A system and method for improving road noise caused by roof mode

Abstract

The present invention discloses a system and method for improving road noise boom caused by roof modalities. During vehicle driving, the vibration acceleration and wheel center acceleration of the vehicle roof are detected in real time. When the excitation conditions are determined to be met based on the vibration acceleration and wheel center acceleration, the excitation module is controlled to start applying a periodic excitation force to the roof to offset the boom caused by the road surface exciting the roof resonance. The present invention arranges an acceleration sensor and an exciter on the vehicle roof to detect the roof acceleration and wheel center acceleration. When the center of the roof is excited by the road surface to produce resonance, that is, when the roof acceleration and wheel center acceleration both exceed the threshold, the exciter is controlled to apply a periodic excitation force to the center of the roof, actively exciting the local mode of the roof to offset or reduce the deformation of the roof, thereby achieving the purpose of improving or eliminating the road roar. The method has the advantages of simplicity, easy implementation, and low cost.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and particularly relates to a system and method for improving road noise roar caused by roof mode. Background Art

[0002] Road noise (abbreviated as road noise) refers to the noise generated by tire-road friction, air flow, and vehicle structural vibration during driving. This noise is primarily transmitted into the vehicle cabin through the doors, trunk, front fenders, and roof, affecting driving comfort.

[0003] Currently, road noise is generally improved by improving the vehicle body structure or sticking damping plates on the chassis, sticking reinforcing plates on the roof and side panels of the vehicle body. However, the method of improving the vehicle body structure is relatively costly. After all, to change the frequency at such a low frequency, it is necessary to make large-scale changes to the vehicle body structure, and the cost of improvement is very high. The method of sticking damping plates or reinforcing plates will lose its effect after long-term friction, and the improvement of road noise is very limited. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology and to provide a system and method for improving road noise roar caused by ceiling mode.

[0005] The technical solution adopted by the present invention is: a system for improving road noise caused by roof mode, comprising

[0006] A first acceleration detection module, configured to detect vibration acceleration of a vehicle roof;

[0007] A second acceleration detection module, used to detect wheel center acceleration;

[0008] The control module is used to determine whether the excitation conditions are met based on the vibration acceleration and the wheel center acceleration, and if so, send an excitation signal to the excitation module;

[0009] The excitation module is used to apply periodic excitation force to the roof after receiving the excitation signal, so as to offset the roaring sound caused by the resonance of the roof excited by the road surface.

[0010] Furthermore, the first acceleration detection module is installed on one side of the middle crossbeam of the vehicle roof.

[0011] Furthermore, the excitation module is installed in the middle of the middle cross beam of the vehicle roof.

[0012] Furthermore, when the following conditions are met at the same time, it is determined that the excitation condition is met:

[0013] ①. The vibration acceleration is greater than the first set acceleration;

[0014] ② The wheel center acceleration is greater than the second set acceleration;

[0015] ③. The duration is greater than the first set time.

[0016] Furthermore, the excitation force applied by the excitation module is perpendicular to the ceiling and upward, and the moment of applying the excitation force is the moment when the direction of the vibration acceleration detected by the first acceleration detection module is perpendicular to the ceiling and downward.

[0017] Furthermore, after the excitation module applies the excitation force, if the control module determines that the wheel center acceleration is less than the third set acceleration and lasts for the second set time, a stop signal is sent to the excitation module, and the excitation module stops applying the excitation force after receiving the stop signal.

[0018] A method for improving road noise boom caused by roof modalities. During vehicle driving, the vibration acceleration of the vehicle roof and the wheel center acceleration are detected in real time. When the excitation conditions are determined to be met based on the vibration acceleration and wheel center acceleration, the excitation module is controlled to start applying a periodic excitation force to the roof to offset the boom caused by the road surface excitation of the roof resonance.

[0019] Furthermore, when the following conditions are met at the same time, it is determined that the excitation condition is met:

[0020] ①. The vibration acceleration is greater than the first set acceleration;

[0021] ② The wheel center acceleration is greater than the second set acceleration;

[0022] ③. The duration is greater than the first set time, which is 0.5-2s.

[0023] Furthermore, the excitation force applied by the excitation module is perpendicular to the ceiling and upward, and the moment of applying the excitation force is the moment when the direction of the vibration acceleration detected by the first acceleration detection module is perpendicular to the ceiling and downward.

