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Fuel-injection system

A fuel injection system and fuel technology, which are applied to fuel injection pumps, fuel injection devices, fuel injection control and other directions, can solve problems such as noise and achieve the effect of reducing peak torque

Active Publication Date: 2015-12-16
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the periodic opening and closing of the inlet valve causes noise, the frequency of which is a function of the speed of the drive shaft of the high pressure pump

Method used

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Examples

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Embodiment Construction

[0018] figure 1 An exemplary embodiment of a fuel injection system 10 is shown, which can be designed, for example, as a common rail fuel injection system. The fuel injection system includes a high-pressure pump 100 with a pump working space 101 for compressing fuel. The high-pressure pump has a pump piston 102 which is supported on the tappet by means of a spring. A tappet is movably disposed in the tappet guide. In order to compress the fuel in the pump working space, the pump piston performs a complete up and down movement in the pump working space 101 during each pump stroke. To move the pump piston, the tappet is coupled to the drive shaft. The drive shaft can have one or more cams on which the tappet rests via rollers. During rotation of the drive shaft, the rotational motion of the shaft is converted by the cam into reciprocating motion of the piston.

[0019] The fuel injection system 10 further has a pressure accumulator 110 for supplying fuel for injection into ...

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Abstract

A fuel-injection system (10) comprises a control unit (140) which controls the injection of a fuel cylinder of an engine in such a way that an injection volume (EV1, EV2, EV3) of the fuel is injected into in each case one of the cylinders during a work cycle (A1, A2, A3) of the engine. To this end, the control unit actuates an inlet and / or outlet valve (120, 130) in such a way that, during pump strokes (PH) of a high-pressure pump (100) which follow one another, a different high-pressure volume of the fuel per pump stroke (PH) is delivered into a pressure accumulator (110) during at least two work cycles (A1, A2) which follow one another. The high-pressure volume which is produced per work cycle (A1, A2) corresponds to the injection volume (EV1, EV2) which is removed from the pressure accumulator per work cycle and is constant during each of the work cycles (A1, A2) which follow one another.

Description

technical field [0001] The invention relates to a fuel injection system, in particular to a common rail fuel injection system. Background technique [0002] In a common rail fuel injection system, injection pressure can be developed independently of engine speed and injection quantity. The separation of pressure generation and injection is done by means of a pressure accumulator (rail). To generate pressure, a high-pressure pump (HDP) is provided, which delivers fuel into the pressure accumulator. A high pressure pump can be connected to the fuel tank by a fuel inlet conduit and to the pressure accumulator by a fuel outlet conduit. The high-pressure pump compresses the fuel supplied from the fuel inlet line and generates a high-pressure volume of fuel in the pump working space, which is discharged to the pressure accumulator. When fuel is injected into the cylinder, the injection volume of fuel is taken from the pressure accumulator. [0003] An inlet valve is provided i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/38F02M59/36
CPCF02D41/3809F02D41/3845F02M59/366F02M63/025F02D41/3082F02D2041/2027
Inventor T.施米德鲍尔
Owner VTESCO TECH GMBH
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