RU2565777C2 - Ignition system for internal combustion engine with increased discharge energy - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: ignition system for internal combustion engine contains the electronic control unit connected to the cranked shaft position sensor and the battery, the standard ignition unit with high-voltage coils, elements of battery supply circuits. The system in addition contains at least one additional ignition unit with high-voltage coils. Its input circuits are connected to the respective input circuits of the standard ignition unit, and the output circuits are connected to the respective output circuits of the standard ignition unit.

EFFECT: improvement of reliability of sparking at high charge leakages along the plug insulator surface because of formed deposit, increase of energy of electric discharge.

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Description

The invention relates to ignition systems of internal combustion engines and can be used to ignite lean fuel mixtures.

In automotive electronic ignition systems, the discharge energy is about 50 mJ with an electric discharge duration of up to 1.6 ms. However, to significantly improve the parameters of internal combustion engines when working on lean fuel mixtures, they strive to significantly increase the energy of the spark discharge.

Known plasma ignition systems for an automobile engine having a high voltage discharge source and a relatively low voltage source (several hundred volts) of high current for plasma formation [Application US 20080141967 A1, IPC ⁶ F02P 23/04. Plasma ignition device / Yasuhide Tani, Hideyuki Katoh, Tooru Yoshinaga. - declared. 12/10/07; publ. 06/19/08; Application US 20090021133 A1, IPC ⁶ H01T 13/20, F02P 3/02. Plasma ignition system / Hideyuki Kato, Tohru Yoshinaga. - declared. 07/17/08; publ. 01/22/09.]. Both sources are connected to the spark plug in parallel. A high-voltage breakdown in the spark plug is formed using the ignition coil. As soon as the voltage in the spark gap drops to a level lower than the voltage of the low-voltage source, additional energy begins to be supplied from the latter, stored, as a rule, in the capacitive storage. As a result, an increased amount of energy is released in the spark gap of the spark plug for the formation of a plasma discharge and reliable ignition of depleted fuel-air mixtures.

The disadvantage of these ignition systems is that due to oscillatory processes in electric circuits, a low-voltage energy source does not always have time to maintain spark burning during a sharp voltage drop in the spark gap after a high-voltage discharge.

Known plasma ignition systems for an automobile engine having a source of high voltage discharge and a relatively low voltage source (several hundred volts) of high current for plasma formation [US Pat. US 4448181, MKI F02P 3/08. Plasma ignition system for an internal combustion engine / Yasuki Ishikawa, Hiroshi Endo, Masazumi Sone Iwao Imai. - Declared. 06/07/1982, publ. 05/15/1984.], In which a low-voltage power source is connected in series with the secondary winding of the ignition coil. In them, the low-voltage energy source is located in the same oscillatory circuit with the high-voltage discharge source, which makes it possible to coordinate the oscillatory processes occurring in both sources and to ensure stable burning of the spark with the supply of additional energy from the low-voltage source. The result is increased energy release in the spark gap of the spark plug for reliable ignition of lean air-fuel mixtures.

The disadvantage of these ignition systems is that in the event of adverse conditions for high-voltage breakdown of the spark gap of the candle, for example: with increased leakage of charge on the surface of the insulator (skirt) of the candle due to carbon deposits, spark formation can stop. Low-voltage energy sources in this case will be useless.

Known ignition systems operating in the multi-spark mode [Pat. 4442821 US MKI F02P 5/04. Internal combustion engine ignition method / Hamai Kyugo, Nakagawa Yasuhiko, Nakai Meroji, Inoue Ryuzaburo. - Declared. 12/30/81; publ. 04.17.84.], In which several sparks are used for ignition (usually 3-6), following each other after a short period of time. Each spark is formed by high-voltage breakdown (in the capacitive phase) and has an inductive phase in which the main discharge energy is released. The total ignition energy is formed by summing the energies of each spark. As a result, a greater amount of energy is released in the spark gap of the spark plug, but the total duration of the multi-spark discharge is up to 10 ms, which allows it to be used effectively only to start the engine. At frequencies of rotation of the crankshaft of more than 400-500 min ^{-1 the} use of such an ignition system is impractical.

