Internal combustion engine

Abstract

Internal combustion engine 1 comprising at least one cylinder 2 and a piston 3 supported for repeated reciprocal movement in the cylinder 2 so as to define a combustion chamber 21 of an engine bore diameter A-A, the internal combustion engine 1 further comprising an ignition device 4 arranged in said cylinder 2 having an igniter portion 42 and an fuel injector 43 which are both arranged in a pre-chamber 41, wherein the pre-chamber 41 comprises a plurality of orifices 44 for providing fluid communication between said pre-chamber 41 and the combustion chamber 21, and wherein the plurality of orifices 44 are of an overall orifice area so that the ratio between the overall orifice area and the engine bore diameter A-A ranges from 0.01 mm to 0.2 mm.

Description

technical field [0001] The invention relates to an internal combustion engine according to the independent claims. Background technique [0002] The invention relates to the field of internal combustion engines utilizing spark ignition. Lean combustion with lambda in the range of approximately 1<λ<1.5 has been shown to increase net thermal efficiency compared to combustion with lower lambda, however it also increases NOx emissions, requiring a catalytic converter. Ultra-lean combustion with λ > 1.5 has demonstrated the ability to simultaneously increase net thermal efficiency and significantly reduce NOx emissions. The main limitation of ultra-lean-burn systems is the poor ignition properties of the mixture, which leads to a "lean limit" of lambda values ​​above which the internal combustion engine does not ignite. [0003] It is known in those internal combustion engines to deal with the low ignition properties of ultra-lean air-fuel mixtures by using turbulent j...

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