Back door lock device, drum knocking sound control method and automobile

Abstract

The present invention relates to a back door lock device, a drumming sound control method and a car. The back door lock device comprises: a vibration sensor, which is arranged on the back door of the car, and the vibration sensor is used to obtain vibration information of the back door; a back door lock body, which is installed on the back door, and the back door lock body has a locked state; a back door lock, which comprises a lock body for installation on the car body and a lock ring slidably connected to the lock body; a driving component, which is connected to the lock ring, and when the back door lock body is in the locked state, the lock ring is locked on the back door lock body, and the driving component is used to drive the lock ring to slide according to the vibration information, so that the lock ring drives the back door to resist the rigid body modal vibration caused by road excitation. In the embodiment of the present invention, the driving component controls the movement of the lock ring according to different vibration conditions of the back door, and compared with the rubber vibration reduction layer with a fixed structure, the control effect of the road noise drumming sound is better.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a back door latch device, a drumming sound control method and an automobile. Background Art

[0002] When the car is driving, the road excitation is transmitted to the car body through the tire / suspension system and causes the tailgate to vibrate. The rigid body modal vibration of the tailgate is coupled with the acoustic cavity mode of the passenger compartment, squeezing the acoustic cavity to produce volume sound pressure fluctuations, resulting in low-frequency drumming problems in the car.

[0003] At present, a bushing and a rubber vibration-damping layer are provided in the lock bottom plate of the tailgate lock, so that a vibration-damping function is provided between the lock and the vehicle body. When the lock is subjected to force and vibrates, the rubber vibration-damping layer absorbs the vibration energy, avoiding direct collision between the lock and the vehicle body sheet metal and the bushing, reducing the abnormal noise generated by the lock when opening and closing the door and driving the car, thereby reducing the noise transmitted to the interior of the vehicle body.

[0004] However, the structure of the rubber vibration damping layer is fixed, and the effect of absorbing vibration energy is also fixed. Under the excitation conditions of complex and rough road surfaces, the control effect of road noise and drumming is poor, and may even fail. Summary of the invention

[0005] One of the purposes of the present invention is to provide a tailgate lock device to solve the technical problem of poor control effect of road noise drum sound in the prior art; the second purpose is to provide a drum sound control method; the third purpose is to provide a car.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A back door lock device, comprising:

[0008] A vibration sensor is arranged on the back door of the car, and is used to obtain vibration information of the back door;

[0009] A back door lock body, mounted on the back door, the back door lock body being in a locked state;

[0010] A back door lock, comprising a lock body for mounting on a vehicle body and a lock ring slidably connected to the lock body;

[0011] A driving component is connected to the locking ring. When the tailgate lock body is in a locked state, the locking ring is locked on the tailgate lock body. The driving component is used to drive the locking ring to slide according to the vibration information, so that the locking ring drives the tailgate to resist the rigid body modal vibration caused by road excitation.

[0012] According to the above technical means, the vibration information of the tailgate vibration is obtained through the vibration sensor and fed back to the driving component, and the driving component drives the lock ring to slide according to the vibration information, so that the lock ring drives the tailgate to resist the rigid body modal vibration caused by road excitation, so that the tailgate tends to be stationary relative to the vehicle body, thereby achieving the suppression of road noise knocking sound; in addition, the driving component controls the movement of the lock ring according to the different vibration conditions of the tailgate, that is, the more intense the vibration condition of the tailgate, the more intense the movement of the lock ring, and the control effect of the road noise knocking sound is better than that of the rubber vibration damping layer with a fixed structure; in addition, by setting a vibration sensor on the tailgate, the vibration of the tailgate can be identified more accurately and directly, thereby improving the accuracy of the control of the road noise knocking sound; in addition, in the embodiment of the present invention, it is only necessary to add a vibration sensor to the tailgate and modify the structure of the tailgate lock buckle, which is suitable for various types of cars and has good versatility.

[0013] Furthermore, the driving component includes a control unit electrically connected to the vibration sensor and a driving motor electrically connected to the control unit, the tailgate lock includes a moving component connected to the driving motor, the driving motor is connected to the lock ring through the moving component, and the control unit is used to output a regulating current to the driving motor according to the vibration information so that the driving motor drives the lock ring to slide through the moving component.

[0014] According to the above technical means, the output of the regulated current can be achieved through the setting of the control unit, so that the control unit controls the drive motor to drive the lock ring to slide through the moving component.

[0015] Furthermore, the moving component includes a gear and a sliding base plate, the driving motor is connected to the gear, the locking ring is connected to the sliding base plate, the sliding base plate is slidably connected to the lock body, the sliding base plate includes a main body and a plurality of teeth arranged at the bottom of the main body, the teeth are meshed with the gear, and the driving motor is used to drive the gear to rotate so that the gear drives the sliding base plate to slide.

[0016] According to the above technical means, through the arrangement of gears and the sliding base plate, the rotational motion of the driving motor can be converted into the linear sliding motion of the sliding base plate, thereby realizing the sliding drive of the locking ring connected to the sliding base plate.

[0017] Furthermore, the length direction of the automobile is taken as a first direction, the sliding direction of the sliding bottom plate is consistent with the first direction, and the plurality of teeth are distributed at intervals along the first direction.

