| 摘要 |
In the field of manufacturing automobiles using internal combustion engines, an effort has been made to develop a low-pollution engine meeting the Muskie law in U.S.A., by reducing the concentration of noxious substances, such as nitrogen oxide including nitrogen dioxide and carbon monoxide in an exhaust gas of an engine. The ignition plug for double ignition systems according to the present invention was invented for removing these noxious substances from an exhaust gas of an engine. In this ignition plug, a sealed cavity is formed in an outer insulator thereof, and brass electric arc rods are provided as parts of a feeder circuit in this cavity so that the arc rods are opposed to each other with a clearance of around 10 mm therebetween. Spark discharge is generated once in this clearance, as well as large powerful electric sparks on an ignition port element simultaneously. A method of simultaneously generating spark discharge in two places, i.e. the inner side and outer side of a cylinder of an engine having one ignition plug, which is a so-called double ignition system. When spark discharge is once generated in this manner in a cavity in an outer insulator of an ignition plug, a lot of electric charge is collected in a conductor extending from the cavity to an ignition port element, sharp, large electric sparks short in discharge time are generated owing to an increased electric current. A combustion gas is burnt nearly completely with such large powerful electric sparks, whereby the concentration of the above-mentioned noxious substances in an exhaust gas is reduced greatly. This enables the concentration of noxious substances to decrease by not less than 60 %, and an engine output to be improved by around 25 % owing to an increase in the combustion rate. This ignition plug for double ignition systems is utilized in the industrial field of internal combustion engines. |
