windscreen wiping

8/13/2019 Windscreen Wiping

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education and knowledge, the attached public safety standard is made available to promote the

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IS 58 2 : 2 8

1 . m e m 1 T C f > 1 ~ ~ : c r R em T fu Q: f c f ~ rU ffi Indian Standard

AUTOMOTIVE VEHICLES WINDSCREEN WIPINGSYSTEM FOR 4 WHEELERS OTHER THANMlCATEGORY OF VEHICLES REQUIREMENTS

s 43.040.65

BIS 2008URE U OF INDI N ST ND RDSM N K H VN 9 H DUR SH H Z F R M RG

NEW DELHI 110002

July 8 Price Group 4


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Automotive Electrical Equipments and Instruments Sectional ommittee. T ED 11

FOREWORDThis Indian Standard was adopted by the Bureau of Indian Standards after the draft finalized by the AutomotiveElectrical Equipments and Instruments Sectional Committee had been approved by the Transport EngineeringDivision Council.This standard has been brought out in order to specify performance requirement of w ip in g system to ensure aclear visibility for the driver on the road during inclement weather conditions so as to make the driving safe.In the formulation of this standard considerable assistance has been d rawn from the f ol lo wi ng :

AIS-OI1l2001 Automotive vehicles - Testing procedure for windscreen wiping system for 4 wheeler andother than M1 category of vehicles

For the purpose of deciding whether a particular requirement of this standard is complied with the final valueobserved or calculated expressing the result of a test or analy si s shall be r ou nd ed of f in accordance withIS 2 : 1960 Rules for rounding off numerical values revised ).he number of significant places reta ined in therounded off value should be the same as that of the specified value in this standard.


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IS 15802 : 2008

ndian StandardAUTOMOTIVE VEHICLES - WINDSCREEN WIPING

SYSTEM FOR 4 WHEELERS OTHER THAN MICATEGORY OF VEHICLES - REQUIREMENTS

SCOPEThis s tandard specifies requirements for frontwindscreen wiping system of all motor vehicles havingminimum four wheels and having windscreen for M2,M3, NI , N2 and N3 category of vehicles .2 REFERENCE

3.6 Opposed Pattern - The pattern produced by thewiper blades moving in opposite directions across thewindscreen glazing simultaneously.3.7 Chatter - Irregular movement of the wiper bladeusually accompanied by temporary visible radial linesand/or noise.

14272 Automotive vehicles - TypesPart I : 1995 Terminology: Part I Three and fourwheelers3 TERMINOLOGY

The following standard contains provision whichthrough reference in this text, constitutes provisionof this standard.At the time of publication, the editionindicated wasvalid.This standard is subject to revisionand parties to agreements based on this standard isencouraged to investigate the possibility of applyingthe most recent edition of the standard indicatedbelow:

S No T tle

3.8 Ballooning - Unwiped area within the wipedpattern, varying in size and usually round.3.9 Streaking - Fine accurate lines of unwipedmoisture within the wipe pattern.3.10 Scalloping - Uneven wipe at the outer peripheryof pattern.3.11 Lace Curtain - A maze of fine individual waterdroplets which are formed after the wiper blade passesover the windscreen glazing surface.3.12 Hazing - An aerated film spread by the bladeand resulting in a transient trailing band on thewindscreen glazing surface .

For the purpose of this standard definitions given inIS 14272 Part along with those given under shallapply. .3.1 WindscreenWipingSystem - The wipingsystemconsists of all apparatus for cleaning the exteriorsurface of windscreen glazing together with thenecessary devices and controls to actuate and arrestthe operations.3.2 WindscreenWiper Blade - A device for clearingtheeffectivewipe pattern, capable of receiving pressurefrom an arm comprising a suitable superstructure, forsupporting and controlling a wiper blade element.3.3 WiperBlade Element - The resilient member ofthe wiper blade that contacts the windscreen glazingsurface.3.4 EffectiveWipe Pattern - That portion of the wetwindscreen glazing surface which is cleaned when thewiper blade travels through a cycle with systemworking on or above the minimum frequency3.5 Tandem Pattern - The pattern produced by thewiper blades moving in the same direction across thewindscreen glazing surface simultaneously.