[0018] According to the above technical means, the rigid body modal vibration of the tailgate caused by road excitation is mainly concentrated in the front and rear directions. By setting the sliding direction of the sliding bottom plate to be consistent with the first direction, the locking ring can slide back and forth along the first direction, thereby improving the effect of suppressing road noise knocking.

[0019] Furthermore, a bottom plate slide rail is provided on the lock body, a slide groove penetrating along the first direction is opened on the bottom plate slide rail, and the sliding bottom plate is slidably connected in the slide groove.

[0020] According to the above technical means, by setting the bottom plate slide rail, the sliding bottom plate is slidably connected to the lock body, and the bottom plate slide rail can ensure the smooth sliding of the sliding bottom plate.

[0021] Furthermore, the cross section of the slide groove is trapezoidal, and along the second direction, the width of the opening of the slide groove is smaller than the width of the bottom of the slide groove, wherein the second direction is perpendicular to the first direction.

[0022] According to the above technical means, the sliding bottom plate can only slide along the first direction, thereby preventing the sliding bottom plate from falling out of the sliding groove along the height direction of the car.

[0023] Furthermore, the locking ring is riveted on the sliding base plate.

[0024] According to the above technical means, the riveting connection method can ensure the connection performance between the locking ring and the sliding base plate.

[0025] A drum-knocking sound control method is applied to any of the above-mentioned tailgate lock devices, and the drum-knocking sound control method comprises:

[0026] Get the vehicle status information and back door lock status information;

[0027] When the vehicle status information is a driving status and the tailgate lock body status information is a locked status, the driving component drives the lock ring to slide according to the vibration information obtained by the vibration sensor, so that the lock ring drives the tailgate to resist the rigid body modal vibration caused by road excitation.

[0028] According to the above technical means, the vibration information of the tailgate vibration is obtained through the vibration sensor and fed back to the driving component, and the driving component drives the lock ring to slide according to the vibration information, so that the lock ring drives the tailgate to resist the rigid body modal vibration caused by road excitation, so that the tailgate tends to be stationary relative to the vehicle body, thereby achieving the suppression of road noise knocking sound; in addition, the driving component controls the movement of the lock ring according to the different vibration conditions of the tailgate, that is, the more intense the vibration of the tailgate, the more intense the movement of the lock ring, and the control effect of the road noise knocking sound is better than that of the rubber vibration-damping layer with a fixed structure; in addition, by setting a vibration sensor on the tailgate, the vibration of the tailgate can be identified more accurately and directly, thereby improving the accuracy of the control of the road noise knocking sound; in addition, in the embodiment of the present invention, it is only necessary to add a vibration sensor to the tailgate and modify the structure of the tailgate lock buckle, which is suitable for various types of cars and has good versatility.

[0029] Further, the driving assembly includes a control unit electrically connected to the vibration sensor and a driving motor electrically connected to the control unit, and the back door lock includes a moving component connected to the driving motor;

[0030] The driving component drives the lock ring to slide according to the vibration information obtained by the vibration sensor, including:

[0031] The control unit outputs a regulating current to the drive motor according to the vibration information, so that the drive motor drives the lock ring to slide through the moving component.

[0032] According to the above technical means, the output of the regulated current can be achieved through the setting of the control unit, so that the control unit controls the drive motor to drive the lock ring to slide through the moving component.

[0033] Further, the control unit outputs a regulating current according to the vibration information, including:

[0034] The control unit outputs the control current according to the vibration information and the corresponding relationship between the control current and the vibration information, wherein the corresponding relationship between the vibration information and the control current is determined according to an experimental calibration method or a real-time feedback calibration method.

[0035] According to the above technical means, the corresponding relationship between the vibration information and the control current can be determined through the test calibration method or the real-time feedback calibration method, thereby quickly realizing the output of the control current.

[0036] Further, the tailgate lock device includes a noise detection microphone and a feedback loop, wherein the noise detection microphone is used to detect the amplitude of the drum knocking sound in the vehicle;

[0037] Before obtaining the vehicle status information and the back door lock body status information, the method further includes:

[0038] Writing the corresponding relationship between the control current and the vibration information calibrated by the test calibration method into the control unit as an initial value;

[0039] The control unit outputs a regulating current according to the vibration information, including:

[0040] The control unit outputs an initial value of the control current according to the vibration information and a corresponding relationship between the control current and the vibration information;

[0041] When the amplitude of the drum beating sound in the vehicle is greater than a preset standard, the frequency, amplitude and phase in the vibration information are used as reference signals and feedback signals, and the control unit performs real-time correction on the frequency, amplitude and phase of the initial value of the regulating current.

[0042] According to the above-mentioned technical means, the control unit can make real-time corrections to the frequency, amplitude and phase of the initial value of the regulating current, that is, it has adaptive capability and can control the amplitude of the drum sound inside the vehicle in real time to meet different road excitation conditions, thereby improving the overall vehicle sound quality and customer satisfaction, and has a high cost-effectiveness.

[0043] A car comprises the tailgate locking device described in any one of the above items.

