EP 0989646 A1 20000329 - Spark Plug and ignition system for use with internal combustion engine
Title (en)
Spark Plug and ignition system for use with internal combustion engine
Title (de)
Zündkerze und Zündanordnung zur Anwendung in einem Verbrennungsmotor
Title (fr)
Bougie d'allumage et système d'allumage pour utilisation dans un moteur à combustion interne
Publication
Application
Priority
- EP 99307498 A 19990922
- EP 99306552 A 19990819
- JP 26825598 A 19980922
Abstract (en)
A spark plug (100) includes a spark portion (31, 32) of an Ir-based metal and a resistor (15) disposed between a center electrode (3) and a metallic terminal (13) and adapted to establish an electric resistance of not less than 10 k OMEGA , preferably not less than 15 k OMEGA , as measured between the center electrode (3) and the metallic terminal (13). Thus, even in a system in which an ignition coil (51) is connected directly to the spark plug (100) without use of a high tension cable, an electrical discharge with a relatively weak current, such as a glow discharge, can be maintained stably, so that even at high-speed or heavy-load operation, consumption of the spark portion (31, 32) caused by volatilization of Ir through oxidation can be suppressed, thereby extending spark plug life. <IMAGE>
IPC 1-7
IPC 8 full level
H01T 13/39 (2006.01); H01T 13/41 (2006.01)
CPC (source: EP)
H01T 13/39 (2013.01); H01T 13/41 (2013.01); F02B 2275/18 (2013.01)
Citation (search report)
- [DA] US 5514929 A 19960507 - KAWAMURA KAZUMI [JP]
- [A] EP 0805534 A1 19971105 - NGK SPARK PLUG CO [JP]
- [A] US 3923698 A 19751202 - KAMIGAITO OSAMI, et al
- [A] PATENT ABSTRACTS OF JAPAN vol. 012, no. 281 (E - 641) 2 August 1988 (1988-08-02)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 99307498 A 19990922