• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    CLEANING DEVICE FOR VEHICLE MOUNTED CAMERA AND METHOD OF CLEANING VEHICLE MOUNTED CAMERA. A nozzle (7) is provided for cleaning a lens surface (1a) of a camera (1), the nozzle (7) includes a cleaning liquid path (11a), (11b) which guides a cleaning liquid to a discharge passage (10a), (10b) and an air passage (12) which guides a compressed air to an discharge passage (10a), (10b). In addition, a distal end portion of the cleaning liquid path and a distal end portion of the air passage are arranged to be close together, or are arranged to blend with each other. Then, at the time of cleaning the lens surface (1a), compressed air is ejected intermittently from the discharge passage, and the cleaning liquid is pulled in with the negative pressure that occurs due to the ejection of compressed air to make the liquid is intermittently ejected from the discharge passage, thus cleaning the cleaning surface (1a).
    公开号:BR112015000243B1
    申请号:R112015000243-9
    申请日:2013-07-09
    公开日:2021-07-13
    发明作者:Toshimichi Gokan
    申请人:Nissan Motor Co., Ltd；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [001] The present invention relates to a cleaning device for cleaning a vehicle mounted camera, for example, on the back of a vehicle to capture images from the rear of the vehicle, and a method of cleaning the camera mounted on the vehicle. vehicle. FUNDAMENTALS OF THE TECHNIQUE
    [002] For a vehicle-mounted camera that is mounted, for example, on the back of a vehicle and captures images of the surroundings to monitor a vehicle that is moving behind the vehicle or obstacles in the vicinity of the vehicle, external substances such as water droplets and mud can cling to a lens that serves as a surface for capturing images during, for example, rainy weather. In this case, the vehicle mounted camera cannot clearly capture the image of the surroundings. In this regard, there is a known device for cleaning a vehicle-mounted camera lens described, for example, in Patent Document 1. With the cleaning device disclosed in Patent Document 1, a cleaning liquid is sprayed onto the surface. of the camera lens, and then highly pressured air is sprayed to remove the external substances stuck to the lens. LIST OF QUOTES PATENT DOCUMENTS
    [003] Patent Document 1: Japanese Patent Publication Publicly Available JP 2001-171491 SUMMARY OF THE INVENTION TECHNICAL PROBLEM.
    [004] However, the conventional example disclosed in Patent Document 1 described above requires a large amount of cleaning liquid to be sprayed onto the lens surface, causing the problem of consuming the large amount of cleaning liquid.
    [005] The present invention was carried out to solve the problem of the conventional technique as described above, and an objective of the present invention is to provide a cleaning device for a vehicle-mounted camera, which can guaranteed to clean the lens surface with a small amount. of cleaning liquid. SOLUTION TO THE PROBLEM
    [006] To achieve the objective described above, the cleaning device for a vehicle-mounted camera according to the present application includes: a nozzle having a discharge passage for discharging a cleaning liquid and compressed air and which is arranged to so as to face a surface of the camera lens, having a cleaning liquid path that guides the cleaning liquid to the discharge passage and an air passage that guides the compressed air to the discharge passage; a cleaning liquid sending section which sends the cleaning liquid through a cleaning liquid pipe to the nozzle; and a compressed air sending section that sends compressed air through an air pipe to the mouthpiece, wherein the lens surface is cleaned by driving the cleaning liquid sending section and intermittently driving the cleaning liquid sending section. compressed air several times to make the cleaning liquid and compressed air jet out of the discharge passage.
    [007] Furthermore, the cleaning device for a vehicle-mounted camera according to the present application includes a nozzle having a discharge passage through which cleaning liquid and compressed air are discharged and which is arranged so as to face to a lens surface of a camera mounted on a vehicle, wherein a distal end portion of a cleaning liquid path guides cleaning liquid to the discharge passage and a distal end portion of an air passage that guides the compressed air to the discharge passage are arranged to be close to each other, or are arranged to combine with one another, and the cleaning device cleans with a continuous water supply mode in the which cleaning liquid is sent, and compressed air is intermittently sent several times to cause the cleaning liquid and compressed air to jet out of the discharge passage. BRIEF DESCRIPTION OF THE DRAWINGS
    [008] Figure 1 is a block diagram illustrating a configuration of a cleaning device for a vehicle-mounted camera according to an embodiment of the present invention.
    [009] Figures 2(a) and 2(b) are perspective views, each illustrating a cleaning device configuration for a vehicle-mounted camera according to the embodiment of the present invention in which Figure 2(a) is a perspective view illustrating the cleaning device according to this embodiment in a state where the device is installed in a camera mounted on the back of a vehicle, and Figure 2(b) is a diagram illustrating the cleaning device. cleaning illustrated in Figure 2(a) when viewed from the “A” direction.
    [010] Figure 3 is a partially cut-away perspective view illustrating a nozzle unit provided for the cleaning device for a vehicle-mounted camera according to an embodiment of the present invention.
    [011] Figures 4(a) and 4(b) are sectional views, each illustrating a distal end portion of the cleaning device for a vehicle-mounted camera according to an embodiment of the present invention, in which the Figure 4(a) is an exploded view illustrating the distal end portion of the mouthpiece, and Figure 4(b) is a sectional view illustrating a portion of a reference signal P1 in Figure 4(a).
    [012] Figure 5 is an explanatory view illustrating an arrangement relationship between the camera and the distal end portion of the nozzle provided for the cleaning device for a vehicle-mounted camera according to the embodiment of the present invention.
    [013] Figures 6(a) and 6(b) are diagrams, each illustrating a cleaning device configuration for a vehicle-mounted camera according to the embodiment of the present invention, in which Figure 6(a) is a perspective view illustrating the cleaning device according to this embodiment in a state where the device is installed in a camera mounted on the back of a vehicle, and Figure 6(b) is a sectional view illustrating a cleaning unit. nozzle taken along a DD line illustrated in Figure 6(a).
