Method and system for testing noise of hybrid electric drive assembly of hybrid vehicle with small-capacity battery

Abstract

The invention provides a method and a system for testing noise of a hybrid electric drive assembly of a hybrid vehicle with a small-capacity battery. The method comprises the following steps: arranging a microphone at a noise testing point; arranging a vibration acceleration sensor at the vibration measuring point; under the pure electric working condition, the vehicle speed starts from 0 km / h, the motor torque is controlled through an accelerator pedal, slow acceleration is conducted at the motor torque of 30 Nm, 50 Nm and 70 Nm respectively till the electric quantity of a battery is consumed to the lower limit, and the hybrid working condition is started; synchronously recording vibration noise of each measuring point and motor rotating speed and torque data; working condition testing is carried out, and acceleration signals of all the vibration measuring points and sound pressure signals of all the noise measuring points under different working conditions are obtained; and analyzing and processing the test data, and confirming the noise source distribution and the noise source resonance frequency. According to the method, the electric drive howling can be effectively tested, analyzed and evaluated through specially set vibration noise test working conditions and data processing parameters of the electric drive assembly in the whole vehicle state of the hybrid power vehicle with the small-capacity battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive assembly noise testing, and in particular relates to a noise testing method and a testing system for a hybrid electric drive assembly in a complete vehicle state of a hybrid vehicle type with a small-capacity battery. Background Art

[0003] As hybrid electric drive products are gradually applied and put on the market, the "howling" generated by the hybrid electric drive motor during operation will affect the NVH performance of the entire vehicle. It is necessary to conduct noise testing and evaluation of electric drive howling during the vehicle development stage to identify risks. For hybrid models with small-capacity batteries, the noise evaluation and evaluation conditions of hybrid electric drives are different and require special settings. There are many research reports on new energy vehicles on the market, but most of them focus on pure electric vehicles and plug-in hybrid vehicles. For small-capacity hybrid vehicles, because it involves how to allocate the power output of the internal combustion engine and how to balance the power output of the hybrid vehicle with the noise of the electric drive system, there are currently few relevant literature on such models. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a hybrid electric drive assembly noise testing method and testing system for a hybrid vehicle model with a small-capacity battery. By specially setting the electric drive assembly vibration noise test conditions and data processing parameters of a hybrid vehicle model with a small-capacity battery in the whole vehicle state, the electric drive howl can be effectively tested, analyzed and evaluated.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] As a first aspect of the present invention, a method for testing the noise of a hybrid electric drive assembly of a hybrid vehicle with a small-capacity battery is provided, comprising the following steps:

[0007] S1. Arrange the sensor system:

[0008] S11. Arrange microphones at noise measurement points;

[0009] S12. Arrange vibration acceleration sensors at vibration measuring points;

[0010] S2. Set test conditions;

[0011] S3. Perform the working condition test according to the test condition set in step S2 to obtain the acceleration signal of each vibration measuring point and the sound pressure signal of each noise measuring point under different working conditions;

[0012] S4. Analyze and process the test data to confirm the noise source distribution and the noise source resonance frequency.

[0013] Furthermore, the step S11 includes: arranging microphones on the outer ear of the left front seat and the right rear seat in the vehicle respectively; and arranging a microphone 0.1 m away from the outer contour of the hybrid electric drive.

[0014] Furthermore, in step S11, for a passenger car equipped with a third row of seats, a microphone is added in the middle position of the third row of seats.

[0015] Further, the step S12 includes: arranging a three-directional acceleration sensor at the front, top, bottom, rear, left or right side of the electric drive housing.

[0016] Furthermore, in step S12, the coordinate system is defined as follows: the forward direction of the vehicle is the X direction, the left and right horizontal direction is the Y direction, and the up and down direction is the Z direction.

[0017] Furthermore, the step S2 comprises:

[0018] In hybrid mode, the battery is charged to the set power, and the test starts after entering the pure electric mode;

[0019] Under pure electric conditions, the vehicle speed starts from 0km / h, and the motor torque is controlled by the accelerator pedal, with slow acceleration at motor torques of 30Nm, 50Nm, and 70Nm respectively, until the battery power is consumed to the lower limit and the hybrid condition is entered; the vibration noise of each measuring point and the motor speed and torque data are recorded simultaneously.

