Digital auto-adjuster of the OZ angle (part 2). Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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The regulator is mounted on a printed circuit board made of double-sided foil fiberglass 1,5 mm thick. The board drawing is shown in fig. 3. Resistor R9 - MLT-2, the rest - MLT-0,125. Capacitor C16 - K52-1, the rest - KM-6B or KM-5.

Instead of diodes KD522A (VD1-VD4), any silicon ones designed for a direct current of at least 100 mA (for example, KD102A, KD509A) are suitable, the rest can be replaced with KD503A, KD509A, KD512A. KT3102B transistors can be replaced by any of the KT315 series with a current transfer coefficient of at least 30. The values ​​of capacitors and resistors may differ from those indicated by ± 20%.

The power supply unit of the regulator and digital octane corrector must provide a voltage of 5 V ± 5% at a load current of 0,7 A and an input voltage of 8 ... 14 V. A circuit of one of the block options is shown in fig. 4. Stabilizer DA1 is installed on a heat sink with a total area of ​​about 200 cm2.

Ris.4

The performance of the machine is checked in the same way as the octane corrector: relay contacts are connected to its input, the winding of which is connected to the AF generator through the D226A diode. An oscilloscope is connected to the output of the DD3.1 element and high-level pulses are observed on the screen, the frequency of which is equal to the frequency of the input pulses, and the duration should increase with decreasing frequency. The pulse repetition period corresponds to an angle of 180 degrees, and their duration corresponds to the delay angle.

More precisely, the delay angle can be measured with a digital frequency meter. It is connected instead of an oscilloscope and the period and duration of the pulses at the output of the DD3.1 element are measured. The delay angle (in degrees) is equal to 180t / T where T is the period, and t is the duration (in ms) of single pulses at the output of the DD3.1 element.

By changing the frequency of the generator, a graph of the dependence of the angle 03 on the frequency is built. It should match the graph shown in Fig. 2. Moreover, foz=30-f3, where (foz is the current angle of the OZ, φ3 is the delay angle (the initial angle of the OZ is 30 degrees).

The regulator output is connected to terminals 1 of the DD2.1 element and 4, 5 of the DD3.2 element of the octane corrector, and the elements R6, VT1, C5, R13, R14, SA2 are removed from the corrector.

If the regulator is supposed to be used without a digital octane corrector, then a matching unit should be installed at the output of the regulator, the same as at the output of the octane corrector - DD3.3, DD1.2, VT3, VT4, C7, R20-R23. The output signal of the regulator should be applied to the pin. 10 element DD3.3 node. Although the digital automatic regulator is designed to work with a contact interrupter, it is much more efficient to use it in conjunction with a non-contact sensor-interrupter, for example, from the BES3-1 ignition unit. The diagram of the shaper necessary to match the output of such a sensor and the input circuits of the regulator is shown in fig. 5.

Fig.5 (click to enlarge)

The shaper uses resistors MLT-0,125, capacitors KM-5, KM-6 (C1-C4), K52-1 (C5). KT3102B transistors can be replaced with any of the KT315 series with a static current transfer coefficient of more than 30, and KT817B and KT815A transistors can be replaced with KT801A or KT801B. The HL1 LED, designed for a direct current of at least 10 mA, serves as an indicator for setting the initial ignition timing.

The shaper is installed in the engine compartment of the car near the breaker-distributor.

The input circuits of the BES3-1 electronic unit should be changed: exclude the elements R3-R8, V3-V5, C3, C4 (here the reference designations of the parts correspond to the diagram in the unit's instruction manual). In the vacated space, you should assemble an input node similar to that used in a digital regulator (elements VD1-VD5, C3, C4, R7-R10, R13, VT3 in Fig. 1). The output of the resistor R13, right according to the diagram, should be connected to the positive power wire of the BEC3-1 unit, and the output of the node - the collector of the transistor VT3 - to the base of the transistor VT6.

After such an alteration, the BES3-1 electronic unit can work with the output signals of a digital octane corrector, a contactless sensor shaper, and a conventional contact breaker.

The digital auto-regulator is installed in the passenger compartment, in a place easily accessible to the driver, and connected to the interrupter and the electronic ignition system with a shielded cable.

Before installing the regulator, either dismantle the centrifugal regulator by fixing the cam on the axle, or firmly fix it with crackers. Then set the initial angle 03 45 degrees. relative to TDC (30 degrees - the operating range of the digital regulator; 10 degrees - the angle recommended by the instructions for the Moskvich-2140 car; 5 degrees - to ensure the operation of the digital octane corrector). Next, the initial angle 03 is specified during movement (according to the usual method).

It is advisable to lengthen the current distribution plate of the distributor rotor by about 35 mm in the direction opposite to the direction of rotation of the shaft.

Author: Biryukov, Moscow; Publication: N. Bolshakov, rf.atnn.ru

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