Device for protecting the headlight cleaner from burnout. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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Which of the motorists who have electric headlight cleaners does not know the unpleasant phenomenon when the brushes are frozen and the engine is turned on (either by accident, or when the windshield washer is turned on with the dipped headlights on). The blocking contacts closed due to backlash and deflection of the wiper arm, and the engine stopped with the power on. The fate of the headlight cleaner is a foregone conclusion: due to the high internal resistance, the regular fuse does not blow out until the armature winding is completely burned out. Such an engine is expensive, so convenience is usually abandoned forever.
Having rewound such engines twice on my "Niva", I installed a device on them (see figure). More than 10 years have passed, and the engines are working.
When power is supplied to the engine, the D1 chip is powered through the R5VD2 parametric stabilizer. The counter is set to its initial state by the charge current of the capacitor C2. At the same time, pin 5 of the microcircuit has a low logic level, transistor VT1 is closed, and VT2 is open. The motor starts to rotate. The counter counts the pulses of the clock generator with the timing elements C1, R1, R2.
If there is no interference with the rotation of the motor, then at the moment of reversing the contacts of the switch S1 due to the recharging of the capacitor C2, the counter is reset again, and the motor continues to rotate. If the blocking contacts do not switch within 10-15 s, then the counter is filled, and a high logic level appears at its output, which leads to the opening of VT1. Transistor VT2 closes. The motor is de-energized. In this state, the counter can be for a long time due to the VD1 diode, which disrupts the oscillations when filled.
The cycle of operation of the device is repeated when the voltage is removed for a short time (switching off the dipped beam headlights).
Transistor VT2 works without a radiator. VT1 - any low-power silicon with long leads for surface mounting. The whole device is mounted without a board inside the motor housing on the mounting lugs of the motor and the limit switch.
It is useful to assemble the same device for the windshield and rear window cleaner motors, although they fail due to freezing of the relay brushes due to the fact that the brushes are in front of the eyes, and the driver manages to release them before the engine burns out.
Author: V.M. Paley, Chernihiv
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