Rotation speed test method for hybrid vehicle charged while parked, device and readable storage medium

Abstract

Disclosed in the embodiments of the present application are a rotation speed test method for a hybrid vehicle charged while parked, a device and a readable storage medium. The rotation speed test method for a hybrid vehicle charged while parked comprises the following steps: performing noise measurement point and vibration measurement point arrangements, the noise measurement point arrangement being to arrange a microphone at a seat position of a vehicle, and the vibration measurement point arrangement being to arrange a sensor on a steering wheel; setting data acquisition parameters; testing operating conditions: obtaining in-vehicle vibration and noise levels at different rotation speed and torque combinations; performing data processing, processed data comprising acquired noise data and vibration data; and, in view of a noise and vibration objective set for the entire vehicle charged while parked, determining a target charging rotation speed corresponding to an engine under the operating condition of charging while parked.

Description

Test methods, equipment, and readable storage media for the parking charging speed of hybrid vehicles.

[0001] This disclosure claims priority to Chinese Patent Application No. 202510203918.4, filed on February 24, 2025, entitled "A Test Method for Parking Charging Speed ​​of Hybrid Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of automotive testing technology, and in particular to a method, equipment, and readable storage medium for testing the parking charging speed of a hybrid vehicle. Background Technology

[0003] Hybrid vehicles are gaining increasing popularity in the market, and major automakers are continuously launching their own hybrid models. Simultaneously, in order to quickly seize market share, the development cycle for vehicle NVH (Noise, Vibration, and Harshness) is constantly being shortened. Parking and charging is one of the common operating conditions for hybrid vehicles during automotive NVH development. Under this condition, quickly determining a reasonable engine charging speed that simultaneously addresses both in-vehicle noise and vibration becomes a pressing issue.

[0004] In related technologies, there is an engine speed control method based on parking charging. This method includes: acquiring the actual engine speed and calculating the speed difference between the actual speed and a pre-stored target speed; calculating the engine's required torque and the motor control torque based on the speed difference; acquiring the motor's actual torque and starting torque, and obtaining slope limit data based on the motor's actual torque; when the engine's actual speed exceeds the idle speed value, switching the starting torque to the motor control torque based on the slope limit data to obtain the motor's required torque; and generating a speed control command based on the engine's required torque and the motor's required torque, the speed control command being used to control the engine speed. However, this method cannot quickly determine a reasonable engine charging speed, thus failing to simultaneously address vehicle noise and vibration. Summary of the Invention

[0005] In view of this, this application provides a method, equipment and readable storage medium for testing the charging speed of a hybrid vehicle while it is parked, which can quickly determine the charging speed of the engine under parking conditions and provide a speed reference for subsequent exhaust tuning.

[0006] On the one hand, the test method for the parking charging speed of this hybrid vehicle includes the following steps:

[0007] The arrangement of noise and vibration measurement points is as follows: the noise measurement point is arranged by placing the microphone at the seat position of the vehicle, and the vibration measurement point is arranged by placing the sensor on the steering wheel.

[0008] Set data acquisition parameters;

[0009] Test conditions were used to obtain the in-vehicle vibration and noise levels under different combinations of speed and torque.

[0010] Data processing, which includes the collected noise data and vibration data;

[0011] Based on the vehicle's set parking charging noise and vibration targets, the engine charging speed under the parking charging condition is determined.

[0012] Optionally, in the arrangement of the noise and vibration measuring points, a microphone is used to collect noise data.

[0013] Optionally, when the vehicle is a left-hand drive vehicle, the noise measurement points are arranged on the driver's seat and the right-side rear seat.

[0014] Optionally, when the vehicle is a right-hand drive vehicle, the noise measurement points are arranged on the driver's seat and the left rear seat.

[0015] Optionally, the noise and vibration measurement points are arranged by using a triaxial accelerometer to collect vibration data, with the sensor positioned at the 12 o'clock position on the steering wheel spokes.