[0024] Furthermore, after the excitation module applies the excitation force, if it is detected that the wheel center acceleration is less than a third set acceleration and lasts for a second set time, the excitation module is controlled to stop working, and the second set time is 1-3 seconds.

[0025] The beneficial effects of the present invention are:

[0026] The present invention arranges an acceleration sensor and an exciter on the vehicle roof to detect the roof acceleration and the wheel center acceleration. When the center of the roof is excited by the road surface to produce resonance, that is, when both the roof acceleration and the wheel center acceleration exceed the threshold value, the exciter is controlled to apply a periodic excitation force to the center of the roof, actively exciting the local mode of the roof to offset or reduce the deformation of the roof, thereby achieving the purpose of improving or eliminating the road roar sound. This method has the advantages of simplicity, easy implementation, good improvement effect and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a system principle diagram of the present invention.

[0028] Figure 2 This is a schematic diagram of the installation of the first acceleration detection module and the excitation module on the ceiling of the present invention.

[0029] Figure 3 Flow chart of the method of the present invention DETAILED DESCRIPTION

[0030] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1 、 Figure 2 As shown, the present invention provides a system for improving road noise caused by roof mode, including

[0032] The first acceleration detection module 1 is used to detect the vibration acceleration of the vehicle roof;

[0033] The second acceleration detection module 2 is used to detect the wheel center acceleration;

[0034] The control module 3 may be a vehicle control module, which is used to determine whether the excitation conditions are met based on the vibration acceleration and the wheel center acceleration, and if so, send an excitation signal to the excitation module;

[0035] The excitation module 4 is used to start applying a periodic excitation force to the roof after receiving the excitation signal, so as to offset the roaring sound caused by the resonance of the roof excited by the road surface.

[0036] The present invention arranges an acceleration sensor and an exciter on the vehicle roof to detect the roof acceleration and wheel center acceleration. When the center of the roof is excited by the road surface to produce resonance and meet the excitation conditions, the control module controls the exciter to apply a periodic excitation force to the center of the roof, actively exciting the local mode of the roof to offset or reduce the deformation of the roof, thereby achieving the purpose of improving or eliminating the road roar.

[0037] In the above scheme, the first acceleration detection module 1 is installed on one side of the middle crossbeam 6 of the vehicle roof 5. The middle crossbeam 6 of the vehicle roof 5 may include one or two. When there is only one middle crossbeam, the first acceleration detection module is installed on one side of the middle crossbeam and close to the middle crossbeam; when there are two middle crossbeams, the first acceleration detection module is installed in the middle between the two middle crossbeams, that is, the center of the ceiling between the two middle crossbeams. The first acceleration detection module is an acceleration sensor, and the vibration acceleration value it detects includes vibration amplitude, direction and frequency. The amplitude corresponds to the vibration size, and the direction is perpendicular to the direction of the ceiling, vertically upward or downward. The vibration acceleration reflects the noise of the ceiling resonance in the car, so when the value is large, the resonance needs to be eliminated.

[0038] In the above solution, the second acceleration detection module 2 can be implemented within the vehicle controller. It can be calculated by acquiring the accelerations of the four tires and using a corresponding relationship. This calculation method is conventional. Wheel center acceleration reflects the smoothness of the road surface on which the vehicle is traveling. A low value indicates a flat surface; a high value indicates a bumpy or potholed surface.

[0039] In the above scheme, the excitation module 4 is a vibrator installed in the middle of the middle crossbeam 6 of the vehicle roof 5. When there is only one middle crossbeam 6, the excitation module is installed in the middle of the middle crossbeam; when there are two middle crossbeams, the excitation module is installed in the middle of one of the middle crossbeams. The magnitude, direction, and period of the excitation force emitted by the excitation module are all related to the corresponding value of the vibration acceleration detected by the first acceleration detector. If the relationship between the magnitude of the excitation force and the vibration amplitude is a linear relationship with a fixed ratio, this linear relationship can be calibrated in advance. Therefore, when the vibration acceleration is detected, the magnitude of the excitation force applied by the excitation module can be determined. During calibration, the acceleration-time curve collected by the first acceleration detection module under a unit excitation force (e.g., 1N) of the exciter can be collected to obtain a linear proportional relationship. The direction of the excitation force is generally perpendicular to the roof and upward. Therefore, in order to offset the resonance generated by the roof, the excitation module should apply the excitation force at the moment when the direction of the vibration acceleration detected by the first acceleration detection module is perpendicular to the roof and downward. In this way, the excitation force can offset the resonant force of the roof. The period of the exciting force corresponds to the frequency of the vibration acceleration.

