Internal combustion engine homogeneous pressure combustion system capable of directly controlling igniting time

Abstract

The system includes gas distribution system, fuel injection system, combustion chamber, ignition system and electric control unit. A super high-energy spark plug containing impulsive discharge energy more than 1 joule is in use for the ignition system. High-energy discharge power source is setup between the spark plug and the electric control unit, which through the discharge power source controls discharging time and energy of spark plug. Comparing prior art, the invention controls burning time of gas mixture inside cylinder directly so as to raise control precision greatly. Reserving features of lean combustion and conflagration of CAI combustion system, the invention realizes burning procedure in energy saving and low discharge.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and more specifically relates to a homogeneous compression ignition combustion technology of an internal combustion engine whose ignition time can be directly controlled. technical background [0002] The combustion process of a conventional gasoline engine belongs to the flame propagation combustion process of a homogeneous mixture ignited by a spark plug. Since the concentration of the mixture gas that maintains the flame propagation has a lean burn limit (the excess air coefficient is less than 1.3), when the mixture gas is too lean, it will cause poor combustion. Stable or even lost fire, so when the load is small, it is necessary to rely on the throttle to reduce the intake air volume. The throttling loss in the intake process is one of the main reasons why the efficiency of gasoline engines is lower than that of diesel engines. For this re...

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Problems solved by technology

However, while the compression auto-ignition combustion process overcomes the shortcomings of the traditional gasoline engine, it also loses the advantages of the traditional gasoline engine—the ignition process can be directly controlled by the spark plug, and the ignition time of the CAI combustion process can only rely on some indirect control measures, such as: intake air Heating temperature control and internal exhaust gas circulation rate control. Although the CAI engine is also equipped with spark plugs, the ordinary spark plug ignition device is not enough to control the ignition moment of the lean mixture. Therefore, the control accuracy and flexibility of the CAI engine ignition time are relatively poor. These shortcomings hinder the further improvement of the thermal efficiency of the CAI combustion process, and also cause the defect of a narrow application range of the CAI combustion process. Therefore, so far, The CAI combustion process is not yet available for real engines

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