[0016] Optionally, data acquisition uses a Siemens data acquisition system, which includes a signal conditioning module and an analog-to-digital converter. The physical signals captured by the sensors are first converted into electrical signals, then amplified and filtered by the signal conditioning module, and finally converted into digital signals by the analog-to-digital converter for software analysis.

[0017] Optionally, the acquisition parameters are set to a vibration bandwidth of ≥256Hz and a resolution of 1Hz; and a noise bandwidth of ≥10240 and a resolution of 2Hz.

[0018] Optionally, the test conditions include: given the charging power at the engine end, testing the in-vehicle vibration and noise levels under different speed and torque combinations; the charging power range is 3 to 7 kW with a power interval of 2 kW; the speed range is 700 to 1500 rpm with a speed interval of 50 rpm.

[0019] Optionally, during the data acquisition, the method further includes simultaneously monitoring engine speed, engine torque, engine coolant temperature, and intake air temperature.

[0020] The test method for the charging speed of hybrid vehicles under parking conditions has a reasonable structural design. By adopting this test method, the charging speed of the engine under parking conditions can be quickly determined, providing a speed reference for subsequent exhaust tuning. It can also take into account the noise and vibration under parking charging conditions, thus improving development efficiency.

[0021] On the other hand, this application also provides a computer device including a processor and a memory, wherein the memory stores a computer program, which is loaded and executed by the processor to implement the method for testing the parking charging speed of a hybrid vehicle as described in any of the preceding claims.

[0022] On the other hand, this application also provides a computer-readable storage medium storing a computer program that is loaded and executed by a processor to implement the method for testing the parking charging speed of a hybrid vehicle as described in any of the preceding claims.

[0023] On the other hand, this application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium, wherein a processor reads from the computer-readable storage medium and executes the computer program to implement the method for testing the parking charging speed of a hybrid vehicle as described in any of the preceding claims. Attached Figure Description

[0024] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0025] Figure 1 is a schematic diagram of the noise test points in this application;

[0026] Figure 2 is a schematic diagram of the noise-speed correspondence target of this application;

[0027] Figure 3 is a schematic diagram of the vibration-rotation speed corresponding to the target of this application;

[0028] Figure 4 is a flowchart of a method for testing the parking charging speed of a hybrid vehicle provided in this application. Detailed Implementation

[0029] Although this application has been shown and described herein with reference to specific embodiments, it is not intended to be limited to the details shown. Rather, various modifications in detail may be made within the equivalent scope and scope of the claims without departing from this application. In the drawings, the same item numbers refer to the same elements.

[0030] Throughout this disclosure, various terms are used to describe the physical shape or arrangement of features. Many of these terms are used to describe features conforming to a cylindrical or generally cylindrical geometry with the feature as its radius and a central axis perpendicular to that radius. Unless otherwise specified, the terms are given the following meanings: The terms “longitudinal,” “longitudinal,” “axial,” and “axial” refer to a direction, dimension, or orientation parallel to the central axis. The terms “radial” and “radially” refer to a direction, dimension, or orientation perpendicular to the central axis. The terms “inward” and “inner” refer to a direction, dimension, or orientation extending radially toward the central axis. The terms “outward” and “outer” refer to a direction, dimension, or orientation extending radially away from the central axis.

[0031] In this specification, relative terms such as “horizontal,” “vertical,” “upward,” “downward,” “top,” and “bottom,” and their derivatives (e.g., “horizontal,” “downward,” “upward,” etc.) should be interpreted as referring to the direction described or the direction shown in the accompanying drawings. These relative terms are for ease of description and are not generally intended to require a specific direction.

[0032] The specific implementation of this application will be further described in detail below with reference to the accompanying drawings and through the description of the embodiments.