3.13 Wiper Cycle - Wiper cycle shall consist ofwiperblade movement during system operation from oneextreme of the windscreen wipe pattern to the otherextreme and return.3.14 Snow Load - The load imposed on the wipersystem by the accumulation of packed snow, resultingin a limitation of blade travel.3.15 Motor Stall Torque- The maximum torque thatthe motor can maintain for two cycles at specifiedcondition .3.16 SystemTorque - Torque necessary toovercomemaximum friction of the wiper blade and the drivingmechanism under specified conditions.3.17 Damp Dry - The condition of the windscreenwhich produces the highest friction during thetransition from a wet to dry surface .3.18 Moisture - Atmospheric water precipitation inliquid, semi-liquid or frozen state snow .3.19 Relative irSpeed - The vector difference ofvehicle speed and component of the wind speed parallelto the direction of travel of the vehicle .


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IS 15802 : 20083.20 Growth - Growth is the apparent increase inthe wiped area due to the drying of the water or scanerof water on the boundaries of the real wiped area dueto the very high wind velocity and the resultant shiftof the w ip er blade on both side end s of the stroke.3.21 Unwrapped View - The actual surface area ofglazing surface viewed by the driver from the insideof the vehicle taking into account the curvature, butwithout any sideframe, top and bottom supports, centralpillars and other decorative linings.3.22 Daylight Opening DLO) - The term DaylightOpening DLO) refers to the max imum unob structedo pe ni ng t hrou gh any g la ss a pe rt ure, with reveal orgarnish mouldings adjoining the gla zing surfaceinstalled normal to the glass surface.3.23 Glazing Surface Reference Line - Mean s theline res ul ti ng from the i nt erse ct io n of the glazingsurface and a horizontal plane 635 mm above theseating reference point, as shown in Fig. 1.3 24 Overall Width - Means the maximum bodywidth measured across the body, excluding hardwareand applied mouldings, but including fenders whenintegral with body.3.25Plan View Reference Line Means

a) For vehicle with bench type seats - A lineparallel to the vehicle longitudinal centrelineoutboard of the steering wheel centreline 0.15times the difference between one half of thes ho ul de r roo m d imen si on s shown as inFig. 2 and the distance between the steeringwheel centreline to the vehicle centrelineshown as in Fig . 2.

b) For vehicles with individual type seats - Al ine parallel to the vehicle longitudinalcentreline located so that the geometric centreof the 95 percent eye range contour ispositioned on the longitudinal centreline ofthe drivers designated seating position.

3.26 Shoulder Room Dimension Means - Theminimum lateral dimension between the doo r garnishmouldings or nearest interference mea sured in thelateral plan through the drivers seating reference point.3.27 E ye ll ip se - The co ntr act ion of the words eye

.ellipse used to describe a statistically derivedelliptical model representing driver eye locations inroad vehicles.4 REQUIREMENTS4.1 Each vehicle shall have a power driven windscreenw ip in g s ys te m that meet s the requirements of 4.1.1to 4.1.4.

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4.1.1 The wiper system sha ll be capable of attainingthe min imum operating fre q ue ncy o f 30 cycles/minreg ardl es s o f eng ine lo ad an d eng ine speed. If thewindscreen w iper is ha v ing two o r more sweepfrequencies then:

a) One of them sh all not be les s than 45 cycles/min a cycle being the f or wa rd and returnmovement of the windscreen wiper).

b) One of them sh all not be less than 10 and notmore than 55 cycles/min.

c) The difference between the hi gh est and theleast one of the lower sweep frequencies shallbe atleast 15 cycles/min.

