Full behavior air/fuel ratio control method of double mode directly jetting gasoline engine

A control method and technology of air-fuel ratio, applied in engine control, fuel injection control, electrical control and other directions, can solve rare problems, achieve the effect of avoiding interference, simplifying control strategy, avoiding knocking and misfire

Inactive Publication Date: 2007-12-05
TSINGHUA UNIV
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  • Full behavior air/fuel ratio control method of double mode directly jetting gasoline engine

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Embodiment

[0033] On a two-valve engine with a cylinder diameter of 95 mm, a compression ratio of 13, and a cone angle of 30°, the two-valve engine of the high-pressure swirl parachute gasoline electronic control injector has carried out normal operation in both modes and successfully switch between the two modes.

[0034] Experiments have proved that by adopting different air-fuel ratio strategies in different combustion modes, the respective advantages can be effectively brought into play. The theoretical air-fuel ratio is adopted in the ignition mode, and the three-way catalytic converter can be effectively used to reduce emissions, while the NOx emission in the compression ignition mode is very low, and the three-way catalytic converter can also be used to reduce HC and CO emissions, so that the after-treatment of the whole machine Device cost is effectively controlled. During the switching process, although there is a lean burn state in the ignition mode, because the time is very s...

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Abstract

A method to control the full-behavior air-fuel ratio of the bimodal bursting petrol motor adopts different air-fuel ratio under the different combustion modes to control combustion: under the firing mode, the triple effect catalytic converter uses the theoretical air-fuel ratio to reduce the emission. Under the compression-ignition mode, use the lean-burn with the throttle fully opening to improve the fuel economy. In the transition zone of the two combustion modes, the throttle jaw opening is kept and the air-fuel ratio of the firing mode is little higher than the theoretical value. The laminar lean-burn is realized matching the injection strategies. The gas mixture under the compression-ignition mode is stronger than that under the firing mode with the same throttle jaw opening. The air-fuel ratio is closes to the theoretical value. This method can combine the advantages of the two combustion modes, avoid defects and realize stable combustion in the full-behavior range. Especially during the mode transmitting process, it can simplify the control strategies, improve the smoothness and avoid the abnormal combustion phenomenon of knocking and losing fire during this process.

Description

technical field [0001] The invention relates to a method for controlling the air-fuel ratio of a direct-injection gasoline engine under two modes of homogeneous compression ignition and spark ignition, in particular to the air-fuel ratio in the homogeneous compression ignition area, the spark ignition area, and the switching area of ​​the two combustion modes. The invention relates to a fuel ratio control strategy, which belongs to the technical fields of automobile engine and internal combustion engine combustion. Background technique [0002] The homogeneous mixture compression ignition (HCCI) combustion method can significantly improve the combustion thermal efficiency of gasoline engines, reaching the level of ordinary diesel engines, and at the same time reduce NOx emissions by more than 95% compared with ordinary gasoline engines. It is currently a research hotspot in the world. However, the load range of this combustion method is small. Although it can meet the requir...

Claims

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Application Information

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IPC IPC(8): F02D41/00
CPCY02T10/128Y02T10/12
Inventor 田国弘王志王建昕帅石金
Owner TSINGHUA UNIV
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