阅读说明：本技术 一种用于车载摄像头的清洁系统 (Cleaning system for vehicle-mounted camera ) 是由 曾迪 邱安崇 刘鹏 谢财胜 黄力 于 2019-09-04 设计创作，主要内容包括：本申请涉及一种用于车载摄像头的清洁系统,至少包括控制单元、以及清洁单元,其中,清洁单元,安装在车载摄像头上,包括屏蔽罩、滤光片、以及至少一件换能片,用于将车载摄像头与外部隔离；控制单元,集成在车载主机中,通过通讯线束与所述换能片连接,所述控制单元通过向所述换能片输出控制信号,使所述清洗单元进行循环清洁。其有益效果在于,本申请通过超声波信号输出模块向换能片驱动模块输出正弦波信号、余弦波信号,通过逻辑开关模块向换能片驱动模块输出第一开关信号、第二开关信号控制清洁单元内的换能片振动,以实现循环清洁,清洁效果显著。同时,摄像头与清洁单元分离,不仅实现摄像头与外界隔离,且安装方便。(The application relates to a cleaning system for a vehicle-mounted camera, which at least comprises a control unit and a cleaning unit, wherein the cleaning unit is arranged on the vehicle-mounted camera and comprises a shielding case, an optical filter and at least one energy conversion sheet, and the cleaning unit is used for isolating the vehicle-mounted camera from the outside; and the control unit is integrated in the vehicle-mounted host and is connected with the energy conversion sheet through a communication wire harness, and the control unit enables the cleaning unit to perform circular cleaning by outputting a control signal to the energy conversion sheet. The ultrasonic cleaning device has the advantages that the ultrasonic signal output module outputs sine wave signals and cosine wave signals to the energy conversion sheet driving module, and the logic switch module outputs first switch signals and second switch signals to the energy conversion sheet driving module to control the energy conversion sheet in the cleaning unit to vibrate, so that circular cleaning is realized, and the cleaning effect is remarkable. Meanwhile, the camera is separated from the cleaning unit, so that the camera is isolated from the outside, and the installation is convenient.)

1. A cleaning system for a vehicle-mounted camera, characterized by comprising at least a control unit (100), and a cleaning unit (200), wherein,

the cleaning unit (200) is arranged on the vehicle-mounted camera and comprises a shielding cover assembly and at least one transduction piece (230) arranged along the inner wall of the shielding cover assembly; the transduction piece (230) is connected with the control unit (100), and the transduction piece (230) cleans the shielding case assembly through signals transmitted by the control unit (100);

and the control unit (100) is integrated in the vehicle-mounted host machine and is connected with the transducer plate (230) through a communication wiring harness (240), and the control unit (100) outputs signals to the transducer plate (230) to enable the cleaning unit (200) to perform circulating cleaning.

2. The cleaning system for the vehicle-mounted camera according to claim 1, wherein the control unit (100) comprises a main control module (110), an ultrasonic signal output module (120), a logic switch module (130), and a transducer sheet driving module (140), the main control module (110) is respectively connected with the transducer sheet driving module (140) through the ultrasonic signal output module (120) and the logic switch module (130), and the transducer sheet driving module (140) is connected with the transducer sheet (230) through a communication wiring harness (240).

3. The cleaning system for the vehicle-mounted camera according to claim 2, wherein the ultrasonic signal output module (120) comprises a signal generating module (121), a phase shift module (123), a power amplifying module (122), and a power supply module (124); one end of the signal generation module (121) is connected with the main control module (110), and the other end of the signal generation module (121) is connected with the power amplification module (122); the signal generating module (121) is also connected with the power amplifying module (122) through a phase shift module (123), and the power supply module (124) is connected with the power amplifying module (122); the power amplification module (122) amplifies the sine wave signal generated by the signal generation module (121) and the cosine wave signal generated by the phase shift module (123), and outputs the amplified sine wave signal and cosine wave signal to the transducer driving module (140).

4. A cleaning system for vehicle-mounted camera according to claim 3, characterized in that the power amplification module (122) is a class D power amplifier.

