A method for testing engine acceleration noise of a series hybrid vehicle

Abstract

The present application belongs to the field of automobile technology, and in particular to a method for testing engine acceleration noise of a series hybrid vehicle. The method comprises the following steps: step one, determining the engine operating curve; step two, selecting the use preparation; step three, setting different vehicle speeds, and testing the engine acceleration noise for each vehicle speed; step four, collecting engine noise data obtained from the engine acceleration noise test, and processing the data; step five, synthesizing the data processed in step four; and step six, drawing the engine acceleration noise curve. The present application proposes a method for tracking the noise curve of engine power and ultimately obtaining the engine acceleration noise in series mode. The results obtained are more accurate, the method is simpler, and the problem of inaccurate engine acceleration noise results and complex test methods using traditional methods is solved.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically a method for testing the acceleration noise of a series hybrid vehicle engine. Background Technology

[0002] With the development of the automotive industry, major automakers are producing an increasing number of electrified and hybrid models, resulting in growing sales. Among these, major automakers are developing hybrid vehicles primarily based on a dual-motor series-parallel configuration. This type of hybrid vehicle not only boasts good fuel economy and excellent power performance but has also received widespread market acclaim. Extended-range electric vehicles, represented by Li Auto, are another example of series hybrids. However, in series hybrid models, the engine only drives the generator to provide electrical energy. There is no actual gear relationship between engine speed and vehicle speed, resulting in a decoupled state between them. This poses a challenge for engine noise testing. Most OEMs still use traditional gasoline vehicle engine testing methods for noise testing, such as full-throttle acceleration and partial-throttle acceleration, to obtain engine acceleration noise. These methods yield inaccurate results and are complex to implement. Summary of the Invention

[0003] This invention provides a method for testing the acceleration noise of a series hybrid vehicle engine, which can obtain the engine acceleration noise and solves the problems of inaccurate engine acceleration noise results and complex testing methods using traditional methods.

[0004] The technical solution of this invention is described below in conjunction with the accompanying drawings:

[0005] A method for testing the acceleration noise of a series hybrid vehicle engine includes the following steps:

[0006] Step 1: Determine the engine operating curve;

[0007] Step 2: Select and use the adjustment equipment;

[0008] Step 3: Set different vehicle speeds and perform engine acceleration noise tests at each speed;

[0009] Step 4: Collect engine noise data from the engine acceleration noise test and process the data.

[0010] Step 5: Perform data merging on the data processed in Step 4;

[0011] Step 6: Plot the engine acceleration noise curve.

[0012] Furthermore, in step two, one of the following is selected: a vehicle rotating drum, a mobile rotating drum, or a transmission system test bench.

[0013] Furthermore, in step three, different vehicle speeds are set according to different engine power ranges; each engine power range corresponds to a vehicle speed; engine power is controlled using the accelerator pedal.

[0014] Furthermore, in step three, an engine steady-state noise test is performed at each vehicle speed; the measurement points are: in-vehicle noise measurement point, out-of-vehicle noise measurement point, driver position noise measurement point, air intake position noise measurement point, and exhaust position noise measurement point.

[0015] Furthermore, in step four, when collecting engine noise data, the data sampling frequency is above 25600Hz.

[0016] Furthermore, the specific method for data processing in step four is as follows:

[0017] The total noise level is calculated by tracking the engine power, and the engine noise-engine power curve is obtained.

[0018] Furthermore, in step four, the data processing resolution is set to 1Hz and the power tracking interval is set to 1kW.

[0019] Furthermore, in step five, the data is synthesized. The processing principle is that the intersection point of curves at adjacent vehicle speeds is the data connection point. If there is no intersection point, the data at the lower vehicle speed is used.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention can test not only in-vehicle noise, but also engine external noise, intake noise, or exhaust noise. Moreover, it is the first to propose a method for tracking the noise curve of engine power and ultimately obtaining the engine acceleration noise in series mode. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the process of the present invention;

[0024] Figure 2 This is a schematic diagram of the engine operating line in series mode for a certain hybrid vehicle.

[0025] Figure 3 This is a schematic diagram of in-vehicle noise data processing.

[0026] Figure 4 This is a schematic diagram of engine acceleration noise data synthesis. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0028] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0029] Furthermore, "above," "over," and "on top" of the first feature in relation to the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" of the first feature in relation to the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] Furthermore, the terms "first" and "second" are merely used to distinguish between descriptions and have no special meaning.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0034] Example 1

[0035] See Figure 1 A method for testing the acceleration noise of a series hybrid vehicle engine includes the following steps:

[0036] Step 1: Determine the engine operating curve;

[0037] The engine operating curve for a series hybrid vehicle is the sole basis for determining the engine's power, torque, and speed in series mode. It is generally formulated based on factors such as economy, power, and NVH performance, and its determination directly affects the overall engine noise level of the vehicle. Figure 2 As shown.