[0033] On the one hand, as shown in Figures 1 to 3, the test method for the parking charging speed of this hybrid vehicle includes the following steps:

[0034] S1. Noise and vibration measurement point arrangement, wherein the noise measurement point arrangement is to place the microphone at the seat position of the vehicle, and the vibration measurement point arrangement is to place the sensor on the steering wheel.

[0035] S2. Set data acquisition parameters;

[0036] S3, Test conditions, to obtain the in-vehicle vibration and noise levels under different speed and torque combinations;

[0037] S4. Data processing, wherein the data processed includes the acquired noise data and vibration data;

[0038] S5. Based on the vehicle's set parking charging noise and vibration targets, determine the engine's charging speed under parking conditions. It should be noted that parking charging refers to a mode where the engine drives the electric motor to generate electricity and charge the battery pack while the vehicle is stationary.

[0039] By employing this testing method, the charging speed of the engine under parking conditions can be quickly determined, providing a speed reference for subsequent exhaust tuning.

[0040] In the arrangement of noise and vibration measurement points, a set of microphones is used to collect noise data. The microphones are arranged at the corresponding seat positions according to the vehicle model, and the placement of the points is flexible.

[0041] As shown in Figure 1, if the vehicle is a left-hand drive model, the noise measurement points are placed on the driver's seat and the right rear seat. If the vehicle is a right-hand drive model, the noise measurement points are placed on the driver's seat and the left rear seat. Because two microphones are placed on the corresponding seats to collect noise data, data can be collected from all directions, resulting in more accurate measurements.

[0042] The noise and vibration measurement points are arranged by using a three-dimensional accelerometer to collect vibration data, with the sensor positioned at the 12 o'clock position on the steering wheel spoke.

[0043] Set data acquisition parameters:

[0044] Data acquisition uses a Siemens data acquisition system, which includes a signal conditioning module and an analog-to-digital converter. The physical signals captured by the sensors are first converted into electrical signals, then amplified and filtered by the signal conditioning module, and finally converted into digital signals by the analog-to-digital converter for software analysis.

[0045] The acquisition parameters were set as follows: vibration bandwidth ≥ 256 Hz, resolution 1 Hz; noise bandwidth ≥ 10240, resolution 2 Hz.

[0046] Simultaneously monitor engine speed, engine torque, engine coolant temperature, and intake air temperature data.

[0047] The test conditions include:

[0048] Given the charging power at the engine end, test the in-vehicle vibration and noise levels under different speed and torque combinations; the charging power range is 3 to 7 kW with a power interval of 2 kW; the speed range is 700 to 1500 rpm with a speed interval of 50 rpm.

[0049] Data processing includes:

[0050] For each operating condition, several sets of data with good consistency are taken, and the average value of the signals is calculated using the built-in function of the acquisition software as the final result.

[0051] Determining the rotational speed includes:

[0052] Based on the data processing results from the above steps, and combined with the vehicle's set parking charging noise and vibration targets, an initial speed is selected so that noise and vibration at this speed can approach or meet the development targets. Subsequent NVH matching development work will then proceed based on this speed.

[0053] The test method for hybrid vehicle parking charging speed in this application embodiment has a reasonable structural design. By adopting this test method, the charging speed of the engine under parking conditions can be quickly determined, providing a speed reference for subsequent exhaust tuning; it can also take into account noise and vibration under parking charging conditions, improving development efficiency.

[0054] The preferred specific example of the embodiments of this application is as follows:

[0055] The test method for the parking charging speed of this hybrid vehicle includes the following steps:

[0056] Noise and vibration measurement point layout - data acquisition - test conditions - data processing - engine speed determination.

[0057] Step 1: Setting up measuring points

[0058] 1. Noise Measurement Points: Noise data was collected using microphones. See Figure 1 for the measurement points. For left-hand drive vehicles, microphones were placed at ①②⑦⑧, where ① and ② are on the driver's seat, and ⑦ and ⑧ are on the right-hand rear seat. For right-hand drive vehicles, microphones were placed at ③④⑤⑥, where ③ and ④ are on the driver's seat, and ⑤ and ⑥ are on the left-hand rear seat.

