, the second column is the dynamometer constant torque after speed ratio conversion, that is, the engine torque, and the third column is the power generation; in practical applications, different display parameters can be selected according to different focus points; the value in the middle of the table is the noise sound pressure level of different working conditions; the shaded part is the working condition point where the knocking occurs. For example, when the speed point is 1300rpm, the knock sensitivity analysis map results are shown in the following table:

[0127] Table 2 Analysis of knock sensitivity at a speed point of 1300 rpm

[0128]

[0129] In the specific implementation process, the application of a hybrid transmission knock sensitivity test and analysis method provided in this embodiment solves the problem of insufficient knock analysis in the development of existing hybrid transmissions: it can be applied to the early stage of the development project, according to the power generation conditions set in the conceptual stage, to select the vibration reduction target to be achieved, for example, if the P1 motor 5NM torque is selected, the 2nd order angular acceleration of the hybrid transmission input shaft in this condition needs to be controlled to ≤61rad / s2; it can also be applied to the later calibration stage of the project, for example, if knocking occurs at the selected idle power generation condition point, other torques can be selected according to the chart, and the optimal noise area can also be selected according to the chart. This application method provides a practical experimental development and analysis solution for the common knocking problems in the development of hybrid transmissions, and provides an important reference basis for the early NVH development and later NVH calibration of hybrid assemblies.

[0130] The application of a hybrid transmission knock sensitivity test and analysis method provided in this embodiment solves the shortcomings of knock analysis in the development of existing hybrid transmissions. Through experimental data analysis, a hybrid transmission knock state distribution map of different operating points under idle charging mode is obtained, which provides a reference and basis for the target value setting in the early stage of hybrid transmission development and the later vehicle calibration, thereby accelerating the development process.

[0131] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A hybrid transmission knock sensitivity test and analysis method, characterized in that: The following steps are involved: Acquire dynamometer information data, determine an alternating torque range based on the dynamometer information data and a first angular acceleration fitting algorithm, and set a constant torque test boundary according to the alternating torque range; Perform a sweep point test based on the constant torque test boundary and the alternating torque range to obtain sweep point test data; Based on the sweep test data, the corresponding noise results and knocking condition marking results under different alternating torques are obtained, and based on the knocking condition marking results, the current alternating torque when knocking occurs is obtained; The theoretical angular acceleration fluctuation value under the current alternating torque is obtained based on the scan point test data and the second angular acceleration fitting algorithm; A knock sensitivity analysis table is formed based on the scan point test data, theoretical angular acceleration fluctuation value, noise results and knock condition marking results to perform knock sensitivity test analysis.

2. According to the hybrid transmission knock sensitivity test and analysis method of claim 1, the step of acquiring dynamometer information data, determining an alternating torque range based on the dynamometer information data and a first angular acceleration fitting algorithm, and setting a constant torque test boundary according to the alternating torque range comprises: The dynamometer information data includes the inertia information of each rotating part, the upper limit of the allowable torque and the upper limit of the angular acceleration fluctuation; Based on the first angular acceleration fitting algorithm, the inertia information of each rotating part, and the upper limit value of the angular acceleration fluctuation, the upper limit value of the alternating torque is obtained; An alternating torque range is determined based on the alternating torque upper limit value, so as to set a constant torque test boundary according to the alternating torque range, the allowable torque upper limit and a preset torque rule.

3. According to the hybrid transmission knock sensitivity test and analysis method of claim 2, the step of obtaining the alternating torque upper limit value based on the first angular acceleration fitting algorithm, the inertia information of each rotating part, and the angular acceleration fluctuation upper limit value comprises: The first angular acceleration fitting algorithm includes a first inertia conversion algorithm, a first angular acceleration algorithm and a first torque algorithm; The first inertia conversion algorithm is used to convert the inertia information of each rotating part to obtain the total inertia of the shaft and gear. The specific conversion process satisfies the following formula: I Sum =J 输入轴 +J 齿轮 +J 21 Where: J 21 It indicates the input inertia of the conversion from axis 2 to axis 1, n1 indicates the speed of axis 1, n2 indicates the speed of axis 2, T1 indicates the number of teeth of axis 1, T2 indicates the number of teeth of axis 2, J2 indicates the moment of inertia of axis 2, J Sum Indicates the total inertia of the shaft and gear, J 输入轴 Indicates the input shaft inertia, J 齿轮 represents the gear inertia; Acquiring an angular acceleration fluctuation value based on an angular acceleration fluctuation upper limit value and a first angular acceleration algorithm; According to the first torque algorithm, the upper limit value of the alternating torque is obtained based on the total inertia of the shaft and the angular acceleration fluctuation value. The specific conversion process satisfies the following formula: Where: T dm Indicates the upper limit of alternating torque, J Sum represents the total inertia of the shaft and gear, Indicates the angular acceleration fluctuation value.

4. A hybrid transmission knock sensitivity test and analysis method according to claim 1, characterized in that: The point sweeping test is performed based on the constant torque test boundary and the alternating torque range to obtain the point sweeping test data, including: Set a fixed speed point and perform a sweep point test step: for any current constant torque, within the alternating torque range, set the current alternating torque one by one according to a preset sampling method, so as to perform a test based on the current alternating torque until the preset torque coverage condition is met and the sampling data is obtained; For any fixed speed point, the current fixed speed points are set one by one according to the preset speed sampling method, and the scanning point test step is performed until the preset speed coverage condition is met to obtain all sampling data; The scan point test data is obtained based on all the sampling data.

