Device for setting the ignition timing. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Device for setting the ignition timing. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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Ignition timing device Accurate setting of the moment of ignition of the combustible mixture in the cylinders of a car engine is a painstaking process that requires a certain skill and a lot of time. The device described below allows you to quickly and easily perform this operation in any conditions.

The operation of the device is based on the use of the stroboscopic effect. If instantaneous flashes of light, synchronized with high voltage pulses on the glow plug of the first cylinder, illuminate the alignment marks on the flywheel rim and the running engine housing, then the moving mark will visually appear stationary. If the advance angle is set incorrectly, then by the relative position of the marks it is easy to determine in which direction and by how much it is necessary to turn the ignition advance angle regulator bar.

The scheme of the device is shown in fig. 1. The light source in the device is an H1 flash lamp. The device is powered by a rechargeable battery (voltage 12 V, a negative terminal is connected to the body) of a car whose engine is being regulated. The supply voltage necessary for the operation of the lamp (about 250 V) is provided by a converter on transistors V1 and V2 and a transformer T1 and a rectifier on a diode assembly V3. The ignition impulse is removed from the candle of the first cylinder through the limiting resistors R4-R6.

Ignition timing device
Fig. 1

The transformer is wound on a magnetic circuit Ш 16Х20. Windings / and /// are wound simultaneously in two wires PEV-2 0,5, the number of turns is 21. The winding // is wound in the same way (7 turns of wire PEV-2 0,15), and the beginning of one half-winding must be connected to the end of the other - this connection will serve as a tap. Winding IV contains 500 turns of PEV-2 0,2 wire. Capacitors C2 and C3 - paper for an operating voltage of at least 400 V. It is desirable to select transistors V1 and V2 with similar parameters. Resistor R1 wire, the rest - MLT.

Structurally, the device consists of two units: an illuminator and an adapter. The appearance of the illuminator is shown in the title of the article. It is made in the form of a pistol. The case contains all the details of the device, except for the resistors R4-R6. The base on which the parts of the illuminator are installed is a metal figured plate, located vertically in the case. The placement of parts on the plate is shown in fig. 2. A reflector with a flash lamp is placed in front (used without alteration from the Luch-70 flashlight). Button S1 of the device is mounted in the handle. The case is glued from sheet plastic.

Ignition timing device
Rice. 2. View of the illuminator installation: 1 - diffuser.
2 - reflector with a flash lamp, 3 - storage capacitors,
4 - heat sinks, duralumin. 5 - transistors, 6 - electrolytic
capacitor K50-6, 7 - circuit board, fiberglass,
8 - diode assembly KTs402I, 9 - base plate, duralumin.
10 - transformer. 11 - resistor MLT-23,6 k

The adapter device is shown in fig. 3. In case 3, machined in the form of a tube from a solid heat-resistant insulating material (textolite, getinax), resistors R4-R6 are mounted. The wire connecting the adapter to the illuminator must be insulated for a voltage of at least 15 kV.

Ignition timing device

A steel rod 4 is mounted in the radial hole of the adapter body, ending at the lower end (according to Fig. 3) with a spring clip for fixing it on the output of the engine glow plug, and at the upper end - with a threaded tip 2, similar in shape to the plug output.

A properly assembled device does not require adjustment. Work with the device in the following order. From the candle of the first cylinder (with the engine stopped), remove the contact cap, put an adapter on its output. the device and the adapter are put on a candle cap. Supply power to the device (the plug of the power cord of the device is plugged into the socket of the car's on-board network). On the flywheel housing, remove the viewing window cover and start the engine. Press the power button of the device and direct its light to the flywheel. If the marks on the flywheel and the engine housing do not match, shift the ignition timing adjuster bar until the marks match. Then the engine is stopped and the device is turned off.

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

See other articles Section Automobile. Ignition.

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