A NVH performance adaptation method for new energy vehicle air conditioners

Abstract

The present invention relates to the field of automotive control technology and provides a method for adapting the NVH performance of a new energy vehicle air conditioner. The method comprises the following steps: S1, determining the minimum speed Rmin and maximum speed Rmax of the compressor during stable operation, which constitute speed range I of the compressor; S2, obtaining the resonance point between the vibration acceleration of the target component in the vehicle and the vibration acceleration of the compressor; S3, removing the compressor speed corresponding to the vibration acceleration resonance point within speed range I to form a compressor speed range II; and S4, controlling the compressor speed to be within speed range II when the vehicle air conditioner is in operation. By removing the compressor speed value corresponding to the vibration acceleration resonance point within speed range I and obtaining the speed value at which the vehicle interior noise and compressor noise are coupled, the user's vibration sensation and vehicle interior noise are reduced, thereby improving the NVH performance of the new energy vehicle air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle air conditioners and provides a method for adapting the NVH performance of a new energy vehicle air conditioner. Background Art

[0002] In-vehicle noise directly impacts the ride comfort and health of occupants. With the development of the automotive industry, new energy vehicles (NEVs) are increasingly prominent in the market. Compared to traditional vehicles, NEVs lack the background noise of the engine, providing a more comfortable experience for drivers and passengers. However, the noise and vibration of the air conditioning compressor are more noticeable to passengers. Currently, A00-class NEVs are attracting significant market attention. However, due to cost constraints, the NVH performance of the A / C compressor is often neglected during the OEM development phase. This results in the inability to effectively control the NVH performance of the vehicle's electric compressor, leading to customer complaints related to excessive noise and vibration from the compressor. Summary of the Invention

[0003] The present invention provides a method for adapting the NVH performance of a new energy vehicle air conditioner, aiming to improve the NVH performance of the new energy vehicle air conditioner.

[0004] The present invention is implemented as follows: a method for adapting the NVH performance of a new energy vehicle air conditioner, the method specifically comprising the following steps:

[0005] S1. Determine the minimum speed Rmin and the maximum speed Rmax of the compressor when it is in stable operation. The minimum speed Rmin and the maximum speed Rmax constitute the speed range I of the compressor.

[0006] S2. Obtaining the resonance point of the vibration acceleration of the target vibration component in the vehicle and the compressor;

[0007] S3. removing the compressor speed corresponding to the vibration acceleration resonance point within speed range I to form a compressor speed range II;

[0008] S4. When the vehicle air conditioner is in operation, the speed of the compressor is controlled to be in speed range II.

[0009] Furthermore, the method for obtaining the resonance point of the vibration acceleration is as follows:

[0010] Based on the set step size, the speed value is sampled within the speed range I of the compressor, the vibration acceleration value of the vibration target component and the compressor itself at each compressor speed value is obtained, the compressor speed-vibration acceleration curve of the vibration target component and the compressor is determined, and the speed value at which the vibration acceleration of the vibration target component is close to that of the compressor is obtained. The above speed value is the resonance point of the resonance acceleration of the vibration target component and the compressor.

[0011] Further, the vibration target component is a steering wheel and / or a seat.

[0012] Furthermore, the method further comprises the steps of:

[0013] S5. Obtain an audio resonance point between the vehicle interior noise and the compressor noise, and remove the compressor speed corresponding to the audio resonance point within speed range II to form speed range III. When the vehicle air conditioner is in operation, control the compressor speed to be within speed range III.

[0014] Furthermore, the method for determining the acoustic resonance point of the vehicle interior noise and the compressor noise is as follows:

[0015] Based on the set step size, the speed values ​​are sampled within the compressor speed range I to obtain the sound pressure levels of the vehicle interior noise and the compressor noise at each compressor speed value, determine the compressor speed-noise curves of the vehicle interior and the compressor, and obtain the speed value at which the vehicle interior noise and the compressor noise are coupled. The above speed value is the audio frequency resonance point of the vehicle interior noise and the compressor noise.

[0016] Furthermore, the compressor speed control method when the vehicle air conditioner is started is as follows:

[0017] Detect whether the compressor passes through the resonance zone during the process from startup to target speed. If the detection result is yes, increase the speed acceleration rate of the compressor. If the detection result is no, control the compressor to increase to the target speed value at the set speed rate.

[0018] Furthermore, the target speed is in speed range III or speed range II.

[0019] Furthermore, the compressor speed control method when the vehicle air conditioner is turned off is as follows:

[0020] Detect whether the compressor passes through the resonance zone during shutdown. If the detection result is yes, increase the deceleration rate of the compressor. If the detection result is no, control the compressor to decelerate to the shutdown speed at the set rate.

