US 11,815,008 B1
Ignition system for internal combustion engine
Akimitsu Sugiura, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Dec. 15, 2022, as Appl. No. 18/082,082.
Application 18/082,082 is a continuation of application No. PCT/JP2021/020848, filed on Jun. 1, 2021.
Claims priority of application No. 2020-106707 (JP), filed on Jun. 22, 2020.
Int. Cl. F02B 19/12 (2006.01); H01T 13/54 (2006.01); H01T 13/20 (2006.01)
CPC F02B 19/12 (2013.01) [H01T 13/20 (2013.01); H01T 13/54 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An ignition system for an internal combustion engine comprising:
a spark plug including a prechamber in which a spark gap is located; and
a plug cover covering the prechamber and including an ejection hole, which connects the prechamber to a main combustion chamber of the internal combustion engine, wherein
the ignition system is configured to apply a pre-discharge voltage that causes a pre-discharge across the spark gap during an intake stroke of the internal combustion engine; and
the internal combustion engine is configured to directly inject fuel into the main combustion chamber and to apply a pre-discharge voltage across the spark gap at a point in time before injecting the fuel.