4 1 2 Wiped AreaThe m in im um wind screen wiped area is de scribed bythree specific areas as percentage on d efin ed areas onthe exterior windscreen glazing surface . Three defineda re as are developed with the veh icle loaded to themanufacturers recommended designed l oad and areidentified in Tables I and 2 for all t yp es of veh icle, asare as A, B and C Each area will be establ ish ed usingthe angle s ofTable I applied as shown in Fig . IIn theside view, the upper and lower boundary of the area isestablished by the intersection of two planes, whichare seen as line s tangent to the upper and lower edgesof the eyell ipse , with the windscreen glazing surface.The p la nes are fixed by angles above and below X-Xline. In the plan view, the left and the right boundaryof the area is established by the i nt er sect ion of twovertical p lan es t an ge nt to the left and right edge s ofthe eyellipse with the wind screen glazing surface.Theplanes are fixed by a ng les to the left and rig ht of theX-X line. The a re as used in determining the percentageof wi pe d a re a are t ho se areas on the exterior glazingsu rf ace, which are not w it hi n 25 mm of the edge ofthe opaque support or rubber beading. The percentageis the ratio of wiped area within the d ef ine d area tothe d efin ed a re a, u si ng t es t procedures established in5 2 1 see Table and T ab le 2 for percentages to bewiped).The wiped area is the a re a of the design pattern asexplained abo ve plus growth to be m ea su re d duringthe test) as s ho wn in Fig . 2. the angles as per Table Imeet outside the windscreen glazing surface, the areaslying on the w in ds cree n w it hi n 25 mm fro m the edgeof the rubber beading or opaque surface are to beconsidered.4 1 3 Strengthhe system sha ll be capable of withstanding the loadsinduced by stall, u si ng te st condi tions and testprocedures established in 5.4 with all mechanicalcomponents remaining functional.


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IS 58 2 : 2 8

STEERINGWHEEL t

WINDSHIELDGLAZING SURFACE

POINT ON LINE Z ZxO.851W7 O.075 W3

t C R l

PLAN VIEW

EYELLIPSE

MANIKIN H POINT 6 5WITH SEAT IN MOSTFORWARD POSITION- - - . . . . . . . . . c t - _ ~

~ : . = - = r ~ - - r - ~ M N K N H POINTWITH SEAT IN REARMOSTPOSITION

GROUNDLEVEL

SIDEVIEW

FIG EYELLIPSE TEMPLATE LOCATION FOR RIGHT H ND DRIVE

3


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IS 15802 : 2008

LEFT +---; .

b

VEHICLE tSHOULDER ROOM

STEERINGWHEEL

. r 1 ~ ~ _ R I G H T95 EYELLIPSE--I* -+---- O.15(a-b)

RIGHT H NEXTREMITY OFSHOULDER ROOM

F IG 2 P LAN V IEW FOR B ENCH SEAT

Table 1Windscreen WipingAreaAnglesClause 4.1.2)

Classification F Dimcnsions Arca Anglc in DcgreesSuFig.1 AUp Down Right LeftI (2) (3) (4) (5) (6) (7)

Vehicles having GVW exceeding 7 500 kg except M3 category Oto 16mm A 10 5 18 56of vehicles with full forward control 8 5 3 14 53C 5 I 10 15

I 016 to I 270 mm A 8 7 18 568 3 5 14 53C 3 3 10 15

Above A 6 9 18 56I 270mm 8 I 7 14 53C I 5 10 15

M3 category of vehicles with full forward control and GVW All A 7 14 18 65exceeding 7 500 kg 8 2 II 18 65C I I I 18 25Vehicles ofcategory M2. M3. NI and N2 having GVW not All A 7 5 16 49exceeding 7 500 kg 8 4 3 13 46C 3 I 7 13

4


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Table 2 Minimum Windscreen Wiped AreaClause 4.1.2

Windsbield Type Minimum Percent Areas to beWipedr -AreaA AreaB AreaC

OnePiece 80 94 99Multi Piece 65 70 844.1.4 Temperature Operational CapabilityThe windscreen wiper system shall be capable ofoperating between temperatures 55 3C and 0 3C,using test procedures and test conditions establishedin 5.5.4.2 Windscreen Wiper Blade4.2.1 AgeingThe wiper blade element of the wiper blade assemblyshall withstand the ozone test described in 5.6.4.2.2 Chemical ResistanceThe wiper blade element shall withstand the chemicalresistance test described in 5.7.5 TEST PROCEDURE5.1 The test specified in 5.2 to 5.5 shall be conductedeither on the complete vehicle with the wiper systeminstalled on the vehicle or it shall be conducted withthe help of the test equipment and test rig as describedin AnnexA.5.2 WipedArea TestTheprocedureasgiveninAnnexAwillbe followedusingthe test rig explained therein or on a complete vehicle.5.3 WiperSystem Frequency Test5.3.1 TestEquipmentApart from the test rig the additional equipmentsrequired will be counters, water softener, cleanser,temperature measuring device and voltmeter.5.3.2 Wiper system frequency test shall be conductedunder the following conditions:

a) Ambient temperature not exceeding 40C.b) Water temperature 40C maximum.c) Water nozzles - to be located so as to provide

an approximately equally distributed waterflowon windscreen glazing surface at the rateof not less than 820 cdmin.