[0021] Furthermore, the resonance area is composed of a vibration acceleration resonance point sequence and / or an audio frequency resonance point sequence.

[0022] The present invention reduces the user's vibration sensation and in-vehicle noise by removing the compressor speed value corresponding to the vibration acceleration resonance point within speed range I and obtaining the speed value of the coupling between the in-vehicle noise and the compressor noise, thereby improving the NVH performance of the new energy vehicle air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of the NVH performance adaptation method for a new energy vehicle air conditioner provided by an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of a curve showing how the vibration acceleration of the steering wheel and seat changes with the speed of the compressor, provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further explained in detail below by describing the best embodiment with reference to the accompanying drawings.

[0026] Figure 1 A flow chart of the NVH performance adaptation method for a new energy vehicle air conditioner provided in an embodiment of the present invention, the method specifically includes the following steps:

[0027] S1. Determine the minimum speed Rmin and the maximum speed Rmax of the compressor when it is in stable operation. The minimum speed Rmin and the maximum speed Rmax constitute the speed range I of the compressor.

[0028] S2. Obtaining the resonance point of the vibration acceleration of the target vibration component in the vehicle and the compressor;

[0029] In an embodiment of the present invention, the vibration target component is a vehicle component that is easy for the user to feel vibration, such as a steering wheel and a seat. The method for obtaining the resonance point of the vibration acceleration is as follows:

[0030] Based on the set step size, the speed value is sampled within the speed range I of the compressor, the vibration acceleration value of the vibration target component and the compressor itself at each compressor speed value is obtained, the compressor speed-vibration acceleration curve of the vibration target component and the compressor is determined, and the speed value at which the vibration acceleration of the vibration target component is close to that of the compressor is obtained. The above speed value is the resonance point of the resonance acceleration of the vibration target component and the compressor.

[0031] S3. removing the compressor speed corresponding to the vibration acceleration resonance point within speed range I to form a compressor speed range II;

[0032] S4. When the vehicle air conditioner is in operation, the speed of the compressor is controlled to be in speed range II. When the compressor operates in speed range II, the vehicle vibration perceived by the user is greatly reduced.

[0033] In an embodiment of the present invention, the method further includes the steps of:

[0034] S4. Obtain the acoustic resonance point of the interior noise and the compressor noise, remove the compressor speed corresponding to the acoustic resonance point (i.e., the interior noise coupling peak) within speed range II, and form speed range III. When the vehicle air conditioner is in operation, control the compressor speed to be within speed range III, thereby greatly reducing the vehicle vibration and noise perceived by the user.

[0035] In an embodiment of the present invention, a method for determining the acoustic resonance point of the vehicle interior noise and the compressor noise is specifically as follows:

[0036] Based on the set step size, the speed values ​​are sampled within the compressor speed range I to obtain the sound pressure levels of the vehicle interior noise and the compressor noise at each compressor speed value, determine the compressor speed-noise curves of the vehicle interior and the compressor, and obtain the speed value at which the vehicle interior noise and the compressor noise are coupled. The above speed value is the audio frequency resonance point of the vehicle interior noise and the compressor noise.

[0037] In an embodiment of the present invention, the method for controlling the compressor speed when the vehicle air conditioner is started is as follows:

[0038] Detect whether the compressor passes through the resonance zone from startup to target speed. If the detection result is yes, increase the speed acceleration rate of the compressor so that the compressor passes through the resonance zone at a faster speed. If the detection result is no, control the compressor to increase to the target speed value at the set speed rate.

[0039] The target speed of the compressor is determined based on the steady temperature difference between the set target temperature and the ambient temperature. The target speed is located in speed range III or speed range II. The resonance zone here is composed of a resonance point sequence of vibration acceleration and / or an audio resonance point sequence.

[0040] In an embodiment of the present invention, the method for controlling the compressor speed when the vehicle air conditioner is turned off is as follows:

[0041] Detect whether the compressor passes through the resonance zone during shutdown. If the detection result is yes, increase the deceleration rate of the compressor. If the detection result is no, control the compressor to decelerate to the shutdown speed at the set rate.

[0042] Assuming the theoretical operating speed range of the compressor, based on the vehicle's refrigeration requirements and the normal working requirements of the compressor, the lowest stable operating speed of the compressor, Rmin, is preliminarily determined to be 1000 r / min, and the highest stable speed, Rmax, is 4000 r / min.