    [014] Figure 7 is a block diagram illustrating a detailed configuration of a cleaning device controller for a vehicle mounted camera according to the embodiment of the present invention.
    [015] Figure 8 is a flowchart showing process procedures performed by the cleaning device for a vehicle mounted camera according to the embodiment of the present invention.
    [016] Figures 9(a) and 9(b) are time graphs, each showing processes in a pressure cleaning mode performed by the cleaning device for a vehicle-mounted camera according to the embodiment of the present invention, in which Figure 9(a) is a time graph showing an operation of a cleaning liquid pump, and Figure 9(b) is a time graph showing an operation of an air pump.
    [017] Figures 10(a) and 10(b) are time graphs, each showing processes in an air blast mode performed by the cleaning device for a vehicle-mounted camera according to the embodiment of the present invention, in which Figure 10(a) is a time graph showing a cleaning liquid pump operation, and Figure 10(b) is a time graph showing an air pump operation.
    [018] Figures 11(a) and 11(b) are time graphs, each showing processes in a continuous water supply mode performed by the cleaning device for a vehicle-mounted camera in accordance with the embodiment of the present invention , in which Figure 11(a) is a time graph showing an operation of a cleaning liquid pump, and Figure 11(b) is a time graph showing an air pump operation. DESCRIPTION OF MODALITIES
    [019] In the following, an embodiment according to the present invention will be described with reference to the drawings. Figure 1 is a block diagram illustrating a cleaning device configuration for a vehicle mounted camera in accordance with an embodiment of the present invention. As illustrated in Figure 1, a cleaning device 100 in accordance with this embodiment includes a cleaning liquid reservoir tank 2 (main tank) which stores a cleaning liquid, a cleaning liquid pump 3 (liquid sending section of cleaning liquid) that sends the cleaning liquid stored in the cleaning liquid reservoir tank 2, an air pump 5 (compressed air sending section) that sends compressed air, and a nozzle 7 to discharge the cleaning liquid, the compressed air, or a mixture of cleaning fluid and compressed air for a camera lens surface 1.
    [020] Furthermore, there is provided a cleaning liquid pipe 4 which guides the cleaning liquid sent by the cleaning liquid pump 3 to a secondary tank 13 which stores the cleaning liquid, an air pipe 6 which guides the air compressed sent by the air pump 5 to the nozzle 7 of a nozzle unit 22, and a controller 8 (control section) which controls operations of the cleaning liquid pump 3 and the air pump 5.
    [021] Figure 2(a) is a perspective view illustrating the cleaning device 100 according to this embodiment in a state where the device is installed in a camera 1 mounted on the back of a vehicle, and Figure 2(b) is a diagram illustrating the cleaning device 100 illustrated in Figure 2(a) when viewed from direction "A". As illustrated in Figure 2(a), the nozzle assembly 22 which is attached to the rear of the vehicle and cleans a lens surface 1a is provided in the vicinity of a side portion of the camera 1 attached to the rear of the vehicle. The nozzle assembly 22 includes the nozzle 7 from which a cleaning liquid and compressed air are discharged towards the lens surface 1a, and a cap 7d. As illustrated in Figure 2(b), the nozzle 7 has a distal end portion provided with two discharge passages 10a and 10b through which cleaning liquid and compressed air are discharged. In other words, the configuration is made so that, by discharging the cleaning liquid and compressed air from the discharge passages 10a and 10b of the nozzle 7 towards the lens surface 1a, external substances adhered to the lens surface 1a are removed.
    [022] Figure 3 is a partially cut-away perspective view illustrating the nozzle assembly 22 illustrated in Figure 2(a). As illustrated in Figure 3, the mouthpiece 7 provided at the distal end side of the mouthpiece assembly 22 has the central portion provided with an air passage 12 which guides the compressed air, and at both ends on the left and right sides thereof. air passage 12, cleaning liquid paths 11a and 11b are provided which guide the cleaning liquid. Furthermore, the distal end of the air passage 12 and the cleaning liquid paths 11a and 11b are individually bent at a substantially right angle so as to face the lens surface 1a of the camera 1.
    [023] Furthermore, a secondary tank 13 that temporarily stores the cleaning liquid is provided upstream of the cleaning liquid paths 11a and 11b. On the side of this secondary tank 13, a plug 13a is provided to connect to the cleaning liquid pipe 4 and a plug 13b to connect to the air pipe 6. Of these plugs, the plug 13b is connected with the passage of air 12 through a flow path provided below the secondary tank 13. In other words, the compressed air guided through the plug 13b to the nozzle unit 22 is taken directly into the air passage 12.
    [024] Furthermore, the plug 13a is connected to the secondary tank 13, and the cleaning liquid supplied therethrough the plug 13a is taken into the secondary tank 13 from above. In this case, the pipe extending from the plug 13a and connected to the secondary tank 13 is disposed in the vertical direction as indicated by the reference sign 23 in Figure 6(b). Details of this 23rd pipe will be described later.
    [025] Furthermore, as illustrated in Figure 3, the bottom portion of the secondary tank 13 is connected to two lines of the cleaning liquid paths 11a and 11b, and is arranged in a higher position than the discharge passages 10a and 10b. Thus, the compressed air sent by the air pump 5 illustrated in Figure 1 is drawn into the air passage 12 of the nozzle 7 through the air pipe 6, while the cleaning liquid sent by the liquid pump 3 is stored in the tank. secondary 13, and then is taken into the two lines of the cleaning liquid paths 11a and 11b. In addition, the secondary tank 13 has a smaller volume than the cleaning liquid reservoir tank 2 illustrated in Figure 1.