5. A hybrid transmission knock sensitivity test and analysis method according to claim 4, characterized in that: The preset covering torque conditions include: When testing according to the preset sampling method, when it is determined based on the current sampling data that a knocking condition occurs under the current alternating torque, the preset coverage condition is met; Or, when the alternating torque range is fully covered according to the preset sampling method, the preset coverage condition is met.

6. A hybrid transmission knock sensitivity test and analysis method according to claim 1, characterized in that: The method of obtaining the theoretical angular acceleration fluctuation value under the current alternating torque based on the scan point test data and the second angular acceleration fitting algorithm includes: The scanning point test data contains the current inertia information of each rotating part under the current alternating torque; The second angular acceleration fitting algorithm includes a second inertia conversion algorithm, a second torque algorithm and a second angular acceleration algorithm; The second inertia conversion algorithm is used to convert the current inertia information of each rotating part to obtain the current total inertia of the shaft gear. The specific conversion process satisfies the following formula: Where: Indicates the current input inertia of axis 2 converted to axis 1. Indicates the current speed of axis 1. Indicates the current speed of axis 2. Indicates the current moment of inertia of the 2 axes. Indicates the current total inertia of the shaft and gear. Indicates the current input shaft inertia, Indicates the current gear inertia; Based on the current alternating torque, the current total inertia of the shaft and teeth, and the second torque algorithm, the theoretical angular acceleration fluctuation value under the current alternating torque is obtained. The specific calculation process satisfies the following formula: Where: T d Indicates the current alternating torque, Indicates the current total inertia of the shaft and gear. Indicates the current fluctuation angular acceleration value; The theoretical angular acceleration fluctuation value is obtained based on the current fluctuation angular acceleration value and the second angular acceleration algorithm. The specific calculation process satisfies the following formula: Where: Indicates the theoretical angular acceleration fluctuation value.

7. A hybrid transmission knock sensitivity test and analysis device, characterized in that: A method for testing and analyzing the knock sensitivity of a hybrid transmission according to any one of claims 1 to 6 is provided, comprising a test bench and an analysis control center, wherein: The test bench is used to build a hybrid transmission test bench to perform a sweep test according to the analysis and control center to obtain sweep test data, and the test bench contains dynamometer information data; The analysis control center includes a test preparation unit, a scanning test unit, a data processing unit, a result processing unit and a test analysis unit, wherein: The test preparation unit is used to obtain the dynamometer information data, and determine the alternating torque range based on the dynamometer information data and the first angular acceleration fitting algorithm, so as to set the constant torque test boundary of the test bench according to the alternating torque range; The sweeping point test unit is used to control the experimental bench to perform a sweeping point test based on a constant torque test boundary and an alternating torque range, and obtain sweeping point test data; The data processing unit is used to perform data post-processing based on the sweep point test data, obtain the corresponding noise results and knocking condition marking results under different alternating torques, and obtain the current alternating torque when knocking occurs based on the knocking condition marking results; The result processing unit is used to obtain a theoretical angular acceleration fluctuation value under the current alternating torque based on the sweep point test data and the second angular acceleration fitting algorithm; The test analysis unit is used to form a knock sensitivity analysis table based on the scan point test data and the theoretical angular acceleration fluctuation value, noise results and knock condition marking results to perform knock sensitivity test analysis.

8. A hybrid transmission knock sensitivity test and analysis device according to claim 7, characterized in that: The test preparation unit comprises: A data acquisition subunit, used to acquire the dynamometer information data, wherein the dynamometer information data includes the inertia information of each rotating part, the upper limit of the allowable torque and the upper limit of the angular acceleration fluctuation; A data calculation subunit, used for obtaining an upper limit value of the alternating torque based on a first angular acceleration fitting algorithm, inertia information of each rotating part, and an upper limit value of angular acceleration fluctuation; The boundary setting subunit is used to determine the alternating torque range based on the alternating torque upper limit value, so as to set the constant torque test boundary of the test bench according to the alternating torque range, the allowable torque upper limit and the preset torque rule.

9. A hybrid transmission knock sensitivity test and analysis device according to claim 7, characterized in that: The scanning point test unit comprises: The torque test subunit is used to set a fixed speed point and control the test bench to perform a sweep test step: for any current constant torque, within the alternating torque range, the current alternating torque is set one by one according to the preset sampling method to control the test bench to perform a test based on the current alternating torque until the preset torque coverage condition is met and the sampling data is obtained; The speed test subunit sets the current fixed speed points one by one according to the preset speed sampling method for any fixed speed point, controls the test bench to execute the scanning point test steps, and obtains all sampling data until the preset speed coverage condition is met; The data acquisition subunit is used to obtain scanning point test data based on all sampling data.

10. The hybrid transmission knock sensitivity test and analysis device according to claim 7, characterized in that: The analysis and control center also includes: a data acquisition unit, which is used to collect information data of the dynamometer in the test bench and transmit it to the test preparation unit, and to collect scanning point test data and feed it back to the scanning point test unit.

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