Module housing, mirror replacement system, vehicle
20230311817 · 2023-10-05
Inventors
Cpc classification
B60S1/56
PERFORMING OPERATIONS; TRANSPORTING
B60R11/04
PERFORMING OPERATIONS; TRANSPORTING
B60S1/52
PERFORMING OPERATIONS; TRANSPORTING
B60R2300/8046
PERFORMING OPERATIONS; TRANSPORTING
International classification
B60S1/56
PERFORMING OPERATIONS; TRANSPORTING
B60S1/52
PERFORMING OPERATIONS; TRANSPORTING
Abstract
A module housing for a mirror replacement system includes a holder body which has at least one holder opening and at least one viewing opening of a camera mount for fastening a camera, wherein the at least one viewing opening enables a view for the camera from the module housing. The holder body furthermore has a retaining device for a cleaning arrangement, wherein the cleaning arrangement has at least one cleaning nozzle and one fluid line for a cleaning fluid with at least one line body, wherein the retaining device has: a line holder for the fluid line, a nozzle holder for the cleaning nozzle which is arranged in such a way that cleaning fluid can be applied from the cleaning nozzle to the at least one viewing opening.
Claims
1. A module housing for a mirror replacement system, the module housing comprising: a holder body defining at least one holder opening and at least one viewing opening of a camera mount for fastening a camera; said at least one viewing opening enabling a view for the camera from the module housing; said holder body further having a retaining device for a cleaning arrangement; wherein the cleaning arrangement has a cleaning nozzle and a fluid line for a cleaning fluid with at least one line body; said retaining device having a line holder for the fluid line and a nozzle holder for said cleaning nozzle; and, said nozzle holder being arranged such that the cleaning fluid can be applied from the cleaning nozzle to said at least one viewing opening.
2. The module housing of claim 1, wherein the cleaning nozzle is attached to the fluid line with a plug-in connection.
3. The module housing of claim 1, wherein said line holder has at least one of a line guide and a line retainer.
4. The module housing of claim 3, wherein at least one of: said line retainer is a line clip or a line retaining strap; and, said line guide is formed as a hollow channel in said holder body.
5. The module housing of claim 1, wherein a line connection is formed as a clamping bushing for the fluid line in said holder body.
6. The module housing of claim 1, wherein the fluid line has a compressed-air fluid line for compressed air.
7. The module housing of claim 1, wherein the fluid line has a liquid fluid line for a liquid.
8. The module housing of claim 1, wherein said retaining device has an actuator holder for a fluid actuator; and, said actuator holder has a retaining connection.
9. The module housing of claim 8, wherein said retaining connection is formed via a fastening clip or a retaining strap and said actuator holder is connected to the line guide.
10. The module housing of claim 8, wherein said fluid actuator is a valve, a quick air-release valve, a pressure cylinder, or a pump.
11. The module housing of claim 8, wherein said retaining connection has a fastening clip for fastening the fluid actuator.
12. The module housing of claim 8, wherein said retaining device has a holding feature configured to be brought into engagement with a positioning feature of an actuator housing.
13. The module housing of claim 3, wherein said line retainer is at least one of a single line retainer, double line retainer, a single line clip, and a double line clip.
14. A mirror replacement system for attachment to a vehicle, the mirror replacement system comprising: a module housing; a cleaning arrangement including a cleaning nozzle and a fluid line; said module housing including a holder body defining at least one holder opening and at least one viewing opening of a camera mount for fastening a camera; said at least one viewing opening enabling a view for the camera from said module housing; said holder body further having a retaining device for a cleaning arrangement; wherein the cleaning arrangement has a cleaning nozzle and a fluid line for a cleaning fluid with at least one line body; said retaining device having a line holder for said fluid line and a nozzle holder for said cleaning nozzle; said nozzle holder being arranged such that the cleaning fluid can be applied from said cleaning nozzle to said at least one viewing opening; and, said cleaning arrangement being held in said retaining device.
15. The mirror replacement system of claim 14, wherein said cleaning nozzle is a compressed air cleaning nozzle, a liquid cleaning nozzle, or a combination nozzle.
16. The mirror replacement system of claim 14 further comprising the camera being held in said camera mount of said holder body; and, said camera having a lens surface arranged in said viewing opening of said camera mount.
