Device to control the headlights

The device is compact microprocessor device, performing the function of control of small electromagnetic relay, according to the algorithms used in the program memory of the microcontroller. The device uses two signal electrical circuits, for the implementation of specified algorithms.

The first signal is a control lamp control circuit charging the vehicle battery. Before you start the engine, the output of the lamp connected to the circuit of the field winding of a generator (circuit 61) is '-12' volts (ground) secured by the passage of current through the field windings, to ground the engine. At the same time, illuminates the charge indicator lamp, and the input of the device connected to this circuit, there is a logical 0, which prohibits the switching of relay to control the inclusion of beam. After starting the engine, with the stator winding of the generator, via additional diodes, begins to receive a positive voltage charge, which 'locks' the chain 61 of the control lamp charge. The lamp goes out, and input to the device comes a logical 1, which starts a 10 second timer, after which the relay controls the dipped beam headlamps.

The second signal is a signal to the tachometer, is a sequence of pulses in digital form. If there is no pulse, and low frequency (600 rpm) the instrument prohibits the inclusion of control relay dipped beam. If the speed exceeds 600, it starts a 10 second timer, after which the relay controls the dipped beam headlamps.

The unit provides a service function of prohibiting the inclusion of a passing light of headlights, with the engine running. Is it implemented, enable the special toggle device. This function is useful when performing service and repair work on the car, requiring the engine starts.

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