[0043] Compressor speed sweep: The blower is set to the lowest gear, and the cooling fan is fixed according to the pipeline pressure and controlled by software. The cooling fan is required to work continuously. Under this condition, the air conditioning compressor is controlled by software to increase from 1000 rpm to the maximum compressor speed of 4000 rpm, with an interval speed of 100 rpm. The compressor speed value of each 100 rpm interval between 1000 rpm and 4000 rpm is collected. The curve of the change of steering wheel vibration acceleration with compressor speed and the curve of the change of seat rail vibration acceleration with compressor speed are shown as follows. Figure 2As shown, the curve of the compressor vibration acceleration changing with its own speed, the curve of the noise pressure level in the car changing with the compressor speed, and the curve of the noise pressure level of the compressor changing with its own speed.

[0044] Obtain the speed values ​​at which the steering wheel vibration acceleration is close to the compressor vibration acceleration, and the speed values ​​at which the seat vibration acceleration is close to the compressor vibration acceleration. These speed values ​​are removed from the compressor speed range I to form speed range II, thereby avoiding resonance between the compressor and the steering wheel and seat, and reducing the user's vibration sensation.

[0045] Obtain the speed value where the interior noise and compressor noise are coupled, remove the speed value from speed range II, and form speed range III to avoid noise resonance between the compressor and the entire vehicle, thereby reducing the noise inside the vehicle.

[0046] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A method for adapting the NVH performance of a new energy vehicle air conditioner, characterized in that: The method specifically comprises the following steps: S1. Determine the minimum speed Rmin and the maximum speed Rmax of the compressor when it is in stable operation. The minimum speed Rmin and the maximum speed Rmax constitute the speed range I of the compressor. S2. Obtaining the resonance point of the vibration acceleration of the target vibration component in the vehicle and the compressor; S3. removing the compressor speed corresponding to the vibration acceleration resonance point within speed range I to form a compressor speed range II; S4. When the vehicle air conditioner is in operation, the speed of the compressor is controlled to be in speed range II; The method for obtaining the resonance point of vibration acceleration is as follows: Based on the set step size, the speed value is sampled within the speed range I of the compressor, the vibration acceleration value of the vibration target component and the compressor itself at each compressor speed value is obtained, the compressor speed-vibration acceleration curve of the vibration target component and the compressor is determined, and the speed value at which the vibration acceleration of the vibration target component is close to that of the compressor is obtained. The above speed value is the resonance point of the resonance acceleration of the vibration target component and the compressor.

2. The NVH performance adaptation method of the new energy vehicle air conditioner according to claim 1, characterized in that: The target components of the vibration are the steering wheel and / or the seat.

3. The NVH performance adaptation method of the new energy vehicle air conditioner according to claim 1, characterized in that: The method further comprises the steps of: S5. Obtain an audio resonance point between the vehicle interior noise and the compressor noise, and remove the compressor speed corresponding to the audio resonance point within speed range II to form speed range III. When the vehicle air conditioner is in operation, control the compressor speed to be within speed range III.

4. The NVH performance adaptation method of the new energy vehicle air conditioner as claimed in claim 3, characterized in that: The method for determining the acoustic resonance point of the interior noise and the compressor noise is as follows: Based on the set step size, the speed values ​​are sampled within the compressor speed range I to obtain the sound pressure levels of the vehicle interior noise and the compressor noise at each compressor speed value, determine the compressor speed-noise curves of the vehicle interior and the compressor, and obtain the speed value at which the vehicle interior noise and the compressor noise are coupled. The above speed value is the audio frequency resonance point of the vehicle interior noise and the compressor noise.

5. The NVH performance adaptation method of the new energy vehicle air conditioner according to claim 1, characterized in that: The specific method for controlling the compressor speed when the vehicle air conditioner is started is as follows: Detect whether the compressor passes through the resonance zone during the process from startup to target speed. If the detection result is yes, increase the acceleration rate of the compressor speed. If the detection result is no, control the compressor to increase to the target speed value at the set speed rate.

6. The NVH performance adaptation method of the new energy vehicle air conditioner according to claim 5, characterized in that: The target speed is in speed range III or speed range II.

7. The NVH performance adaptation method of the new energy vehicle air conditioner according to claim 1, characterized in that: The specific method for controlling the compressor speed when the vehicle air conditioner is turned off is as follows: Detect whether the compressor passes through the resonance zone during shutdown. If the detection result is yes, increase the deceleration rate of the compressor. If the detection result is no, control the compressor to decelerate to the shutdown speed at the set rate.

8. The NVH performance adaptation method of the new energy vehicle air conditioner according to claim 5 or 7, characterized in that: The resonance zone is composed of a vibration acceleration resonance point sequence and / or an audio frequency resonance point sequence.

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