Resonance perforated-plate type electronic control fuel injector with hydraulic feedback function
An electronically controlled fuel injection and fuel injector technology, which is applied in the direction of machines/engines, fuel injection devices, engine components, etc., can solve the problems of large dynamic oil return, energy loss, etc., to reduce pressure fluctuations and improve pressure fluctuations , to ensure the normal and stable effect
Active Publication Date: 2017-05-31
HARBIN ENG UNIV
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Problems solved by technology
This part of high-pressure fuel is pressurized by the oil pump, but it returns directly to the fuel tank without doing work. The dynamic oil return is large, resulting in energy loss
Method used
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[0021] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0022] combine Figure 1-5 , The present invention includes an injector head 1 , a restrictor valve assembly 3 , a solenoid valve assembly 5 , a needle valve assembly 6 , a tight cap 9 , and an injector body 10 . The fuel injector head 1 is mounted on the fuel injector body 10 through threaded fitting connection, and is sealed by the sealing ring 2 placed on the fuel injector body 10 . A main oil inlet hole 12 is arranged in the injector head 1 and communicates with the pressure accumulator chamber 11 in the injector body 10 . A restrictor valve assembly 3 is arranged below the accumulator chamber 11 . The flow limiting valve assembly 3 is installed inside the fuel injector body 10, and its main structure includes a retaining ring 13, a damping spring 14, a ball valve 16, a support control slider 17, a ball valve return spring 22, a ball valve return spring seat...
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The invention aims to provide a resonance perforated-plate type electronic control fuel injector with a hydraulic feedback function. The resonance perforated-plate type electronic control fuel injector with the hydraulic feedback function comprises a fuel injector head, a fuel injector body, a flow limiting valve assembly, an electromagnetic valve assembly, a needle valve assembly and other components. A pressure accumulation cavity is formed in the fuel injector body and communicates with a main fuel inlet hole and the flow limiting valve assembly, and it is guaranteed that when large-pulse-width fuel injection is conducted, the fuel injection process of each cylinder is stable. The flow limiting valve assembly is arranged below the pressure accumulation cavity and prevents abnormal fuel injection from continuously proceeding. The bottom of the fuel injector body is provided with the electromagnetic valve assembly, a valve rod is driven by electromagnetic force to move, and a flexible fuel injection strategy and a fuel injection process high in response speed and control precision can be achieved. Because a feedback fuel channel is additionally arranged in the electromagnetic valve assembly, start of a needle valve is slowed down, and seating of the needle valve is accelerated. Double-channel fuel feeding is conducted through a throttling hole of a perforated plate in the needle valve assembly and an annular side fuel channel in the needle valve assembly, so that the pressure buildup process of a control cavity is further accelerated, and the response speed of seating of the need valve is greatly improved.
Description
technical field [0001] The invention relates to an engine fuel injection device, in particular to a high-pressure common rail fuel injection device. Background technique [0002] At present, the market is gradually adopting high-speed solenoid valve injectors to meet the latest emission regulations. The prominent feature of this electronically controlled fuel injector is to use the electrical signal output by the electronic control unit to control the high-speed solenoid valve to achieve flexible fuel injection rules. The fuel injector with high-speed solenoid valve has fast system response, high control precision and the ability to inject multiple times. But this electronically controlled fuel injector also has a place to be improved: during the fuel injection process, there is always high-pressure fuel flowing through the inlet and outlet orifices. This part of high-pressure fuel is pressurized by the oil pump, but returns directly to the fuel tank without doing any work...
Claims
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IPC IPC(8): F02M47/02F02M61/10F02M61/18F02M63/00
CPCF02M47/027F02M61/10F02M61/1853F02M61/1893F02M63/0017F02M63/0035F02M63/0049F02M63/007
Inventor 范立云张孝勇袁志国刘友
Owner HARBIN ENG UNIV
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