[0044] Beneficial effects of the present invention:

[0045] The vibration information of the tailgate vibration is acquired through the vibration sensor and fed back to the driving component, and the driving component drives the lock ring to slide according to the vibration information, so that the lock ring drives the tailgate to resist the rigid body modal vibration caused by road excitation, so that the tailgate tends to be stationary relative to the vehicle body, thereby achieving the suppression of road noise knocking sound; in addition, the driving component controls the movement of the lock ring according to the different vibration conditions of the tailgate, that is, the more intense the vibration condition of the tailgate, the more intense the movement of the lock ring, and the control effect of the road noise knocking sound is better than that of the rubber vibration damping layer with a fixed structure; in addition, by setting a vibration sensor on the tailgate, the vibration information of the tailgate can be identified more accurately and directly, thereby improving the accuracy of the control of the road noise knocking sound; in addition, in the embodiment of the present invention, it is only necessary to add a vibration sensor to the tailgate and modify the structure of the tailgate lock buckle, which is suitable for various types of cars and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of the arrangement structure of a back door lock device provided by an embodiment of the present invention on a vehicle;

[0047] Figure 2 A schematic diagram of the structure of the lock ring and the clamping plate in the back door lock device provided by an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of installing a back door lock in a back door lock device provided by an embodiment of the present invention;

[0049] Figure 4 for Figure 3 The enlarged schematic diagram of point A in the middle;

[0050] Figure 5 A schematic diagram of the structure of a back door lock device provided by an embodiment of the present invention;

[0051] Figure 6 A schematic diagram of the structure of a back door lock in a back door lock device provided in an embodiment of the present invention;

[0052] Figure 7 for Figure 6 A schematic cross-sectional view of the middle BB;

[0053] Figure 8 A schematic diagram of the connection between the lock ring, the sliding base plate and the gear in the back door lock device provided by an embodiment of the present invention;

[0054] Fig. 9 A schematic diagram of the connection between the driving motor and the gear in the back door lock device provided by an embodiment of the present invention;

[0055] Fig.10 A flowchart of the steps of the drumming sound control method provided by an embodiment of the present invention;

[0056] Fig.11 A flowchart of the steps of the drum sound calibration control method in practical application;

[0057] Fig.12 This is a schematic diagram of the effect of controlling the drum sound in actual application;

[0058] Fig.13 It is a schematic diagram of the effect of back door vibration speed control in actual application.

[0059] Among them, 1-vibration sensor, 2-card plate, 21-locking ring slot, 3-back door lock, 31-locking body, 311-screw hole, 32-locking ring, 33-gear, 34-sliding bottom plate, 341-main body, 342-teeth, 35-bottom plate slide rail, 351-slide groove, 36-mounting bolt, 37-transmission shaft, 4-control unit, 5-drive motor, 6-noise detection microphone, 7-vehicle body, 71-vehicle rear skirt, 8-back door. DETAILED DESCRIPTION

[0060] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0061] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0062] As customers have higher and higher requirements for ride comfort, the continuous improvement of in-car sound quality has become an important issue faced by many NVH (Noise, Vibration, Harshness) engineers, so major OEMs are paying more and more attention to the development of automotive NVH performance. As the carrier of vehicle parts, the car body is composed of many beams, columns, panels and passenger compartment sound cavity. During the driving process of the car, its body is stimulated by various dynamic loads (such as power transmission system and tire / suspension system excitation, etc.). These excitation energies are transmitted to the various panels of the body through the body beam and column structure. The stimulated vibration of the panel structure interacts with the sound cavity and radiates noise into the car.

[0063] Generally, in the development process of SUV (Sport Utility Vehicle) and MPV (Multi-purpose Vehicle) models, the back door is very susceptible to excited vibration, and its rigid body modal vibration is coupled with the passenger compartment sound cavity mode, squeezing the sound cavity to produce volume sound pressure fluctuations, resulting in low-frequency drumming problems, the problem frequency is generally 20Hz ~ 50Hz. At present, in order to solve the drumming problem of the back door, the back door structure is mainly strengthened, such as adding reinforcements, mainly to improve the bending mode, torsion mode and local mode of the back door, while the rigid body modal vibration of the back door is less affected. Practice has proved that its control effect is not good; or by controlling the amplitude of the back door vibration response, such as adding dynamic vibration absorbers or mass blocks, etc., generally need to be adjusted for the vibration absorber frequency and mass block weight after the prototype car comes out in the later stage of the project, but it requires additional cost and weight. If the dynamic vibration absorber or mass block is heavy, it may affect other performances such as the support capacity of the back door support rod. Therefore, for automobile body development, the low-frequency knocking sound problem caused by the vibration of the tailgate should be focused on in the early stage of project design verification to avoid modifying the mold due to changes in the body structure in the later stage of the project, which will increase the project development cost.

[0064] At present, the automobile includes a tailgate lock, and a bushing and a rubber vibration-damping layer are provided in the lock bottom plate of the tailgate lock, so that the lock and the car body have a vibration-damping function. When the lock is subjected to force and vibrates, the rubber vibration-damping layer absorbs the vibration energy, avoiding direct collision between the lock and the car body sheet metal and the bushing, reducing the abnormal noise generated by the lock during the opening and closing of the car door and the driving of the car, thereby reducing the noise transmitted to the interior of the car body. However, the structure of the above-mentioned rubber vibration-damping layer is fixed, and the effect of absorbing vibration energy is also fixed, that is, the control frequency of the noise is single and has no adaptive ability; in addition, under the excitation condition of complex and rough road surface, the effect of reducing noise is not good, or even fails. In order to solve the above problems, the embodiments of the present invention provide a tailgate lock device, a drum sound control method and a vehicle.