5. The cleaning system for the vehicle-mounted camera according to claim 3, wherein the logic switch module (130) is a logic deserializer, and receives the signal from the main control module (110) and converts the signal into a first switch signal and a second switch signal which are output to the transducer driving module (140) so as to control the output state of the transducer driving module (140).

6. The cleaning system for the vehicle-mounted camera according to claim 5, wherein the output states of the transducer driving module (140) include a first output state in which a positive pole is a sine wave, a second output state in which a negative pole is a sine wave, a third output state in which a positive pole is a cosine wave, and a fourth output state in which a negative pole is a cosine wave.

7. The cleaning system for the vehicle-mounted camera is characterized in that the transducer driving module (140) is further provided with a signal feedback end, and the signal feedback end is connected with the main control module (110) through an operational amplifier.

8. The cleaning system for the vehicle-mounted camera is characterized in that the shielding case assembly comprises a shielding case shell (210) fixed on the vehicle-mounted camera and an optical filter (220) arranged on the outer surface of the shielding case shell (210), and the transducer piece (230) is arranged along the edge of the optical filter (220) and fixed in the shielding case shell (210).

9. The cleaning system for the vehicle-mounted camera according to claim 8, wherein the number of the transduction plates (230) is 4, and 4 transduction plates (230) are annularly and equidistantly arranged below the optical filter (220).

10. The cleaning system for the vehicle-mounted camera is characterized in that a groove is dug inwards on the inner wall of the shield shell (210), and the optical filter (220) and the transducer (230) are fixed in the groove in a clamping mode.

Technical Field

The application relates to the technical field of automotive electronics, in particular to a cleaning system for a vehicle-mounted camera.

Background

Along with the intellectualization and the unmanned development of automobiles, the vehicle-mounted camera is more and more important as a visual perception module of the vehicle, a back-view camera is basically matched with a common vehicle, a driver is helped to effectively reduce blind areas of the vehicle, and more than 10 cameras are even equipped on some high-end unmanned auxiliary vehicles. However, most of these cameras are arranged outside the vehicle, and during normal use, various application scenarios affecting the perception of the camera acquisition are inevitably encountered: muddy road conditions, rainy road conditions, dust road conditions, sleet road conditions, frost environment etc. in these scenes for the camera lens, inevitable situation such as dirty can appear, shelter from causes the image display bad, thereby influences customer's user experience, to automatic driving's vehicle, directly leads to the potential safety hazard, if with conventional clearance mode, if blow or washing from cleaning device, unable all effectively clear away.

The current solution to this problem, 1, clean after parking. The most conventional method, but the camera is scrubbed before every time getting on the bus, if the vehicle is dirty while driving, still need to stop the vehicle and process, very inconvenient for the driver, 2, increase the wiper at the lens, increase a micro-motor rotating part at the lens, install the wiper device in the rotating part, control the wiper to clean the lens position of the camera through the rotation of the control motor. The automatic cleaning system and the method have the application number of CN107745697A, and disclose an automatic cleaning device, which comprises a cleaning agent, a control unit and a wiper device added at the front end of a camera, wherein the wiper device is controlled to directly clean a lens during working.

Disclosure of Invention

In order to solve the above technical problem, the present application provides a cleaning system for a vehicle-mounted camera, at least comprising a control unit and a cleaning unit, wherein,

the cleaning unit is arranged on the vehicle-mounted camera, comprises a shielding cover, an optical filter and at least one energy conversion sheet and is used for isolating the vehicle-mounted camera from the outside;

and the control unit is integrated in the vehicle-mounted host and is connected with the energy conversion sheet through a communication wire harness, and the control unit enables the cleaning unit to perform circular cleaning by outputting a control signal to the energy conversion sheet.

Optionally, the control unit includes a main control module, an ultrasonic signal output module, a logic switch module, and a transducer driving module, the main control module is connected with the transducer driving module through the ultrasonic signal output module and the logic switch module, respectively, and the transducer driving module is connected with the transducer through a communication harness.

Optionally, the ultrasonic signal output module includes a signal generation module, a phase shift module, a power amplification module, and a power supply module; one end of the signal generation module is connected with the main control module, and the other end of the signal generation module is connected with the power amplification module; the signal generation module is also connected with the power amplification module through a phase offset module, and the power supply module is connected with the power amplification module; the power amplification module amplifies the sine wave signal generated by the signal generation module and the cosine wave signal generated by the phase deviation module and outputs the amplified sine wave signal and the amplified cosine wave signal to the energy conversion sheet driving module.

