Spark compression ignition type piston, combustion system, power assembly system and control method

Abstract

The embodiment of the invention provides a spark compression ignition type piston, a combustion system, a power assembly system and a control method. The top structure of the piston is symmetrically arranged about the center line in the first direction and the second direction, and the first direction and the second direction are perpendicular to each other; the top structure of the piston comprises a center pit, vortex rings, air inlet pits and air exhaust pits; the central pit is formed in the middle of the piston; the two vortex rings are arranged on the two sides of the center pit in the first direction; the air inlet pits and the air exhaust pits are formed in the two sides of the center pit in the second direction; and the central pit, the air inlet pits and the air exhaust pits arein fluid connection with the same side edges of the vortex rings. By improving the structure of the surface of the piston, time-sharing and partitioning heat release of the combustion system is achieved, short-time constant-volume heat release of unburned mixed gas can be avoided, the pressure rise rate and rough combustion are inhibited, the combustion system can still achieve a high combustion isometric degree under the high load of an ignition compression ignition manner within the wide overall equivalence ratio range, and the thermal efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a spark compression ignition piston, a combustion system, a power assembly system and a control method. Background technique [0002] The internal combustion engine is a heat-power conversion power system with a large volume and wide range, especially in the field of vehicles. The development of its combustion system has always been the basis for achieving high thermal efficiency. Degree, reduce the proportion of post-combustion, and reduce the energy loss of heat transfer and exhaust process. At present, there are many developments for the combustion systems of traditional ignition gasoline engines and compression ignition diesel engines. The new combustion method combined with the compression ignition process is seldom specially optimized, but mostly based on the control strategy optimization of the combustion chamber of the traditional internal combustion engine. [0003] In...

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Problems solved by technology

For this reason, the present invention proposes a spark compression ignition type piston, which is used to solve the defects that the combustion system in the prior art cannot realize time-division and divisional combustion, rough combustion, and cannot withstand high loads. Through oil-gas matching and geometric structure guidance, Generate asymmetric flame propagation, and then realize the time-sharing zone of self-ignition, suppress rough combustion, and can maintain a better combustion phase in a higher intake pressure and a leaner environment, so as to take into account the load and thermal efficiency improvement

[0005] The present invention also proposes a combustion system to solve the defects of the combustion system in the prior art that it cannot realize time-sharing and zoned combustion, the combustion is rough, and it cannot withstand high loads. By setting the positional relationship between the injector, spark plug and swirl ring , to achieve the difference in flame propagation speed in different directions in the combustion chamber, and realize the time-sharing partition of flame propagation and spontaneous combustion

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