Audi Nsu Auto Union Aktiengesellschaft

Audi Ag

Axel Bier

A circuit arrangement for indicator lights in motor vehicles comprises four differently dimmable groups of lights I for tachometer and speedometer illumination 1, 2, II for the remaining dashboard illumination 3, 4, III for the center panel and foot space illumination 5, 6, and IV for the illuminating lights 7, 8 in a radio unit. These lights can be connected to a voltage source via a potentiometer 9 and an electronic amplifier 12. The amplifier has a number of different characteristic curves, corresponding to the number of groups of lights. The shape of these curves is such that, when the potentiometer 9 is turned from its null position into its end position, at first only the voltage for the first group of lights I, that is for the speedometer and tachometer illumination 1 and 2, is increased from zero to a average value. The remaining groups are switched on sequentially. In this way, the brightness of the separate groups of lights can be adjusted individually, with priority for the brightness of the tachometer and speedometer illumination.

Circuit arrangement for indicator lights in motor vehicles

A cooling system for a water-cooled vehicle engine has a radiator through which cooling water flows and which can be exposed to cooling air by an electric fan (9). A first heat sensor (F1) on the engine block senses the water outflow temperature, while a second heat sensor (F2) senses the radiator outflow temperature. The sensed values from both sensors are fed to an electronic control unit (11) which also stores temperature threshold values for both sensor, at which certain functions have to be performed. In the event of failure of either sensor, the electronic control unit (11) takes over the function of the sensor: from the temperature value sensed by the other sensor a temperature equivalent value is formed by adding or subtracting the temperature difference which exists between the two sensors at running temperature. The control unit then activates the appropriate function if the relevant threshold value is reached or exceeded.

Cooling system for a water-cooled vehicle engine

Switching device for lighting the interior of a motor vehicle

This invention pertains to a circuit for controlling an electric device in a motor vehicle such as a light. The circuit has a control switch, a door switch and a semiconductor switch. The control switch activates the device either directly, or through the door and semiconductor switches. The control switch also has a neutral position in which the device is deactivated and the semiconductor switch is off reducing the current drain of the device on the motor vehicle battery.

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Gundelsheim, Germany

Axel Bier