[0038] Step 2: Select and use the adjustment equipment;

[0039] Choose one of the following three testing devices: a full-vehicle swivel, a mobile swivel, or a transmission system test bench.

[0040] Step 3: Set different vehicle speeds and perform engine acceleration noise tests at each speed;

[0041] During testing, a rotating drum or test bench can be used to maintain a fixed vehicle speed. The principle for speed control is to use only the lowest possible speed (which can be determined based on the MAP calibration of the drum's capacity pedal). Table 1 is recommended for speed setting, but you can also set it yourself according to the actual situation. Use the accelerator pedal to control engine power. At a fixed vehicle speed, slowly control the accelerator pedal to increase engine power and speed. The main measurement points are in-vehicle / out-of-vehicle noise measurement points, driver's position, or other locations (such as air intake or exhaust port locations), as required.

[0042] Table 1: Engine Power Corresponding to Vehicle Speed

[0043] Speed 20km / h 40km / h

[0044] Step 4: Collect engine noise data from the engine acceleration noise test and process the data.

[0045] When collecting engine noise data, the sampling frequency should be above 25600Hz. The data processing method involves tracking engine power to calculate the total noise level and obtaining the engine noise vs. engine power curve. A resolution of 1Hz and a power tracking interval of 1kW are recommended, but these can be adjusted according to actual needs. The processing results are as follows: Figure 3 As shown.

[0046] Step 5: After acquiring noise data at different fixed vehicle speeds, the data needs to be synthesized. The processing principle is that the intersection point of the curves at adjacent vehicle speeds is the data connection point; if there is no intersection point, the data at the lower vehicle speed is used. This yields the engine acceleration noise tracking engine power curve, as shown below. Figure 4 As shown.

[0047] Step 6: Plot the engine acceleration noise curve.

[0048] This invention can be applied to dual-motor series-parallel hybrid vehicles and range-extended vehicles, and can also be used for engine and suspension vibration testing or generator vibration and noise testing.

[0049] In summary, this invention proposes a method for tracking the noise curve of engine power and ultimately obtaining the engine acceleration noise in series mode, which yields more accurate results and is simpler to implement.

[0050] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any person skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention. These simple modifications are all within the scope of protection of the present invention.

[0051] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0052] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for testing the acceleration noise of a series hybrid vehicle engine, characterized in that, Includes the following steps: Step 1: Determine the engine operating curve; Step 2: Select and use the adjustment equipment; Step 3: Set different vehicle speeds and perform engine acceleration noise tests at each speed; Step 4: Collect engine noise data from the engine acceleration noise test and process the data. Step 5: Perform data merging on the data processed in Step 4; Step 6: Plot the engine acceleration noise curve; In step three, different vehicle speeds are set according to different engine power ranges; each engine power range corresponds to a vehicle speed; engine power is controlled using the accelerator pedal. The specific methods for data processing in step four are as follows: The total noise level is calculated by tracking the engine power, and the engine noise-engine power curve is obtained.

2. The method for testing acceleration noise of a series hybrid vehicle engine according to claim 1, characterized in that, In step two, one of the following is selected: a vehicle rotating drum, a mobile rotating drum, or a transmission system test bench.

3. The method for testing acceleration noise of a series hybrid vehicle engine according to claim 1, characterized in that, In step three, engine steady-state noise is tested at each vehicle speed; the measurement points are: in-vehicle noise measurement point, out-of-vehicle noise measurement point, driver position noise measurement point, air intake position noise measurement point, and exhaust position noise measurement point.

4. The method for testing acceleration noise of a series hybrid vehicle engine according to claim 1, characterized in that, In step four, when collecting engine noise data, the data sampling frequency is above 25600Hz.

5. The method for testing acceleration noise of a series hybrid vehicle engine according to claim 1, characterized in that, In step four, the data processing resolution is set to 1Hz and the power tracking interval is set to 1kW.

6. The method for testing acceleration noise of a series hybrid vehicle engine according to claim 1, characterized in that, In step five, the data is synthesized. The processing principle is that the intersection of curves at adjacent vehicle speeds is the data connection point. If there is no intersection, the data at the lower vehicle speed is used.

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