Premixed combustion system of diesel engine

A pre-mixed combustion and diesel engine technology, applied to combustion engines, mechanical equipment, machines/engines, etc., to achieve the effects of soft work, lower maximum pressure in the cylinder, and full combustion

Inactive Publication Date: 2007-12-12
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

Since no effective method has been found, at present, premixed combustion can only be partially realized at low loads, and diffusion combustion is still used at higher loads.

Method used

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  • Premixed combustion system of diesel engine

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Embodiment Construction

[0011] In the embodiment shown in Figures 1 and 2: the diesel engine adopting premixed combustion in Figure 1 has no obvious difference in structure from the ordinary diesel engine. For example, the piston 1, connecting rod 2 and crankshaft 4 are the main moving parts, and the fixed parts And the major systems have not changed much, but a spark plug 6 is added to the cylinder head, and the intake cam 3 has also become relatively fat. The expansion ratio has been increased from the original 17 to 22. Figure 2 is the fuel supply, ignition and gas distribution phase diagram of the diesel engine shown in Figure 1. Obviously, the diesel engine with premixed combustion has obvious characteristics: the intake delay angle β is 80 degrees crank angle; the geometric fuel supply advance angle θ is 90 degree crank angle; spark plug ignition angle φ is 1 degree crank angle before top dead center. The intake advance angle α, exhaust advance angle γ and exhaust delay angle δ are the same as thos...

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Abstract

A diesel engine pre-mixing burning system has larger lagging angle of air feeding and geometric advancing angle of oil feeding, it has remarkably decreased compression ratio, loss of pumping air and the temperature of air compressed, prolonged combustion lagging period so that the burning point is controlled near the newtonian focus of compression stroke, in addition to the spark plug being lightened, the diesel engine is ensured to lighted in low compression ratio ; besides, the high expansion ratio has made full use of competence of apply work of air cylinder combustion gas. The pre-mixing method makes burning more complete and perfect, has high energy utilization ratio, decreases the highest pressure as well as highest temperature, plongs its service life and realizes the goal of highly effective cleaning of diesel engine burning.

Description

Technical field [0001] The invention relates to a diesel engine premixed combustion system, which belongs to the field of internal combustion engine structure and combustion. Background technique [0002] As we all know, traditional diesel engine combustion belongs to heterogeneous mixed diffusion combustion. The inherent nature of this combustion method determines that there must be two contradictions between economy and emissions, soot emissions and NOx emissions. For this reason, internal combustion engine workers have been trying to find a new efficient and clean combustion method that can solve the above-mentioned contradictions. In the early 1980s, from the perspective of improving diesel engine combustion and emissions, a diesel engine thermal premixed combustion method was formally proposed: before compression and ignition, all fuel is injected into the cylinder to quickly form a homogeneous lean mixture, and the ignition point is controlled. Near the top dead center, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B23/02
CPCY02T10/125Y02T10/12
Inventor 隆武强冯立岩冷先银陈雷付磊
Owner DALIAN UNIV OF TECH
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