Ignition system for spark plugs capable of removing carbon deposits

摘要

An ignition system for creeping discharge spark plugs for producing a spark discharge at least one portion of which slidably moves along a creeping discharge path is disclosed. The system comprises producing a spark discharge operative to ignite a mixed gas in an usual manner and selectively producing a purifying and sweeping spark discharge operative to remove carbon deposited on said creeping discharge path. An ignition circuit for carrying out the system is also disclosed.