Control unit for glow plugs of a VAZ-341 diesel engine in a VAZ-21045 car. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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Glow plug control unit 25.3763 ​​produced by ChNPPP ELARA is installed on VAZ-21045 vehicles with a VAZ-341 diesel engine manufactured by Barnaultransmash.

The block operation algorithm is as follows: when the key in the ignition lock is moved from the "Off" position to the "Ignition" position, the glow plugs installed one in each cylinder are connected to the battery. At this moment, the control lamp on the instrument panel of the car lights up. After the time interval tnn, called the preheating time, has elapsed, the control lamp goes out, indicating that the engine is ready to start. After this, the glow plugs remain energized for an additional 5 s.

When the starter is turned on, the candles are in the on state and turn off 5 seconds after the starter is turned off. The preheating time tnn is a function of the temperature in the engine compartment of the vehicle (the temperature sensor is installed directly on the control unit board), the corresponding values ​​of tnn are given in table. 1.

The control block diagram is shown in fig. 1. Positional designations of all elements correspond to the scheme of the manufacturer. The main functional units of the block are two timers assembled on 1W4541BN (DDI, DD2) microcircuits, a pilot lamp power supply on transistors VT2, VT3, a short-circuit protection unit for the power supply circuit of glow plugs on VT4, VT5 transistors and a switching unit on a VT6 transistor and a relay K1.

The 1W4541BN chip is a programmable timer with a built-in oscillator whose oscillation frequency is set by RC circuits connected to the RX, CX and RS pins. The conversion factor is determined by the ratio of signals at inputs A and B (Table 2).

When the ignition is turned on, contact XP1.3 of the control unit receives the voltage of the vehicle's on-board network +12 V. Diode VD11 protects the unit from reverse polarity of the supply voltage, stabilizer R23VD10 stabilizes the supply voltage of microcircuits DD1, DD2 at the level of 5,5 V, which ensures the operation of the control unit in range from 6 to 16V according to the requirements of AvtoVAZ.

The R1C1 circuit starts the timer DD1, at the output Q of which a single signal appears, while the output Q of the DD2 chip is also set to a high level, which turns on the transistor VT6 and relay K1. The closing contacts of the relay K1 V23071-A1009-A132 from SIEMENS are designed for connecting a load with a current consumption of 120 A and disconnecting with a current of 70 A. The relay is located directly on the printed circuit board of the control unit. It has no analogues with the same dimensions. The voltage from the battery (contact "KZO" connection XS1) through contacts K1.1 and current-measuring resistor R16 is supplied to the glow plugs.

Resistor R16 is made of 1 mm thick nichrome sheet, its location in the control unit is shown in fig. 2 (1 - resistor, 2 - printed circuit board with elements, 3 - block base, 4 - measuring track). The measured current I flows from the connection XS1 "K30" to contacts B, C, D. Contacts A and E are measuring. The resistance of the resistor R16 is determined by the length of track 4 and can be adjusted by changing the length of the side slots. If the current I exceeds the set threshold of 175 A, the transistors VT4, VT5 open in series and the inputs B of the microcircuits DD1, DD2 are closed to a common wire, after which the output Q of the timer DD2 is set to a low level and the transistor VT6 turns off. The relay opens contacts K1.1 of the power circuit.

In normal mode, after the ignition is turned on and the contacts K1.1 are closed, the transistor VT5 opens with a current pulse through the C11R3 circuit, and then VT2 - the control lamp power supply is turned on. Resistor R12 limits the current through the cold coil of the lamp at the time of switching on. Timer DD1 forms the preheating time interval tnn. The temperature dependence of the frequency of the internal oscillator of the DD1 microcircuit is set by the thermistor R6 232264063683 from PHILIPS. Capacitor C4 - adjusting for the initial setting of the time tnn at a temperature of 20 ° C. At the end of the time tnn, a low level appears at the output Q of the timer DD1 and the timer DD2 starts, forming a time interval of 5 s, at the same time the control lamp on the instrument panel turns off. After 5 s, the transistor VT6 and relay K1 turn off and the candles are de-energized.

When the starter is turned on, a voltage of +12 V is supplied to the contact XP1.4 "K50", the timer DD2 is forcibly set to its initial state and the relay K1 is activated. After the starter is turned off, the spark plugs remain energized for 5 seconds and turn off. The glow plug heater can only be restarted after the ignition has been switched off and on. In the event of a short circuit in the test lamp circuit, the VT3 transistor closes and the lamp is de-energized.

The control unit is placed in a plastic housing, on the basis of which there is a four-pin pin connector for connecting low-current circuits. The power contacts of the control unit are threaded, the XS1 connection has a Mb thread, XS2 - M5. The printed circuit board is installed in the block with elements inside. The unit is fixed in the engine compartment of the vehicle using an intermediate bracket. All elements are designed to work in the temperature range from -40 to +85 °C. The voltage drop across the switching contacts must not exceed 20 mV per 1 A of load current.

Author: P. Vasiliev, Cheboksary

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