公开(公告)号：US20190078498A1

公开(公告)日：2019-03-14

申请号：US16122175

申请日：2018-09-05

Applicant: FCA Italy S.p.A.

Inventor： Fabio BEDOGNI ,  Stefano MAGISTRALI ,  Davide MAZZONI ,  Ettore MUSU ,  Gianluca PIVETTI ,  Paolo ZOLESI

IPC: F02B19/10

Abstract: An engine has, for each cylinder, a combustion chamber and a combustion pre-chamber communicating with the combustion chamber. First and second spark plugs are associated with the pre-chamber and combustion chamber, respectively. Gasoline is injected by an injector device directly into the combustion chamber and/or by an injector device into a cylinder intake duct. There is no device for injecting gasoline, air or an air/gasoline mixture directly into the pre-chamber. The engine operates with an air/gasoline mixture substantially corresponding to stoichiometric for compatibility with an exhaust system having a trivalent catalyst. The pre-chamber is, not used for engine operation with poor dosing, but to increase resistance to engine detonation. The engine can thus be configured with a high compression ratio, with a significant reduction in fuel consumption at the same power level. The second spark plug is only activated at low and medium engine loads to stabilize combustion.