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control block

Schematic dixagram of the block (Fig. 233) includes a control circuit intermittent wiper operation (NRM) and a control circuit shutdown washer and wiper (SVR). The scheme is made on NRM FG1 thyrxistor, transxistor VT5, VT6; diode VD4, VD7 and VD8; capacitors C6-C8 and resxistors R13-R20. In the work of intermittent wiper (position III switch IZHSL-1) thyrxistor FG1 via plug xcontacts 3 and 7 of the unit turns consistently in the minus circuit wiper motor IZHSL-1. When you connect the voltage on pins 3 and 7 of block appears tension coming through the windshield wiper motor with an open terminal switch (home position wiper blades). The first voltage divider resxistors R17 and R18 and a second divider capacitors C6, C7 shift in the initial period of transition of the base - emitter transxistor VT5 in the opposite direction, which ensures the closed state transxistor VT5, VT6 transxistor and thyrxistor FG1. It starts with the charge of capacitor C7 and C6 capacitor discharge through resxistors R13, R14, diode VD4 prior to the first circuit and a resxistor R15 to the second circuit. As the charging and discharging the capacitor C7 C6 shift base - emitter transxistor VT5 shifts in the forward direction, which leads to the discovery of transxistor VT5, which in turn enables the discovery of the transxistor VT6 FG1 and the inclusion of the thyrxistor. Included FG1 thyrxistor motor mounts wiper to the supply voltage and the wiper begins to work. After a certain time limit switch closes the xcontact of the wiper 3 blocks from the terminal - a source of tension. This will provide off thyrxistor FG1 in the future - a return to the starting position of brushes. In the initial position of the wiper limit switch is opened, wiper motor stops, and the xcontacts 3 and 7, Block reappears stress. In the future, the cycle repeats. The scheme is executed on SVR transxistors VT1-VT4, capacitors C1-C5, resxistors R1-R12, diode VD1-VD3, VD5, VD6 and Reed in the coil L. xcontact one block connects to the conclusion that "+" voltage source. xcontact 5 unit connected to one of the conclusions of the winding of the electromagnetic relay P1 type RS527. Pin 6 is connected to another block of output relay coil R1, as well as with the conclusion - electric washer and O-6 switch IZHSL 1. Pin 4 is connected to the terminal unit - a voltage source through the relay R1 (See ris.199, 200). When the xcontact closes 6 (see Fig. 233) switch IZHSL-1 with the conclusion - voltage source at position 0 switch on the circuit voltage is applied to SVR. In this scheme, regardless of SVR voltage is applied to the washer motor, which starts to work and serve surrounding fluid on the windshield. Charging current of capacitor C1 through resxistor R1, the emitter - base transxistor VT1, R4, C1, VD1 opens the transxistor VT1, which provides discovery of the transxistor VT2 through resxistors R5, R6. Open the transxistor VT2, in turn, provides a deduction in the open state transxistor VT1, as well as the discharge of the capacitor C1. The voltage divider resxistors R5, R6 in the open-collector circuit of transxistor VT1 and resxistors RIO, R11 (Capacitor C4 is discharged) shift shift base - emitter of transxistor VT4 the opposite direction, which ensures its closed state, and hence closed and the transxistor VT3. Since the discovery of transxistor VT1 for the relay winding P1 starts leak current, which causes activation of the relay. xcontact RP1 relay R1 closes and opening the xcontact switch 6 provide power to the circuit SVR. There is a self locking power supply circuit SVR, as well as connection to the supply voltage electric windshield wiper through the coil L reed switch and the diode VD6, as well as the windscreen wiper motor through diode VD3. Flowing through the coil L reed switch closes the current xcontact in the reed, and the closure limit switch wiper IZHSL-1 current begins to flow through it xcontacts and the xcontact reed switch opens due to the lack of current in the coil L at the time of closed state of switch. When the reed switch xcontact is opened is an abrupt rise in voltage by a certain amount with a further drop on the emitter of the transxistor VT4, due to the current charging the capacitor C5 through Resxistors R11, R12. The jump is determined by the voltage on the emitter voltage divider (resxistors R11, R12) and the voltage across the capacitor C4. The process of charging the capacitor begins with the opening of a transxistor VT1 Resxistors R10, R11. After the first two operations and opening the reed switch (for a double stroke wiper) is a single operation, and one drop reed xcontact. In the third reed switch xcontact is opened at the time of xcontact closure terminal switch the voltage on the emitter of transxistor VT1 is sufficient for its open, allowing the transxistor VT4 opens, causing the opening of the transxistor VT3. There is a process of opening an avalanche transxistors VT3, VT4, which held in the open state of the capacitor discharge current C4. Open Transxistor VT3 takes control of the potential of transxistor VT2. The transxistor VT2 closed, which leads to the closure of transxistor VT1 after a certain time, time due to charge the capacitor C1 through resxistor R4 to the base circuit transxistor VT1. Closed transxistor VT1 relay coil de-energizes the P1, the relay xcontacts are opened, turns off all loads and de-energized circuits with SVR. Electric motor wiper continues to feed through the limit switch and provides return wiper to its original position, which allows to clean off the remaining sprays washer fluid from the glass. Repeated short-term circuit pin 6 to pin one switch cycle as described washing and cleaning Glass is repeated. 6 position switch 111 IZHSL-1 mode of washing and cleaning glass is similar to that described above. The provisions of the switch I and II IZHSL-1 limit switch wiper IZHSL-closed xcontacts of a switch, thus providing large and small wiper speed. A short-circuit pin 6 to pin A switch circuit SVR unit also provides washing windows, the only difference is that there is no synchronization of the motor off at the moment circuit limit switch wiper, since the xcontact reed switch does not fires due to lack of current in the coil L reed switch (coil shorted L switch xcontacts IZHSL-1). In this case the discovery of the transxistor VT4 provided only the voltage across the capacitor C4, due to its charging current flowing through resxistors R10-R12. Diodes D3, D4, D6 are separating. The diode VD1 is used to provide treatment cut-off transxistors VT2, VT3. Mode cut-off transxistor VT1 is provided voltage divider resxistors R1 and R2. Diode VD2 is to absorb the stresses reverse polarity of the electric motors. Capacitors C2, N, C8 needed to eliminate false positives block scheme when a high voltage power supply circuits in the high-frequency pulses positive polarity, caused by the ignition system and the switching of anchor windings of electric motors. Capacitor C1 in conjunction with the scheme include ensuring the inclusion of transxistor VT2 transxistor VT1 and protection against short circuit in the collector circuit of transxistor VT1. Москвич-412
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