Prefix octane-corrector. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Prefix octane-corrector. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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The schematic diagram of the device is shown in the figure. The prefix consists of a DA1 timer, a delay switch on transistors VT1, VT2, a transistor switch VT3, VT4 and an oscillator on the elements DD1.1 -DD1.3.

(click to enlarge)

After turning on the power transistor VT2 will be closed. The mode of the transistor VT1 is selected so that when the transistor VT2 is closed, it is open.

If the SF1 contacts of the breaker are closed, then the voltage at pins 2 and 6 of the DA1 timer is close to zero, and at pin 3 there is a signal corresponding to a high level. Under the action of this signal, the transistor VT3 is open, i.e., the state of the transistor key is equivalent to the closed contacts of the breaker for the ignition unit. At the first moment after opening the contacts, the output 2 of the DA1 timer will have a signal 1, and the output 6 will have a signal 0, since the capacitor C2 is discharged. Therefore, a high level signal will also remain at pin 3 of the timer, but until the increasing voltage at pin 6 equals the voltage at pin 5. From this moment, a low level signal is set at pin 3 of the timer and the transistor switch closes.

Thus, by changing the resistance of the time-setting circuit R2C2, it is possible to adjust the delay in the moment of closing the transistor switch relative to the moment of opening the breaker contacts. With the ratings indicated on the diagram, the delay control zone is within 0,03 ... 0,8 ms.

With an increase in the frequency of rotation of the motor shaft, the frequency of operation of the chopper also increases. timer output,

repeating this frequency, passing through the rectifier (VD1, VD2), charges the capacitor C3. At a certain frequency, the voltage across capacitor C3 will be sufficient to trigger the delay switch. Transistor VT2 opens and remains open, and VT1 closes and disconnects capacitor C2 from the common wire. The timing chain is broken. In this case, the operation of the transistor switch is synchronous with the operation of the breaker contacts.

Resistor R7 allows you to change within 80 ... 160 Hz frequency threshold off delay. When switching to gasoline with an octane rating lower than recommended, the delay time must be increased. The engine speed at which knocking is not felt is determined empirically and is approximately 3000 min-1, which corresponds to a chopper frequency of 100 Hz.

The autogenerator DD1.1-DD1.3, together with the electronic ignition system, creates a multi-spark mode in the candles, which makes it easier to start a cold engine. When the SB1 button is pressed (only at startup), the ignition system generates a series of sparks instead of a single spark, following at a frequency of about 50 Hz (at -10 ° C).

The device used fixed resistors MLT, variables SPZ-4, capacitor C2 - K73-9. Transistors KT3102B can be replaced by other silicon of the corresponding structure with a current gain of at least 70, and KT815A - by KT817A-KT817V. Instead of the K155LAZ chip, you can use K155LA4.

In the manufacture of attachments, special attention should be paid to the reliability of contact connections, the quality of soldering and protection from environmental influences.

Authors: A. Kovalsky, A. Frolov; Publication: N. Bolshakov, rf.atnn.ru

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