Patent ID: 11939905
Assignee: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 21:
22. An engine apparatus comprising:
(a) a pre-chamber including a pre-combustion cavity and multiple combustion exit apertures, at least a first of the exit apertures having a different main combustion chamber-facing port diameter as compared to another of the exit apertures;
(b) an ignitor having a distal end in or directly accessible to the pre-combustion cavity;
(c) a pre-chamber air inlet valve having a portion located in or adjacent to the pre-combustion cavity;
(d) a main piston cylinder including a main combustion chamber;
(e) a fuel injector located external to the pre-combustion cavity, the fuel injector including an injection tip located in the main combustion chamber, and the fuel injector being spaced away from the pre-chamber;
(f) the fuel injector operably emitting a first amount of fuel into the main combustion chamber which is pushed into the at least one aperture for subsequent pre-combustion by the ignitor within the pre-chamber cavity, the fuel injector being the sole source of the fuel into the pre-chamber cavity;
(g) the same fuel injector operably emitting at least a second amount of the fuel into the main combustion chamber which is less than the first amount of the fuel for combustion in the main combustion chamber and at least the second amount of the fuel being ignited by the pre-combustion occurring in the pre-chamber cavity;
(h) the pre-chamber comprising a concave-curved cup being coaxial with the longitudinal axis of the piston; and
(i) a fresh air conduit externally connected to a top surface of a cartridge which includes the prechamber and the ignitor, and a heater positioned adjacent the air conduit.