Side mirror drive repair. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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This device is designed to control the side mirror drive motor of a NISSAN BLUEBIRD car made in Japan. This car has both separate adjustments for the position of the left and right side mirrors from the driver’s seat, and a common switch that allows you to either press them against the body (close) or return them to the working position (open). In the mechanism of the drive of each mirror there is a node that turns off the electric motor when it, turning, reaches the stop.
My car failed the left mirror drive control unit. At the same time, the right one was regulated, opened and closed normally. Instead of a failed node, I made and installed a self-made one on three electromagnetic relays.
The SA1 mirror control switch (see diagram) is located on the instrument panel and has three fixed positions. In the middle position, power is not supplied to the mirrors, the right position of the switch handle is indicated on the instrument panel as “mirrors open” and the left position is “mirrors closed”. Depending on the position of the switch handle, the polarity of the motor drive supply voltage changes and it accordingly turns the mirror either to the "open" or "closed" position.
If the switch SA1 is moved to the upper position according to the diagram, as a result of the flow of the charging current of the capacitor C2, the reed relay K1 is activated for a short time. This time depends on the capacitance of the capacitor and the resistance of the relay winding; with the selected ratings, it is equal to 1 ... 2 s. With contacts K1.1, it turns on relay K2, which is self-locking with contacts K2.1, and with contacts K2.2 it turns on the electric motor M1 of the mirror drive.
After charging the capacitor C2, the relay K1 releases the armature and the current through its winding will be determined mainly by the resistance of the resistor R2. Resistor R2 is chosen so that this current is less than the holding current of the relay.
After the motor turns the mirror all the way, the current through the motor winding increases sharply, which leads to the operation of the short circuit reed relay. With contacts K3.1, it de-energizes relay K2, contacts K2.2 open and the engine stops. Even if the switch SA1 is left in the extreme position, the engine will be turned off, and the current consumed by the device will not exceed 1 ... 2 mA.
If we now move switch SA1 to the lower position according to the diagram, then the polarity of the voltage supplied to the node will change, but the order of operation of the device will remain the same. The only difference is that relay K1 will turn on with the charging current of the same capacitor C1 and the rotor of the electric motor will begin to rotate in the opposite direction.
Resistors R1 and R2 are needed to quickly discharge the capacitors C1, C2 after the power is turned off. Contacts K1.2 prevent premature shutdown of relay K2 by a large starting current of the electric motor flowing through the winding of relay K3 and leading to its short-term operation.
The drive uses a reed switch RGK15 (K1), passport Bg4.569.003-01, RES32 (K2), version RF4.500.335-01. Relays K1 and K2 can be applied to any others for an operating voltage of 12 V. The main requirement for K2 is that the allowable current through the contacts must be at least the operating current of the motor. Relay K3 is homemade and is a coil of 15-20 turns of any insulated wire with a diameter of 0,6-0,8 mm, wound on a mandrel with a diameter of 5 mm (winding length - 10 ... 15 mm) and impregnated with Supermoment glue. Inside this coil, a reed switch KEMZ is installed with switching contacts, of which closed ones are used.
Setting up the device consists in selecting the number of turns in the coil of the K3 reed relay. With too many turns, it will turn off the motor immediately after turning on. Consistently reducing the number of turns, they achieve stable operation of the engine in normal mode and reliable shutdown in extreme positions.
Author: M. Fedotov, Seversk, Tomsk region
See other articles Section Automobile. Electronic devices.
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