SU1237507A1 - Method of upper beam-to-lower beam switching of vehicle road lights - Google Patents

Description

The invention relates to the electrical equipment of vehicles, and in particular to methods of controlling the non-switching of the front headlights from the main beam to the dipped beam when driving vehicles.

The purpose of the invention is to reduce the blinded effect of high-beam headlamps on vehicles.

FIG. Figure 1 shows the dependence of the coefficient of blind nden brightness p on the distance I between vehicles; in fig. 2 - dependence of the visibility range S on the distance 1; in fig. 3 is a block diagram of a device implementing this method.

Studies show that the vehicle’s headlights do not equally create blind pike shine. FIG. 1, the upper curve characterizes the change in the coefficient p for the headlamp closest to the oncoming traffic, and the lower curve, the other headlamp. The initial section of both curves corresponds to the main beam, the final section corresponds to the near light, and the section marked nggrih1 is inktivnoy. shnyi - the transition from the main beam to the near.

From FIG. 1, it follows that the schismatism created by the headlight closest to the band of encounters about movement, the c-zone of switching from the main beam to the near one, is almost twice as large as the glare created by another headlight. In accordance with this, in order to reduce the spreading of the glacier, it is advisable to reduce the speed of the high-beam light of the headlamp closest to the counter-flux strip but increase it compared to another headlamp.

It was also established that the range of visibility S in the non-switching period from high to low beam with an advance decrease in the main beam headlamp closest to the oncoming traffic is only slightly lower than the other headlight in synchronous reduction of the main beam light of both headlights that the graph of FIG. 2

The initial section of all curves corresponds to the range of visibility in high beam, the final section of all curves corresponds to the range of visibility in the near light, and curves a, b, c, d correspond to yes; 1 visibility in the transition to the dipped beam emitted by different ways: curve and the simultaneous disabling of the main beam and the inclusion of a passing beam;

curve b - a gradual decrease in the high-beam light and the inclusion of a passing beam od. time with the beginning of the main beam;

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curve 8 is a gradual decrease in the luminous flux of the high beam of both front headlights and the inclusion of dipped-beam at the moment when the luminous flux of the main beam provides the same range as the luminous flux of the dipped-beam; curve g non-switching of non-average headlights

happens according to.

The switching start in FIG. 1 and 2 are related to the distance between vehicles equal to 150 mm in accordance with the "Rules of the road. The speed of approach of vehicles is chosen equal to 120 km / h. At higher speeds, the start of switching should be shifted to the left, i.e. The distance from which the switching starts is extended.

From the graphs in FIG. 2 it can be seen that the range of visibility with this method (curve g) is slightly reduced compared with the method of switching both headlights from the main beam to the dipped beam at the moment when the light beam of the main beam provides the same visual range as beam beam (curve in).

At the same time, the ratio of the speeds of reducing the luminous flux, yes., To the light of non-rare headlights is important. According to experimental data, it is optimal to reduce the luminous flux of the headlamp closest to the oncoming traffic, 1.6-2.5 times faster than other headlamps.

At the same time, on the one hand, a sufficient range of visibility is maintained in the process of switching, and on the other, closeness is significantly reduced or, in other words, a minimum distance between oncoming vehicles is achieved, from which dimming can not be made to dipped beam without dazzling the oncoming driver with high beam headlights .

FIG. 3 shows a diagram of the device that implements the method of doping. The scheme for implementing the proposed method contains a power source 10, an AND switch, a light switch 12, the first; 1 a high beam 13, closest to the oncoming traffic lane; a power supply circuit; a night delay element 14, a second high beam lamp 15, The power supply circuit of which includes the delay element 16, the first lamina 17, closest to the oncoming traffic, and the second lamina 18 of the dim light.

The price of the low beam lamp 17 includes a key element 19, the control input of which is connected to the high beam lamp 13, and the key element 20 of the low beam 18 lamp includes a key element 20, a control

The entrance is connected to the right high-beam lamp 15.

Delay element 14 provides, when disconnecting the voltage at its input, a gradual decrease in the output voltage to zero during Ti 2-2.5 s, delay element 16 ensures, when disconnecting the voltage at its input, a gradual decrease in the voltage at its output to zero after T2 time 4-5 s. Each of the key elements 19 and 20 is open when the voltage at its control input does not exceed the threshold value. If the voltage at the control input of the corresponding key element 19 or 20 is greater than the threshold value, then the element is closed.

The operation of the device is as follows.

The switch 11 is turned on and the switch 12 is installed in one of two positions. Power from the power supply 10 is supplied to the high beam lamps 13 and 15 or to the dipped beam lamps 17 and 18. When switching from the main beam to the middle switch 12, the voltage is removed from the inputs of the delay elements 14 and 16, however, the output of the elements 14 and 16 decreases smoothly, as a result of which the luminous flux of the high beam lamps 13 and 15 decreases. At the same time

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The switch 12 also supplies the voltage to the input of key elements 19 and 20; however, until the voltage at the control inputs of the corresponding key element 19 and 20 decreases to a threshold value, the key element is locked and the corresponding dipped beam lamp 17 or 18 does not light up. It was established experimentally that the luminous flux of the main beam is reduced to the level of the luminous flux of the dipped beam in the range of visibility at a voltage of 4.5 V on the main beam lamps and this value is selected as the threshold value of the key element.

When the voltage at the output of the delay element 14 (i.e. on the lamp 13 closest to the oncoming driving beam) reaches a value of 4.5 V, the key element 19 connected by controlling the input to the lamp 13 opens and the lamp 17 lights up Sveta. After a time, the voltage at the output of the delay element IG (i.e., the voltage on the other high-beam lamp 15) also reaches a threshold value, as a result of which the key element 20, connected by the control input to the high-beam lamp 15, opens and the right lamp lights up 18 dim light.

74-0

730120 PO 7000080 7060

50L, M

250 2ZQ 2W 190 770 750 J30 770 90 10 50 50 W

Fiyo. 2

FIG. five

Claims (1)

METHOD FOR SWITCHING THE LIGHTING OF THE ROAD BY VEHICLE NII LIGHT, consisting in the fact that they reduce the luminous flux of the high beam of both front headlights of the vehicle to a level that provides the estimated range of visibility, and then turn on the dipped beam, characterized in that, in order to reduce the blinding effect of the high beam headlights when driving vehicles, reduce the luminous flux of the high beam of the headlamp closest to the oncoming traffic lane at a speed of 1.6-2.5 times greater than the other front headlamp of the vehicle. FIG. /