[0059] 2. Vibration measurement point: Vibration data is collected using a triaxial accelerometer, which is positioned at the 12 o'clock position on the steering wheel spoke.

[0060] Step 2: Set data acquisition parameters in the acquisition software

[0061] 1. Data acquisition utilizes the Siemens Industrial Software data acquisition module (Simcenter Testlab Feature Signal Acquisition). The Siemens data acquisition system consists of two parts: hardware and software. The core hardware comprises a signal conditioning module and an ADC (analog-to-digital converter). Physical signals (such as vibration and noise) captured by sensors (sound sensors, vibration sensors) are first converted into electrical signals, then amplified and filtered by the signal conditioning module, and finally converted into digital signals by the ADC for software analysis.

[0062] 2. Tracking parameter settings: Tracking time, time step 0.1s, total duration 10s.

[0063] 3. Data acquisition parameter settings: Vibration bandwidth setting ≥256Hz, resolution 1Hz; Noise bandwidth setting ≥10240, resolution 2Hz.

[0064] 4. It is recommended to monitor signals such as engine speed, engine torque, engine coolant temperature, and intake air temperature. These signals can be read from the vehicle's OBD diagnostic port using this software.

[0065] Step 3: Test Operating Conditions

[0066] Given the charging power at the engine end, test the in-vehicle vibration and noise levels under different speed and torque combinations. The recommended charging power range is 3–7 kW, with a power interval of 2 kW; the recommended speed range is 700–1500 rpm, with a speed interval of 50 rpm.

[0067] Taking a 3.0kW charging power as an example, see the table below:

[0068] Step 4: Data Processing

[0069] 1. Take three sets of data with good consistency for each operating condition, and use the built-in function of the acquisition software to calculate the average value of the three sets of signals as the final result.

[0070] 2. Noise data processing: Calculate the total sound pressure level (frequency range 20-6400Hz).

[0071] 3. Vibration data processing: Calculate the total vibration magnitude (frequency range 5-100Hz) in the X, Y, and Z directions (these three directions conform to the right-hand rule; the right-hand system is one of the methods for defining a rectangular coordinate system in space; the positive directions of the x-axis, y-axis, and z-axis in this coordinate system are defined as follows: place your right hand at the origin, make your thumb, index finger, and middle finger form right angles with each other, point your thumb in the positive direction of the x-axis, point your index finger in the positive direction of the y-axis, and the direction your middle finger points is the positive direction of the z-axis).

[0072] Physical meaning of frequency domain RMS value: The frequency domain RMS value reflects the energy distribution of the signal in the frequency domain. It can be used to evaluate the strength or noise level of the signal at different frequencies, especially in noise analysis, signal quality assessment and communication system performance analysis.

[0073] Calculating the RMS value in the frequency domain typically involves a Fourier transform of the signal, converting the time-domain signal to the frequency domain to analyze the energy distribution of the signal at different frequencies. The following are the basic steps and formulas for calculating the RMS value from the frequency domain:

[0074] 1. Fourier Transform: First, the Fourier transform is used to convert the time-domain signal into a frequency-domain signal. This reveals the spectral characteristics of the signal, including frequency components and their corresponding amplitudes.

[0075] 2. Spectrum Calculation: In the frequency domain, the spectrum of a signal is represented as a series of frequency components and their corresponding amplitudes. These amplitudes can be real, imaginary, or complex.

[0076] 3. Sum of Squares of Spectrum: Calculates the square of the amplitude of each frequency component in the spectrum, which represents the energy of the signal at each frequency point.

[0077] 4. Integration or Summation: Integrate (for continuous signals) or sum (for discrete signals) the squares of the amplitudes of all frequency components. This step is equivalent to calculating the energy of the signal in the frequency domain.