[0065] First, refer to Figures 1 to 9 The embodiment of the present invention proposes a tailgate lock device, comprising: a vibration sensor 1, which is arranged on the tailgate 8 of the car, and the vibration sensor 1 is used to obtain vibration information of the tailgate 8; a tailgate lock body, which is installed on the tailgate 8 and has a locked state; a tailgate lock 3, which includes a lock body 31 for installation on the vehicle body 7 and a lock ring 32 slidably connected to the lock body 31; a driving component, the driving component is connected to the lock ring 32, when the tailgate lock body is in the locked state, the lock ring 32 is locked on the tailgate lock body, and the driving component is used to drive the lock ring 32 to slide according to the vibration information, so that the lock ring 32 drives the tailgate 8 to resist the rigid body modal vibration caused by road excitation.

[0066] Specifically, the back door lock device provided in the embodiment of the present invention is applied to a car, and the car can be of various models, such as a sedan, a commercial vehicle, an off-road vehicle, or a sports utility vehicle. It should be noted that in the description of the embodiment of the present invention, the upper and lower positions, the front and rear positions, and the inner and outer positions are consistent with the upper and lower positions, the front and rear positions, and the inner and outer positions of the car. Figure 1 The automobile includes a vehicle body 7 and a back door 8 arranged at the rear of the vehicle body 7 .

[0067] The vibration sensor 1 can be arranged on the outside of the back door 8 or on the inside of the back door 8. The vibration sensor 1 can detect parameters such as vibration acceleration and speed, and convert these parameters into electrical signals. The vibration information of the back door 8 may include the frequency, amplitude, phase, etc. of the vibration of the back door 8. The back door lock body and the back door lock buckle 3 are used together to lock the back door 8. When the back door lock body is in the locked state, the back door 8 is locked and closed and cannot be opened. Figure 2 The back door lock body comprises a card plate 2, a lock ring card groove 21 is provided on the card plate 2, and the card plate 2 can rotate around the card plate axis. The back door lock body also has an unlocking state, and when the back door lock body is in the unlocking state, the back door 8 can be opened normally.

[0068] Reference Figure 4 and Figure 6 The lock body 31 is specifically installed on the rear skirt plate 71 of the vehicle body, and the connection between the lock body 31 and the rear skirt plate 71 of the vehicle body can be screwed. A plurality of screw holes 311 are provided on the lock body 31, and the lock body 31 is installed on the rear skirt plate 71 of the vehicle body through a plurality of mounting bolts 36 and screw holes 311. Of course, in other embodiments, if the back door is a side-opening door type, the lock body is specifically installed on the side edge beam. The lock ring 32 can be slidably connected to the lock body 31 along a first direction, and the first direction can refer to Figure 1 and Figure 6 The direction is shown by the arrow C. Figure 2 When the back door lock body is in the locked state, the lock ring 32 is locked in the lock ring slot 21, thereby locking the back door 8. When the back door lock body is in the locked state and needs to be unlocked, the card plate 2 rotates counterclockwise around the card plate axis to disengage the lock ring 32 from the lock ring slot 21, and the back door 8 can be opened normally. When the back door lock body is in the locked state, the movement of the lock ring 32 will drive the back door 8 to move.

[0069] When the vehicle is driving on a rough road, the excitation of the road surface is transmitted to the vehicle body 7 via the tire / suspension system and causes the tailgate 8 to vibrate. The tailgate 8 performs rigid body modal vibration relative to the vehicle body 7 and squeezes the sound cavity, thereby generating a road noise drum sound. The vibration information of the tailgate 8 vibration is obtained by the vibration sensor 1 and fed back to the drive component. The drive component uses the vibration information obtained by the vibration sensor 1 as a reference and drives the lock ring 32 to drive the tailgate 8 to vibrate in the same frequency in the opposite direction, thereby resisting the vibration transmitted to the tailgate 8 by the road surface-tire / suspension vehicle body 7-tailgate lock buckle 3, so that the tailgate 8 tends to be stationary relative to the vehicle body 7, thereby achieving the suppression of the road noise drum sound.

[0070] In the embodiment of the present invention, the vibration information of the vibration of the tailgate 8 is obtained by the vibration sensor 1 and fed back to the driving component, and the driving component drives the lock ring 32 to slide according to the vibration information, so that the lock ring 32 drives the tailgate 8 to resist the rigid body modal vibration caused by the road surface excitation, so that the tailgate 8 tends to be stationary relative to the vehicle body 7, thereby achieving the suppression of road noise knocking sound; in addition, the driving component controls the movement of the lock ring 32 according to the different vibration conditions of the tailgate 8, that is, the more intense the vibration condition of the tailgate 8, the more intense the movement of the lock ring 32, and the control effect of the road noise knocking sound is better than that of the rubber vibration-damping layer with a fixed structure; in addition, by setting the vibration sensor 1 on the tailgate 8, the vibration of the tailgate 8 can be more accurately and directly identified, thereby improving the accuracy of the control of the road noise knocking sound; in addition, in the embodiment of the present invention, it is only necessary to add a vibration sensor 1 to the tailgate 8 and modify the structure of the tailgate lock buckle 3, which is suitable for various types of cars and has good versatility.