    [026] Figure 4(b) is an explanatory view illustrating a detailed configuration of the distal end portion of the mouthpiece, and is a sectional view illustrating a portion of the reference signal P1 in Figure 4(a). As illustrated in Figure 4(b), at the distal end portion of the nozzle 7, the air passage 12 is provided in the center, and the two cleaning liquid paths 11a and 11b are provided to be located on both sides. of the air passage 12. In other words, the cleaning liquid paths according to this embodiment are formed by two lines of the cleaning liquid paths 11a and 11b provided to be located on both sides of this air passage 12 .
    [027] The cleaning liquid paths 11a and 11b are connected to distal end portions 15a and 15b, respectively. In that case, the area of a flow path of each of the distal end portions 15a and 15b is less than the area of a flow path of each of the cleaning liquid paths 11a and 11b. Thus, the velocity of the cleaning liquid flowing through each of the cleaning liquid paths 11a and 11b increases as it flows through each of the distal end portions 15a and 15b.
    [028] On the other hand, the distal end of the air passage 12 is bifurcated into two distal end portions 14a (first distal end portion) and 14b (second distal end portion). In that case, the area of a flow path of each of the distal end portions 14a and 14b is smaller than the area of a flow path of the air passage 12. air 12 increases as it flows through each of the distal end portions 14a and 14b.
    [029] Furthermore, the distal end portion 15a of the cleaning liquid path 11a, which is one side, combines with a distal end portion 14a of the air passage 12 to form a combined flow path 16a (first combined flow path), the distal end of which forms the discharge passage 10a (see Figure 2(b)). Furthermore, the distal end portion 15b of the cleaning liquid path 11b, which is the other side, combines with the other distal end portion 14b of the air passage 12 to form a combined flow path 16b (second path of combined flow), the distal end of which forms the discharge passage 10b (see Figure 2(b)). In that case, the combined flow path 16a and the combined flow path 16b are arranged in such a way that the distance between the two paths increases towards the distal end of them.
    [030] With this configuration, since the cleaning liquid sent by the cleaning liquid pump 3 illustrated in Figure 1 is stored in the secondary tank 13, and the compressed air is sent by the air pump 5, the compressed air exits in jet shape at an increased velocity, and with the compressed air jet, the secondary tank 13 and the cleaning liquid paths 11a and 11b are constructed having a negative pressure to pull the cleaning liquid stored in the secondary tank 13. Thus, compressed air and cleaning liquid pass through the two combined flow paths 16a and 16b, jet out through the discharge passages 10a and 10b, and are sprayed onto the lens surface 1a. At this point, the liquid, which is a mixture of cleaning liquid and compressed air, jets out in a direction that spreads outwards as illustrated in Figure 5, whereby it is possible to clean the entire lens surface 1a.
    [031] In addition, as illustrated in Figure 4(b), a jet emission surface 7a, which is a distal end portion of the nozzle 7, is configured to protrude further ahead than a side surface 7b (a surface of distal end of the nozzle) in the vicinity of the jet emission surface 7a. This configuration makes it possible to prevent the cleaning liquid which jets out of the discharge passages 10a and 10b from getting stuck on the side surface 7b of the nozzle 7. More specifically, it is possible to prevent the cleaning liquid from getting stuck in areas indicated by reference signals P2 and P3 in Figure 5.
    [032] Figure 6(b) is a sectional view illustrating the nozzle assembly 22 illustrated in Figure 6(a) and taken along line D-D. As illustrated in Figure 6(b), a small space is provided between a bottom surface 7c of the mouthpiece 7 and an upper surface 1b of the camera body 1. Furthermore, the width of this space is configured to be gradually narrower. towards the inside of the space. With such a configuration, even if the cleaning liquid enters the space between the bottom surface 7c of the nozzle 7 and the upper surface 1b of the camera body 1, this cleaning liquid is gradually pushed into the space portion. between the nozzle 7 and camera 1 due to surface tension, and is externally released from the left and right sides of camera 1 when viewed from the front. In other words, with the existence of the small space between the bottom surface 7c of the mouthpiece 7 and the top surface 1b of the camera body 1, it is possible to avoid a problem such as a cleaning liquid remaining and hardening.
    [033] Furthermore, as illustrated in Figure 6(b), a supply passage 13c for supplying the cleaning liquid to the interior of the secondary tank 13 is provided in the upper interior of the secondary tank 13 provided upstream of the nozzle 7, and for that supply passage 13c, the pipe 23 placed in the vertical direction is provided. Then, this pipe 23 is connected to the plug 13a shown in Figure 3. With the pipe 23 being placed in the vertical direction, it is possible to prevent the cleaning liquid from remaining in the path by irregularly entering the secondary tank 13 in the event that the supply of the cleaning liquid by cleaning liquid pump 3 (see Figure 1) is stopped. In other words, it is possible to prevent the cleaning liquid from entering the secondary tank 13 due to vibration in a state in which the secondary tank 13 is empty.
    [034] In addition, a check valve 24 is provided on the upper surface of the secondary tank 13. The check valve 24 is, for example, an umbrella valve, and is configured so that if the pressure within the secondary tank 13 becomes negative pressure, the valve is opened to introduce outside air through an air exhaust 25, and if the pressure inside secondary tank 13 becomes positive pressure, the valve is closed to prevent release to the outside . Thus, if the secondary tank 13 assumes negative pressure, the outside air enters the secondary tank 13, whereby it is possible to prevent the cleaning liquid from entering through the cleaning liquid pipe 4. In other words, the secondary tank has the check valve that prevents air from leaking out of the secondary tank 13, and allows air to enter the secondary tank 13 from outside.