[0020] Furthermore, the step S4 comprises:

[0021] S41. Perform FFT analysis on the acceleration signals of each vibration measuring point measured in step S3 to obtain the vibration Colormap spectrum of each measuring point;

[0022] S42. Perform FFT analysis on the sound pressure signals of each noise measuring point measured in step S3 to obtain the noise Colormap spectrum of each measuring point;

[0023] S43. Obtain the noise order noise curve of each measuring point according to the speed and noise order;

[0024] S44. Obtain the total sound pressure level curve of each measuring point according to the speed and the sound pressure signal of each measuring point;

[0025] S45. Analyze the Colormap spectrum of noise and vibration signals to determine the distribution of major noise sources and the resonance frequency of the noise sources.

[0026] As a second aspect of the present invention, a hybrid electric drive assembly noise test system for a hybrid vehicle with a small-capacity battery is provided, which is used to implement the analysis method, and includes a sensor system, a data acquisition system, and a data analysis system;

[0027] The sensor system is used to detect noise data and vibration data of the electric drive assembly;

[0028] The data acquisition system is used to set the test conditions and obtain the detection data of the sensor system under the test conditions, and to send the detection data to the data analysis system after data preprocessing;

[0029] The data analysis system is used to receive the detection data sent by the data acquisition system, analyze the detection data, obtain the noise and vibration signal Colormap spectrum, and confirm the noise source distribution and the noise source resonance frequency.

[0030] Further, the sensor system includes a microphone and a vibration acceleration sensor;

[0031] The microphone meets the requirements of type 1 instrument specified in GB / T 3785.1, and the frequency range covers the frequency range of 20 Hz to 20 kHz;

[0032] The vibration acceleration sensor is a triaxial vibration acceleration sensor with a frequency response range of not less than 0.5 Hz to 10 kHz and a weight not exceeding 8 g.

[0033] Furthermore, the data acquisition system has an A / D conversion resolution of no less than 24 bits, has a data sampling capability of at least 51.2 kHz, and has the functions of measuring sound pressure level, vibration level, rotation speed, and spectrum analysis.

[0034] The present invention has the following advantages:

[0035] The present invention provides a hybrid electric drive assembly noise test method and test system for a hybrid vehicle model with a small-capacity battery. By means of specially set electric drive assembly vibration noise test conditions and data processing parameters in a whole vehicle state of a hybrid vehicle model with a small-capacity battery, the electric drive howl can be effectively tested, analyzed and evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0037] Figure 1 This is a flow chart of a method for testing noise of a hybrid electric drive assembly of a hybrid vehicle type with a small-capacity battery as described in Example 1 of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment is a method for testing the noise of a hybrid electric drive assembly of a hybrid vehicle with a small-capacity battery, comprising the following steps:

[0042] S1. Arrange the sensor system:

[0043] S11. Arrange microphones at noise measurement points:

[0044] Microphones are arranged on the outer ear of the left front seat and the outer ear of the right rear seat in the car; for passenger cars equipped with a third row of seats, an additional microphone should be arranged in the middle of the third row of seats;

[0045] A microphone is placed 0.1m away from the outer contour of the hybrid electric drive;

[0046] S12. Arrange vibration acceleration sensors at vibration measurement points:

[0047] A three-directional acceleration sensor is arranged at the front, top, bottom, back, left or right side of the electric drive housing;

[0048] The coordinate system is defined as: the vehicle's forward direction is the X direction, the left and right horizontal direction is the Y direction, and the up and down direction is the Z direction.

[0049] S2. Set up the test conditions:

[0050] In hybrid operation, the battery is charged to the set power, and the test begins after entering the pure electric operation.

[0051] In pure electric mode, the vehicle speed starts from 0km / h, and the motor torque is controlled by the accelerator pedal, and the motor torque is slowly accelerated at 30Nm, 50Nm, and 70Nm respectively, until the battery power is consumed to the lower limit and the hybrid mode is entered; the vibration noise of each measuring point and the speed and torque data of the 4 motors are recorded simultaneously. Each mode is recorded three times.

[0052] S3. Perform working condition test and obtain test data:

[0053] Performing a working condition test according to the test working condition set in step S2, and obtaining the acceleration signal of each vibration measuring point and the sound pressure signal of each noise measuring point under different working conditions;

[0054] S4. Analyze and process the test data to confirm the noise source distribution and the noise source resonance frequency.

[0055] S41. Perform FFT analysis on the acceleration signals of each vibration measuring point measured in step S3 to obtain the vibration Colormap spectrum of each measuring point;

[0056] S42. Perform FFT analysis on the sound pressure signals of each noise measuring point measured in step S3 to obtain the noise Colormap spectrum of each measuring point;

[0057] S43. Obtain the noise order noise curve of each measuring point according to the speed and the noise order to be analyzed; wherein the noise order is determined according to the number of stator slots of the hybrid motor;

[0058] S44. Obtain the total sound pressure level curve of each measuring point according to the speed and the sound pressure signal of each measuring point;

[0059] S45. Analyze the Colormap spectrum of noise and vibration signals to determine the distribution of major noise sources and the resonance frequency of the noise sources.