17. The mirror replacement system of claim 14, wherein: said cleaning arrangement has a quick air-release valve configured to receive compressed air and to supply a compressed-air cleaning pulse to said cleaning nozzle; and, said quick air-release valve is held in said retaining device.
18. The mirror replacement system of claim 17, wherein said quick air-release valve has a valve housing with a positioning feature in order to fix an actuator position of said valve housing relative to said module housing.
19. The mirror replacement system of claim 18, wherein said positioning feature is a positioning plug configured to be brought into contact engagement with a holding feature.
20. The mirror replacement system of claim 19, wherein said holding feature is a receiving plug connection of said holder body.
21. The mirror replacement system of claim 14 further comprising a fluid supply module configured to supply at least one of a compressed-air cleaning pulse, a stream of compressed air, a liquid cleaning pulse, and a stream of liquid.
22. A vehicle comprising: the module housing of claim 1; a compressed-air supply system for supplying compressed air; and, said module housing being arranged and configured such that the camera is arranged with a lens surface for an optical capture of an outside area of the mirror replacement system.
23. A vehicle comprising: a mirror replacement system for attachment to the vehicle; said mirror replacement system including a module housing and a cleaning arrangement; said cleaning arrangement including a cleaning nozzle and a fluid line; said module housing including a holder body defining at least one holder opening and at least one viewing opening of a camera mount for fastening a camera; said at least one viewing opening enabling a view for the camera from said module housing; said holder body further having a retaining device for a cleaning arrangement; wherein the cleaning arrangement has a cleaning nozzle and a fluid line for a cleaning fluid with at least one line body; said retaining device having a line holder for said fluid line and a nozzle holder for said cleaning nozzle; said nozzle holder being arranged such that the cleaning fluid can be applied from said cleaning nozzle to said at least one viewing opening; said cleaning arrangement being held in said retaining device a compressed-air supply system for supplying compressed air; and, said mirror replacement system being arranged and configured such that the camera is arranged with a lens surface for an optical capture of an outside area of said mirror replacement system.
Description
BRIEF DESCRIPTION OF DRAWINGS
[0052] The invention will now be described with reference to the drawings wherein:
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DETALLED DESCRIPTION
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[0065] The module housing 420 has at least one viewing opening 414 and, arranged relative thereto, at least one camera mount 424. The camera mount 424 and/or the viewing opening 413 is advantageously configured as a recess in the holder body 422. The camera mount 424 is advantageously configured to releasably fasten a camera 410 in a defined position, for example via screws or via elastic clamps, clips, snap-fits or similar elastic elements. The camera 410 is fastened in the camera mount 424 in such a way that a lens surface 412 of the camera 410 has a free view through the viewing opening 414 out of the module housing 420. The camera 410 is advantageously fastened in the camera mount 424 in such a way that the lens surface 412 is arranged in the viewing opening 414.
[0066] The module housing 420 has at least one nozzle holder 340 which is configured to hold a cleaning nozzle 318. The embodiment shown in the present case has a first nozzle holder 340 in the form of a compressed-air nozzle holder 342 which is configured to hold a compressed-air cleaning nozzle 320, and a second nozzle holder 340 in the form of a liquid nozzle holder 344 which is configured to hold a liquid cleaning nozzle 322. In other advantageous embodiments, the nozzle holder 340 can be configured to hold a combination nozzle 324. The at least one nozzle holder 340 is configured in particular as a recess in the holder body 422. The at least one nozzle holder 340 is configured and arranged in such a way that a cleaning nozzle 318 held therein directs a cleaning fluid RF onto the lens surface 412. In the case of embodiments with a plurality of, in particular two, nozzle holders 340, the latter are advantageously arranged offset by an angle W about a center point of the lens surface 412, wherein the angle W is preferably between 0 and 90°. The nozzle holder 340 and/or the cleaning nozzle 318 is connected fluidically via a fluid line 332. The fluid line 332 has a line body 333, in particular a compressed-air line body 335 and/or a liquid line body 337. The cleaning arrangement 500 advantageously has a first fluid line 332 in the form of a compressed-air fluid line 334, and a second fluid line 332 in the form of a liquid fluid line 336. The compressed-air fluid line 334 has a line body 333 in the form of a compressed-air line body 335 and the liquid fluid line 336 has a line body 333 in the form of a liquid line body 337. The module housing 420, in particular the retaining device 426, or the cleaning arrangement 500 has a holder opening 423 through which the at least one fluid line 332 and any further lines such as camera lines 902 and/or control lines 904 can advantageously be routed from the vehicle 1000 into the module housing 420. The holder opening 423 is advantageously configured and arranged in such a way that, in the assembled state of the module housing 420, it is not visible and is advantageously covered in sealing fashion by the vehicle 1000, in particular by an A-pillar 1008 of the vehicle 1000. The holder opening 423 can advantageously be configured to fasten the module housing 420 to the vehicle 1000, in particular to an A-pillar 1008 of the vehicle 1000, and for this purpose can have at least one screw connection such as, for example, a threaded bore, or a positively releasably lockable fastening device such as, for example, one or more snap-fits.
