Internal combustion engine with dual ignition for a lean burn
AssigneeChrysler Corporation
InventorJose F. Regueiro
Life of this patent
Estimating the term…
Abstract
An internal combustion engine (10) with dual ignition has two spark plugs (70) and (72) mounted in a cylinder head (16) that forms a combustion chamber (44) in conjunction with the cylinder (14) and piston (18). The spark plugs sequentially ignite the lean air-fuel mixture in the combustion chamber towards the end of the compression stroke. The piston (18) has a recess (80) of variable width and depth that has its narrow portion in proximity to the spark plug (70) and wider and deeper portion aligned under spark plug (72). The ignition by spark plug (72) is delayed with respect to the ignition by spark plug (70).
Claims24
In an internal combustion engine having a cylinder and a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, two intake ports extending through said cylinder head and two intake valves mounted in said cylinder head for allowing fuel-air mixture to be admitted into said combustion chamber, at least one exhaust port extending through said cylinder head and an exhaust valve mounted to said cylinder head for allowing exhaust gases to exit said combustion chamber, the improvement characterized by:
- a first igniter mounted in said cylinder head between said two intake valves;
- a second igniter mounted in said cylinder head closer to a central longitudinal axis of said cylinder than said first igniter;
- means for actuating said first and second igniters in sequence with said first igniter being ignited before said second igniter.
In an internal combustion engine having a cylinder and a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, at least one intake port extending through said cylinder head and at least one intake valve mounted in said cylinder head for allowing fuel air mixture to be admitted into said combustion chamber, at least one exhaust port extending through said cylinder head and an exhaust valve mounted to said cylinder head for allowing exhaust gases to exit said combustion chamber, the improvement characterized by:
- a first igniter and a second igniter in said cylinder head substantially vertically aligned above said piston, said second igniter positioned closer to a central longitudinal axis of said cylinder than said first igniter;
- means for actuating said first and second igniters in sequence with said first igniter being ignited before said second igniter.
In an internal combustion engine having a cylinder and a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, at least one intake port extending through said cylinder head and at least one intake valve mounted in said cylinder head for allowing a fuel/air mixture to be admitted into said combustion chamber, at least one exhaust port extending through said cylinder head and an exhaust valve mounted to said cylinder head for allowing exhaust gases to exit said combustion chamber, the improvement characterized by:
- an igniter device for sequentially igniting said fuel/ air mixture in said combustion chamber at two different times with an initial ignition and a second ignition;
- said piston having a concave recess with a variable width, said recess having a periphery being tapered with a narrow end and a wide section.
A piston for an internal combustion engine, said piston characterized by;
- said piston having a concave recess with a variable width, said recess having a periphery being tapered with a narrow end and a wide section having a rounded end such that said periphery resembles a tear drop.
Dependencies are inferred from the claim text.