[0071] Reference Figure 1 and Figure 5 The driving component includes a control unit 4 electrically connected to the vibration sensor 1 and a driving motor 5 electrically connected to the control unit 4. The back door lock 3 includes a moving component connected to the driving motor 5. The driving motor 5 is connected to the lock ring 32 through the moving component. The control unit 4 is used to output and regulate the current to the driving motor 5 according to the vibration information, so that the driving motor 5 drives the lock ring 32 to slide through the moving component.

[0072] Specifically, the control unit 4 may be connected to a power supply, and the power supply is used to supply power to the control unit 4. Figure 1, the control unit 4 can be located below the back door lock 3. The regulating current has a corresponding relationship with the vibration information, and the regulating current is calibrated according to the vibration information obtained by the vibration sensor 1. The control unit 4 may include an amplitude modulation, frequency modulation, and phase modulation unit, a regulating current output unit, and a motor control current output unit. The vibration sensor 1 is electrically connected to the calibration unit, and the calibration unit is electrically connected to the control unit 4. The vibration sensor 1 can send the vibration information to the control unit 4 through the calibration unit. The regulating current output unit is used to output the regulating current according to the vibration information. The motor control current output unit is used to output the motor control current, and the motor control current is used to control the opening and closing of the drive motor 5. The calibration unit is used to determine the corresponding relationship between the regulating current and the vibration information according to the experimental calibration method or the real-time feedback calibration method.

[0073] A drum beat control switch may be provided in the automobile, and the drum beat control switch is connected to the control unit 4. When the drum beat control switch is turned on, the drum beat control function is turned on, at which time, the motor control current controls the drive motor 5 to turn on, and the control unit 4 outputs the regulating current to the drive motor 5. When the drum beat control switch is turned off, the drum beat control function is turned off, at which time, the motor control current controls the drive motor 5 to turn off, and the control unit 4 no longer outputs the regulating current.

[0074] When the car moves at a certain speed, the back door 8 is in a closed state, and the road excitation is transmitted to the car body 7 through the tire / suspension system, and then transmitted to the back door 8 through the back door restraint system (hinge, back door lock, sealing strip and buffer block, etc.), causing the back door 8 to vibrate. The vibration sensor 1 is arranged on the back door 8, and the vibration information of the back door 8 can be fed back to the control unit 4. When the control unit 4 receives the vibration information of the back door 8, it provides a control current with the same frequency and opposite phase according to the vibration information, and controls the drive motor 5 to rotate, thereby driving the lock ring 32 to move through the moving component to drive the back door 8 to move so as to control the vibration of the back door 8, so that the back door 8 tends to a stationary state relative to the car body 7, so as to reduce the squeezing of the back door 8 on the sound cavity of the passenger compartment, and achieve the control of the low-frequency drum sound. In the embodiment of the present invention, through the setting of the control unit 4, the output of the control current can be realized, so that the control unit 4 controls the drive motor 5 to drive the lock ring 32 to slide through the moving component.

[0075] Reference Figure 6 , Figure 8 and Fig. 9 The moving component includes a gear 33 and a sliding base plate 34, the driving motor 5 is connected to the gear 33, the locking ring 32 is connected to the sliding base plate 34, the sliding base plate 34 is slidably connected to the lock body 31, the sliding base plate 34 includes a main body 341 and a plurality of teeth 342 arranged at the bottom of the main body 341, the teeth 342 are meshed with the gear 33, and the driving motor 5 is used to drive the gear 33 to rotate so that the gear 33 drives the sliding base plate 34 to slide.

[0076] Specifically, the gear 33 can be located in the lock body 31, and the drive motor 5 can be fixed in the lock body 31 by a bracket or a clamping method. The drive motor 5 is specifically connected to the gear 33 through a transmission shaft 37, and the drive motor 5 is used to drive the gear 33 to rotate counterclockwise or clockwise. The connection method between the lock ring 32 and the sliding base plate 34 can be riveted. In the embodiment of the present invention, through the arrangement of the gear 33 and the sliding base plate 34, the rotational motion of the drive motor 5 can be converted into a linear sliding motion of the sliding base plate 34, thereby realizing the driving of the sliding of the lock ring 32 connected to the sliding base plate 34.

[0077] The length direction of the automobile is taken as the first direction, the sliding direction of the sliding bottom plate 34 is consistent with the first direction, and the plurality of teeth 342 are distributed at intervals along the first direction.

[0078] Specifically, the first direction can refer to Figure 1 and Figure 6 The driving motor 5 is used to drive the gear 33 to rotate, so that the gear 33 drives the sliding bottom plate 34 to slide along the first direction, thereby making the lock ring 32 slide forward and backward along the first direction. In the embodiment of the present invention, the rigid body modal vibration of the tailgate 8 caused by the road surface excitation is mainly concentrated in the vibration in the front and rear direction. By setting the sliding direction of the sliding bottom plate 34 to be consistent with the first direction, the lock ring 32 can slide forward and backward along the first direction, thereby improving the suppression effect of the road noise drum sound.

[0079] Reference Figures 6 to 8 A bottom plate slide rail 35 is provided on the lock body 31 , and a slide groove 351 penetrating along the first direction is opened on the bottom plate slide rail 35 , and the sliding bottom plate 34 is slidably connected in the slide groove 351 .