[0040] In the above scheme, when the following conditions are met at the same time, the control module determines that the excitation conditions are met: ①, the vibration acceleration is greater than the first set acceleration; ②, the wheel center acceleration is greater than the second set acceleration; ③, the duration of conditions ① and ② is greater than the first set time, and the first set time is 0.5-2s, preferably 0.5s or 1s.

[0041] In the above solution, after the excitation module applies the excitation force, if the control module determines that the wheel center acceleration is less than a third set acceleration and persists for a second set time, it sends a stop signal to the excitation module. Upon receiving the stop signal, the excitation module ceases applying the excitation force, indicating that the vehicle has reached a flat surface and the resonance caused by the roof vibration within the vehicle has been reduced to an acceptable range, making the booming sound subjectively imperceptible. The third set acceleration is less than the second set acceleration, and the second set time is 1-3 seconds, preferably 1 second or 2 seconds.

[0042] The present invention also provides a method for improving the road noise roar caused by the roof mode, such as Figure 3 As shown, during vehicle driving, the vibration acceleration of the vehicle roof and the wheel center acceleration are detected in real time. When the excitation conditions are determined to be met based on the vibration acceleration and the wheel center acceleration, the excitation module is controlled to start applying periodic excitation force to the roof to offset the roaring sound caused by the resonance of the roof excited by the road surface.

[0043] In the above scheme, the vibration acceleration of the ceiling is detected by the first acceleration detection module, and the first acceleration detection module is installed on one side of the middle crossbeam of the vehicle roof. The vehicle roof may include one or two middle crossbeams. When there is only one middle crossbeam, the first acceleration detection module is installed on one side of the middle crossbeam and close to the middle crossbeam; when there are two middle crossbeams, the first acceleration detection module is installed in the middle of the two middle crossbeams, that is, the center of the ceiling between the two middle crossbeams. The first acceleration detection module is an acceleration sensor, and the vibration acceleration value it detects includes vibration amplitude, direction and frequency. The amplitude corresponds to the vibration size, and the direction is perpendicular to the direction of the ceiling, vertically upward or downward. The vibration acceleration reflects the noise of the ceiling resonance in the car, so when the value is large, the resonance needs to be eliminated.

[0044] In the above solution, wheel center acceleration is detected by a second acceleration detection module. This module's functionality can be implemented within the vehicle controller. It is calculated by obtaining the accelerations of the four tires and using a corresponding relationship. This calculation method is conventional. Wheel center acceleration reflects the smoothness of the road surface on which the vehicle is traveling. A low value indicates a flat surface; a high value indicates a bumpy or potholed surface.

[0045] In the above scheme, the excitation module is installed in the middle of the middle crossbeam of the vehicle roof. When there is only one middle crossbeam, the excitation module is installed in the middle of the middle crossbeam; when there are two middle crossbeams, the excitation module is installed in the middle of one of the middle crossbeams. The magnitude, direction and period of the excitation force emitted by the excitation module are all related to the corresponding value of the vibration acceleration collected by the first acceleration. If the relationship between the magnitude of the excitation force and the vibration amplitude is a linear relationship with a fixed ratio, this linear relationship can be tested in advance, so when the vibration acceleration is detected, the magnitude of the excitation force applied by the excitation module can be obtained. The direction of the excitation force is generally perpendicular to the ceiling upward, so in order to offset the resonance generated by the ceiling, the moment when the excitation module applies the excitation force should be the moment when the direction of the vibration acceleration detected by the first acceleration detection module is perpendicular to the ceiling downward, so that the excitation force can offset the resonance force of the ceiling. The period of the excitation force corresponds to the frequency of the vibration acceleration.

[0046] In the above scheme, when the following conditions are met at the same time, the control module determines that the excitation conditions are met: ①, the vibration acceleration is greater than the first set acceleration; ②, the wheel center acceleration is greater than the second set acceleration; ③, the duration of conditions ① and ② is greater than the first set time, and the first set time is 0.5-2s, preferably 0.5s or 1s.

