Internal combustion engine with direct fuel injection
AssigneeDaimler AG
InventorDietmar Bertsch
Life of this patent
Estimating the term…
Abstract
In an internal combustion engine with at least one cylinder in which a combustion space is delimited between a piston and a cylinder head, with a fuel injector having an outwardly opening injection nozzle arranged in the combustion space for injecting fuel in the form of a hollow cone into the combustion space, and a spark plug mounted in the cylinder head and having electrodes arranged outside the hollow fuel cone generated by the injection nozzle, into which the electrodes of the spark plug project, the cylinder has a bore diameter (D) dimensioned such that, at an ignition time point of the internal combustion engine, a ratio dmR/D of the mean diameter (dmR) of the fuel boundary vortex (10) to the cylinder bore diameter (D) is in a range of 0.08 to 0.2, in particular of 0.1 to 0.12.
Claims12
An internal combustion engine (1), comprising
- at least one cylinder (2) including a piston (3) and a cylinder head (5), defining therebetween a combustion space (4),
- a spark plug (7) arranged in the cylinder bead so as to extend into the combustion space (4),
- an outwardly opening injection nozzle (11) arranged in the cylinder head (5) and having nozzle opening projecting into the combustion space (4) for the injection of a fuel jet in the form of a hollow cone (8) into the combustion space (4),
- the spark plug (7) being arranged outside the surface area (9) of the hollow fuel cone (8) generated by the injection nozzle, and having electrodes (12) projecting into a fuel boundary vortex (10), formed at the surface area (9) of the injected fuel jet,
- said cylinder (2) having a cylinder bore (2a) with a diameter (D) dimensioned such that
- at an ignition time point of the internal combustion engine (1) a ratio (dmR/D) of a mean diameter (dmR) of the fuel boundary vortex (10) to the bore diameter (D) is in a range of 0.08 to 0.2.
Dependencies are inferred from the claim text.