Closest to the proposed technical solution is a plasma ignition system [Pat. EP 0434217 B1, MKI F02P 9/09. Plasma ignition device / Rosswurm Mark A., Tozzi Luigi. - Declared. November 20, 1990, publ. 06/26/1991], comprising a voltage converter, a control unit, a spark plug and three ignition units: a high-voltage discharge source, a main plasma ignition energy source and an auxiliary plasma ignition energy source. Each of the three ignition units is connected in parallel to the spark plug through its own diode. When the system is operating, a high-voltage discharge from the unit first occurs. With a short time delay, the spark is recharged from an auxiliary plasma ignition energy source to exclude a sharp voltage drop in the spark gap. Further, additional energy is supplied to it from the main source. As a result, the total amount of energy from the high-voltage discharge source, auxiliary and main plasma ignition energy sources for reliable ignition of depleted fuel-air mixtures is released in the spark gap of the spark plug.

The disadvantage of this ignition system is that in the event of adverse conditions for high-voltage breakdown of the spark gap of the candle, for example: with increased charge leakage on the surface of the insulator (skirt) of the candle due to the formation of soot, spark formation may stop. Auxiliary and main sources of plasma ignition energy will be useless in this case.

The technical task of the invention is aimed at improving the reliability of sparking with increased charge leakage on the surface of the insulator (skirt) of the candle due to the resulting soot, as well as to increase the energy of electric discharge.

The technical problem is achieved in that the ignition system for an internal combustion engine contains an electronic control unit connected to a crankshaft position sensor and a storage battery, a standard ignition module with high voltage coils, battery power supply circuit elements. The system further comprises at least one additional ignition module with high-voltage coils, which is connected in such a way that its input circuits are connected in parallel with the corresponding input circuits of the standard ignition module, and the output circuits are connected in parallel with the corresponding output circuits of the standard ignition module.

The drawing schematically shows the ignition system for ICE with increased discharge energy, where

1 - rechargeable battery;

2 - fuse;

3 - main relay;

4 - ignition switch;

5 - standard ignition module

6 - spark plugs;

7 - additional ignition module;

8 - electronic control unit;

9 - crankshaft position sensor;

10 - master disk;

A - contacts on high voltage coils;

B - contacts on high voltage coils;

C - grounding;

D is nutrition;

E - matching devices.

The ignition system for internal combustion engines contains an electronic control unit 8, which is connected to the crankshaft position sensor 9 and the battery 1, a standard ignition module with high-voltage coils 5. Additionally, at least one additional ignition module 7 with high-voltage coils is installed in the system, which is connected in such a way that its input circuits are connected in parallel with the corresponding input circuits of the standard ignition module 5, and the output circuits are connected in parallel with the corresponding stvuyuschimi output circuits regular ignition module 5.

When the ignition system is operating, information from the crankshaft position sensor 9 about the speed of the crankshaft enters the electronic control unit 8, which supplies a control signal to the standard ignition module 5 (contacts A, B). The signal through the matching device E enters the high-voltage coils of the standard ignition module 5, where a high voltage is generated, which is supplied to the corresponding spark plugs 6. The discharge currents from each of the ignition coils connected in parallel are summed up and compensate for leaks on the surface of the insulator (skirt) of the spark plug 6, thereby ensuring reliable sparking even when there is significant carbon deposits on the spark plugs. After the breakdown of the spark gap of the spark plug 6 in the inductive phase of the discharge, the currents from each of the ignition coils connected in parallel are also summed up and increase the discharge energy almost in proportion to the number of parallel ignition modules 5, 7 with high-voltage coils.

Claims (1)

An ignition system for an internal combustion engine comprising an electronic control unit connected to a crankshaft position sensor and a storage battery, a standard ignition module with high voltage coils, battery power supply circuit elements, characterized in that the system further comprises at least one ignition module with high voltage coils, which is connected in such a way that its input circuits are connected in parallel with the corresponding input circuits of the standard ignition module, and the output circuits and connected in parallel with the corresponding output circuits of regular ignition module.