Extra high-energy spark discharge system

Abstract

The invention discloses an extra high-energy spark discharge system. The system comprises an ignition energy control unit, an inductive discharge unit, a DC (Direct Current)-DC boosting unit, an energy-storage capacitor bank and a combined outward opening-type spark plug. According to the system, by inductive discharge, a spark plug gap is broken down, and a plasma channel is formed between a positive electrode and a negative electrode, and therefore, a high-energy capacitor connected in parallel near the spark plug is caused to discharge. Different from other high-energy ignition systems, the extra high-energy spark discharge system can reach as high as several Joules in single ignition energy, and meanwhile, a stable shock wave can be formed to prompt the formation of a fire core. The extra high-energy spark discharge system can be used for lean combustion occasions with higher flow rate and lower temperature, such as high-latitude gas turbine engine restart, pulse detonation engine start, homogeneous charge compression ignition piston engine ignition, pressurizing direct injection gasoline engine ignition and the like. The combustion stability can be remarkably improved, the combustion efficiency is improved, and pollutant emission during a combustion process is reduced.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, in particular to an ultra-high-energy spark discharge system for an in-cylinder direct-injection gasoline engine. Background technique [0002] As an important part of the internal combustion engine, the ignition system has been constantly evolving along with the advancement of internal combustion engine technology. From carburetor technology, to port injection technology, to the rise of in-cylinder direct injection technology, the ignition system has also experienced a development path from low ignition energy to high ignition energy. The currently widely used ignition technology is based on the inductive spark discharge technology. After the primary coil is energized, the electrical energy is converted into magnetic energy and stored in the coil. When the primary coil is suddenly disconnected, a high voltage of tens of thousands of volts is induced in the secondary coil, wh...

AI Technical Summary

Problems solved by technology

However, various emerging ignition systems have some shortcomings, such as the limited improvement of ignition energy; the matching problem between the ignition system and the spark plug is ignored; after the ignition energy is increased, the adverse effects of strong electromagnetic interference on other electronic components in the vehicle are insufficiently considered; at the same time, There are also certain limitations in cost performance and reliability.

In addition, some international cutting-edge combustion studies have shown that simply increasing the ignition energy, that is, the highest temperature in the ignition area, is not the best way to improve ignition stability

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