[0067] The module housing 420, in particular the holder opening 423, can have a line connection 480, in particular in the form of a plug-in connection 482. The cleaning arrangement 500 can be connected fluidically to one or more cleaning fluid sources, in particular a compressed-air source and/or a liquid source. In the present case, the line connection 480 has a first line connection 480.1 for the compressed-air fluid line 334, and a second line connection 480.2 for the liquid fluid line 336. In other advantageous embodiments, the line connection 480 can be configured as a clamping bushing 484.
[0068] In other advantageous embodiments, the line connection 480 can be configured as a screw connection 488, in particular a bulkhead screw connection 488A, a hose connector 488B or a plug-in screw connection 488C or a combination of the above-mentioned types of line connections 480. A bulkhead screw connection 488A, as shown by way of example in
[0069] A plug-in screw connection 488C, as shown by way of example in
[0070] A holder opening 423, in particular a line connection 480, can advantageously be configured so that it can rotate, in particular about a module axis AM, in order to enable rotatable adjustment of the camera module 400, advantageously when the vehicle 1000 is being operated. For this purpose, the line connection 480, in particular a plug-in connection 482 or a clamping bushing 484, is advantageously likewise configured and/or arranged rotatably.
[0071] In the present case, a line holder 441 is realized by means of a line guide 440 and a line retainer 450. The fluid line is thus advantageously held in the line guide 441 and the line retainers 450, which retain the fluid line, are arranged therein.
[0072] In the case of simplified embodiments not shown here, it may in principle also be advantageous to place the fluid line in the line guide such that the line retainers can be superfluous in a first embodiment not shown here. In an embodiment not shown here, one or more suitably realized retaining means can also be realized. For example, the line holder can be realized with a precise fit for the fluid line in any case at certain retaining points such that these retaining points serve as a retaining means, in this respect thus instead of the line retainers which are otherwise to be provided separately. Conversely, a line holder can also be realized only with a number of line retainers and they could possibly be attached to an outer side of the holder body such that a line guide inside the holder body could in any case be largely superfluous. A line holder can in this respect be realized in different embodiments, only some of which are mentioned here.
[0073] An embodiment with reference to the particularly preferred line holder 441, which is realized by means of a line guide 450 and a line holder 440, is shown and described below in any case with further reference to the drawings.
[0074] In the present case, the retaining device 426 of the module housing 420 has a line guide 450 which is configured to hold one or more fluid lines 332. Overall, the module housing 420 also has a line guide 450 for in each case one fluid line 332, for example in the form of a compressed-air line guide 452 for the compressed-air fluid line 334, and a liquid line guide 454 for the liquid fluid line 336. In other embodiments, as shown here, a common line guide 450 can be provided for all the fluid lines 332 which are advantageously routed in parallel to one another. The common line guide 450 can advantageously be configured to hold further lines, in particular electrical control lines 904 and/or camera lines 902, or a line bundle 920 including a plurality of lines. The line guide 450 is configured in the present case as a hollow channel 456, that is, here in the holder body 422. The hollow channel 456 is advantageously, as shown here, open on an outer side of the module housing 420 and can be closed by means of a cover which is not illustrated here.
