Piston for ignition 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 achieve high-efficiency combustion thermal efficiency performance of ignition compression ignition, and inability to meet the requirements of gasoline ignition compression ignition, etc., and achieve the effect of improving thermal efficiency.
Active Publication Date: 2022-01-25
DONGFENG MOTOR CORP HUBEI
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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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[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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The invention relates to a piston for igniting a compression ignition gasoline engine, comprising a piston body, characterized in that a pit, a first and a second intake avoidance pit, a first and a second exhaust avoidance pit, and a pit are arranged in the center of the top surface of the piston body Including the side wall and the bottom of the pit, the bottom of the pit is aligned with the injection direction of the injector oil beam, the first and second intake avoidance pits, the first and second exhaust avoidance pits are arranged in sequence along the circumference of the pit, the first intake avoidance pit Between the gas avoidance pit and the second intake avoidance pit and between the first exhaust avoidance pit and the second exhaust avoidance pit respectively form a first top surface; between the first intake avoidance pit and the second exhaust avoidance pit A second top surface is formed between the first exhaust avoidance pit and the second intake avoidance pit, and the level of the second top surface is not lower than the level of the first top surface. With the present invention, the rich mixture gas is formed in the pit and is easy to ignite to generate a fire nucleus, and then the fire nucleus is quickly guided to the area outside the pit to ignite the lean mixture gas, thereby effectively improving the thermal efficiency of the engine.
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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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