A method for testing exhaust tailpipe noise of a PHEV passenger vehicle

Abstract

The application discloses a kind of PHEV passenger car exhaust tail pipe noise test method, comprising the following steps: step one, install data acquisition equipment, set test conditions;Step two, idle speed operating condition test: first engine stop state is carried out noise test, and test result is obtained;Step three, acceleration operating condition test: first pure electric driving condition is carried out background noise test, then engine direct drive operating condition test is carried out, background noise is eliminated when data processing, and test result is obtained.The test method of the application does not need to build half-muffled room with rotating hub, just needs to be in ordinary test road, greatly widens test environment, and greatly reduces test cost.

Description

Technical Field

[0001] This invention belongs to the field of PHEV passenger vehicle performance testing technology, specifically relating to a method for testing exhaust tailpipe noise in PHEV passenger vehicles. Background Technology

[0002] Passenger vehicles combine the advantages of both gasoline and electric vehicles, allowing for both long-distance travel with gasoline and reduced urban driving costs with pure electric power. Since hybrid passenger vehicles still contain an engine, exhaust noise remains a key concern to meet overall vehicle NVH (Noise, Vibration, and Harshness) targets. Current exhaust noise testing methods involve testing in a semi-anechoic chamber with a rotating drum. Many developers and OEMs possess semi-anechoic chambers without rotating drums, but due to the high construction and maintenance costs of semi-anechoic chambers with rotating drums, they have not yet built such chambers. Furthermore, many existing semi-anechoic chambers only have front-wheel-drive rotating drums, which cannot meet the development requirements of four-wheel-drive hybrid passenger vehicles. Summary of the Invention

[0003] To address the aforementioned problems in existing technologies, this invention provides a method for testing exhaust tailpipe noise in PHEV passenger vehicles. This method eliminates the need for a semi-anechoic chamber with a rotating hub and can be conducted on ordinary test roads, greatly expanding the testing environment and significantly reducing testing costs.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A method for testing exhaust tailpipe noise in a PHEV passenger vehicle includes the following steps:

[0006] Step 1: Install the data acquisition equipment and set the test conditions;

[0007] Step 2, Idle condition test: First, conduct a background noise test, then conduct tests according to the corresponding operating conditions. During data processing, remove background noise to obtain the test results.

[0008] Step 3, Accelerated Operating Condition Test: First, conduct a background noise test, then conduct tests according to the corresponding operating conditions. During data processing, remove background noise to obtain the test results.

[0009] Preferably, in step one, the data acquisition device includes a microphone, which is placed on the left and right sides of the exhaust tailpipe of the passenger vehicle, offset outward at 45°, and 500mm away from the center of the tailpipe interface.

[0010] Preferably, the data acquisition device is powered by a battery.

[0011] Preferably, in step one, the test conditions include: the test method is performed on a test road, and the test is conducted on a road with clear weather and stable noise.

[0012] Furthermore, step two includes:

[0013] S21. Conduct background noise testing with the engine stopped.

[0014] S22. Engine Idle Charging Condition Test: Adjust the vehicle to engine working mode, and after the engine starts, wait for the engine speed to stabilize before conducting the test;

[0015] S23. Perform data processing: Calculate the difference between the idle speed test results and the engine stop state test results, i.e., remove background noise, to obtain the vehicle tailpipe idle speed test results and complete the exhaust tailpipe noise test under idle conditions.

[0016] Preferably, the background noise test and the engine idling charging condition test are performed multiple times, and the data with high repeatability are taken as the test result after removing bad data.

[0017] Furthermore, step three includes:

[0018] S31. Conduct background noise test: The background noise test must be conducted under pure electric driving conditions. After starting the vehicle, accelerate at full throttle and conduct the noise test.

[0019] S32. Conduct engine direct drive test: Adjust the control strategy to put the vehicle into engine direct drive, no electric motor assistance condition, and then accelerate at full throttle to test;

[0020] S33. Perform data processing, subtract the engine direct drive test results and the pure electric condition test results to remove background noise, and obtain the engine direct drive tailpipe noise test results during vehicle acceleration, thus completing the exhaust tailpipe noise test under acceleration conditions.

[0021] Preferably, the background noise test and the engine direct drive condition test are performed multiple times, and the data with high repeatability are taken as the test result after removing bad data.

[0022] The present invention has the following advantages:

[0023] This invention provides a method for testing the exhaust tailpipe noise of PHEV passenger vehicles. This method does not require the construction of a semi-anechoic chamber with a rotating hub, and can be carried out on ordinary test roads, which greatly expands the test environment and significantly reduces the test cost. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a flowchart of a method for testing the exhaust tailpipe noise of a PHEV passenger vehicle according to an embodiment of the present invention. Detailed Implementation

[0026] 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.

[0027] Example

[0028] A method for testing exhaust tailpipe noise in PHEV passenger vehicles includes idling condition testing and acceleration condition testing. Each test requires a background noise test first, followed by testing according to the corresponding operating conditions. During data processing, subtraction is required to remove background noise and obtain the final result.