[0047] In the above solution, after the excitation module applies the excitation force, if the control module determines that the wheel center acceleration is less than a third set acceleration and persists for a second set time, it sends a stop signal to the excitation module. Upon receiving the stop signal, the excitation module ceases applying the excitation force, indicating that the vehicle has reached a flat surface and the resonance caused by the roof vibration within the vehicle has been reduced to an acceptable range, making the booming sound subjectively imperceptible. The third set acceleration is less than the second set acceleration, and the second set time is 1-3 seconds, preferably 1 second or 2 seconds.

[0048] Workflow:

[0049] Calibration: Collect the acceleration-time curve collected at the sensor under the unit excitation force of the exciter (1N).

[0050] When the roof resonates due to road excitation, the values ​​collected by the acceleration sensor are fed back to the control system, which converts the values ​​and outputs the same excitation force of the same magnitude and opposite direction to the exciter.

[0051] When the roof is stimulated by the road surface and resonates, the controller receives a signal from the acceleration sensor that exceeds the threshold.

[0052] Those skilled in the art will also appreciate that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of the two. To clearly demonstrate the interchangeability of hardware and software, the various illustrative components, units, and steps described above have generally described their functions. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present invention.

[0053] The various illustrative logic blocks or units described in the embodiments of the present invention can be implemented or operated by a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0054] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention. Matters not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A system for improving road noise and boom caused by roof mode, characterized by: include A first acceleration detection module, configured to detect vibration acceleration of a vehicle roof; A second acceleration detection module, used to detect wheel center acceleration; The control module is used to determine whether the excitation conditions are met based on the vibration acceleration and the wheel center acceleration, and if so, send an excitation signal to the excitation module; The excitation module is used to apply periodic excitation force to the roof after receiving the excitation signal, so as to offset the roaring sound caused by the resonance of the roof excited by the road surface.

2. The system for improving road noise and roar caused by ceiling mode according to claim 1, characterized in that: The first acceleration detection module is installed on one side of the middle crossbeam of the vehicle roof.

3. The system for improving road noise and roar caused by ceiling mode according to claim 1, characterized in that: The excitation module is installed in the middle of the middle cross beam of the vehicle roof.

4. The system for improving road noise caused by roof mode according to claim 1, characterized in that: When the following conditions are met at the same time, the excitation condition is determined to be met: ①. The vibration acceleration is greater than the first set acceleration; ② The wheel center acceleration is greater than the second set acceleration; ③. The duration is greater than the first set time.

5. The system for improving road noise and boom caused by ceiling mode according to claim 1, characterized in that: The excitation force applied by the excitation module is perpendicular to the ceiling and upward, and the moment of applying the excitation force is the moment when the direction of the vibration acceleration detected by the first acceleration detection module is perpendicular to the ceiling and downward.

6. The system for improving road noise and boom caused by ceiling mode according to claim 1, characterized in that: After the excitation module applies the excitation force, if the control module determines that the wheel center acceleration is less than the third set acceleration and lasts for the second set time, a stop signal is sent to the excitation module. After receiving the stop signal, the excitation module stops applying the excitation force.

7. A method for improving road noise boom caused by ceiling mode, characterized by: During vehicle driving, the vibration acceleration of the vehicle roof and the wheel center acceleration are detected in real time. When the excitation conditions are determined to be met based on the vibration acceleration and wheel center acceleration, the excitation module is controlled to start applying periodic excitation force to the roof to offset the roaring sound caused by the road surface exciting the roof resonance.

8. The method for improving road noise boom caused by ceiling mode according to claim 7, characterized in that: When the following conditions are met at the same time, the excitation condition is determined to be met: ①. The vibration acceleration is greater than the first set acceleration; ② The wheel center acceleration is greater than the second set acceleration; ③. The duration is greater than the first set time.

9. The method for improving road noise boom caused by ceiling mode according to claim 7, characterized in that: The excitation force applied by the excitation module is perpendicular to the ceiling and upward, and the moment of applying the excitation force is the moment when the direction of the vibration acceleration detected by the first acceleration detection module is perpendicular to the ceiling and downward.

10. The method for improving road noise boom caused by ceiling mode according to claim 7, characterized in that: After the excitation module applies the excitation force, if it is detected that the wheel center acceleration is less than the third set acceleration and lasts for the second set time, the excitation module is controlled to stop working.

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