    [035] Furthermore, as illustrated in Figure 6(b), the bottom surface 13d of the secondary tank 13 is inclined so as to descend towards the front side (left side in the drawing). Furthermore, an outlet pipe from the secondary tank 13, as well as the cleaning liquid paths 11a and 11b and the air passage 12 (see Figure 3) provided for the nozzle 7 are similarly configured to be inclined to descend into the direction from the front side. With these configurations, the cleaning liquid stored in the secondary tank 13 does not remain in a certain location, and the slope in each of the portions causes the cleaning liquid to reliably flow towards the downstream side.
    [036] Next, detailed configurations of a controller 8 (control section) illustrated in Figure 1 will be described with reference to the block diagram illustrated in Figure 7. As illustrated in Figure 7, controller 8 is connected to a control unit provided to a vehicle, obtains various pieces of information about the vehicle, including vehicle speed information 31, windshield wiper switch information 32, washer switch information 33, shift position information 34, and information about the beacon switch 35, and further obtains information about camera image 41, which is an image captured by camera 1.
    [037] In addition, the controller 8 includes a dirt state determiner 55 (dirt state determination section) which determines, based on the image information of the camera 41, whether the lens surface 1a of the camera 1 becomes dirty. , and a cleaning operation determinant 51 which determines a cleaning mode (which will be specifically described below) for the lens surface 1a based on various pieces of information about the vehicle. Furthermore, the controller 8 includes an air pump drive unit 52 which controls the operation of the air pump 5 based on the cleaning mode determined by the cleaning operation determiner 51, a cleaning liquid pump drive unit 53 which controls the operation of the cleaning liquid pump 3, and a notification unit 54 which transmits a notification signal when something abnormal occurs in a cleaning operation. Furthermore, the controller 8 is connected to an alarm unit 61 which notifies the occurrence of alarm when the notification unit 54 transmits the notification signal.
    [038] In the following, a description of types of cleaning modes configured appropriately will be made according to the results of the determination performed by the cleaning operation determinant 51. In this mode, there are three modes including a cleaning mode with pressure in which the liquid cleaning and compressed air are blown out to clean the surface of lens 1a, an air blast mode in which only compressed air is released to remove water droplets trapped on the surface of lens 1a, and a continuous water supply mode in which cleaning liquid is intermittently dripped onto the lens surface 1a to make it difficult for dirt to stick to the lens surface 1a. Any of these three modes is appropriately selected according to various conditions, such as lens surface dirt states 1a and weather conditions, and is performed to effectively clean camera 1.
    [039] First, the pressure cleaning mode will be described. In pressure cleaning mode, with control by the cleaning liquid pump drive unit 53 illustrated in Figure 7, the cleaning liquid pump 3 is activated for a short period of time to store the cleaning liquid in the tank secondary 13, and at the same time with control made by the air pump drive unit 52, the air pump 5 is driven. More specifically, as illustrated in Figure 9(a) and Figure 9(b), both the cleaning liquid pump 3 and the air pump 5 are activated at an instant t0.
    [040] Then, during a time period of t0 to t1 (eg 200ms), the cleaning liquid stored in the cleaning liquid reservoir tank 2 (main tank) is supplied through the cleaning liquid pipe 4 to the secondary tank 13, and the cleaning liquid is stored in this secondary tank 13. Note that the time period t0 to t1 is set to be a period of time required to completely fill the secondary tank 13 with the cleaning liquid. by the cleaning liquid pump 3.
    [041] In addition, the compressed air sent by the air pump 5 passes through the air pipe 6, and is introduced into the air passage 12 inside the nozzle 7 illustrated in Figure 3. Next, the compressed air is sent from the portions of distal end 14a and 14b illustrated in Figure 4(b) for the combined flow paths 16a and 16b. At this time, as the flow path area of each of the distal end portions 14a and 14b is adjusted to be less than that of the air passage 12, the air flow velocity increases in each of the distal end portions 14a and 14b. This causes the distal end portions 15a and 15b of the cleaning liquid paths 11a and 11b located upstream of the combined flow paths 16a and 16b to present negative pressure to draw in the cleaning liquid stored in the secondary tank 13, and the cleaning liquid drawn passes through cleaning liquid paths 11a and 11b, and enters combined flow paths 16a and 16b. In other words, using the reduction in pressure in the secondary tank 13 due to the compressed air air flow, the cleaning liquid from the secondary tank 13 is pulled to pass through the cleaning liquid paths 11a and 11b, and made the cleaning liquid enters the combined flow paths 16a and 16b.
    [042] As a result, together with the compressed air, the cleaning liquid jets out of the combined flow paths 16a and 16b in the form of a mist. Thus, the cleaning liquid in mist form can be jetted out of the discharge passages 10a and 10b which serve as the distal ends of the combined flow paths 16a and 16b, and be sprayed onto the lens surface 1a . This makes it possible to remove the external substance stuck on the lens surface 1a with the synergistic effect of the cleaning liquid in the form of a mist and with air pressure.
    [043] Furthermore, after the cleaning liquid inside the secondary tank is ejected, and all the cleaning liquid is consumed in a time t2 shown in Figure 9(b), only the compressed air is ejected during a period of time of t2 to t3, whereby water droplets clinging to the surface of lens 1a can be removed with this compressed air.
    [044] In other words, the pressure cleaning mode is a mode in which the air pump 5 (compressed air delivery section) is activated; the compressed air is driven out in jet form through the discharge passages 10a and 10b; the cleaning liquid supplied to the cleaning liquid paths 11a and 11b is drawn in by the negative pressure that occurs as a result of the compressed air jet to eject the cleaning liquid through the discharge passages 10a and 10b; and the lens surface 1a is cleaned with compressed air and ejected cleaning liquid. By activating the cleaning liquid pump 3 (cleaning liquid sending section) and by continuously sending compressed air through the air pump 5 (compressed air sending section), the cleaning liquid and compressed air are brought to out continuously in jet form through the discharge passages 10a and 10b. With the compressed air jet, the cleaning liquid path is put into negative pressure so that the cleaning liquid takes the form of a mist and is ejected, so that the lens surface can be efficiently cleaned with the small amount of cleaning liquid. This pressure cleaning mode is suitable for applications that remove external substances such as mud stuck to the lens surface 1a.
