Ignition plug for an internal combustion engine provided with an ionization current detector electrode
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsShigemi Murata, Masayuki Ikeuchi
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Abstract
An ignition plug for an internal combustion engine includes an ionization current detector electrode 20 adapted to be coupled to an external ionization detector circuit. Preferably, the ionization current detector electrode extends through a lateral through-hole formed vertically through an expanded portion of the electrical insulator 3. The lower end of the ionization current detector electrode may extend into the combustion chamber by a predetermined length. Further, the lower end of the ionization current detector electrode exposed to the fuel/air mixture within the combustion chamber may form a cylindrical grid to increase the contact area with the combustion gas.
Claims10
An ignition plug for an internal combustion engine, comprising:
- a housing;
- a cylindrical electrical insulator centrally extending through said housing;
- a central electrode coupled to and centrally extending through said electrical insulator, said central electrode having a first end exposed within a combustion chamber of the internal combustion engine and a second, opposite end adapted to be electrically connected to an ignition coil through a first dedicated connection line;
- a grounded electrode opposing the central electrode across a predetermined gap, to generate a spark therebetween to ignite a fuel/air mixture within the combustion chamber of the internal combustion engine;
- and
- an ionization current detector electrode coupled to said electrical insulator, and having a first end exposed to the fuel/air mixture within the combustion chamber and a second end adapted to be connected to an ionization current detector circuit through a second dedicated connection line, said second dedicated connection line being separate and distinct from said first dedicated connection line to prevent noise generated at ignition from affecting detection of ionization current by said ionization current detector circuit.
Dependencies are inferred from the claim text.