A high-pressure oil rail with a pressure stabilizing device

Abstract

The invention belongs to the field of fuel injection systems of diesel engines, discloses a high pressure oil rail with a pressure stabilizing device, and aims at reducing pressure fluctuation in the fuel oil supply process, automatically adjusting the pressure of the high pressure oil rail, achieving stable oil supply of the high pressure oil rail and ensuring operation smoothness of an engine. The high pressure oil rail mainly comprises a high pressure oil rail body, an auxiliary oil rail, a sealing cover, a hole channel, an oil storage compartment, a rigid ball, a gas storage compartment and the like. According to the technical scheme, the high pressure oil rail is characterized in that one end of the high pressure oil rail body is connected with the auxiliary oil rail, and the high pressure oil rail body communicates with the auxiliary oil rail through the hole channel, the rigid ball capable of freely moving is arranged in the auxiliary oil rail, the rigid ball divides the auxiliary oil rail into the gas storage compartment and the oil storage compartment which do not communicate with each other, the gas storage compartment is filled with gas, and the oil storage compartment communicates with the high pressure oil rail body. The pressure stabilizing device is mainly used for maintaining fuel oil pressure in the high pressure oil rail stable.

Description

technical field [0001] The invention relates to the field of fuel injection systems for diesel engines, in particular to a high-pressure fuel rail with a pressure stabilizing device in a high-pressure common rail system for diesel engines. technical background [0002] High-pressure common rail fuel system and electronically controlled in-cylinder direct injection technology are widely used by modern engines because they can greatly improve fuel economy and meet increasingly stringent emission standards for nitrogen oxides, soot particles, and unburned hydrocarbons. [0003] However, the existing high-pressure common rail technology still cannot provide an absolutely stable rail pressure. Since the high-pressure fuel delivery pump periodically supplies fuel to the high-pressure fuel rail under the driving of the engine, periodic pressure disturbances also occur in the fuel rail, resulting in that the fuel pressure in the rail cannot be kept at the design value stably, but ha...

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Problems solved by technology

[0003] However, the existing high-pressure common rail technology still cannot provide an absolutely stable rail pressure

Since the high-pressure fuel delivery pump periodically supplies fuel to the high-pressure fuel rail under the driving of the engine, periodic pressure disturbances also occur in the fuel rail, resulting in that the fuel pressure in the rail cannot be kept at the design value stably, but has a large fluctuation range. In fact, The fuel pressure provided by the high-pressure fuel rail to each combustion chamber at different times is inconsistent, and the fuel injection volume of each cylinder is different, resulting in different explosion pressures of each cylinder after combustion, which affects the smoothness of engine power output

Therefore, although the existing common rail technology can reduce the corresponding dependence of the fuel supply system on the engine speed to a certain extent, it still cannot avoid the influence of pressure disturbances generated during the fuel supply process. The high-pressure fuel rail supplies fuel to the injectors to provide The fuel injection pressure is very unstable

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