Accumulator electronically controlled fuel injection system with control chamber slider
A technology of fuel injection system and control chamber, which is applied to fuel injection devices, charging systems, machines/engines, etc., can solve the problems of difficult flexible control of fuel injection rate, decreased uniformity and stability of fuel injection process, etc. Achieve the effect of improving economy and power, reducing fluctuation of circulating fuel injection quantity, and increasing stability
Active Publication Date: 2021-04-30
HARBIN ENG UNIV
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Problems solved by technology
However, the existing pressurized electronically controlled fuel injector is restricted by the structure of the booster piston. For a certain common rail pressure, after the booster piston amplifies the fuel pressure in a certain proportion, the system can only inject fuel at a certain certain rate. It is difficult to realize flexible control of fuel injection pressure and fuel injection rate of diesel engine under different working conditions
Secondly, in the state of large fuel injection, the uniformity and stability of the fuel injection process of each cylinder is reduced
Method used
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Embodiment Construction
[0023] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0024] combine Figure 1-7 , a pressure-accumulating electronically controlled fuel injection system with a control chamber slider in the present invention, comprising a common rail pipe 9, a high-pressure fuel pipe 7, a high-pressure fuel pump 1, a filter 3, a fuel tank 4, a fuel return pipe 2 and a fuel injector 6, The right end of the common rail pipe 9 communicates with the high-pressure oil pump 1, the filter 3 and the fuel tank 4 respectively. There are multiple hydraulic oil outlets 8 on the common rail pipe 9. The number of hydraulic oil outlets 8 is determined according to the number of cylinders of the internal combustion engine. 8 communicates with the fuel inlet 20 on the fuel injector through the high-pressure fuel pipe 7 , and the low-pressure fuel return port 5 on the fuel injector communicates with the fuel tank 4 through the fuel return pipe 2 . ...
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The object of the present invention is to provide a pressure accumulating electronically controlled fuel injection system with a control chamber slider, including a common rail pipe, a fuel tank and a fuel injector. The fuel injector includes a pressure boost control valve part, a three-stage piston assembly, a fuel injection control valve part, a needle valve part, a fuel injector body, and a pressure accumulator chamber wall. The invention adopts a two-stage solenoid valve structure to control the pressurized area of the three-stage piston, which can effectively realize different pressurization ratios and make the fuel injection rule more flexible; the present invention adopts a middle-pass valve in the fuel injection control valve The stem not only simplifies the oil return passage, but also reduces the weight of the valve stem and speeds up the response speed of the fuel injection control valve; in addition, the pressure storage chamber can slow down the pressure fluctuation caused by fuel injection, which is beneficial to the accuracy of the fuel injection quantity. Control, especially for small oil volume control accuracy can be significantly improved, and the pressure stabilization function of the pressure storage chamber reduces the size of the common rail pipe, prolonging the service life of the common rail pipe.
Description
technical field [0001] The invention relates to a diesel engine, in particular to a fuel injection system for a diesel engine. Background technique [0002] The traditional mechanically controlled fuel injection system is widely used in diesel engines, and has the advantages of simple structure and high reliability. However, due to its shortcomings such as inflexible fuel injection characteristics, poor precise control of fuel volume, and slow response, it cannot meet the increasingly stringent emission regulations and cannot further improve the economy and power of diesel engines. The existing electromagnetic control fuel injection system has a faster response speed than the mechanical fuel injection system, and the precise control of the fuel quantity and the flexibility of the working characteristics can also meet the current stringent emission regulations. [0003] Due to the large cycle fuel injection volume of large and medium-sized marine diesel engines, in order to ...
Claims
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IPC IPC(8): F02M47/02F02M51/06F02M61/04F02M61/10
CPCF02M47/027F02M51/0603F02M51/061F02M61/04F02M61/10
Inventor 白云魏云鹏范立云马修真
Owner HARBIN ENG UNIV