Piezoelectric-electromagnetic dual-valve electronically controlled fuel injector with variable injection schedule
A fuel injection regular and variable technology, applied to fuel injection devices, machines/engines, charging systems, etc., can solve problems such as increased control difficulty, achieve high reliability, reduce emission pollution, and improve combustion performance
Active Publication Date: 2020-12-04
HARBIN ENG UNIV
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Problems solved by technology
To organize the ideal combustion process of a diesel engine, it is required that the fuel injection rate should be low first and then high, and the fuel injection should be completed quickly. There are many inconveniences in the application
Method used
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Embodiment Construction
[0021] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0022] combine Figure 1-5, the piezoelectric-electromagnetic double-valve electronically controlled fuel injector with variable fuel injection rules of the present invention includes a fuel injector head 1, a boost control valve 2, a boost piston 3, a fuel injection control valve 4, a nozzle 5, a tight The cap 6 and the injector body 7, the injector head 1 is installed on the injector body 7, the boost control valve 2, the boost piston 3, the fuel injection control valve 4 and the nozzle 5 are installed on the injector in turn from top to bottom. Inside the fuel injector body 7, the tight cap 6 is fastened together with the fuel injector body 7 through threads.
[0023] The boost control valve 2 is installed in the fuel injector body 7, and the boost control valve 2 includes an electrical connector 9, an upper valve seat 10 of the boost control valve, a lower va...
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The invention is aimed to provide a piezoelectric-electromagnetic double valve electronically controlled injector with variable fuel injection characteristics. The piezoelectric-electromagnetic doublevalve electronically controlled injector with variable fuel injection includes a fuel injector head, a pressurized control valve, a pressurized piston, a fuel injection control valve, a nozzle and afuel injector body. According to the piezoelectric-electromagnetic double valve electronically controlled injector with the variable fuel injection characteristics, a piezoelectric stack and an electromagnetic valve are respectively used for controlling a pressurization process and a fuel injection process, so that the injection process of the piezoelectric-electromagnetic double-valve electronically controlled injector with variable injection pattern of the invention is not restricted by the pressurization process, and thus the invention can work in two modes of non-boosting and boosting, performing rail pressure injection in the non-supercharging mode, super high pressure injection in the supercharging mode, and changing the control of the supercharging control valve in the superchargingmode. The strategy is to achieve flexible adjustment of the supercharging ratio, which has higher reliability and wider application range. A hydraulic compensation piston achieves the fuel injectioncharacteristics of the piezoelectric-electromagnetic double valve electronically controlled injector, and has the advantages of promptly oil cut-off to improve dynamic property and economy of a dieselengine.
Description
technical field [0001] The invention relates to a diesel engine, in particular to a diesel engine fuel system. Background technique [0002] With the increasingly prominent global energy problems and increasingly stringent emission regulations, the electronically controlled high-pressure common rail system has become one of the most effective technical means to improve the performance of diesel engines and reduce the emission of harmful substances. The high-pressure common rail system can not only provide higher injection pressure, but also form multiple injections consisting of pre-injection, main injection and post-injection. The quality of the combustion process of a diesel engine largely depends on the fuel injection law. Choosing different forms of fuel injection law according to different working conditions can make the diesel engine obtain good power and economy. [0003] The electronically controlled fuel injector overcomes the problem that the fuel injection schedu...
Claims
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IPC IPC(8): F02M47/02F02M51/06F02M61/10F02M61/18F02M63/00
CPCF02M47/02F02M51/061F02M61/10F02M61/18F02M63/0026
Inventor 范立云兰奇白云宋恩哲
Owner HARBIN ENG UNIV