Patent ID: 11891973
Assignee: MAZDA MOTOR CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. An engine system, comprising:
a cylinder block and a cylinder head that form a cylinder;
a piston reciprocatably accommodated in the cylinder;
a main combustion chamber defined by the cylinder block, the cylinder head, and the piston;
a subchamber that is separated from the main combustion chamber by a partition, and communicates with the main combustion chamber through a communicating hole formed in the partition;
an injector that injects fuel into the main combustion chamber;
a main spark plug that performs main ignition for igniting a mixture gas inside the main combustion chamber;
a subspark plug that performs subignition for the igniting mixture gas inside the subchamber; and
a controller that is electrically connected to, and outputs an electric signal for control to, the injector, the main spark plug, and the subspark plug,
wherein when an engine is operated in a high-speed range where an engine speed is above a given reference engine speed, the controller is configured to:
in a low-load range where an engine load is below a given reference load, control the main spark plug and the subspark plug so that the subignition is performed after the main ignition; and
in a high-load range where the engine load exceeds the reference load, control the main spark plug and the subspark plug so that the main ignition is performed after the subignition.