[0029] Step 1: Install the data acquisition equipment and set the test conditions:

[0030] The data acquisition device is a microphone, which should be placed on either side of the exhaust tailpipe of the passenger vehicle, angled outwards at 45°, and 500mm from the center of the tailpipe interface. Due to potential vibrations during testing, the microphone must be securely fixed with a mounting bracket to prevent shaking or dropping. The data acquisition device is battery-powered and placed inside the vehicle under test.

[0031] This test method involves conducting tests on roads that are clear, quiet, and stable, after the test road has been completed.

[0032] Step 2, Idle Speed ​​Test:

[0033] S21. First, conduct a background noise test: The test is conducted with the engine stopped. The test needs to be performed multiple times. After removing bad data, the data with high repeatability is taken as the test result.

[0034] S22. Engine Idle Charging Condition Test: Adjust the vehicle to engine working mode, which is the normal engine idle charging condition; after the engine starts, wait for the engine speed to stabilize before conducting the test. The test needs to be performed multiple times, and after removing bad data, take the data with high repeatability as the test result.

[0035] S23. Data processing after the test: The difference between the idle speed test result and the engine stop state test result can be used to remove background noise and obtain the vehicle tailpipe idle speed test result, thus completing the exhaust tailpipe noise test under idle conditions.

[0036] Step 3: Accelerated operating condition test:

[0037] S31. First, conduct a background noise test. The background noise test must be conducted under pure electric driving conditions. After the vehicle is started, accelerate at full throttle and conduct a noise test. The test needs to be conducted multiple times. After removing bad data, take the data with high repeatability as the test result. This test result will be used as the background noise.

[0038] S32. Next, the engine direct drive condition test is carried out. By adjusting the control strategy, the vehicle is put into the engine direct drive and no electric motor assistance condition. Then, the test is carried out by accelerating at full throttle. The test needs to be carried out multiple times. After removing bad data, the data with high repeatability is taken as the test result.

[0039] S33. After the test is completed, data processing is performed. The engine direct drive test result and the pure electric condition test result are subtracted to remove the background noise and obtain the engine direct drive tailpipe noise test result during vehicle acceleration, thus completing the exhaust tailpipe noise test under acceleration conditions.

[0040] 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.

Claims

1. A method for testing exhaust tailpipe noise in a PHEV passenger vehicle, characterized in that, Includes the following steps: Step 1: Install the data acquisition equipment and set the test conditions; Step Two, Idle Condition Test: First, a background noise test is conducted, followed by tests under the corresponding operating conditions. Background noise is removed during data processing to obtain the test results. Step Two includes: S21. Conduct background noise testing with the engine stopped. S22. Engine Idle Charging Condition Test: Adjust the vehicle to engine working mode, and after the engine starts, wait for the engine speed to stabilize before conducting the test; S23. Perform data processing: Calculate the difference between the idle speed test results and the engine stop state test results, i.e., remove background noise, to obtain the vehicle tailpipe idle speed test results and complete the idle speed condition exhaust tailpipe noise test. Step 3, Accelerated Operating Condition Testing: First, conduct background noise testing, then perform testing according to the corresponding operating conditions. Background noise is removed during data processing to obtain the test results. Step 3 includes: S31. Conduct background noise test: The background noise test must be conducted under pure electric driving conditions. After starting the vehicle, accelerate at full throttle and conduct the noise test. S32. Conduct engine direct drive test: Adjust the control strategy to put the vehicle into engine direct drive, no electric motor assistance condition, and then accelerate at full throttle to test; S33. Perform data processing, subtract the engine direct drive test results and the pure electric condition test results to remove background noise, and obtain the engine direct drive tailpipe noise test results during vehicle acceleration, thus completing the exhaust tailpipe noise test under acceleration conditions.

2. The method for testing exhaust tailpipe noise of a PHEV passenger vehicle as described in claim 1, characterized in that, In step one, the data acquisition device includes a microphone, which is placed on the left and right sides of the exhaust tailpipe of the passenger vehicle, offset outward at 45°, and 500mm away from the center of the tailpipe interface.

3. The method for testing exhaust tailpipe noise of a PHEV passenger vehicle as described in claim 2, characterized in that, The data acquisition device is powered by a battery.

4. The method for testing exhaust tailpipe noise of a PHEV passenger vehicle as described in claim 1, characterized in that, In step one, the test conditions include: the test method is completed on the test road, and the test is conducted on a road with clear weather and stable noise.

5. The method for testing exhaust tailpipe noise of a PHEV passenger vehicle as described in claim 1, characterized in that, Both the background noise test and the engine idling charging condition test were performed multiple times, and after removing bad data, the data with high repeatability were taken as the test results.

6. The method for testing exhaust tailpipe noise of a PHEV passenger vehicle as described in claim 1, characterized in that, Both the background noise test and the engine direct drive condition test were performed multiple times, and after removing bad data, the data with high repeatability were taken as the test results.

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