Optionally, the power amplification module is a class D power amplifier.

Optionally, the logic switch module is a logic deserializer, and receives a signal transmitted from the main control module, and converts the signal into a first switch signal and a second switch signal, which are output to the transducer driving module, so as to control the output state of the transducer driving module.

Optionally, the output states of the transducer driving module include a first output state in which a positive electrode is a sine wave, a second output state in which a negative electrode is a sine wave, a third output state in which a positive electrode is a cosine wave, and a fourth output state in which a negative electrode is a cosine wave.

Optionally, the transducer driving module is further provided with a signal feedback end, and the signal feedback end is connected with the main control module through an operational amplifier.

Optionally, the shield cover assembly comprises a shield cover shell fixed on the vehicle-mounted camera and a light filter arranged on the outer surface of the shield cover shell, and the energy conversion piece is arranged along the edge of the light filter and fixed in the shield cover shell.

Optionally, the number of the energy conversion sheets is 4, and the 4 energy conversion sheets are arranged below the optical filter in an annular equidistant manner.

Optionally, a groove is dug inwards on the inner wall of the shield shell, and the optical filter and the energy conversion sheet are fixed in the groove in a clamping manner.

Optionally, the transducer plate has a vibration frequency of 20Khz ~ 10 MHz.

The cleaning system for the vehicle-mounted camera has the advantages that the ultrasonic signal output module outputs sine wave signals and cosine wave signals to the transduction piece driving module, and the logic switch module outputs first switch signals and second switch signals to the transduction piece driving module to control the vibration of the transduction piece in the cleaning unit, so that the circular cleaning is realized, and the cleaning effect is obvious. Meanwhile, the camera is separated from the cleaning unit, so that the camera is isolated from the outside, and the installation is convenient.

Drawings

FIG. 1 is a schematic diagram of a cleaning system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a control unit according to an embodiment of the present application;

FIG. 3 is a schematic diagram of an ultrasonic signal output module according to an embodiment of the present application;

FIG. 4 is a signal flow diagram of a control unit according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an output state of a transducer driving module according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a cleaning unit according to an embodiment of the present application;

FIG. 7 is a schematic top view of a cleaning unit according to an embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a cleaning unit of an embodiment of the present application;

FIG. 9 is a schematic diagram illustrating a filter cleaning process according to an embodiment of the present disclosure;

the system comprises a control unit 100, a cleaning unit 200, a main control module 110, an ultrasonic signal output module 120, a logic switch module 130, a transducer driving module 140, a signal generating module 121, a power amplifying module 122, a phase shift module 123, a power supply module 124, a shielding case 210, a light filter 220, a transducer 230 and a communication wiring harness 240.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.

In the embodiments shown in fig. 1-9, the present application provides a cleaning system for an in-vehicle camera, comprising at least a control unit 100, and a cleaning unit 200, wherein,

the cleaning unit 200 is arranged on the vehicle-mounted camera and comprises a shielding cover assembly and at least one transducer piece 230 arranged along the inner wall of the shielding cover assembly; the transducer 230 is connected with the control unit 100, and the transducer 230 cleans the shielding case assembly through signals transmitted by the control unit 100;

the control unit 100 is integrated in the on-board host, and is connected to the transducer plate 230 through a communication harness 240, and the control unit 100 outputs a control signal to the transducer plate 230 to enable the cleaning unit 200 to perform the circulation cleaning.

In one implementation of the above embodiment, the present system includes a cleaning unit 200, a control unit 100, the control unit 100 is integrated in an on-vehicle host, the cleaning unit 200 is mounted on an on-vehicle camera; the control unit 100 is connected to the transducer plate 230 of the cleaning unit 200 via a communication harness 240; the control unit 100 receives a cleaning signal transmitted from the vehicle-mounted host computer, and outputs a sine wave signal and a cosine wave signal for controlling the vibration frequency of the transducer plates 230, and a first switching signal P1 and a second switching signal N1 for selecting the vibration frequency of the transducer plates 230 to the transducer plates 230 of the cleaning unit 200; at least one transducer 230 of the cleaning unit 200 is controlled by two signals to perform cyclic cleaning; in the present embodiment, the number of transducer blades 230 is 4. This application has realized the circulation cleanness, and clean effect is showing. Meanwhile, the camera is separated from the cleaning unit 200, so that the camera is isolated from the outside, and the installation is convenient.

