Spark compression ignition type piston, combustion system, powertrain system and control method

Abstract

Embodiments of the present invention provide a spark compression ignition piston, a combustion system, a powertrain system and a control method. The top structure of the piston is arranged symmetrically with respect to the center line along the first direction and the second direction, and the first direction and the The second direction is perpendicular to each other; the top structure of the piston includes: a central pit, a swirl ring, an intake pit and an exhaust pit; the central pit is arranged in the middle of the piston; two swirl rings are arranged on both sides of the central pit along the first direction; The air intake pit and the exhaust pit are arranged on both sides of the central pit along the second direction; wherein, the central pit, the air intake pit and the exhaust pit are in fluid connection with the same side of the swirl ring. By improving the structure of the piston surface, the present invention realizes the time-divided and zoned heat release of the combustion system, can avoid the heat release of the unburned mixture gas at a constant volume in a short time, suppresses the pressure rise rate and rough combustion, and realizes a wide overall equivalent ratio range. , the combustion system can still achieve a high combustion constant volume under the high load of the ignition and compression ignition mode, and improve the thermal efficiency.

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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