Direct injection compression ignition engine and cold start method thereof

An engine, cold start technology, applied in the direction of engine starting, engine components, machines/engines, etc., can solve the problems of poor gasoline self-ignition and not suitable for gasoline direct injection compression ignition engines.
CN104500301AInactive Publication Date: 2015-04-08TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2015-04-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of engines, in particular to a direct injection compression ignition engine and a cold start method thereof. The engine comprises an oil spraying nozzle and a combustion chamber, wherein the oil spraying nozzle is formed in the upper part of the combustion chamber; and multiple oil spraying holes are formed in the peripheral direction of the oil spraying nozzle. The engine further comprises a glow plug; and the glow plug is arranged at the upper part of the combustion chamber, and is positioned between the spraying directions of the two oil spraying holes. When the spraying of the oil spraying nozzle is finished, the concentration of mixed gas is close to a theoretical air-fuel ratio; along with the spraying motion and the flowing of gas in a cylinder, an area of the mixed gas with equivalence ratio concentration appears around the top end of the glow plug; in the first circulation of cold start of the engine, the glow plug heats the surrounding mixed gas to rise up the gas temperature to realize the ignition; and meanwhile, as an oil spraying pocket is not contacted with the glow plug, the carbon smoke discharge caused by oil film combustion due to wall collision in high load is prevented.
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Description

technical field

[0001] The invention relates to the field of engines, and in particular provides a direct injection compression ignition engine and a cold start method thereof. Background technique

[0002] Gasoline direct injection compression ignition engine is a new type of internal combustion engine, which uses gasoline compression ignition. Compared with traditional diesel combustion, gasoline compression ignition mode benefits from the longer ignition delay period of gasoline fuel, which can fully mix the oil and gas before ignition , not only to achieve high thermal efficiency, but also to significantly reduce NO x and soot emissions. Although this mode can operate relatively stably at medium and high loads, the combustion stability at low loads is poor, especially cold start is a major technical bottleneck for the industrialization of gasoline direct injection compression ignition engines. When there is no cold start aid, gasoline is difficult to ignite due to the ...

Claims

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