    [045] In addition, by increasing the time period to activate the cleaning liquid pump 3 shown in Figure 9(a) (for example, by setting the time period from t0 to t1 to 400ms), it is possible to push the cleaning liquid stored in the secondary tank 13 by the pressure of the cleaning liquid pump 3, and the cleaning liquid under pressure can be supplied to the cleaning liquid paths 11a and 11b, whereby it is possible to clean the lens surface 1a with a high blood pressure.
    [046] Next, the air blast mode will be described. In air blast mode, the air pump drive unit 52 illustrated in Figure 7 is controlled in a state where the cleaning liquid is not stored in the secondary tank 13, and only the air pump 5 is driven. More specifically, the cleaning liquid pump 3 is turned off as illustrated in Figure 10(a), and the air pump 5 is actuated for a period of time from t10 to t11 (eg two seconds) as illustrated in Figure 10 (B). Compressed air then passes through the distal end portions 14a and 14b of the air passage 12 and the combined flow paths 16a and 16b to jet out of the discharge passages 10a and 10b, and be sprayed onto the surface of lens 1a. The result is that water droplets trapped on the lens surface 1a of camera 1 can be removed by air pressure.
    [047] At this time, the pipe 23 connected to the secondary tank 13 is placed in a substantially vertical direction as illustrated in Figure 6(b). Furthermore, the bottom surface 13d of the secondary tank 13 is placed in a position that is higher than the discharge passages 10a and 10b, and the bottom surface 13d of the secondary tank 13 and the pipe for the cleaning liquid are inclined. downwards, so that the cleaning liquid does not remain in the secondary tank 13 and its pipe. Thus, even in the case where the compressed air comes out as a jet, and the interior of the secondary tank 13 is at negative pressure, it is possible to prevent the cleaning liquid from being introduced into the combined flow paths 16a and 16b, and it is possible prevent the cleaning liquid from mixing with compressed air. This makes it possible to prevent a problem from occurring because the cleaning liquid mixed with the compressed air gets stuck on the lens surface 1a at the time of ejecting the compressed air to remove the drop of water stuck on the lens surface 1a. In other words, the air blast mode is a mode in which the sending of cleaning liquid by the cleaning liquid pump 3 (cleaning liquid sending section) is stopped; and the compressed air is jetted out through the discharge passages 10a and 10b, whereby the lens surface 1a is cleaned. The air blast mode is suitable for removing water droplets stuck on the 1a lens surface.
    [048] Next, the continuous water supply mode will be described. In continuous water supply mode, the cleaning liquid is supplied by the cleaning liquid pump 3 into the secondary tank 13 through the cleaning liquid pump drive unit 53, and the cleaning liquid is dripped onto the surface. of lens 1a by intermittent actuation of air pump drive unit 5 through control by air pump drive unit 52. More specifically, as illustrated in Figure 11(a) and Figure 11(b), the cleaning liquid is stored in secondary tank 13 by driving the cleaning liquid pump 3 for a period of time t20 to t21, and then, at a time t22, the air pump 5 is intermittently actuated several times within a time period T1. whereby a small amount of cleaning liquid is dripped onto the lens surface 1a. For example, by setting the time period from t22 to t23 to 30ms, the small amount (eg 0.25cm3) of cleaning liquid is dripped onto the surface of lens 1a with each drop.
    [049] The result is that it is possible to always keep the lens surface 1a in a wet state, and it is possible to avoid the deposition of contaminants contained in the drop of water splashed by the vehicle in rainy weather. In other words, the continuous water supply mode is a mode in which compressed air is intermittently jetted through the discharge passages 10a and 10b for several times, and the cleaning liquid is drawn in with negative pressure which it happens due to the fact that the compressed air jet causes the cleaning liquid to be ejected through the discharge passages 10a and 10b on the lens surface 1a. This continuous water supply mode is suitable for keeping the lens surface 1a in the wet state when the weather is rainy to prevent contaminants from depositing on the lens surface 1a before this happens.
    [050] The following will describe operations of cleaning device 100 for a vehicle-mounted camera according to this modality having the configuration described above with reference to the flowchart shown in Figure 8. Figure 8 shows process procedures performed by the controller 8 , which are performed for each predetermined calculation cycle. First, in step S1, the cleaning operation determinant 51 of the controller 8 obtains several pieces of information about the vehicle to which that cleaning operation determinant 51 belongs. In other words, it gets various pieces of information about the vehicle 30 shown in Figure 7, more specifically, it gets the speed information of the vehicle 31, the information about the switch of the windshield wiper 32, the information about the switch of washer 33, shift position information 34, and headlamp switch information 35.
    [051] In step S2, the dirt state determiner 55 of controller 8 acquires the camera image information 41.
    [052] In step S3, the dirt state determiner 55 determines based on a camera image whether the lens surface 1a is dirty. Determining whether the lens surface 1a is dirty can be made by applying predetermined image processing to a captured image, and determining whether there is any portion where the light is blocked. In addition, the determination of dirt on the lens surface 1a can be done by determining whether it is day or night based on information about the headlamp switch 35, and changing a condition for the dirt determination, whether day or night . With the processes described above, it is possible to carry out a dirt determination more accurately. If there is dirt ("YES" in step S3), the process continues to step S4, while if there is no dirt ("NO" in step S3), the process continues to step S7.
