System and method for improving road noise roar caused by ceiling mode

Abstract

The invention discloses a system and method for improving road noise roars caused by ceiling modalities, and the method comprises the steps: detecting the vibration acceleration and the wheel center acceleration of a vehicle ceiling in real time in the vehicle driving process, and controlling an excitation module to start to apply periodic excitation force to the ceiling when the vibration acceleration and the wheel center acceleration are judged to meet excitation conditions, so as to improve the road noise roars caused by the ceiling modalities. And the roar generated by resonance of the ceiling excited by the road surface is counteracted. The acceleration sensor and the vibration exciter are arranged on the vehicle ceiling, the ceiling acceleration and the wheel center acceleration are detected, and when the center of the ceiling is excited by the road surface to generate resonance, namely the ceiling acceleration and the wheel center acceleration both exceed threshold values, the vibration exciter is controlled to apply periodic exciting force to the center of the ceiling; the method actively stimulates the local mode of the ceiling to counteract or reduce the deformation of the ceiling, thereby achieving the purpose of improving or eliminating the roar of the road surface, and has the advantages of being simple, convenient to implement and low in cost.

Description

Technical Field

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

[0002] Road noise (abbreviated as road noise) refers to the noise generated by the friction between tires and the road surface, air flow, and vehicle structure vibration during driving. These noises are mainly transmitted into the vehicle through doors, trunks, front fenders, ceilings and other parts, affecting driving comfort.

[0003] Currently, road noise is generally improved by improving the body structure or sticking damping plates on the chassis, sticking reinforcing plates on the side panels of the body roof, etc., but the method of improving the 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 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 solve 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 ceiling mode, comprising:

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

[0007] The second acceleration detection module is used to detect the wheel center acceleration;

[0008] A control module is used to determine whether the excitation conditions are met according to 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 start applying 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 cross beam 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 roar caused by ceiling mode. During vehicle driving, the vibration acceleration of the vehicle roof and the wheel center acceleration are detected in real time. When it is determined that the excitation conditions are met based on the vibration acceleration and the wheel center acceleration, the excitation module is controlled to start applying periodic excitation force to the ceiling to offset the roar caused by the resonance of the ceiling excited by the road surface.

[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, and the first set time 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 the third set acceleration and lasts for a second set time, the excitation module is controlled to stop working, and the second set time is 1-3s.

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

[0026] The present invention arranges acceleration sensors and exciters on the roof of the vehicle to detect the acceleration of the roof and the acceleration of the wheel center. 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 at 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, good improvement effect and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 It is a schematic diagram of installing 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 specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but 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 can 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 roar caused by ceiling mode, comprising:

[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 condition is met according to the vibration acceleration and the wheel center acceleration, and if so, sends an excitation signal to the excitation module;

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

[0036] The present invention arranges acceleration sensors and exciters on the vehicle roof to detect 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 detected by it 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 scheme, the function of the second acceleration detection module 2 can be realized in the vehicle controller, which can be calculated by obtaining the acceleration of the four tires according to the corresponding relationship, and the calculation method is the existing conventional method. The wheel center acceleration reflects the flatness of the road surface when the vehicle is driving. When its value is small, it means that the road surface is flat; when its value is large, it means that the road surface is bumpy or pothole-prone.

[0039] In the above scheme, the excitation module 4 is an exciter installed in the middle of the middle cross beam 6 of the vehicle roof 5. When there is only one middle cross beam 6, the excitation module is installed in the middle of the middle cross beam; when there are two middle cross beams, the excitation module is installed in the middle of one of the middle cross beams. 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, the linear relationship can be calibrated in advance, so when the vibration acceleration is detected, the magnitude of the excitation force applied by the excitation module can be obtained. During calibration, the acceleration time curve collected at the first acceleration detection module under the unit excitation force of the exciter (such as 1N) can be collected to obtain a linear proportional relationship. The direction of the excitation force is generally perpendicular to the ceiling upward. Therefore, 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 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 scheme, 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, indicating that the vehicle has now traveled to a flat road surface, and the resonance generated in the vehicle by the vibration of the roof has been reduced to an acceptable range, and the roaring sound is not subjectively felt. The third set acceleration is less than the second set acceleration, and the second set time is 1-3s, preferably 1s or 2s.

[0042] The present invention also provides a method for improving the road noise roar caused by the ceiling mode, such as Figure 3 As shown, during the driving process of the vehicle, the vibration acceleration of the vehicle roof and the wheel center acceleration are detected in real time. When it is determined that the excitation conditions are 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 beam of the vehicle ceiling. The vehicle ceiling may include one or two middle beams. When there is only one middle beam, the first acceleration detection module is installed on one side of the middle beam and close to the middle beam; when there are two middle beams, the first acceleration detection module is installed in the middle of the two middle beams, that is, the center of the ceiling between the two middle beams. The first acceleration detection module is an acceleration sensor, and the vibration acceleration value detected by it 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 scheme, the wheel center acceleration is detected by the second acceleration detection module. The function of the second acceleration detection module can be realized in the vehicle controller. It can be calculated by obtaining the acceleration of the four tires according to the corresponding relationship. This calculation method is an existing conventional method. The wheel center acceleration reflects the flatness of the road surface when the vehicle is driving. When its value is small, it means that the road surface is flat; when its value is large, it means that the road surface is bumpy or pothole-prone.

[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 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, the 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. Therefore, 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 scheme, 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, indicating that the vehicle has now traveled to a flat road surface, and the resonance generated in the vehicle by the vibration of the roof has been reduced to an acceptable range, and the roaring sound is not subjectively felt. The third set acceleration is less than the second set acceleration, and the second set time is 1-3s, preferably 1s or 2s.

[0048] Workflow:

[0049] Calibration: Collect the acceleration-time curve collected at sensor 1 under the unit excitation force (1N) of exciter 2.

[0050] When the roof resonates due to road excitation, the value collected by the acceleration sensor 1 is fed back to the control system, and the control system converts and synchronously outputs an exciting force of the same magnitude and opposite direction to the exciter 2.

[0051] When the roof is stimulated by the road surface and resonates, the controller receives a signal from the acceleration sensor 1 that exceeds the threshold.

[0052] Those skilled in the art may also understand that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention may be implemented by electronic hardware, computer software, or a combination of the two. In order 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, a discrete gate or transistor logic, a discrete hardware component, or any combination of the above. 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 protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A system for improving road noise caused by ceiling mode, characterized in that: include A first acceleration detection module, used to detect the vibration acceleration of the vehicle roof; The second acceleration detection module is used to detect the wheel center acceleration; A control module is used to determine whether the excitation conditions are met according to 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 start applying 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 caused by ceiling mode according to claim 1, characterized in that: The first acceleration detection module is installed on one side of the middle cross beam of the vehicle roof.

3. The system for improving road noise 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 ceiling 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 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 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, and the excitation module stops applying the excitation force after receiving the stop signal.

7. A method for improving road noise caused by ceiling mode, characterized in that: 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 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.

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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