[0060] Example 2

[0061] This embodiment is a hybrid electric drive assembly noise test system for a hybrid vehicle with a small-capacity battery, which is used to implement the analysis method described in Example 1, and includes a sensor system, a data acquisition system, and a data analysis system;

[0062] The sensor system is used to detect noise data and vibration data of the electric drive assembly;

[0063] The data acquisition system is used to set the test conditions and obtain the detection data of the sensor system under the test conditions, and to send the detection data to the data analysis system after data preprocessing;

[0064] The data analysis system is used to receive the detection data sent by the data acquisition system, analyze the detection data, obtain the noise and vibration signal Colormap spectrum, and confirm the noise source distribution and the noise source resonance frequency.

[0065] The sensor system includes a microphone and a vibration acceleration sensor.

[0066] The microphone should meet the requirements of Type 1 instrument specified in GB / T 3785.1, and the frequency range should cover the frequency range of 20Hz to 20kHz. Before and after each measurement, each microphone must be calibrated with a Class 1 sound calibrator that meets the requirements of GB / T 15173. Without any adjustment, the deviation between the two calibrations shall not exceed 0.5dB. If the deviation is exceeded, the measurement result shall be invalid.

[0067] The microphone placement positions include: the outer ear of the left front seat, the outer ear of the right rear seat, and the position 0.1m away from the outer contour of the hybrid electric drive. For passenger cars equipped with a third row of seats, an additional microphone should be placed in the middle of the third row of seats.

[0068] The vibration acceleration sensor is specifically a triaxial vibration acceleration sensor with a frequency response range of not less than 0.5 Hz to 10 kHz and a weight not exceeding 8 g.

[0069] The vibration acceleration sensor arrangement positions include: arranging a three-direction acceleration sensor in front, top, bottom, back, left or right of the electric drive housing. The coordinate system is defined as: the vehicle forward direction is the X direction, the left and right horizontal direction is the Y direction, and the up and down direction is the Z direction.

[0070] The data acquisition system has an A / D conversion resolution of no less than 24 bits, a data sampling capability of at least 51.2 kHz, and has measurement and spectrum analysis functions for sound pressure level, vibration level, rotation speed, etc.

[0071] The test conditions are:

[0072] For hybrid models with larger battery capacity, the usual vibration and noise test condition is the POT condition: with a throttle opening of 40%-60%, accelerating from 0km / h to 120km / h at an acceleration of 0.1g or 0.2g, the vibration and noise characteristics of the electric drive assembly under this condition are analyzed.

[0073] For hybrid models with small-capacity batteries, due to the small battery capacity, if the vibration and noise test is performed according to the POT working condition of ordinary hybrid models, the accelerator is pressed deeply and the vehicle power demand is large. At this time, the motor output torque is large and the power consumption is fast. In a very short time, it will transition from the pure electric driving condition to the hybrid condition. The short pure electric condition test time cannot obtain time domain data of sufficient length, which in turn affects the accuracy of subsequent data processing. Therefore, special test conditions need to be set. The conditions are as follows:

[0074] In hybrid operation, the battery is charged to the set power, and the test begins after entering the pure electric operation.

[0075] In pure electric mode, the vehicle speed starts from 0km / h, and the motor torque is controlled by the accelerator pedal, and the vehicle is slowly accelerated with motor torques of 30Nm, 50Nm, and 70Nm respectively, until the battery power is consumed to the lower limit and the hybrid mode is entered. The vibration noise of each measuring point and the speed and torque data of the 4 motors are recorded simultaneously. Each condition is recorded three times.

[0076] Accelerating with small torque can avoid entering hybrid mode too early, extend the test time, and better reproduce the electric drive howling phenomenon.

[0077] When the data analysis system analyzes the detection data, it performs noise signal analysis and vibration signal analysis respectively. Specifically, the vibration signal analysis frequency should be ≥12800Hz, the noise signal analysis frequency should be ≥25600Hz, the frequency resolution is set to 6Hz, the time step of time tracking analysis is set to 0.1s, and the bandwidth of order analysis is 0.5 order (±0.25).