    [053] If it is determined in the process of step S3 that there is dirt ("YES" in step S3), the cleaning operation determinant 51 determines in step S4 whether the number of times of cleaning with pressure in the past is less than a number of times limit determined in advance (eg three times). Furthermore, if the number of pressure cleaning times in the past is less than the number of times threshold (YES in step S4), the cleaning operation determinant 51 cleans the lens surface 1a with the pressure cleaning mode in step S5. More specifically, the air pump 5 is driven by the air pump drive unit 52, and the cleaning liquid pump 3 is driven by the cleaning liquid pump drive unit 53, whereby the cleaning liquid and the Compressed air is driven out in jet form through the discharge passages 10a and 10b of the nozzle 7 to clean the dirt stuck on the lens surface 1a in the pressure cleaning mode.
    [054] On the other hand, if the number of pressure wipes in the past is greater than or equal to the threshold number of times (NOT in step S4), it can be determined that dirt on lens surface 1a cannot be removed even if the cleaning is carried out the limited number of times with the pressure cleaning mode, and thus, in step S6, an alarm signal is issued by the notification unit 54. With this operation, an alarm is issued by the alarm unit 61, so it is possible to make a driver aware that the dirt on the lens surface 1a is not removed.
    [055] Furthermore, if it is determined in the process of step S3 that the lens surface 1a is not dirty (NOT in step S3), it is determined in step S7 whether it is raining or not. This process is carried out, for example, based on information about the windshield wiper switch 32 so that if a windshield wiper is in operation, it is determined that it is raining. So, if it is determined that it is not raining (NOT in step S7), the process continues to step S8, while if it is determined that it is raining (YES in step S7), the process proceeds to step S11.
    [056] If it is determined in the process of step S7 that it is not raining (NOT in step S7), the cleaning operation determinant 51 obtains, in step S8, the frequency of air gusts according to the speed of the vehicle. More specifically, data indicating a relationship between vehicle speed and frequency of wipes with the air blast mode is stored in a memory or the like (not shown) of the controller 8, and when the vehicle speed information 31 is shown in Figure 7 is obtained with reference to the data, the frequency of cleanings with the air blast mode corresponding to that information about that vehicle speed is adjusted. For example, the frequency corresponding to the highest vehicle speed is set to a two-second interval as the highest frequency; the frequency at the moment when the vehicle is stationary is set in a two-minute interval as the lowest frequency; and velocities between them are interpolated by straight lines to obtain frequencies. In other words, the frequency of cleanings with the air blast mode is adjusted to increase with increasing vehicle speed.
    [057] In addition, in step S9, the cleaning operation determinant 51 detects the amount of water droplets caught on the lens surface 1a, and corrects the frequency of cleanings with the air blast mode according to the amount of drops. More specifically, the frequency of cleanings with the air blast mode is corrected by setting a coefficient to “1” in the case where the water droplets caught on the lens surface 1a have a standard size, setting the coefficient to a value greater than or equal to one in the case where the trapped water drops have a size greater than the standard size, and adjusting the coefficient to a value less than or equal to one in the case where the trapped water drops have a smaller size than the standard size.
    [058] Then, in step S10, with the cleaning operation determinant 51, the lens surface 1a is cleaned with the air blast mode. More specifically, a control instruction is issued to the air pump drive unit 52, whereby the air pump 5 is driven to deliver compressed air. With this operation, compressed air passes through the distal end portions 14a and 14b of the air passage 12 to jet out through the discharge passages 10a and 10b, whereby it is possible to spray compressed air onto the lens surface 1a to remove water droplets stuck to this lens surface 1a. This cleaning with air blast mode is performed repeatedly over time intervals set according to the set frequency.
    [059] On the other hand, if it is determined in the process of step S7 that it is raining (YES in step S7), the cleaning operation determinant 51 obtains, in step S11, the frequency of drops of the cleaning liquid according to the vehicle speed. More specifically, data indicating a relationship between vehicle speed and frequency of cleaning with the continuous water supply mode is stored in a memory (not shown) or the like of the controller 8, and when vehicle speed information 31 is shown in Figure 7 is obtained, the frequency of cleanings with continuous water supply mode corresponding to that vehicle speed information is adjusted with reference to the data. For example, the frequency corresponding to the highest speed is set with an interval of 10 seconds being the highest frequency; the frequency at the time the vehicle stops is set with a 20 second interval being the lowest frequency; and velocities between them are interpolated by straight lines to obtain frequencies. In other words, the frequency of cleanings with continuous water supply mode is adjusted to increase with increasing vehicle speed.
    [060] In addition, in step S12, the cleaning operation determinant 51 detects the amount of water droplets caught on the lens surface 1a, and corrects the frequency of cleanings with the continuous water supply mode in accordance with the amount of water drops. More specifically, the frequency of cleanings with the continuous water supply mode is corrected by setting a coefficient to “1” in the case where the water droplets caught on the lens surface 1a have a standard size, adjusting the coefficient to a value greater than or equal to one in the case where the trapped water drops have a size greater than the standard size, and adjusting the coefficient to a value less than or equal to one in the case where the trapped water drops have a size smaller than the standard size.
    [061] Then, in step S13, with the cleaning operation determinant 51, the lens surface 1a is cleaned with the continuous water supply mode. With this operation, it is possible to eject the cleaning liquid through the discharge passages 10a and 10b and pour the cleaning liquid onto the lens surface 1a, whereby it is possible to effectively prevent dirt from getting stuck on this lens surface 1a. This cleaning with continuous water supply mode is performed repeatedly at time intervals set according to the set frequency.
    [062] As described above, various types of cleaning modes are selected as appropriate according to dirt states of the lens surface 1a, and weather conditions with respect to whether it is raining or not, whereby it is possible to clean the lens surface 1a camera 1 with an optimal cleaning mode appropriate for the condition at that time.
