Electronic interrupter simulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic interrupter simulator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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The simulator is designed to test the electronic switches of the automotive ignition system using the oscillographic method. To test the switch, it is necessary to apply rectangular pulses with a duty cycle of about three and a repetition rate of 33 or 100 Hz to its input. This corresponds to the rotation of the crankshaft of a four-cylinder engine at a frequency of 500 and 1500 rpm.

Depending on the frequency of rotation of the shaft, the duty cycle of the pulses at the output of the switch must change.

(click to enlarge)

Many radio amateurs have acquired oscilloscopes, but not everyone has the necessary generators. In the proposed device, rectangular pulses are generated by a multivibrator on transistors VT1 and VT2, which are fed to the key - transistor VT3. The collector VT3 of the simulator is connected to the terminal 7G of the switch. Instead of an ignition coil, as a load, you can connect an A12-45 + 40 (EL1) car lamp or close to it in power. The generator frequency is set by switch SA1.

It is possible to detect malfunctions in the switch by comparing the voltage oscillograms at the control points of the circuit of the "naughty" switch with the serviceable one.

Using the SB1 button, the current is turned off through the ignition coil when the engine is stopped. When the button is pressed, the lamp should go out after a few seconds.

Author: P. Sevastyanov, Tashkent, Uzbekistan

See other articles Section Automobile. Ignition.

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