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Piston for ignition and compression ignition gasoline engine

A gasoline engine and piston technology, which is applied in the field of ultra-lean combustion, can solve the problems of severely limited compression ratio, inability to meet the requirements of gasoline ignition and compression ignition, and inability to achieve high-efficiency combustion thermal efficiency performance of ignition compression ignition, and achieve the effect of improving thermal efficiency.

Active Publication Date: 2021-03-16
DONGFENG MOTOR CORP HUBEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of structure adopts the large central pit, the compression ratio is severely limited, and it cannot meet the requirements of gasoline ignition and compression ignition, and further cannot realize the high combustion thermal efficiency performance of ignition and compression ignition

Method used

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  • Piston for ignition and compression ignition gasoline engine
  • Piston for ignition and compression ignition gasoline engine
  • Piston for ignition and compression ignition gasoline engine

Examples

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and examples, but these examples should not be construed as limiting the present invention.

[0035] A piston for ignition compression ignition gasoline engine, comprising a piston body 1, a pit 2, a first intake avoidance pit 3.1, a second intake intake avoidance pit 3.2, and a first exhaust escape pit 4.1 are arranged on the top surface of the piston body 1 and the second exhaust avoidance pit 4.2. The pit 2 is located at the center of the top surface of the piston body 1. The pit 2 includes a side wall 2.1 and a pit bottom 2.2. The pit bottom 2.2 is aligned with the injection direction of the injector oil beam. The avoidance pit 3.1, the second intake avoidance pit 3.2, the first exhaust avoidance pit 4.1 and the second exhaust avoidance pit 4.2 are arranged in sequence along the circumference of the pit 2, the first intake avoidance pit 3.1 and the second intake avoida...

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Abstract

The invention relates to a piston for an ignition and compression ignition gasoline engine. The piston comprises a piston body and is characterized in that a pit, a first air inlet avoiding pit, a second air inlet avoiding pit, a first exhaust avoiding pit and a second exhaust avoiding pit are formed in the center of the top face of the piston body; the pit comprises a side wall and a pit bottom,and the pit bottom is aligned with the oil beam spraying direction of an oil sprayer; the first air inlet avoiding pit, the second air inlet avoiding pit, the first exhaust avoiding pit and the secondexhaust avoiding pit are sequentially arranged in the circumferential direction of the pit, and first top faces are formed between the first air inlet avoiding pit and the second air inlet avoiding pit and between the first exhaust avoiding pit and the second exhaust avoiding pit correspondingly; and second top faces are formed between the first air inlet avoiding pit and the second exhaust avoiding pit and between the first exhaust avoiding pit and the second air inlet avoiding pit correspondingly, and the horizontal height of the second top faces is not smaller than that of the first top faces. Through the adoption of the piston, thick mixed gas is formed in the pit and is easily ignited to generate a fire core, then the fire core is rapidly guided to the area outside the pit to enablelean mixed gas to be subjected to combustion ignition, and the heat efficiency of an engine is effectively improved.

Description

technical field [0001] The invention relates to ultra-lean combustion of ignition compression ignition, in particular to a piston for ignition compression ignition gasoline engine. Background technique [0002] Based on the requirements of energy saving and emission reduction, gasoline engines often use compression ignition technology to further improve their thermal efficiency, that is, ignite a part of the working fluid through the spark plug, form a fire core to heat the rest of the working fluid, and form the pressure required for compression ignition in the cylinder, thereby Compression ignites the remaining working fluids to achieve high compression ratio and ultra-lean combustion of gasoline. [0003] CN101338693A discloses a device and method for expanding the load range of compression-ignition gasoline. A central pit is set at the center of the top surface of the piston, and fuel is injected twice in the cylinder. The first fuel injection is performed in the intake ...

Claims

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Application Information

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IPC IPC(8): F02F3/28F02F3/24
CPCF02F3/28F02F3/24
Inventor 王文建桂强蔡文新史来锋王静秋
Owner DONGFENG MOTOR CORP HUBEI
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