Title:
IGNITION PLUG FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JPS60157182
Kind Code:
A
Abstract:
A spark plug which has a capacitor located therein, connected in parallel to the main or ignition spark gap (13), additional includes a pilot or pre-spark gap (12) located within the insulator (18) of the spark gap, to control discharge of the capacitor (14) through the main spark gap (13). In accordance with the invention, the pre-spark gap (12) is located within a chamber (34) in the insulator which is filled with a pressurized gas, preferably nitrogen under pressure of between 2 to 100 bar, preferably 5 to 30 bar, with the electrodes (27, 27) defining the pre-spark gap being spaced, preferably, between about 0.1 to 1 mm from each other. Placing the pre-spark gap electrodes within a pressurized gas chamber increases the energy available at the main spark gap (13) for ignition even of very lean fuel-air mixtures. Preferably, an inductive-resistive circuit (15) is connected in shunt across the main electrode (13) to prevent arcing and glow discharges across the main spark gap (13) after the initial ignition spark.
Inventors:
BUERUNAA HERUDEN
BUERUNAA BUROSU
BUERUNAA BUROSU
Application Number:
JP26761284A
Publication Date:
August 17, 1985
Filing Date:
December 20, 1984
Export Citation:
Assignee:
BOSCH GMBH ROBERT
International Classes:
F02P3/08; H01T13/22; F02P9/00; F02P13/00; H01T13/46; F02B1/04; (IPC1-7): H01T13/22
Attorney, Agent or Firm:
Toshio Yano