[0078] 5. Root Mean Square (RMS) Calculation: Divide the energy value obtained in the above steps by the signal bandwidth or the number of sampling points, then take the square root to obtain the frequency domain RMS value. For discrete signals, the formula can be expressed as:

[0079] Where X[k] is the discrete Fourier transform of the signal, and N is the number of sampling points of the signal.

[0080] Step 5: Determine the rotation speed

[0081] Based on the data processing results from step four, and combined with the vehicle's set parking charging noise and vibration targets, a target charging speed is initially selected. This target charging speed ensures that noise and vibration levels approach or meet the development goals. Specifically, among multiple speeds, the difference between the engine's noise value and the target noise value, and the difference between the engine's vibration value and the target vibration value, are minimized at the target speed. For example, the difference between the engine's noise value and the target noise value, and the difference between the engine's vibration value and the target vibration value, can be calculated separately at each speed. Then, the absolute values ​​of these two differences are assigned weighting coefficients and summed. The result is compared, and the speed corresponding to the minimum sum is set as the target speed. Subsequent NVH matching development work is then carried out based on this target speed.

[0082] Using Figures 2 and 3 as examples, the noise development target is 48.5 dB(A), the vibration development target is 2.0 mm / s, and 1350 rpm can be used to determine the parking charging speed. This speed can balance both noise (the lower the better) and vibration (the lower the better).

[0083] Step Six: When the vehicle is in parking charging mode, control the engine to rotate at the target charging speed, so that the vibration and noise values ​​of the engine when rotating at the target charging speed can be close to the target vibration and noise values ​​that meet the development requirements.

[0084] On the other hand, this application also provides a computer device including a processor and a memory, the memory storing a computer program, which is loaded and executed by the processor to implement the method for testing the parking charging speed of a hybrid vehicle as described in any of the embodiments of this application above.

[0085] On the other hand, this application also provides a computer-readable storage medium storing a computer program that is loaded and executed by a processor to implement a method for testing the parking charging speed of a hybrid vehicle as described in any of the embodiments of this application above.

[0086] On the other hand, this application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium, and a processor reads from the computer-readable storage medium and executes the computer program to implement the method for testing the parking charging speed of a hybrid vehicle as described in any of the embodiments of this application above.

[0087] This application also provides a method for testing the parking charging speed of a hybrid vehicle. In the first aspect, the method for testing the parking charging speed of a hybrid vehicle includes the following steps:

[0088] S1. Arrangement of noise and vibration measuring points;

[0089] S2, Data Acquisition;

[0090] S3, Test Condition;

[0091] S4, Data Processing;

[0092] S5. Determine the engine speed based on the vehicle's set parking charging noise and vibration targets.

[0093] The second item is based on the first item, wherein in step S1, a microphone is used to collect noise data.

[0094] The third item is based on the second item. For left-hand drive vehicles, the noise measurement points are placed on the driver's seat and the right-side rear seat.

[0095] The fourth item is based on the second item, wherein, in step S1, if it is a right-hand drive vehicle, the noise measurement points are arranged on the driver's seat and the left-hand seat in the rear row.

[0096] The fifth item is based on the first item. In step S1, a three-dimensional acceleration sensor is used to collect vibration data. The sensor is arranged at the 12 o'clock position on the steering wheel spoke.

[0097] The sixth item is based on the first item. In step S2, data acquisition uses a Siemens data acquisition system, which includes a signal conditioning module and an analog-to-digital converter. The physical signals captured by the sensors are first converted into electrical signals, then amplified and filtered by the signal conditioning module, and finally converted into digital signals by the analog-to-digital converter for software analysis.

[0098] The seventh item is based on the sixth item, wherein in step S2, the acquisition parameters are set as follows: vibration bandwidth is set to ≥256Hz, and the resolution is 1Hz; noise bandwidth is set to ≥10240, and the resolution is 2Hz.