[0080] Specifically, the extension direction of the bottom plate slide rail 35 is consistent with the first direction. A lubricant is applied between the sliding bottom plate 34 and the slide groove 351 to reduce the sliding friction of the sliding bottom plate 34. In the embodiment of the present invention, the bottom plate slide rail 35 is provided to realize the sliding connection of the sliding bottom plate 34 to the lock body 31, and the bottom plate slide rail 35 can ensure the smooth sliding of the sliding bottom plate 34.

[0081] Reference Figure 7 The cross section of the slide groove 351 is trapezoidal, and along the second direction, the width of the opening of the slide groove 351 is smaller than the width of the bottom of the slide groove 351, wherein the second direction is perpendicular to the first direction.

[0082] Specifically, the cross section of the slide groove 351 is a cross section of the slide groove 351 perpendicular to the first direction. The cross section of the main body 341 of the sliding bottom plate 34 is a trapezoid matching the slide groove 351. Figure 6In the embodiment of the present invention, through the above arrangement, the sliding bottom plate 34 can only slide along the first direction, thereby preventing the sliding bottom plate 34 from falling out of the sliding groove 351 along the height direction of the vehicle.

[0083] The lock ring 32 is riveted to the sliding bottom plate 34. In the embodiment of the present invention, the riveting connection method can ensure the connection performance between the lock ring 32 and the sliding bottom plate 34.

[0084] It can be understood that the above examples are merely examples listed for better understanding of the technical solutions of the embodiments of the present invention, and are not intended to be the sole limitations on the embodiments of the present invention.

[0085] In a second aspect, an embodiment of the present invention provides a drum-knocking control method, which is applied to any one of the back door latch devices in the first aspect. And because the drum-knocking control method is applied to the back door latch device, it also has the beneficial effects of the back door latch device.

[0086] Reference Fig.10 , a drumming sound control method, comprising:

[0087] Step 101, obtaining vehicle status information and back door lock body status information.

[0088] Specifically, the state information of the car includes a driving state and a non-driving state. The state information of the back door lock body includes a locked state and an unlocked state. When the back door lock body is in the locked state, the back door is locked and cannot be opened.

[0089] Step 102, when the vehicle state information is a driving state and the tailgate lock body state information is a locked state, the driving component drives the lock ring to slide according to the vibration information obtained by the vibration sensor, so that the lock ring drives the tailgate to resist the rigid body modal vibration caused by the road surface excitation. Specifically, when the tailgate lock body state information is a locked state, the lock ring slides to drive the tailgate to move, thereby resisting the rigid body modal vibration caused by the road surface excitation.

[0090] The driving assembly includes a control unit electrically connected to the vibration sensor and a driving motor electrically connected to the control unit, and the back door lock includes a moving component connected to the driving motor. In step 102, the driving assembly drives the lock ring to slide according to the vibration information obtained by the vibration sensor, including:

[0091] The control unit outputs a control current to the drive motor according to the vibration information, so that the drive motor drives the lock ring to slide through the moving component. Specifically, the control unit outputs a control current to the drive motor according to the frequency, amplitude and phase of the vibration in the vibration information of the back door, based on the basic principle of the same frequency, opposite phase and appropriate amplitude, so that the drive motor drives the lock ring to slide through the moving component, and drives the back door to vibrate in the same frequency in the opposite direction, thereby offsetting the vibration transmitted to the back door by the road surface-tire / suspension-body-lock buckle, making the back door tend to be stationary relative to the body, and achieving the purpose of suppressing the road noise drumming sound.

[0092] The control unit outputs the control current according to the vibration information, including: the control unit outputs the control current according to the vibration information and the corresponding relationship between the control current and the vibration information, wherein the corresponding relationship between the vibration information and the control current is determined according to an experimental calibration method or a real-time feedback calibration method.

[0093] Specifically, the test calibration method includes: the test vehicle is driven at a constant speed at a preset speed on the test road, the noise inside the vehicle is monitored by a noise detection microphone, and the amplitude of the drum sound is identified. The frequency, amplitude and phase of the back door vibration identified by the vibration sensor are continuously corrected and tested repeatedly by the frequency modulation, amplitude modulation and phase modulation unit according to the basic principles of the same frequency, opposite phase and appropriate amplitude, until the amplitude of the drum sound is reduced to below the preset standard, and the corresponding relationship between the control current and the low-frequency drum sound at the preset speed is obtained; repeat the above test to obtain the corresponding relationship between the low-frequency drum sound and the control current at different speeds. It should be noted that the purpose of the control unit outputting the control current is to reduce noise. Generally, the parameters such as the frequency, amplitude and phase of the control current under the best noise reduction state in the calibration test are used as the calibration value of the control current. The preset standard is the standard that the amplitude of the drum sound must meet in advance. The test calibration method has the advantages of low cost and high cost performance.

[0094] The real-time feedback calibration method includes: setting a noise detection microphone and a feedback loop on the car. Taking the amplitude of the drumming sound in the car monitored in real time by the noise detection microphone as the target, and the frequency, amplitude and phase of the back door vibration detected by the vibration sensor as the reference and feedback signal, the control current is frequency-modulated, amplitude-modulated and phase-modulated by the active control algorithm built into the control unit until the amplitude of the drumming sound in the car is reduced to below the preset standard. This real-time feedback calibration method has the advantage of good adaptability. In an embodiment of the present invention, the corresponding relationship between the vibration information and the control current can be determined by the test calibration method or the real-time feedback calibration method, thereby quickly realizing the output of the control current.

