Dual-control value type variable pump
A variable pump, dual control technology, applied in engine components, machines/engines, charging systems, etc., can solve the problem that the rail pressure and fuel injection volume are difficult to achieve precise control, and affect the fuel injection rate and fuel injection volume of each cylinder. , affecting the combustion characteristics and other issues, to achieve the effect of precise and flexible control, strong operability, and improved safety
Inactive Publication Date: 2016-09-07
CHINA NORTH ENGINE INST TIANJIN
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Problems solved by technology
Most of the high-pressure common rail fuel injection systems currently used are single-valve control variable pump fuel injection systems, and it is difficult to accurately control the fuel rail pressure and fuel injection volume.
Because each fuel injection of the high-pressure common rail injector will cause fluctuations in fuel rail pressure, it will inevitably affect the fuel injection rate and fuel injection volume of each cylinder, thereby affecting the combustion characteristics
Method used
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[0014] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0015] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...
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The invention provides a dual-control value type variable pump which comprises a variable pump body and a dual-control valve type device, wherein the dual-control valve type device comprises an ECU and a metering valve, a sensor and a pressure control valve which are electrically connected to the ECU; one end of the variable pump body is connected to a cam, and the other end of the variable pump body is connected to both an output end of a low-pressure fuel pipe and an input end of a high-pressure fuel pipe; the sensor is mounted above the high-pressure fuel pipe; the pressure control valve is mounted on a bypass oil way of the high-pressure fuel pipe; and the metering valve is mounted at an inlet position of the low-pressure fuel pipe. According to the dual-control value type variable pump, the condition that the fuel pressure of a fuel injection system is stable can be met, thereby achieving accurate and flexible control over fuel injection laws of respective cylinders; meanwhile, the system can timely generate high pressure according to injection requirements, rather than keeping high pressure in a fuel rail all the time, thereby reducing processing difficulty of the fuel system, improving the safety of the system and achieving very strong operability.
Description
technical field [0001] The invention belongs to the field of engine fuel injection systems, in particular to a double control valve type variable pump for improving fuel pressure stability and fuel injection capability. Background technique [0002] Diesel engines need to meet increasingly lower emission regulations and meet the requirements of reducing fuel consumption by improving combustion efficiency. A key factor in achieving efficient combustion is optimizing the fuel injection process. Most of the currently used high-pressure common rail fuel injection systems are single-valve control variable pump fuel injection systems, and its fuel rail pressure and fuel injection volume are difficult to achieve precise control. Because each fuel injection of the high-pressure common rail injector will cause fluctuations in fuel rail pressure, it will inevitably affect the fuel injection rate and fuel injection volume of each cylinder, thereby affecting the combustion characterist...
Claims
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IPC IPC(8): F02M63/02
CPCF02M63/024F02M63/0245F02M63/027
Inventor 李华乐李汝宁徐春龙赵中余高怡吕帆
Owner CHINA NORTH ENGINE INST TIANJIN