    [063] It should be noted that, in the process described above, it may be possible to obtain the current gear position based on the information on shift position 34, and operate with each of the cleaning modes only at the time of range D (range of direction) and at a predetermined speed (eg 30km/h) or higher.
    [064] As described above, in cleaning device 100 for a vehicle-mounted camera in accordance with this embodiment, the air passage 12 is provided for the distal end portion of the mouthpiece 7; the cleaning liquid paths 11a and 11b are provided in the vicinity of this air passage 12 and the distal end portions 14a and 14b of the air passage 12 and the distal end portions 15a and 15b of the cleaning liquid paths 11a and 11b are combined with each other. Thus, by employing the continuous water supply mode in which the air pump 5 is actuated intermittently several times (for example, four times) to supply compressed air for the air passage 12 in a state in which the liquid cleaning liquid is stored in the secondary tank 13 by driving the cleaning liquid pump 3, and by ejecting the compressed air from the distal end portions 14a and 14b, it is possible to make the cleaning liquid paths 11a and 11b with negative pressure to pull cleaning liquid from secondary tank 13, and intermittently eject cleaning liquid through the combined flow paths 16a and 16b. By reducing the particle size of the cleaning liquid with movement and ejecting the same, it is possible to efficiently clean the lens surface 1a with the small amount of cleaning liquid.
    [065] In addition, it is possible to wet the lens surface 1a with the cleaning liquid, whereby it is possible to make it difficult for dirt to stick to the lens surface 1a. Furthermore, as the cleaning liquid stored in the secondary tank 13 is supplied intermittently, it is possible to reduce the amount of cleaning liquid used for cleaning.
    [066] Furthermore, by employing the continuous water supply mode when it is raining to eject the cleaning liquid onto the surface of lens 1a, it is possible to prevent dirt from getting stuck on the surface of lens 1a due to, for example, a splash of mud or rainwater. Furthermore, with the increase in vehicle speed, the frequency of continuous water supply increases, and thus it is possible to properly eject the cleaning liquid according to speed.
    [067] Also, by activating the air pump 5 in a state where the cleaning liquid is stopped, it is possible to eject the compressed air with the air blast mode, whereby it is possible to remove the water droplets stuck on the surface of lens 1a. So, by choosing the air blast mode when it is raining in a state where there is no dirt on the surface of lens 1a, even if rainwater splashes during the vehicle's journey, and gets stuck on the surface of lens 1a, it is possible safely remove trapped rainwater, and clearly capture images with camera 1. In addition, as vehicle speed increases, the frequency of cleaning with air blast mode increases. Thus, it is possible to properly remove water droplets according to speed.
    [068] In addition, by supplying compressed air to the air passage 12 to eject it from the distal end portions 14a and 14b, it is possible to realize the pressure cleaning mode in which the cleaning liquid paths 11a and 11b are placed under negative pressure to draw in the cleaning liquid, and the cleaning liquid is caused to combine with the compressed air in the combined flow paths 16a and 16b, and then be ejected onto the lens surface 1a. Thus, the cleaning liquid can be made in the form of a mist, and it is possible to reduce the amount of cleaning liquid needed for cleaning. Next, in the case where the lens surface 1a is dirty, cleaning is done with the pressure cleaning mode, and thus, in the case where the lens surface 1a is dirty, it is possible to clean and remove this dirt immediately .
    [069] Furthermore, in the case where the dirt cannot be removed even if the cleaning with the pressure cleaning mode is performed the predetermined number of times, an alarm is triggered, and thus, it is possible to warn a driver that the dirt is attached to the lens surface 1a.
    [070] Furthermore, in the cleaning device 100 for a vehicle-mounted camera according to this mode, since any of the pressure cleaning mode, the air blast mode, and the water supply mode continuous is selected depending on situations where cleaning of the lens surface 1a is required, it is possible to clean the lens surface 1a with an appropriate mode according to the situations under which one is driving.
    [071] These are descriptions of the cleaning device for a vehicle mounted camera according to the present invention based on the illustrated embodiment. However, the present invention is not limited to those described above, and it may be possible to replace the configuration of each unit with any given configuration that has a similar function.
    [072] For example, in the embodiment described above, descriptions have been made of an example in which an air passage line 12 and two lines of cleaning liquid trajectories are provided at the nozzle 7, and these are combined to form two lines of combined flow paths 16a and 16b. However, the present invention is not limited thereto, and it may be possible to employ a configuration in which one or more air passages and one or more cleaning liquid paths are combined in the distal end portion.
    [073] In addition, the modality described above employs the configuration in which compressed air and cleaning liquid are combined at the distal end portion of the nozzle 7. However, the present invention is not limited to this, and it is possible to employ a configuration in which the air passage and the cleaning liquid paths are arranged so as to be close to each other, and when the compressed air is discharged through the air passage, the cleaning liquid supplied by the cleaning liquid path is made in the form of mist using the negative pressure at this time, and thus ejecting it. In this case, the distal end portions 14a and 15a and the distal end portions 14b and 15b, each of which is illustrated in Figure 4(b), are not combined, and the jet is used in a state where they are. close to each other.