[0095] The back door lock device includes a noise detection microphone 6 and a feedback loop, wherein the noise detection microphone 6 is used to detect the amplitude of the drum beating sound in the vehicle. The amplitude of the drum beating sound in the vehicle can be determined according to the sound pressure level in the vehicle detected by the noise detection microphone 6.

[0096] Before step 101 of acquiring the vehicle status information and the back door lock body status information, the method further includes: writing the corresponding relationship between the control current and the vibration information calibrated by the test calibration method into the control unit as an initial value.

[0097] The control unit outputs a regulating current according to the vibration information, including: the control unit outputs an initial value of the regulating current according to the vibration information and the corresponding relationship between the regulating current and the vibration information; when the amplitude of the drum sound in the car is greater than a preset standard, the frequency, amplitude and phase in the vibration information are used as reference signals and feedback signals, and the frequency, amplitude and phase of the initial value of the regulating current are corrected in real time through the control unit.

[0098] In the embodiment of the present invention, the control unit can make real-time corrections to the frequency, amplitude and phase of the initial value of the control current, that is, it has adaptive capability and can control the amplitude of the drum sound inside the vehicle in real time to meet different road excitation conditions, thereby improving the sound quality of the entire vehicle and customer satisfaction, and has a high cost-effectiveness.

[0099] It should be noted that for vehicles that do not have noise detection microphones and feedback loops, the calibrated parameters such as frequency, amplitude and phase of the control current are directly written into the control unit and solidified, and it does not have adaptive capabilities.

[0100] Reference Fig.11 In practical application, a drum sound calibration control method is provided, comprising:

[0101] S1, test and identify low-frequency drumming sounds of road noise.

[0102] During the vehicle model project development stage, a noise detection microphone is placed near the ear of the driver or passenger in the vehicle, and a vibration sensor is placed on the back door outer panel. The vehicle interior noise and back door vibration are tested at different vehicle speeds from 10km / h to 100km / h at intervals of 10km / h. The peak values ​​of the noise spectrum and back door vibration spectrum within 20Hz to 50Hz at each vehicle speed (i.e., the peak value corresponding to the low-frequency drum sound, such as Fig.12 The peak value of the solid line curve of the sound pressure level spectrum of the vehicle at a constant speed in the original state near 32Hz), frequency, amplitude, and the rigid body modal vibration mode of the back door (such as Fig.13 The peak value of the solid line curve of the uniform speed rear door vibration spectrum of the whole vehicle in the original state is identified.

[0103] S2, regulating current calibration.

[0104] The frequency, amplitude and phase of the regulating current are calibrated through repeated tests. The calibration can be performed through the above-mentioned test calibration method and real-time feedback calibration method. The basic principles of calibration are: the frequency of the regulating current is consistent with the frequency of the rigid body modal vibration of the tailgate; the phase of the regulating current is calibrated so that the force of the tailgate lock on the tailgate is always opposite to the direction of the rigid body modal vibration of the tailgate; the amplitude of the regulating current is calibrated to minimize the amplitude of the rigid body modal vibration of the tailgate, so that the tailgate tends to be stationary relative to the vehicle body, and the amplitude of the low-frequency drumming sound is reduced to a range below the preset standard.

[0105] S3, development of active control scheme for drum beating of mass-produced vehicles.

[0106] The first method, for vehicles that do not have noise detection microphones and feedback loops, directly writes the calibrated parameters such as frequency, amplitude and phase of the control current into the control unit and solidifies them. It does not have adaptive capabilities.

[0107] The second method, for vehicles equipped with noise detection microphones and feedback loops, writes the calibrated frequency, amplitude, phase and other parameters of the control current into the control unit as initial values, and uses the active control algorithm built into the control unit to achieve real-time correction of the frequency, amplitude, phase and other parameters of the control current, with adaptive capabilities.

[0108] S4, judging whether the low-frequency drum sound meets the target.

[0109] After the above identification and calibration, the drumming sound calibration control method provided by the embodiment of the present invention can effectively reduce the low-frequency drumming sound of road noise. If the low-frequency drumming sound meets the target requirement, that is, the amplitude of the low-frequency drumming sound is reduced to below the preset standard, the calibration is stopped. If the result does not meet the target requirement, the calibration of S2 is continued until the low-frequency drumming sound meets the target requirement.

[0110] Fig.12 A comparison chart of the drumming sound spectrum of a certain car model is given. Fig.12 The solid line in the figure is the spectrum curve of the sound pressure level inside the vehicle at a constant speed under the original state (i.e., without drumming sound control). Fig.12 The dotted line in the figure is the spectrum curve of the sound pressure level in the vehicle at a uniform speed after the drum knocking sound is controlled. After adopting the tailgate lock device and method proposed in the embodiment of the present invention, the amplitude of the drum knocking sound of this vehicle type is reduced by about 4dB(A). Fig.13 The comparison chart of the back door vibration spectrum of a certain car model is given. Fig.13 The solid line in the figure is the vibration spectrum curve of the vehicle's uniform speed rear door under the original state (i.e., without drum sound control). Fig.13 The dotted line in the figure is the vibration spectrum curve of the vehicle's uniform speed rear door after drum sound control.