[0075] In particular, such a cover can be fastened on the module housing 420 and the holder body 422 by means of screws or snap-fits in order to cover the hollow channel 456 so that it is closed. A number of line retainers 440 are provided in the line guide 450, in particular in the hollow channel 456, for the retaining device 426 in order to fasten, in particular releasably fasten, the fluid line 332. The line retainer 440 is advantageously configured as a line clip 442, as also shown schematically in
[0076] The retaining device 426 of the module housing 420 can have one or more actuator holders 428 for holding a fluid actuator 356, in particular a valve 360. The actuator holder 428 is advantageously configured as a recess in the holder body 422. The fluid actuator 356 can advantageously, as shown here, be configured as a quick air-release valve 430. In other advantageous cleaning arrangements 500, a fluid actuator 356 can alternatively or additionally be configured in a different form, in particular as a 2/2-way valve 364 or as a 3/2-way valve 372. The actuator holder 428 advantageously has a retaining connection 446 for in particular releasably fastening the valve 360. The retaining connection 446, as also shown schematically in
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[0080] Shown in
[0081] The retaining device 426 of the module housing 420 can have, in particular in the holder body 422, one or more actuator holders 428, in particular valve holders 429 or pump holders 486. In the present case, the holder body 422 has a first actuator holder <us-rn>428.1</us-rn> for holding a fluid actuator 356, here in the form of a valve 360, in the first compressed-air fluid line 334. The valve 360 held in this actuator holder 428 can in particular be configured as a 2/2-way valve 364, in particular as a pneumatic 2/2-way valve 368. A compressed-air fluid line 334 can be selectively opened and closed by means of a 2/2-way valve 364 in order in this way to supply compressed air DL to the cleaning nozzle 318, here to the compressed-air cleaning nozzle 320.
[0082] In the present case, the holder body 422 has a further second actuator holder 428.2 for holding a fluid actuator 356 configured as a valve 360 in the liquid fluid line 336. The valve 360 held in this second actuator holder 428.2 can be configured in particular as a 2/2-way valve 364, in particular a hydraulic 2/2-way valve 370. Alternatively or additionally, the holder body 422 can have an actuator holder 428 configured as a pump holder 486 which is configured to hold a fluid actuator 356 configured as a pump 390. The pump 390 can be configured in particular as an electric pump 390. Such a pump 390 is, in embodiments in which the liquid source 660 is configured as unpressurized, in particular advantageously, for example, a windscreen water tank 662. A pump 390 is configured to convey cleaning liquid. Cleaning liquid F can be supplied to the cleaning nozzle 318, here to the liquid cleaning nozzle 322, selectively by electrically activating the pump. Each cleaning nozzle 318 can advantageously be connected fluidically to a fluid line 332 by means of a plug-in connection 338.
[0083] A further cleaning arrangement 500′ with a further camera module 400′ and a further holder body 422′ with a retaining device 426′ is illustrated in
[0084] A still further advantageous cleaning arrangement 500″ with a correspondingly configured still further holder body 422″ of a still further module housing 420″ with a still further retaining device 426″ is shown in
[0085] The provision of a non-return valve 380, in particular of a first and second non-return valve 380.1, 380.2 advantageously enables, in an improved fashion, the use of a combination nozzle 324 as a cleaning nozzle 318. A non-return valve 380 in a first fluid line 332 prevents, when a cleaning fluid RF is passed through a further fluid line 332 connected to the combination nozzle 324, this cleaning fluid RF from entering the first fluid line 320. A combination nozzle 324 is preferably formed from a nozzle body 325. A combination nozzle 324 can have a combination connection 324.1 for connecting a combination line 328. In the present case, the combination line 328 is connected fluidically to the compressed-air fluid line 334 and the liquid fluid line 336 via the line junction 326. In alternative cleaning arrangements 500, a combination nozzle 324 can have separate connections, in particular a compressed-air cleaning connection 324.2 which is configured to fluidically connect the compressed-air fluid line 334, and a liquid cleaning connection 324.2 which is configured to fluidically connect the liquid fluid line 336. In such configurations of the combination nozzle 324, the two lines are preferably joined inside the nozzle body 325.
[0086] The still further holder body 422″ can optionally have further actuator holders 428 for holding a fluid actuator 356, for example valve actuators 429 such as, as shown here, the first actuator holder 428.1 and the second actuator holder 428.2, or pump holders 486 for holding a pump. Alternatively, however, fluid actuators 356 required to switch or convey the cleaning fluid RF can also be arranged in the vehicle 1000 and/or in a fluid supply module 200, as indicated here in dashed lines.