d) Clean, Oil - free water.e) Power input level at electrical drive motor

(frequency test only) shall be maintained at6750 I 13 50 1 and270 2Vfor6 12and 24V system respectively or power

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IS 15802 : 2008available at the drive motor, under normalvehicle operating conditions, as specified byvehicle manufacturer, Whicheveris less.

f) Power input level at pneumatic drive motor(frequency test only) shall be maintained at71kg/em air pressure or power available atthe drive motor under normal vehicleoperating conditions as specified by vehiclemanufacturer whichever is less.5.3.3 System Frequency DeterminationClean the windscreen. Water is to be appliedcontinuously to the windscreen throughout the test, asindicated in5.3.2(c).Apply power to the drivemotor asspecifiedin5.3.2(e)or 5.3.2(f).Withappropriatecontrolsettings, determine system operating frequencies.5.4 Test for Wiper System Stall (Strength)5.4.1 Test Equipment

a) Test rig - As described in A-1(c), andb) Power source - As described in A-l(d).

5.4.2 Test ProcedureAt an ambient temperature not exceeding 40C andwith the specifiedpower supply, thewiper system shallmeet the requirements specified in4.1.3when thewiperarms, in any position in the wipe circle, are restrainedfrom movement for 15 s.5.5 Test for Wiper System Temperature OperationCapability5.5.1 Test Equipment

a) General - Test rig, power source, timingdevice and other pertinent equipmentdescribed in 5.3.1 shall be used in this test

b) Test chamber - A room or chamber largeenough to contain the complete test rig andcapable of maintaining a temperature of 52Cto80C in the upper range and0 to_lOoe inthe lower range.

5.5.2 Hot TestprocedureThe test rig and spray equipments are to be soaked inthe test chamber at a temperature of 55 3 C for 4 h.Following this soak period and in the same temperatureenvironment, the wiper system and spray equipmentsare tobe turned on and operated for a period of halfanhour at maximum wiper speed control setting withwater applied continuously as indicated in 5.3.2(c).5.5.3 Cold TestThe test rig is to be soaked in the test chamber attemperature of 0 3e for 4 h. Following this soakperiod and in the same temperature environment, the


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IS 15802 : 2008wiper system is to e turned O N and the wipersoperated for half an hour at maximum wiper systemspeed control setting.5.6 Ozone Testing5.6.1 Preparation o Wiper Blade ElementA 150 mm specimen of the wiper blade m ~ n tassembly is to be installed in a suitable clampingfixture, in which it is to estretched so as to cause anexte nsion of 15 perce nt me asure d between gauge ,marks that are 100 mm apart.The mounted specimens are then to be exposed for48 h in an ozone free atmosphere.

5.6.2 ProcedureTest specimens are to be placed in the ozone testchamber for a period of 72 h. The test chamber is to beoperated at a temperature o f 40 3C and at aconcentration of 50 pphm, by volume.5.6.3 Specimens shall be examined for signs of cracksand shall not show cracks under 7X magnification.5.7 Chemical Resistance TestingA section of the wiper blade element when placed in a50 percent solution of either methyl or isopropylalcohol for a period of24 h shall not ch ange its weightby more than 2 percent.