[0078] In this embodiment, the main order noise of the hybrid motor is the order of the stator tooth number.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing the noise of a hybrid electric drive assembly of a hybrid vehicle with a small-capacity battery, characterized in that: The following steps are involved: S1. Arrange the sensor system: S11. Arrange microphones at noise measurement points; S12. Arrange vibration acceleration sensors at vibration measuring points; S2. Set test conditions; S3. Perform the working condition test according to the test condition set in step S2 to obtain the acceleration signal of each vibration measuring point and the sound pressure signal of each noise measuring point under different working conditions; S4. Analyze and process the test data to confirm the noise source distribution and the noise source resonance frequency.

2. The noise testing method for a hybrid electric drive assembly of a hybrid vehicle with a small-capacity battery as claimed in claim 1, characterized in that: The step S11 includes: placing microphones on the outer ear of the left front seat and the outer ear of the right rear seat in the vehicle respectively; and placing a microphone 0.1 m away from the outer contour of the hybrid electric drive.

3. The noise testing method for a hybrid electric drive assembly of a hybrid vehicle with a small capacity battery as claimed in claim 2, characterized in that: In step S11, for a passenger car equipped with a third row of seats, a microphone is added in the middle of the third row of seats.

4. The noise testing method for a hybrid electric drive assembly of a hybrid vehicle with a small capacity battery as claimed in claim 1, characterized in that: The step S12 includes: arranging a three-directional acceleration sensor at the front, top, bottom, back, left or right side of the electric drive housing.

5. The noise testing method for a hybrid electric drive assembly of a hybrid vehicle with a small capacity battery as claimed in claim 4, characterized in that: In step S12, the coordinate system is defined as follows: the vehicle forward direction is the X direction, the left and right horizontal direction is the Y direction, and the up and down direction is the Z direction.

6. The noise testing method for a hybrid electric drive assembly of a hybrid vehicle with a small capacity battery as claimed in claim 1, characterized in that: The step S2 comprises: In hybrid mode, the battery is charged to the set power, and the test starts after entering the pure electric mode; Under pure electric conditions, the vehicle speed starts from 0km / h, and the motor torque is controlled by the accelerator pedal, with slow acceleration at motor torques of 30Nm, 50Nm, and 70Nm respectively, until the battery power is consumed to the lower limit and the hybrid condition is entered; the vibration noise of each measuring point and the motor speed and torque data are recorded simultaneously.

7. The noise testing method for a hybrid electric drive assembly of a hybrid vehicle with a small capacity battery as claimed in claim 1, characterized in that: The step S4 comprises: S41. Perform FFT analysis on the acceleration signals of each vibration measuring point measured in step S3 to obtain the vibration Colormap spectrum of each measuring point; S42. Perform FFT analysis on the sound pressure signals of each noise measuring point measured in step S3 to obtain the noise Colormap spectrum of each measuring point; S43. Obtain the noise order noise curve of each measuring point according to the speed and noise order; S44. Obtain the total sound pressure level curve of each measuring point according to the speed and the sound pressure signal of each measuring point; S45. Analyze the Colormap spectrum of noise and vibration signals to determine the distribution of major noise sources and the resonance frequency of the noise sources.

8. A hybrid electric drive assembly noise test system for a hybrid vehicle with a small capacity battery, used to implement the analysis method as claimed in any one of claims 1 to 7, characterized in that: Including sensor system, data acquisition system, data analysis system; The sensor system is used to detect noise data and vibration data of the electric drive assembly; The data acquisition system is used to set the test conditions and obtain the detection data of the sensor system under the test conditions, and to send the detection data to the data analysis system after data preprocessing; The data analysis system is used to receive the detection data sent by the data acquisition system, analyze the detection data, obtain the noise and vibration signal Colormap spectrum, and confirm the noise source distribution and the noise source resonance frequency.

9. A hybrid electric drive assembly noise test system for a hybrid vehicle with a small capacity battery as claimed in claim 8, characterized in that: The sensor system includes a microphone and a vibration acceleration sensor; The microphone meets the requirements of type 1 instrument specified in GB / T 3785.1, and the frequency range covers the frequency range of 20 Hz to 20 kHz; The vibration acceleration sensor is a triaxial vibration acceleration sensor with a frequency response range of not less than 0.5 Hz to 10 kHz and a weight not exceeding 8 g.

10. A hybrid electric drive assembly noise test system for a hybrid vehicle with a small capacity battery as claimed in claim 8, characterized in that: The data acquisition system has an A / D conversion resolution of no less than 24 bits, a data sampling capability of at least 51.2 kHz, and has the functions of measuring sound pressure level, vibration level, rotation speed, and spectrum analysis.

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