Prefix octane corrector for the car. Free Technical Library article

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Prefix octane-corrector for a car

Free technical library

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

Comments on the article

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 the power is turned on, the 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 the opening of the contacts, the output 2 of the DA1 timer will have a signal 1, and the signal 6 at the output 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 timing 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 C2. At a certain frequency, the voltage across the capacitor C1 will be sufficient to operate the delay switch. Transistor VT2 opens and remains open, and VTXNUMX closes and disconnects capacitor CXNUMX 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 you press the SB1 button (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.

Publication: cxem.net

See other articles Section Automobile. Electronic devices

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

An insulating material that is a conductor at its edges 14.06.2018

Physicists at the University of Zurich have discovered a material that belongs to a new class of higher-order topological insulators. The faces of crystalline solids made of these materials conduct electrical current with almost no resistance, while the rest of the material remains an insulator. Such unique properties of new materials can be very useful for creating new types of electronic devices and, of course, for creating quantum computing systems.

Topology, a science that is part of materials science, deals with the study of the properties of solid particles and bodies protected from deformations and the effects of various external factors. One of the directions of this science is the study of topological insulators, crystalline materials that conduct electric current only in the surface layer. At the same time, due to some physical effects, conductive surfaces cannot be transferred to an insulating state.

Theoretical calculations carried out by physicists have shown that the properties of higher-order topological insulators must be extremely stable. In other words, the electrical conductivity of the crystal faces should not be affected by impurities and other disturbances of the crystal lattice. In addition, the crystal faces do not need additional processing or any initiation to obtain conductive properties. And even if the crystal suddenly breaks, the electric current will still continue to flow through it along the newly formed faces.

These studies are now mostly in the theoretical field. But researchers have already proposed one material that could be a higher-order topological insulator, tin telluride. "Soon we will find other materials with similar properties" - says Professor Titus Neupert (Titus Neupert), - "The edges of these materials will work as a kind of "highway" for electrons, i.e. they can be used as moreover, topological insulators can be combined with magnetic, semiconductor and superconducting materials, which will allow them to be used to create quantum computers."

News feed of science and technology, new electronics

We recommend downloading in our Free technical library:

▪ section of the site Factory technology at home

▪ magazines Technique - youth (annual archives)

▪ book What is a cathode ray tube and a cathode ray oscilloscope. Weinstein S.S., 1949

▪ article by John Steinbeck. Famous aphorisms

▪ article Discoloration of shellac. Simple recipes and tips

▪ article Reflectometer for measuring SWR in the frequency range 1-60 MHz. Power 0,001-200 watts. Encyclopedia of radio electronics and electrical engineering

▪ reference Entering the foreign TV service mode. Book #32

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews