Patent ID: 6675785
Filing Date: 2004-01-13
Classification: G01L,H01T

Abstract:
An ignition device for an internal combustion engine, comprising a spark plug having a center electrode accommodated in a cylindrical insulator for generating a spark discharge in a combustion chamber of an internal combustion engine, an ignition coil having a primary winding and a secondary winding for supplying high voltage to said spark plug, and a pressure sensing element for detecting a pressure of said combustion chamber, whereinsaid spark plug, said ignition coil, and said pressure sensing element are accommodated in a cylindrical casing and installed in a cylinder head of said internal combustion engine, said insulator comprises a plug side cylindrical portion having an inner space for accommodating said center electrode and a coil side cylindrical portion extending from said plug side cylindrical portion in a direction departing from said combustion chamber, said coil side cylindrical portion has one end protruding in said direction departing from said combustion chamber with respect to said primary winding and said secondary winding, and said pressure sensing element is disposed next to said one end of said coil side cylindrical portion.