    [074] The present application claims as priority patent application JP 2012-155354 filed on July 11, 2012, the contents of which are fully incorporated herein by reference. INDUSTRIAL APPLICATION
    [075] The present invention can be used to effectively clean the lens surface of the vehicle mounted camera with a small amount of cleaning liquid. REFERENCE SIGNALS LIST 1 camera 1st lens surface 1b top surface 2 cleaning liquid reservoir tank (main tank) 3 cleaning liquid pump 4 cleaning liquid pipe 5 air pump 6 air pipe 7 nozzle 7a surface jet outlet 7b side surface (nozzle distal end surface) 7c bottom surface 7d cap 8 controller 10, 10b discharge passage 11a, 11b cleaning liquid path 12 air passage 13 secondary tank 13, 13b cap 13c passage supply 13d lower surface 14a, 14b distal end portion 15a, 15b distal end portion 16a, 16b combined flow path 22 nozzle unit 23 barrel 24 check valve 25 air exhaust 30 vehicle information 31 speed information vehicle 32 information about windshield wiper switch 33 information about washer switch 34 information about shift position 35 information about windshield switch headlamp 41 camera image information 51 cleaning operation determinant 52 air pump drive unit 53 cleaning liquid pump drive unit 54 notification unit 55 dirt status determinator 61 alarm unit 100 cleaning device
    权利要求:
    Claims (7)
    [0001]
    1. Cleaning device (100) for a vehicle-mounted camera (1), which cleans a lens surface (1a) of a camera (1) mounted on a vehicle, the cleaning device (100) comprising: a nozzle ( 7) having a discharge passage (10a, 10b) from which a cleaning liquid and compressed air are discharged and which is arranged to face the lens surface (1a), and having a liquid path of cleaning (11a, 11b) that guides cleaning liquid to the discharge passage (10a, 10b) and an air passage (12) configured to guide compressed air to the discharge passage (10a, 10b), wherein a a distal end portion (15a, 15b) of the cleaning liquid path (11a, 11b) and a distal end portion (14a, 14b) of the air passage (12) are arranged to be close together, or they are arranged to match one another; a cleaning liquid sending section (3) which sends the cleaning liquid through a cleaning liquid pipe (4) to the nozzle (7); a compressed air delivery section (5) which sends the compressed air through an air pipe (6) to the nozzle (7); and a control section (8) which controls the cleaning liquid sending section (3) and the compressed air sending section (5), the cleaning device (100) being CHARACTERIZED by the fact that the control section (8) performs cleaning with a continuous water supply mode in which the cleaning liquid sending section (3) is actuated and the compressed air sending section (5) is actuated intermittently for a plurality of times to do with that the cleaning liquid and compressed air jet out of the discharge passage (10a, 10b), whereby the cleaning liquid is dripped onto the lens surface (1a).
    [0002]
    2. Cleaning device (100) for a vehicle mounted camera (1), according to claim 1, CHARACTERIZED by the fact that in addition to the continuous water supply mode, the control section (8) performs cleaning with a air blast mode in which sending the cleaning liquid through the cleaning liquid sending section (3) is stopped, and compressed air being sent through the compressed air sending section (5) to cause the compressed air to exit in the form of a jet through the discharge passage (10a, 10b).
    [0003]
    3. Cleaning device (100) for a vehicle mounted camera (1), according to claim 2, CHARACTERIZED by the fact that in addition to the continuous water supply mode and the air blast mode, the control section (8) performs cleaning with a pressure cleaning mode in which the cleaning liquid sending section (3) is actuated and compressed air is continuously sent by the compressed air sending section (5) to make the liquid and the compressed air is continuously jetting out of the discharge passage (10a, 10b).
    [0004]
    4. Cleaning device (100) for a vehicle-mounted camera (1), according to claim 3, CHARACTERIZED by the fact that it further comprises a dirt state determination section (55) which determines a surface dirt state lens (1a), wherein the control section (8) cleans the lens surface (1a) with the pressure cleaning mode if the dirt state determination section (55) determines what dirt occurs.
    [0005]
    5. Cleaning device (100) for a vehicle mounted camera (1), according to claim 3, CHARACTERIZED by the fact that it further comprises a dirt status determination section (55) which determines a dirt status of the lens surface (1a), where the control section (8) determines if it is raining based on information from the vehicle (30), and cleans the lens surface (1a) with continuous water supply mode if the section The dirt state determination (55) determines that the lens surface (1a) is not dirty and the control section (8) determines that it is raining.
    [0006]
    6. Cleaning device (100) for a vehicle mounted camera (1), according to claim 3, CHARACTERIZED by the fact that it further comprises a dirt status determination section (55) which determines a dirt status of the lens surface (1a), where the control section (8) determines if it's raining based on information from the vehicle (30), and cleans the lens surface (1a) with the air blast mode if the Dirt state determination (55) determines that the lens surface (1a) is not dirty and the control section (8) determines that it is not raining.
    [0007]
    7. Method of cleaning a vehicle-mounted camera (1) using a cleaning device (100) as defined in any one of claims 1 to 6, CHARACTERIZED by the fact that it comprises: cleaning with a continuous water supply mode in which the cleaning liquid is sent to the nozzle (7), and compressed air is intermittently sent to the nozzle (7) a plurality of times to cause the cleaning liquid and compressed air to jet out. of a discharge passage (10a, 10b), wherein cleaning liquid is dripped onto the lens surface (1a).
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    同族专利:
    公开号 | 公开日
    RU2569981C1|2015-12-10|
    MX2015000272A|2015-04-10|
    JPWO2014010578A1|2016-06-23|
    EP2873572A1|2015-05-20|
    CN104470771B|2016-08-17|
    US9505382B2|2016-11-29|
    JP6090318B2|2017-03-08|
    BR112015000243A2|2019-10-08|
    US20150203077A1|2015-07-23|
    MX340630B|2016-07-19|
    EP2873572A4|2015-08-19|
    EP2873572B1|2017-05-10|
    CN104470771A|2015-03-25|
    MY154116A|2015-05-05|
    WO2014010578A1|2014-01-16|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-03-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-13| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/07/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012155354|2012-07-11|
    JP2012-155354|2012-07-11|
    PCT/JP2013/068715|WO2014010578A1|2012-07-11|2013-07-09|Vehicle-mounted-camera cleaning device, and vehicle-mounted-camera cleaning method|
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