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[0090] Optionally, the cylinder ram 227 can, in order to better seal the air chamber 222 from the liquid chamber 224, have a seal 229, in particular made from plastic and/or rubber. The cylinder ram 227 is retained in the cylinder volume VZ of the pressure cylinder 220 by a restoring spring 228 such that, in the case of a deflection, caused in particular by air pressure being applied to the air chamber connection 223, a restoring force FR is generated.
[0091] The pressure cylinder 220 can have a cylinder volume VZ of between 5 ml and 80 ml, preferably between 10 ml and 40 ml, particularly preferably between 10 and 20 ml.
[0092] If the 3/2-way valve 372 is situated in an air-admission position 372A, air pressure supplied by the compressed-air source 600 is forwarded to the air chamber connection 223, which causes expansion of the air chamber 222 and the supply of a liquid cleaning pulse FRI to the liquid chamber connection 225 and hence to the liquid cleaning nozzle 322 (or a combination nozzle 324 which is not illustrated here). The third non-return valve 380.3 prevents the liquid cleaning pulse FRI from flowing back in the direction of the line connection or the liquid source 660.
[0093] In an air-release position 372B of the 3/2-way valve 372, the air chamber connection 223 is pneumatically connected to the compressed-air cleaning nozzle 320 (or a combination nozzle 324 which is not illustrated here), as a result of which the air chamber connection 223 is bled and the divider 226 is moved backwards by the restoring force FR. As a result, both the air chamber volume VL of the air chamber 222 is reduced and the liquid chamber volume VF of the liquid chamber 224 is enlarged. A reduced pressure at the liquid chamber connection 225 is created by the backward movement of the divider 226. By virtue of the fourth non-return valve 380.4, the reduced pressure acts only in the direction of the liquid source 660 (and not at the cleaning nozzle 318, here the liquid cleaning nozzle 322), as a result of which new cleaning liquid F is drawn from the liquid source 660 into the liquid chamber 224, in particular advantageously without there being any need for a pump or similar conveying device or a hydraulic switch valve.
[0094] The embodiments shown in
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[0098] The camera module 400 has a camera 410, not illustrated in detail here, which is connected to an electronic control unit 700 via a camera line 902 so that it can send signals. The camera 410 is configured for the optical capture EO of an outside area 3000, in particular an outside area 3004 towards the rear. The first camera module 400.1 is here arranged for the optical capture EO of a first outside area 3000.1 towards the rear on the driver’s side 1012. The second camera module 400.2 is arranged for the optical capture EO of a second outside area 3000.2 towards the rear on the passenger’s side 1014. “Towards the rear” here means in particular directed counter to a forward driving direction 1020 of the vehicle 1000 in the direction of the vehicle body axis 1010. The electronic control unit 700 is in turn connected to a playback unit 910, in particular a screen 912, for displaying the image recorded by the camera 410 so that it can send signals. In the present case, the first camera 400.1 is connected to the electronic control unit 700 via a first camera line 902.1.
[0099] The camera module 400 furthermore has a cleaning arrangement 500 which is not illustrated in detail here. The cleaning arrangement 500 is pneumatically connected to a compressed-air source 600 by means of a compressed-air fluid line 334. In the present case, the cleaning arrangement 500 of the first camera module 400.1 is fluidically connected to the compressed-air source 600 via a first compressed-air fluid line 334.1. In the present case, the cleaning arrangement 500 of the first camera module is connected to the liquid source 660 by means of a first liquid fluid line 336.1. Where a camera module 400, in particular the first and/or second camera module 400.1, 400.2, has one or more fluid actuators 356 for switching or conveying a cleaning fluid RF, in particular valves 360 or pumps 390, the mirror replacement system 900 also has one or more electrical control lines 904 for selectively electrically switching these fluid actuators 356 via the electronic control unit 700 or a further control unit. In the present case, the first camera module 400.1 is connected to the electronic control unit 700 via a first valve control line 904.1 so that it can send signals.
[0100] The explanations made above for the first camera module 400.1 apply in a similar fashion with corresponding numbering for the second camera module 400.2.