ANNEXAClauses 5 and 5.2TEST EQUIPMENTS AND TEST PROCEDURES FO R WINDSCREEN WIPER

A I TEST REQUIREMENTa) Draft ing eq ui pmen t sufficient for full-size

windscreen and wiper system layout.b) Trans parent heavy gauge plastic sheet

prepared in clear acetate or equivalent. .c) Test Rig - A test rig shall consist of structure

capable of maintaining, throughout the test,the proper relationship of the glazing surfacean d th e windshield wiping systemc om pone nts as e stablished by the vehiclemanufacturer.

d) Power Source - The power source shallsupply to the wiper motor the maximumpower expected by the vehicle manufacturerunder the conditions specified in any of thetest procedure s paragraphs.

e) Spray Equipment - Spray nozzles to applywater to glazing surface .A-2 TEST PROCEDURES

a) Work to exterior surface of windshieldglazing.b) The design wipe pattern will be as shown plus

the growth due to wetted windshield and highspeed system operation. This growth may bedetermine d e xperim enta lly or an assumedallowance for each direction of wipe may beutilized.

c) Al l calculations shall be made in theunwrapped view.6

d) In vehicle position plan view and side view,layout windshield surface, DLO Daylightopen ing) 95th perce ntile e yeIlipse and theareas A, B and C, are generated on the exteriorof the windscreen, glazing surface using theangles.

e) Develop an unwrapped view of th ewindscreen glazing surface and DLO . Designthe wipe pattern, apply growth and transferthe pattern together with areas A, andC intounwrapped view.

f Calculate the percentages of areas and Cthatare wiped with design pattern plus growthin the unwrapped view.

A-3 T EST RIG EVALUATIONa) Operate test rig with water O N and wiper

system on high speed , and mark outline ofwipe pattern.b) Transfer full size unwrapped view with wipe

pattern and areas A, Band C to transparentheavy gauge plastic sheet.c) Transfer wipe pattern from the test rig to the

plastic sheet and recalculate the percentagesof areas A, andC that are wiped see Fig. 3).

A4 T EST PROCED URE FOR ESTABLISHINGMOTOR VEHICLE DRIVER S EYE LOCATION

a) Introduction - A procedure for determiningthe position of driver s eye on vehicle, as givenbelow.


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Manufacturer should specify the H-point thatis, dimension H-30 and all the dimensionsgiven in Fig . 1 and 2. However, the H-pointas determined by thi s m et hod and o th erdimen sions as measured on vehicle will beused for checking the requirements ofwindscreen wiping .These measurement s willbe recorded for com paring with the valuesspecified by the manufacturer.

b) Definitions1) Cla ss A vehicles - Vehicles where

driver s workspace is clo se to N Icategory of vehicles. Following limits aregiven as guidelines see Fig . 1 andFig. 2)Dimension H-30 equal to or less than405 mmSteering w he el d ia me te r less than450mmTorso angle L-40 range 5 to 40

2 l ss B vehicles - Vehicles wheredriver s workspace is clo se to heavytruck . Following limits are given asguidelines see Fig. I and Fig. 2).Dimen sion H-30 more than 405 mmSteering wheel d iameter m or e than450mmTorso angle L-40 range I to 180 .

c) A 3D H point machine is to be used.d) The 3D-H-pointmachine is seatedasin Fig. I.The H-point as given by machine is used .

IS 58 2 : 2 8e) Eyellipse focus is taken at 635 mm above

point and right eye eyellipse focus islocated as shown in Fig. 1, for bench seats.For bucket seats, right and left eye will be32.5 mm on either side of steering wheelcentre line.

f For further work any of the following methodsmay be used.I) The dimensions may be now transferred

to the com puter and further work maybe done by simulation.

2) An y o th er m et ho d to achieve thegeometric al requirements.

g) Eyellipse for left and right eye are identicalex ce pt that t he ir c en tr oi ds are sep aratedhorizontally by 65 mm.

h) The eyellipse for each eye is separatelyrotatedabout its centroid .I) For A Class vehicles - The x-axis is

inward 5.4 looking forward) in planview and down 6.4 looking forward)in side-view.

2 For B Class vehicles - The x-axis isinward 5.4 looking forward) in planview and down 11.6 looking forward)in side-view.i) The angles as given in Table 1 are

marked.ii) Further work is now proceeded withas per the standard.

ff TIV WIPER PATTERNPATTERN GROWTH ADDEDTANDEM PATTERN SHOWN TYPICAL

FI G . 3 U NWRAPPED R EAR VIEW OF W I NDSCREEN7


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Amendments Issued Since PublicationAmend No. Date of Issue Text Affected

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