Digital wiper control unit. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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A simple electronic unit, which I propose to add to the machines of the Ulyanovsk Automobile Plant, will expand the possibilities of controlling the windshield wiper. Despite the fact that the device was developed for cars of the UAZ family, it can also be used on Zhiguli to replace the failed built-in electromechanical regulator.
(click to enlarge)
The node diagram is shown in fig. 1. On the logic elements DD1.1, DD1.2, a low-frequency generator of rectangular pulses is made, which are fed to the input of the counter DD2. A current amplifier is assembled on transistors VT1, VT2. Transistors operate in switching mode.
When a high-level counter appears at output 0, transistor VT1 opens and VT2 follows it - the wiper motor turns on. After some time, the high level at the output 0 of the counter is replaced by a low level, the transistors are closed and the electric motor is turned off, and the counter continues to count.
As soon as a high level appears at output 1 of the counter, this level, after double inversion by the elements DD1.3, DD1.4, will reset the counter and a new pulse counting cycle will begin. If the SA1 switch is moved to a position with a higher number, the time for resetting the counter will come later, i.e., the pauses between successive wiper starts will increase. In position "1" there is practically no pause.
The trimmer resistor R2 sets the required frequency of the generator, and hence the operating time of the wiper motor in each cycle. On the
resistor R7 and zener diode VD1 assembled a parametric stabilizer to power microcircuits.
All elements of the assembly, except for the transistor VT2 and the switch SA1, are mounted on a printed circuit board made of foil fiberglass with a thickness of 1,5 mm. The drawing of the board is shown in fig. 2.
Contact pads 1 - 7 and P, located on the board from the side of the printed conductors near the installation site of the DD2 chip, are designed to be connected to the SA1 switch. It is mounted near the wiper switch. If you do not need such a wide choice of pause duration, you can use the SA1 switch to a smaller number of positions.
For one selected value of the duration of the pause, the switch is not needed at all; only pad P should be connected with a jumper to the corresponding meter output. Let, for example, output 7 be selected - then in each cycle the brushes will make three double strokes on the glass, and the pause will be equal to 5 ... 7 s.
The VT2 transistor must be screwed to a small heat sink in the form of a 60x40x3 mm duralumin plate. The heat sink on four racks is mounted parallel to the board.
All node resistors, except for R2 and R6, are MLT-0,125. Resistor R6 must have a dissipation power of at least 2 watts. Trimmer resistor R2 - any type, better than a closed design and with shaft fixation. Capacitors - KLS or KM. The zener diode VD2 can be any for a voltage of 8 ... 10 V, preferably a miniature one. Instead of the KT815B transistor, any of the KT815, KT817 series is suitable, and instead of the KT818B, any of the KT818 series.
The mounted board is placed in the box from the MKU-48 relay and fixed under the dashboard of the car.
On connecting the node to the electrical system of the UAZ-3151 car. Of the six colored terminals of the wiper switch, three are used - green is connected to the positive wire of the on-board network, gray - to terminal 1 of the board, white - to terminal 2 and the electric motor. The remaining three conclusions are left free. Conclusion 3 of the board is connected to the car body.
With this connection, in the extreme left position of the switch, the wiper is off, in the middle position - continuous operation of the brushes, in the extreme right - intermittent.
When installing the node on Zhiguli cars, instead of the existing electromechanical output, 1 of the board is connected to a red wire, 2 to blue, and 3 to yellow. The operating mode of the wiper in this case will change somewhat. Now, in each cycle, the brushes, depending on the position of the resistor R2 slider, will make 2-3 double strokes with a pause of 2 ... 13 s, set by switch SA1.
The operation of the described unit on a UAZ-3151 car showed good results. The absence of oxide capacitors contributes to the reliable operation of the unit.
Author: A. Petukhov, Biysk, Altai Territory; Publication: N. Bolshakov, rf.atnn.ru
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