Spark plug auxiliary gasoline compression ignition combustion chamber

Abstract

The invention discloses a spark plug auxiliary gasoline compression ignition combustion chamber. The mainly comprises a cylinder cover lower wall face, an intake valve, an exhaust valve, an oil sprayer mounting hole, a spark plug mounting hole, a cylinder wall, a spark plug, a piston and the like; on the basis of a combustion chamber of a heavy-duty diesel engine, one or two spark plug mounting holes are additionally formed between an intake valve and an exhaust valve of a diesel engine cylinder cover and at a proper distance from a fuel injector; the concentration layering of the mixed gas inthe cylinder is controlled by optimizing a piston molded line and combining an oil injection strategy. Combustion is controlled through spark plug auxiliary ignition, and stable combustion of gasoline fuel under the low-load working condition lean combustion condition (the global excess air coefficient (lambda) is larger than 1) can be achieved; and the gasoline compression ignition low-load stable operation boundary can be expanded to the idling level by combining the throttle valve. Compared with the prior art, the diameter of the piston pit of the combustion chamber is large, oil beam wallcollision can be reduced under the large-load working condition, and soot generated in a cylinder is reduced.

Description

technical field [0001] The invention relates to a reciprocating piston engine, in particular to a gasoline compression ignition combustion chamber structure. Background technique [0002] Gasoline compression ignition is a clean and efficient engine combustion technology. The gasoline compression ignition combustion mode based on the diesel engine platform not only inherits the high thermal efficiency of the diesel engine, but also inherits the advantages of good gasoline-fuel mixture uniformity. The harmful emissions such as soot and NOx under the same load are much lower than that of the traditional diesel engine. Compared with diesel, gasoline has low reactivity, and the combustion stability of gasoline compression ignition under small load is one of the key technical bottlenecks restricting the application of gasoline compression ignition technology. Spark plug-assisted gasoline compression ignition is a potential technical means to expand the combustion stability of sm...

AI Technical Summary

Problems solved by technology

Prior art such as CN207018102U is that the diameter of the piston top is 70-90mm, and this geometric dimension is smaller than the bore of the existing vehicle heavy-duty diesel engine

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