In some embodiments, the control unit 100 includes a main control module 110, an ultrasonic signal output module 120, a logic switch module 130, and a transducer driving module 140, wherein the main control module 110 is connected to the transducer driving module 140 through the ultrasonic signal output module 120 and the logic switch module 130, respectively, and the transducer driving module 140 is connected to the transducer 230 through a communication harness 240. In an implementation manner of the foregoing embodiment, the main control module 110 includes a main control chip, and the main control chip may be an S32K series chip of NXP, an RH850 series chip of rassa, or other chips capable of implementing the technical solution of the present application; the main control chip is connected with the transducer driving module 140 through the ultrasonic signal output module 120 and the logic switch module 130, and outputs a control signal to the ultrasonic signal output module 120, so that the ultrasonic signal output module 120 generates a sine wave signal and a cosine wave signal; the switching signals are output to the logic switching module 130, such that the logic switching module outputs 130 the first switching signal P1 and the second switching signal N1. Wherein, the number of the transducer driving modules 140 can be one or more; when the number of the transducer driving modules 140 is multiple, the switching signal output by the main control module 110 to the logic switch module 130 is a serial signal including multiple switching signals, and the logic switch module 130 deserializes the serial signal and sends different switching signals to the multiple transducer driving modules 140 connected to the logic switch module 130. The transducer driving module 140 controls the sine wave signal or the cosine wave signal accessed by the transducer driving module 140 through the first switch information and the second switch signal transmitted from the logic switch module 130, so as to realize the cyclic driving of the transducer driving modules 140 and realize the cyclic cleaning.

In some embodiments, the ultrasonic signal output module 120 includes a signal generation module 121, a phase shift module 123, a power amplification module 122, and a power supply module 124; one end of the signal generating module 121 is connected to the main control module 110, and the other end of the signal generating module 121 is connected to the power amplifying module 122; the signal generating module 121 is further connected to the power amplifying module 122 through the phase shift module 123, and the power supply module 124 is connected to the power amplifying module 122; the power amplification module 122 amplifies the sine wave signal generated by the signal generation module 121 and the cosine wave signal generated by the phase shift module 123, and outputs the amplified signals to the transducer driving module 140. The power amplification module 122 is a class D power amplifier. In one implementation of the above embodiment, the ultrasonic signal output module 120 generates a sine wave signal through the signal generation module, and the sine wave signal generated by the signal generation module 121 is transmitted to the phase shift module 123 to convert the sine wave signal into a cosine wave signal; the sine wave signal and the cosine wave signal are amplified by the power amplification module 122, and then the sine wave signal or the cosine wave signal is output to the transducer driving module 140. The class-D power amplifier is a pulse-controlled high-current switching amplifier, and converts the PWM signal output by the comparator into a high-voltage high-current high-power PWM signal. The class D power amplifier may be composed of a modulator, an amplifier, and a low pass filter, and the class D power amplifier may be an NJU8721 manufactured by new japanese wireless corporation, a TPA2000D2 manufactured by TI corporation, or other class D power amplifiers capable of implementing the functions of the present application.

In some embodiments, the logic switch module 123 is a logic deserializer, and receives the signal from the main control module 110, and converts the signal into a first switch signal and a second switch signal, which are output to the transducer driving module 123, so as to control the output state of the transducer driving module 140. In an implementation manner of the above embodiment, the logic deserializer is substantially a deserializer, and outputs the first switching signal and the second switching signal to the transducer driving module 140 by receiving and deserializing the switching signal packet from the main control module 110; when the logic switch module 130 is connected to a plurality of transducer driving circuits, the logic switch module 130 may receive and deserialize the serial signal transmitted from the main control module 110 by setting the deserializing module, so that different switch signals are output to different transducer driving modules 140.

