Dielectric barrier discharge non-equilibrium plasma spark plug for internal combustion engine

Abstract

The invention discloses a dielectric barrier discharge non-equilibrium plasma spark plug for an internal combustion engine, and belongs to the field of internal combustion engine combustion. An inner electrode of the spark plug is arranged at the center; an ionization cavity is formed in a space between the lower part of a first insulating layer and the lower part of the inner electrode; a bulge is arranged on the surface of the inner electrode positioned in the ionization cavity. A small amount of combustible gas mixture is pressed into the ionization cavity during compression stroke, and the combustible gas mixture is ionized to form non-equilibrium plasma. The formed non-equilibrium plasma has high chemical activity, rushes out from the ionization cavity, enters combustion chamber space, stimulates gas mixture positioned in the combustion chamber space through the high activity of high-energy electron, and begins chain reaction. The non-equilibrium plasma is widely distributed in the combustion chamber space, so that space multi-point ignition is realized. The spark plug can improve the ignition energy of a spark ignited engine, improves the combustion stability and the emission performance of a lean-burn engine, and expands the lean burn limit of the engine, thereby improving the economical efficiency of the engine.

Description

technical field [0001] The invention relates to a dielectric barrier discharge unbalanced plasma spark plug for an internal combustion engine, which belongs to the field of internal combustion engine combustion. Background technique [0002] Lean combustion technology is a new type of engine combustion technology that has attracted much attention in the field of internal combustion engines in recent years. This technology requires the engine to work under the condition that the fuel-air equivalence ratio is less than 1. It can be achieved by increasing the adiabatic index of the charge in the cylinder and reducing the combustion temperature. Economical and low NO X emission. However, there are few combustibles in the mixture under lean conditions. Compared with stoichiometric combustion, the combustion process of lean combustion is unstable, which leads to the increase of engine cycle variation and the deterioration of HC and CO emissions; the mixture near the spark positio...

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Problems solved by technology

However, there are few combustibles in the mixture under lean conditions. Compared with stoichiometric combustion, the combustion process of lean combustion is unstable, which leads to the increase of engine cycle variation and the deterioration of HC and CO emissions; the mixture near the spark position The large-scale spatiotemporal changes of gas composition and charge movement put forward high requirements on the reliability of the ignition system, especially when the engine is working under lean limit conditions, the difficulty of ignition will lead to a sharp deterioration of the economy and HC and CO emissions; Lean burn also results in reduced flame propagation velocity and increased risk of knocking

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