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Fuel injection system

A technology of fuel injection system and nozzle, which is applied in the direction of fuel injection pump, fuel injection device, charging system, etc.

Inactive Publication Date: 2007-12-19
VOLVO LASTVAGNAR AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, such systems have a limited range of injection timing and require the application of mechanical actuation each time an injection is due

Method used

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  • Fuel injection system
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Embodiment Construction

[0016] According to a first embodiment of the invention shown in FIG. 1, a fuel injector 1 is provided which combines a conventional normally closed nozzle 2 and an electrically operated nozzle control valve (NCV) 3; A mechanical actuating device 4 for pressurized fuel, comprising a cam-driven plunger 5 with a cam 6 and a plunger cavity 7, a return spring 8 and an electrically operated valve 9; one usually serving a set of said fuel A common rail 10 for the injectors and a mechanical actuation device in the engine (not shown), a device 11 for boosting the common rail and regulating the pressure in the common rail at the desired level; a return with a lower pressure Oil pipeline 12 and a fuel tank 13. An electronic control unit (not shown) controls the pressure in the common rail 10 and controls the valves 3 and 9 .

[0017] The fuel injector 1 is designed to work like a high pressure common rail injector of the type known from the prior art. As this known injector generally ...

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PUM

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Abstract

A fuel injection system for an internal combustion engine comprises a nozzle (2) with an inlet and a cam-driven plunger (5) forming a plunger chamber (7) which is connected to the inlet of the nozzle. The injection sysstem also comprises a common rail (10) for fuel and a control valve (9) installed between the plunger chamber (7) and the common rail (10), wherein the control valve is able to open or close hydraulic communication between the plunger chamber and the common rail upon receiving an electrical control command. An electrically actuated nozzle control valve (21) is used for opening and closing of the nozzle (2). The system also comprises a means (11) for pressurizing the common rail and regulating pressure of the fuel in the common rail (10).

Description

technical field [0001] The invention relates to a device for injecting fuel into an internal combustion engine, in particular a compression ignition engine. Background technique [0002] The most common devices for injecting fuel into modern diesel engines can be divided into two functionally distinct categories: mechanically actuated systems and common rail systems. Most high power diesel engines used in commercial vehicles employ mechanically actuated electronically controlled integral injector / unit pump systems. The small power diesel engine market is dominated by pump-to-nozzle in-line mechanically actuated fuel injection systems (FIE) or so-called high pressure common rail systems. [0003] There are several types of mechanically actuated integral injectors / unit pumps and they all produce very high injection pressures with relatively good hydraulic / mechanical efficiency, which is one of their most important advantages over common rail systems one. Another important a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M63/00F02M61/20F02M47/02F02M51/06F02M57/02F02M59/20F02M63/02
CPCF02M47/027F02M51/0603F02M57/023F02M63/0007F02M63/0225
Inventor 萨吉·尤达诺夫
Owner VOLVO LASTVAGNAR AB
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