In some embodiments, the output states of the transducer driving module 140 include a first output state with a positive pole of a sine wave, a second output state with a negative pole of a sine wave, a third output state with a positive pole of a cosine wave, and a fourth output state with a negative pole of a cosine wave. In one implementation of the above embodiment, the transducer driving module 140 is provided with a gate circuit for controlling the on/off of the sine wave signal or the cosine wave signal of the ultrasonic signal output module 120 by receiving the first switch signal P1 and the second switch signal N1; the first output state, the second output state, the third output state and the fourth output state are shown in the figure.

In some embodiments, the transducer driving module 140 further has a signal feedback terminal, and the signal feedback terminal is connected to the main control module 110 through an operational amplifier; in an implementation manner of the above embodiment, the transducer driving module 140 is provided with a signal feedback end connected to the main control chip 110; and the output state of the detection circuit is sent to the main control chip for feedback, so that the detection circuit is used.

In some embodiments, referring to fig. 6-9, the shielding case 210 is disposed on the vehicle-mounted camera, the optical filter 220 is disposed on the outer surface of the shielding case 210 to isolate the vehicle-mounted camera from the outside, the transducing pieces 220 are disposed along the edge of the optical filter and fixed in the shielding case 210, and the transducing pieces 230 are respectively connected with the transducing piece driving modules 140. in one embodiment of the above embodiments, the shielding case assembly includes a shielding case housing fixed on the vehicle-mounted camera and an optical filter disposed on the outer surface of the shielding case housing, the transducing pieces are disposed along the edge of the optical filter and fixed in the shielding case housing, the transducing pieces are 4, the transducing pieces are disposed in an annular shape under the optical filter at equal intervals, a groove is dug inward in the inner wall of the shielding case housing, the optical filter and the transducing pieces are fixed by being clamped in the groove, as shown in fig. 8, the transducing pieces 230 and the transducing piece driving modules 140 are all 4, the transducing pieces 230 have a vibration frequency of 20Khz ~ 10mhz, the transducing pieces are disposed in an annular shape under the optical filter 220, an outer side is a positive input end and an inner side of the optical filter is changed into a negative input end, and a turbine signal is circularly cleaned to be input end of the.

In some embodiments, the main control module 110 controls the signal generating module 121 of the ultrasonic signal output module 120 to generate sine wave signals with different frequencies, and the sine wave signals are simultaneously connected to the phase shift module 123 to generate cosine wave signals; the sine wave signal and the cosine wave signal pass through the power amplification module 122 at the same time, output a high-voltage sine wave signal and a high-voltage cosine wave signal, and are connected to the transducer driving module 140, and the high-voltage signal is designed to be greater than 50V at the peak value; the main control chip controls the logic switch module 130 to output a first switch signal and a second switch signal, which gate the transducer driving module 140 to output a sine wave signal or a cosine wave signal. The output end of the transduction piece driving module 140 is connected to the positive input end and the negative input end of the transduction piece 230 in the shielding case 210 through an external communication wire harness, the transduction piece receives a level signal, electric energy is converted into mechanical energy, and a cleaning effect is achieved through vibration. When the energy conversion sheet works in a vibration mode, the output signals are fed back to a monitoring circuit of the main control chip and are converted by the DAC (digital-to-analog converter) and fed back to the vehicle-mounted host, and the vibration frequency and the vibration direction are controlled better; the main control chip generates signals with different frequencies through the control signal generator module 121, so that the vibration frequency of the energy conversion sheet in the shielding case is changed; the main control chip changes the sine wave signal and the cosine wave signal according to the relationship of F (theta, t) and the first switch signal and the second switch signal of the logic control module, wherein t represents time, and can be adjusted according to actual conditions to perform circular vibration operation on the optical filter 220. According to the ultrasonic cleaning device, the ultrasonic signal output module 120 outputs sine wave signals and cosine wave signals to the energy conversion sheet driving module 140, and the logic switch module 130 outputs first switch signals and second switch signals to the energy conversion sheet driving module 140 to control the vibration of the energy conversion sheet in the cleaning unit, so that circular cleaning is realized, and the cleaning effect is obvious. Meanwhile, the camera is separated from the cleaning unit, so that the camera is isolated from the outside, and the installation is convenient.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.