[0111] In a third aspect, an embodiment of the present invention provides an automobile, the automobile comprising any one of the tailgate lock devices in the first aspect. Since the automobile comprises the tailgate lock device, the automobile also has the beneficial effects of the tailgate lock device. The automobile provided by the embodiment of the present invention comprises the various structures of the tailgate lock device in any one of the above embodiments, which will not be described here in detail to avoid repetition.

[0112] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A back door lock device, characterized in that: include: A vibration sensor (1) is arranged on a back door (8) of a car, and the vibration sensor (1) is used to obtain vibration information of the back door (8); A back door lock body, mounted on the back door (8), the back door lock body being in a locked state; A back door lock (3) comprises a lock body (31) for being mounted on a vehicle body (7) and a lock ring (32) slidably connected to the lock body (31); A drive component is connected to the lock ring (32). When the tailgate lock body is in a locked state, the lock ring (32) is locked on the tailgate lock body. The drive component is used to drive the lock ring (32) to slide according to the vibration information, so that the lock ring (32) drives the tailgate (8) to resist the rigid body modal vibration caused by road excitation.

2. The back door lock device according to claim 1, characterized in that: The driving component comprises a control unit (4) electrically connected to the vibration sensor (1) and a driving motor (5) electrically connected to the control unit (4); the tailgate lock (3) comprises a moving component connected to the driving motor (5); the driving motor (5) is connected to the lock ring (32) via the moving component; the control unit (4) is used to output a regulating current to the driving motor (5) according to the vibration information, so that the driving motor (5) drives the lock ring (32) to slide via the moving component.

3. The back door lock device according to claim 2, characterized in that: The moving component comprises a gear (33) and a sliding base plate (34); the driving motor (5) is connected to the gear (33); the locking ring (32) is connected to the sliding base plate (34); the sliding base plate (34) is slidably connected to the lock body (31); the sliding base plate (34) comprises a body (341) and a plurality of teeth (342) arranged at the bottom of the body (341); the teeth (342) are meshed with the gear (33); the driving motor (5) is used to drive the gear (33) to rotate so that the gear (33) drives the sliding base plate (34) to slide.

4. The back door lock device according to claim 3, characterized in that: The length direction of the automobile is taken as a first direction, the sliding direction of the sliding bottom plate (34) is consistent with the first direction, and the plurality of teeth (342) are distributed at intervals along the first direction.

5. The back door lock device according to claim 4, characterized in that: The lock body (31) is provided with a bottom plate slide rail (35), the bottom plate slide rail (35) is provided with a slide groove (351) penetrating along the first direction, and the sliding bottom plate (34) is slidably connected in the slide groove (351).

6. The back door lock device according to claim 5, characterized in that: The cross section of the slide groove (351) is trapezoidal, and along the second direction, the width of the opening of the slide groove (351) is smaller than the width of the bottom of the slide groove (351), wherein the second direction is perpendicular to the first direction.

7. The back door lock device according to claim 3, characterized in that: The locking ring (32) is riveted to the sliding base plate (34).

8. A drumming sound control method, characterized in that: Applied to the tailgate lock device according to any one of claims 1 to 7, the drum knocking sound control method comprises: Get the vehicle status information and back door lock status information; When the vehicle status information is a driving status and the tailgate lock body status information is a locked status, the driving component drives the lock ring to slide according to the vibration information obtained by the vibration sensor, so that the lock ring drives the tailgate to resist the rigid body modal vibration caused by road excitation.

9. The drumming sound control method according to claim 8, characterized in that: The driving assembly includes a control unit electrically connected to the vibration sensor and a driving motor electrically connected to the control unit, and the back door lock includes a moving component connected to the driving motor; The driving component drives the lock ring to slide according to the vibration information obtained by the vibration sensor, including: The control unit outputs a regulating current to the drive motor according to the vibration information, so that the drive motor drives the lock ring to slide through the moving component.

10. The drumming sound control method according to claim 9, characterized in that: The control unit outputs a regulating current according to the vibration information, comprising: The control unit outputs the control current according to the vibration information and the corresponding relationship between the control current and the vibration information, wherein the corresponding relationship between the vibration information and the control current is determined according to an experimental calibration method or a real-time feedback calibration method.

11. The drumming sound control method according to claim 10, characterized in that: The back door lock device includes a noise detection microphone and a feedback loop, wherein the noise detection microphone is used to detect the amplitude of the drum knocking sound in the vehicle; Before obtaining the vehicle status information and the back door lock body status information, the method further includes: Writing the corresponding relationship between the control current and the vibration information calibrated by the test calibration method into the control unit as an initial value; The control unit outputs a regulating current according to the vibration information, comprising: The control unit outputs an initial value of the control current according to the vibration information and a corresponding relationship between the control current and the vibration information; When the amplitude of the drum beating sound in the vehicle is greater than a preset standard, the frequency, amplitude and phase in the vibration information are used as reference signals and feedback signals, and the control unit performs real-time correction on the frequency, amplitude and phase of the initial value of the regulating current.

12. A car, characterized in that: It comprises the tailgate lock device according to any one of claims 1 to 7.

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