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3.Definitions
3.1Defrost—Melt frost on the inside or outside, or test ice coating on the outside surface of the glass, with the
defroster system.
3.2Windshield Defroster System—Means intended to defrost the windshield.
地球的运动3.3Defrosted Area—That area of the windshield compod of dry, cleared surface and melted, or partially melted
(wet), test coating, and excluding that area of the windshield covered with dry test coating and which is defined and qualified by the following:
3.3.1The driver's at in the rearmost position (e Figure 1.)
FIGURE 1—SIDE VIEW OF AREA GENERATION
3.3.2The 95th percentile tangential cutoff two-dimensional ellip in accordance with SAE J941 shall be ud. 3.3.3The plan view reference line is defined as the plan view line outboard of the steering w
森林的英语
heel centerline and
parallel to the vehicle centerline. The dimension can be determined by: 0.85 x W7 + 0.075 x W3, where W3 and W7 are defined by SAE J1100 (e Figure 2.)
水槽什么牌子好3.3.4The glazing surface reference line which is defined as the line of interction of the glazing surface with the
父与子漫画
horizontal plane 635 mm above the manikin H-point as defined in SAE J826 (e Figure 1.)
4.General
4.1Area to be Defrosted—The minimum windshield area that shall be defrosted is described by the u of two
specified areas identified in Table 1 as areas A and C. Each area has been established using the angles of Table 1 applied as shown in Figures 1 and 2. In Figure 1, the upper and lower boundaries of the area are established by the interction of two planes, tangent to the upper and lower sides of the eye range contour, with the windshield glazing surface. The planes are fixed by angles above and below the glazing surface reference line. In Figure 2, the left and right boundaries of the area ar
e established by the interction of two planes tangent to the left and right sides of the eye range contour. The planes are fixed by angles to the left and right of the plan view reference line. Using the test procedures established in 5.4, a minimum of 80% of area A and 100% of area C should be defrosted in 30 min. The areas ud in determining the percentage of defrosted area are tho areas on the exterior glazing surface which are not within 25.4 mm of the edge of the daylight opening (pillar, division bar, header, etc.). Figure 3 illustrates all of the areas on a typical windshield.
The percentage is the ratio of the defrosted area within the defined area to the defined area.
FIGURE 2—
PLAN VIEW OF AREA GENERATION (REFERENCE SAE J1100)
FIGURE 3—TYPICAL LOCATION OF AREAS A AND C AS VIEWED FROM INTERIOR OF VEHICLE
TABLE 1—AREAS TO BE DEFROSTED
(REFERENCE SAE J903C)
Area Minimum Percent
Defrosted in 30 min
Angles,degrees (1)
Left
1.See Figures 1 and
2.
Angles,degrees (1)Right
Angles,degrees (1)
Up
Angles,degrees (1)Down
A 801856105C
100
10
15
5
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5.Defrosting Test
5.1Test Equipment
5.1.1Test chamber sufficiently large to contain the basic vehicle, with provision for circulating cold air.
5.1.2Means for recording the boundaries of the windshield areas defrosted. (A wax pencil is commonly ud for
outlining defrosted areas.)
5.1.3Engine tachometer
5.1.4Stopwatch or other timing device
5.1.5Thermometers or other temperature measuring devices
5.1.6Throttle control device (if desired)
5.1.7Stainless steel spray gun for applying water to the windshield with the following characteristics:
a.Fluid—water
b.Liquid nozzle size diameter—1.7 mm
c.Operating gun gage pressure—345 kPa
d.Airflow rate—0.0056 m3/s ± 0.0004 m3/s
Pattern at 200 mm from surface—300 mm ± 50 mm wide
5.1.8Device for measuring quantity of water
5.1.9Auxiliary power supply for blower motor
5.1.10Anemometer
5.2Test Conditions
5.2.1T EST C HAMBER T EMPERATURE—−18 °C ± 3 °C.
5.2.2E NGINE L OAD A ND S PEED—(T O O BTAIN N ORMAL O PERATING T EMPERATURES)—1500 rpm ± 50 rpm in neutral
gear, or any speed and load not to exceed the 40 km/h road load condition in the manufacturer's recommended gear.
The chassis dynamometer load ud to simulate road load shall be calculated as follows:
Using the product of the overall width (W117) and overall height (H101), as defined by SAE J1100, to approximate the vehicle cross-ctional area, determine the vehicle air resistance horpower using Equation 1:1
(Eq. 1)
where:
F = air resistance force, N = 0.0035 A
A = vehicle cross-ctional area, cm 2then for:
0.0395 A = 40 km/h, W
NOTE—The calculated air resistance horpower is the maximum load that is to be applied to the
chassis dynamometer. The abnce of the rolling friction of the nondriving wheels of the test vehicle compensates for the fact that the driving wheels on the dynamometer rolls result in greater rolling friction than that existing on a level road.
5.2.3
A IR V ELOCITY —3.2 km/h maximum, directed at the windshield parallel to the longitudinal centerline of the vehicle.
环保调查报告
5.2.4S OAK T IME —10 h (except as noted in 5.4.2).
5.2.5N UMBER OF V EHICLE O CCUPANTS D URING T EST —Two maximum.
5.2.6
W INDSHIELD W IPERS —Turned off. Wiper blades and arms to be off the windshield glazing surface during ice application.
祝福祖国歌词
5.2.7
D EFROSTER S YSTEM A IR —On full. Blower on high speed. Systems employing an initial time delay in bringing the blower up to high speed are to function as designed.
1. F = C D QA
where:
恋染红叶
C D = coefficient of drag (u 0.45 as a typical value)Q = dynamic pressure
= 1/2ρV 2 = 78.5 N/m 2 at 40 km/h where:
ρ = mass density, kg/m 3 V = air velocity, m/s
F 0.45 1.64A
×144---------------------------------- F 0.4578.5A ×10000----------------------------------== 0.0051A 0.0035A =
=W F 1()
km h ⁄×3.6
-------------------------------=
