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Composite gas inlet path of modifying gasoline ignition engine based on diesel engine

A technology for air intakes and diesel engines, applied to combustion engines, machines/engines, internal combustion piston engines, etc., can solve problems such as increased knocking tendency, reduced flame propagation speed, and limited flame radial propagation, etc., to increase explosion pressure, Improves the speed of flame propagation and promotes the formation of fire cores

Pending Publication Date: 2019-04-16
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most existing diesel engine platforms use flat-bottomed cylinder heads, spiral intake ports, and ω-shaped combustion chambers. The flow in the cylinders is dominated by eddy currents. During ignition and combustion, the orderly vortex flow field will limit the radial spread of the flame, thereby reducing the flame propagation speed and increasing the tendency of knocking

Method used

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  • Composite gas inlet path of modifying gasoline ignition engine based on diesel engine
  • Composite gas inlet path of modifying gasoline ignition engine based on diesel engine
  • Composite gas inlet path of modifying gasoline ignition engine based on diesel engine

Examples

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Embodiment 1

[0033] In this embodiment, the engine cylinder diameter D is 90 mm, the compression ratio is 12, and the cylinder head is a four-valve structure. like figure 1 As shown, the composite intake port of the engine is composed of a spiral intake port 1 and a tangential intake port 2 . The spiral inlet 1 is composed of a straight-line section 4 connected in sequence, a spiral section 5 spiraling downward and an outlet 6-1 of the spiral inlet. The spiral section 5 is located above the cylinder head 8 of the cylinder. The inlet end of the straight-line section 4 is the inlet 3-1 of the spiral air inlet. The outlet of the spiral inlet port 6-1 is arranged on the cylinder head 8 and communicates with the cylinder. The bottom surface of the cylinder head 8 is a plane arranged in the horizontal direction, and a spark plug 9 is installed at the center of the cylinder head 8 . The top of the helical section 5 is provided with a first circular hole 7-1 for fixing and guiding the valve ste...

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Abstract

The invention discloses a composite gas inlet path of modifying a gasoline ignition engine based on a diesel engine. On the basis of keeping a flat-bottom cylinder bottom of the original diesel engine, the spiral and tangential composite gas inlet path is adopted to improve longitudinal tumble intensity in a cylinder, so that inclined swirl is formed in the cylinder. The composite gas inlet path can promote radial propagation of flame while improving turbulence intensity in the cylinder, and increases flame propagation speed, so that the engine is guaranteed to still have relative good dynamicproperty and economical efficiency after gasoline fuels are modified, and therefore, performances and emission requirements of a medium-heavy commercial vehicle engine are met while a post-treatmentsystem is greatly simplified in a mode that the engine is matched with a three-way catalyst.

Description

technical field [0001] The invention relates to the structural design optimization of an engine intake port, in particular to a compound intake port for a gasoline ignition engine based on a diesel engine. Background technique [0002] With the continuous upgrading of emission regulations, diesel engines rely more and more on after-treatment, and the complexity and cost of after-treatment device integration have also increased significantly. By using gasoline fuel equivalent premixed combustion on the basis of the original diesel engine, the ultra-low emission requirements can be met only through the three-way catalytic converter, which greatly simplifies the after-treatment system and reduces the overall use and calibration costs of the engine; on the other hand, the diesel engine The engine body has higher strength and can withstand higher explosion pressure than traditional gasoline engines. Therefore, after switching to gasoline fuel, combined with advanced combustion te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M35/10F02B69/02
CPCF02B69/02F02M35/10078F02M35/10118Y02T10/12
Inventor 尧命发赵旭敏王浒王燕郑尊清
Owner TIANJIN UNIV
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