Motor vehicle headlamp use and beam adjustment technical regulations

This standard specifies the use of motor vehicle headlamps and the adjustment and inspection requirements for the direction of high beam and low beam illumination.
This standard applies to motor vehicles traveling on roads and on urban roads, including automobiles, special vehicles, trolleybuses, motorcycles, and low-speed vehicles such as transport wheel tractors that are allowed to travel on designated roads and urban roads.

1 installation and use of headlamps
1. 1 Installation 1.1.1 The headlights for motor vehicles shall have the light distribution performance in accordance with GB 4599 - 84 "Light distribution performance of automobile headlights" GB5948 - 86 "Light distribution performance of motorcycle headlights" Provisions.
1.1.2 The headlights with high beam and low beam must be installed symmetrically on the left and right sides of the front of the vehicle. However, two- and three-wheeled motorcycles allow the installation of one or more dual-beam lights. A four-lamp headlamp is installed. When four lamps are arranged side by side, one pair of far and low beam double beam lamps should be symmetrically mounted on the outside; the other pair of far single beam lamps should be symmetrically mounted on the inside.
1 . 1 . 3 The installation position of the car headlights in the vehicle shall comply with the relevant provisions of GB 4785 - 84 "Number, position and light color of external lighting and signaling devices for automobiles and trailers"; Before making further regulations, it shall be implemented in accordance with the relevant provisions of GB 4785.
In the case of motor vehicle headlights, the installation position does not comply with the relevant provisions of GB 4785-84, allowing temporary transition.
1 . 1 . 3 . 1 The headlights symmetrically mounted on the same motor vehicle shall be of the same type, specification and light color.
1.1.3.2 The headlight beam of a motor vehicle shall be adjustable both horizontally and vertically, and shall be based on the direction of the collimated beam, and its adjustable angle shall not be less than ± 4 ° 30 ′.
1 . 1 . 3 . 3 The position of the headlight lens in the headlamp should be kept correct, and the up and down direction should not be reversed or rotated.
1 . 1. 3 . 4 For the headlights of the same motor vehicle, the left, right, far and low beams are not allowed to cross open.
1 . 2 Use of headlights 1. 2 . 1 High beam is used for driving illumination when there is no coming or no other vehicles in front.
1 . 2 . 2 The low beam is used for close-range illumination when the two cars meet; it is also used for the following nights:
a. When the trailing car is 30 to 50 m away from the preceding car;
b. driving on urban roads with street lighting;
c. Before passing the traffic command post.
1 . 2 . 3 . When the line of sight is unclear during foggy, snowy, heavy rain or dusty areas during the day, low beam lights can be used instead of fog lights;
It is not allowed to use fog lamps instead of low beam lights at night.

2 adjustment and inspection of the headlight beam
2.1 Adjustment and inspection methods 2. l. 1 Beam adjustment inspection should be carried out in front of the screen in a dark environment (Figure 1), or with the gauge to check the adjustment.
The site for adjustment and inspection should be level and the screen should be perpendicular to the site. The adjusted inspection vehicle shall be carried out under no-load conditions and on the condition of a driver.

figure 1

2.1. 2. The beam illumination orientation is indicated by the offset value I. The offset value indicates the rotation angle of the dark cut-off line or the center of the beam is adjusted along the horizontal h-h line or the vertical V left-left V (right-V-right) line on a screen of 10 m (dam) distance, Unit of measure is cm/dam
It can also be expressed by the eccentric angle a (°). Conversion formula

a=arc tg (Ï„/1000)

2.1.3 Adjust the test on the screen. The adjusted inspection vehicle is parked in front of the screen and perpendicular to the screen, so that the headlight reference center* is 10m away from the screen, and the h-h line on the screen is equal to the distance from the headlight reference center to the ground H: respectively Offset values ​​of the horizontal and vertical illumination directions of the right, far, and low beam.
2.1.4 Adjust the test with the meter. The adjusted inspection vehicle is placed opposite the measuring instrument according to the specified distance; the offset values ​​of the horizontal and vertical illumination directions of the left, right, far and low beam are respectively checked from the screen of the measuring instrument.
2.2 Adjustment and inspection requirements 2. 2.1 Adjustment requirements for the adjustment of the low beam of various types of lamps on the screen for motor vehicles, see Table 1.
Class A lamps: used in automobiles and motorcycles, and their light distribution performance meets the headlights specified in GB 4599-84 and GB 5948-86 respectively.
Class B lamps: headlamps that are allowed to be used interchangeably in automobiles and motorcycles.
Class C lamps: headlights for wheeled tractors used in transportation.

Table 1: Adjustment requirements for the adjustment of the low beam on the screen during no-load

2.2.2 With four-lamp headlamps, the adjustment of the high-beam single-beam lamp on the screen requires that the beam center be lower than 10% of the distance from the center of the lamp at the h-h line, ie: 0.1Hcm/dam The center of the beam is at a distance of 100m.
Shift left V, left V, right V, right, left and right:
The left lamp is not more than 10cm/dam (0.6°) to the left; it is not more than 17cm/dam (1°) to the right.
The right lamp is not more than 17cm/dam (1°) to the left or right.
2.2.3 For the motor vehicle, the far- and low-beam double-beam lamps are mainly used to adjust the low-beam beam to meet the requirements of Table 1.
2.2.4 The adjusted beam, on a flat road, its high beam should generally be able to take an obstacle about 100m away from the front of the vehicle; for low-speed vehicles such as wheeled tractors, the high beam should be able to clear the vehicle. An obstacle about 35m ahead.
2.2.5 After the vehicle is loaded. The headlight beam axis is tilted upwards, correspondingly changing the corner of the cut-off line or the offset of the beam center on the screen. When the amount of change is greater than 0.05~0.15H (depending on the vehicle), it should be adjusted to match 2.2.1, 2.2.2 provisions.

Printed Circuit Board assembly sometimes called PCB Assembly(PCBA).
The bare board is populated with Electronic Components to form a functional. In through-hole technology, the component leads are inserted in holes surrounded by conductive pads; the holes keep the components in place. In surface-mount technology (SMT), the component is placed on the PCB so that the pins line up with the conductive pads or lands on the surfaces of the PCB; solder paste, which was previously applied to the pads, holds the components in place temporarily; if surface-mount components are applied to both sides of the board, the bottom-side components are glued to the board. In both through hole and Surface Mount, the components are then soldered; once cooled and solidified, the solder holds the components in place permanently and electrically connects them to the board.

Pcb Assembly

PCB Assembly

PCB Assembly,PCB Circuit Board ,Electronic PCB Assembly,Professional PCB Assembly

Orilind Limited Company , http://www.orilind.com