[0099] The eighth item is based on the first item. In step S3, given the charging power at the engine end, the vibration and noise levels inside the vehicle are tested under different speed and torque combinations. The charging power range is 3 to 7 kW with a power interval of 2 kW. The speed range is 700 to 1500 rpm with a speed interval of 50 rpm.

[0100] The ninth item is based on the first item, wherein in step S2, engine speed, engine torque, engine coolant temperature and intake air temperature are monitored simultaneously.

[0101] The present application has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present application is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present application, or the direct application of the concept and technical solution of the present application to other occasions without modification, are all within the protection scope of the present application.

Claims

1. A method for testing the parking charging speed of a hybrid vehicle, wherein, The testing method includes the following steps: The arrangement of noise and vibration measurement points is as follows: the noise measurement point is arranged by placing the microphone at the seat position of the vehicle, and the vibration measurement point is arranged by placing the sensor on the steering wheel. Set data acquisition parameters; Test conditions were used to obtain the in-vehicle vibration and noise levels under different combinations of speed and torque. Data processing, which includes the collected noise data and vibration data; Based on the vehicle's set parking charging noise and vibration targets, the target charging speed of the engine under the parking charging condition is determined.

2. The test method for the parking charging speed of a hybrid vehicle as described in claim 1, wherein, In the arrangement of noise and vibration measurement points, a microphone is used to collect noise data.

3. The test method for the parking charging speed of a hybrid vehicle as described in claim 2, wherein, When the vehicle is a left-hand drive vehicle, the noise measurement points are placed on the driver's seat and the right rear seat.

4. The test method for the parking charging speed of a hybrid vehicle as described in claim 2, wherein, When the vehicle is a right-hand drive vehicle, the noise measurement points are placed on the driver's seat and the left rear seat.

5. The test method for the parking charging speed of a hybrid vehicle as described in claim 1, wherein, The noise and vibration measurement points are arranged by using a three-dimensional accelerometer to collect vibration data, with the sensor positioned at the 12 o'clock position on the steering wheel spokes.

6. The test method for the parking charging speed of a hybrid vehicle as described in claim 1, wherein, Data acquisition uses a Siemens data acquisition system, which includes a signal conditioning module and an analog-to-digital converter. The physical signals captured by the sensors are first converted into electrical signals, then amplified and filtered by the signal conditioning module, and finally converted into digital signals by the analog-to-digital converter for software analysis.

7. The test method for the parking charging speed of a hybrid vehicle as described in claim 6, wherein, The acquisition parameters were set as follows: vibration bandwidth ≥ 256 Hz, resolution 1 Hz; noise bandwidth ≥ 10240, resolution 2 Hz.

8. The test method for the parking charging speed of a hybrid vehicle as described in claim 1, wherein, The test conditions include: given the charging power at the engine end, testing the in-vehicle vibration and noise levels under different speed and torque combinations; the charging power range is 3 to 7 kW with a power interval of 2 kW; the speed range is 700 to 1500 rpm with a speed interval of 50 rpm.

9. The test method for the parking charging speed of a hybrid vehicle as described in claim 1, wherein, During the data acquisition process, the method further includes monitoring engine speed, engine torque, engine coolant temperature, and intake air temperature.

10. A computer device, wherein, The computer device includes a processor and a memory, the memory storing a computer program, which is loaded and executed by the processor to implement the test method for the parking charging speed of a hybrid vehicle as described in any one of claims 1 to 9.

11. A computer-readable storage medium, wherein, The computer-readable storage medium stores a computer program, which is loaded and executed by a processor to implement the method for testing the parking charging speed of a hybrid vehicle as described in any one of claims 1 to 9.

12. A computer program product, wherein, The computer program product includes a computer program stored in a computer-readable storage medium, and a processor reads and executes the computer program from the computer-readable storage medium to implement the test method for the parking charging speed of a hybrid vehicle as described in any one of claims 1 to 9.

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