DE2325490A1 - MOTOR VEHICLE LIGHTING SYSTEM - Google Patents

Description

COI-IAOSZ & FLORACK

- '"4 DÜSSELDORF SCHUMANNSTR, 97

FATENTANWÄLTÄ Dipl.-Ing. W. COHAUSZ Dipl.-Ing. W. FLORACK Dipl.-Ing. R. KNAUF · Dr.-Ing., Dipl.-Wirtsch.-Ing. A. GERBER

The Lucas Electrical Company Limited

Ivell Street

GB-Birmingham '18th May 1973

Motor vehicle lighting system The invention relates to a motor vehicle _{lighting system 0}

It has been found that then, if there is a blackout resistance is used in series with a vehicle brake light at night, which increases the time it takes for the brake light to come on burns. When vehicles travel at high speeds, it can be dangerous and the object of the invention is to to eliminate this danger »

A motor vehicle lighting system according to the invention is characterized by a switching device which can be actuated when both the vehicle light switch and the brake light switch of the vehicle are closed in such a way that a darkening resistor is connected in series with the brake light, the switching device a delay device is assigned such that the darkening resistor is not in the circuit for a period of time is switched on, which is sufficient to enable the brake light to burn »,

Preferably, the switching device also controls' darkening resistors in series with the rear direction indicator lights of the vehicle, and the delay device can also be operated ₅ so that the corresponding darkening resistor is kept in the circuit during the dark period, usually ₉ when a direction indicator light is on "

27 218

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23254

The invention is shown below on the basis of an exemplary embodiment explained in more detail with reference to the diagram in the drawing.

The negative pole of the battery 11 of a motor vehicle is on Ground applied and with its positive pole on the light switch 12 of the vehicle with the parking lights 15 and 14 on opposite Sides of the vehicle in front and with the taillights 15 and 16 connected on opposite sides of the vehicle at the rear. The return lines for all lights in the system are grounded.

The positive pole of the battery is also connected to the movable contact of a turn signal switch 23 via a flasher unit 22. Depending on the vehicle, the connection from the battery to the flasher unit 22 can go through the ignition switch of the vehicle. The turn signal switch has an off position, which is shown, a first switch position in which a circuit is closed from the battery to the indicator light 24 at the front of the vehicle and via the resistor 28 to the indicator light 25 at the rear end of the vehicle, and a second switch position in which a circuit to the indicator lights 26 and 2J at the front or rear on the opposite side of the vehicle is closed, the circuit to the light 27 going through a resistor 29. Furthermore, the brake lights 19 and 21 of the vehicle are connected in parallel, and they are connected to the positive terminal of the battery via a series circuit to which a resistor 18 and the brake light switch I7 of the vehicle belong. The resistors 18, 28 and 29 are parallel to normally closed relay contacts 34 »35 and 36, respectively, these contacts being controlled by a relay winding 4I. They are shown in the position they occupy when the relay winding 4I is energized.

One .End of the relay winding 4I is connected to the anodes of two diodes 5I and 32 connected, the cathode of the diode 3I connected to the connection connected between resistor 28 and light 24 while

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the cathode of the diode 32 with the connection between the resistor 29 and the light 26 is connected. The other end of the winding 41 'is "fc connected to the emission electrode of an npn transistor 42 whose collector is connected via a diode 43 and the switch 12 is connected to the positive pole of the battery ₀ The control electrode of transistor 42 is connected through a resistor 44" and - A capacitor 45 i * ¹ series connected to the junction between the diodes J2 and 51, further through the resistor 44 and a resistor 46 in series with the cathodes of three diodes 47? 48, 49 'The anode of the diode connected 47 is ^ ^m i "t OCE connection between the light 24 and the resistor 25, the anode of diode 48 is connected to the connection of the light 26 and the resistor 28 and the anode of the diode 49 is connected to the connection between the brake light switch 17 and the resistor 18.

When the light switch 12 of the vehicle is off, the Helaiswieklung 4I is de-energized, and contacts 35 »36 and 34 are all closed in order to short-circuit the respective resistors 28, 29 and 18. When the brake light switch I7 is closed, burn the lights I9, 21 with full light intensity. When the turn signal switch 23 is moved into a switching position, lights 24 and 25 or lights 26 and 27 are on, the rear lights Lights burn at full intensity.

When the light switch 12 is closed, the lights will be on. I3, 14, 15 and 16. Assuming that the brake light switch 17 is now closed to keep lights 19 and 21 on. In this During this phase, the contact 54 is kept closed because the winding 41 is not energized, and so all the current flows to the lights 19, 21. However, current also flows through the switch 17 and the Diode 49, resistor 46, capacitor 45 and then across the Diodes 31 and 32 and the direction indicator lights zur Hasse. • The current flowing through the direction indicator lights is sufficient of course not to let them burn. The capacitor 45 charges up in a short time, and current then flows through the Wi-

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the stand 44 »™ to switch on the transistor 42 so that the winding 4" f is excited. The return path = for the winding 41 again goes through the direction indicator lights via the modes 31 and 32 »As soon as the 'winding 41' is excited, the contact J4 »opens and the resistor 1ü is connected in series with the lights 19 and 21, in order to cause them to be darkened. The delay time effected by the Eondensaetor 45 is chosen so that the lights 19 and 21 burn without delay, then become darker so that they do not dazzle a subsequent driver.

The mode of operation of the direction indicators / relighters is the same, so when lights 2 and 25 are switched on, they are both connected to the power source, with resistor 28 being briefly closed. Current flows, but now through the diode 48 »™ to excite the winding 4I after the certain delay, whereby the resistor 28 is switched into the circuit. Then the light 24 burns with full light intensity, but the light 25 burns with a lower light intensity uöd 27 are switched on, the winding 4I is excited after a delay due to the current flowing through the diode 48.

yienn, the contacts 35 and 36 are in their open state, they are connected to one another via a resistor 37. if the resistor 28 is connected in series with the light 25 takes place when lights 24 and 25 are switched on, a reduction in the total current, which flows through the flasher unit 22. This is taken into account by the current flowing through resistor 37, so that the frequency the flasher unit 22 is essentially not changed.

In a variant, the circuit is designed so that the winding 41 only actuates contact 34 directly, but also another Contact actuated, which in turn actuates another relay that controls the contacts assigned to the flashing lights.

The circuit can also have a warning switch to connect an additional flasher unit to all direction indicators

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BATH ORIGINAL

have lights at the same time. In this Pallw rd the Yerthmkeltingsrelais not excited "

Expectations

309848 / 0S69

Claims (4)

Expectations 1. Motor vehicle lighting system, characterized by a switching device, which can be operated when both the vehicle's driver and brake light switch are closed, so that a blackout resistor was in line with the brake light is switched, the switching device being assigned a delay device such that the darkening resistor is not switched on in the circuit for a period of time, i.e. the aligns to enable the brake light to burn. 2. Plant according to claim 1, characterized in that the switching device also blackout resistors. in series with the rear ones direction indicator lights of the vehicle controls, and that the Delay device can also be actuated so that. the corresponding blackout resistance during the dark period in the circuit is held when a direction indicator light is on. 3. Plant according to claim 1 or 2, characterized in that the Delay device has a capacitor. 4. Plant according to claim 3> characterized in that the capacitor controls the conduction of a transistor, wherein the transistor conducts after the specified period of time and energizes a relaxation winding, which is used to short-circuit the relevant or each obscuration resistor. 309848 / 0b69