[0101] A plurality, in particular all, of the lines 334, 336, 902, 904 described here can advantageously be routed as a line bundle 920 through the vehicle 1000 and/or the module housing 420 at least over parts of the distance leading to the camera module 400. Such a line bundle 920 can in particular include a hose or net or similar elongated, in particular flexible means for bundling the lines 334, 336, 902, 904. The installation and/or the repair of a camera module 400 can advantageously be simplified by means of a line bundle 920. Optionally, the vehicle can have a fluid supply module 200 which includes a compressed-air source 600 and/or a liquid source 660 or is fluidically connected thereto, and is configured for the supplying of at least one cleaning fluid RF to the cleaning arrangement. The module housing 420 with the holder body 422 and the retaining device 426 advantageously allows a flexible configuration of cleaning arrangements 500. Different cleaning arrangements 500 can advantageously be produced by virtue of the presence of actuator holders 428 and/or line guides 450 and/or line retainers 440 in standard arrangements, wherein the module housing 420 does not need to be adapted or only slightly. In particular, for this purpose fluid actuators 356 have identical or similar external dimensions such that exchangeability of different fluid actuators 356 in an actuator holder 428 is possible.
[0102] It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.
TABLE-US-00001 List of reference signs (part of the description) 220 pressure cylinder 222 air chamber 223 air chamber connection 224 liquid chamber 225 liquid chamber connection 226 divider 227 cylinder ram 228 restoring spring 229 sealing ring 260 connecting fluid line 318 cleaning nozzle 320 compressed-air cleaning nozzle 322 liquid cleaning nozzle 324 combination nozzle 324.1 combination connection 324.2 compressed-air cleaning connection 324.3 liquid cleaning connection 325 nozzle body 326 line junction 328 combination line 332 fluid line 333 line body 334 compressed-air fluid line 335 compressed-air line body 336 liquid fluid line 337 liquid line body 338 plug-in connection 340 nozzle holder 342 compressed-air nozzle holder 344 liquid nozzle holder 356 fluid actuator 358 actuator housing 360 valve 362 valve housing 364 2/2-way valve 366 2/2-way magnetic valve 368 pneumatic 2/2-way valve 370 hydraulic 2/2-way valve 372 3/2-way valve 372A air-admission position of the 3/2-way valve 372B air-release position of the 3/2-way valve 374 pneumatic 3/2-way valve 380 non-return valve 380.1, 380.2, 380.3, 380.4 first to fourth non-return valve 390 pump 392 pump housing 410 camera 412 lens surface 414 viewing opening 420 module housing 421 housing wall 422 holder body 423 holder opening 424 camera mount 426 retaining device 428 actuator holder 429 valve holder 430 quick air-release valve 430.1 first valve connection 430.2 second valve connection 432 quick air-release valve housing 432.1 charging space 432.2 annular projection 433 valve ram 434 positioning feature 436 positioning plug 437 positioning pin 438 actuator position 440 line retainer 440.1 single line retainer 440.2 double line retainer 441 line holder 442 line clip 442.1 single line clip 442.2 double line clip 444 retaining strap 445 retaining strap holder 446 retaining connection 447 line retaining strap 448 combination retainer 449 combination clip 450 line guide 452 compressed-air line guide 454 liquid line guide 456 hollow channel 457 line retaining strap holder 462 holding feature 464 holding groove 465 holding bore 466 fastening clip 480 line connection 482 plug-in connection 484 clamping bushing 486 pump holder 488 screw connection 488A bulkhead screw connection 488B hose connector 488C plug-in screw connection 489 thread 490 vehicle side of the module housing 492 step side of the module housing 494 nut 495 insert thread 500 cleaning arrangement 536 inner wall 600 compressed-air source 610 compressed-air supply system 660 liquid source 662 windscreen water tank 700 electronic control unit 900 mirror replacement system 902 camera line 902.1, 902.2 first, second camera line 904 control line, electrical control line 904.1, 904.2 first, second control line 910 playback unit 912 screen 920 line bundle 1000 vehicle 1002 commercial vehicle 1004 car 1008 A-pillar 1010 vehicle body axis 1012 driver’s side of the vehicle 1014 passenger’s side of the vehicle 1020 forward driving direction of the vehicle 3000 outside area 3004 outside area towards the rear AM module axis AS ram surface area AV valve axis of the quick air-release valve DL compressed air DRI compressed-air cleaning pulse DS stream of compressed air EO optical capture F liquid FB applied force FR restoring force FRI liquid cleaning pulse FS stream of liquid K spring constant RF cleaning fluid VF liquid chamber volume VL air chamber volume VZ cylinder volume