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Method for acquiring a characteristic point of the stroke movement of a closure element of an injector and injection system

A technology of blocking components and injection systems, which is applied in the directions of machines/engines, fuel injection control, engine control, etc., can solve problems such as insufficient detection, and achieve the effect of eliminating insecurity and measurement errors

Active Publication Date: 2017-11-28
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in this practice, problems are caused by weak signals, especially caused by small injection quantities at high pressure
These weak signals have no or only insufficient signal characteristics (Signalausprägung) or only minimal characteristics (Ausprägung), so that the corresponding event or characteristic point of the reciprocating movement of the locking element cannot or only insufficiently be detected

Method used

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  • Method for acquiring a characteristic point of the stroke movement of a closure element of an injector and injection system
  • Method for acquiring a characteristic point of the stroke movement of a closure element of an injector and injection system
  • Method for acquiring a characteristic point of the stroke movement of a closure element of an injector and injection system

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Embodiment Construction

[0039] exist figure 1 The injection system 1 for injecting the injection quantity of the fluid is shown schematically in a block diagram. The injection system 1 comprises a control device 2 as well as injection nozzles 3 and a computing unit 4 . The injection nozzle 3 comprises a blocking element 7 , which in the exemplary embodiment shown is a nozzle needle which is placed in a nozzle needle seat, a drive device 5 and a sensor 6 . The drive device 5 is a piezoelectric actuator which, by applying a voltage, changes the shape of the piezoelectric crystal contained therein and thus raises or lowers the locking element 7, ie guides the locking element 7 in a reciprocating motion. The locking element 7 is described. For this purpose, the locking element 7 is rigidly connected to the drive device 5 and is pressed downwards from the peripheral wall 10 of the injection nozzle 3 by means of a spring 9, so that the locking element 7 is in the rest state, ie not in use. When the driv...

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Abstract

A method for acquiring a characteristic point of the stroke movement of a closure element of an injector and an injection system are described. The signal of a drive device for the closure element is used to detect the characteristic point, and specific pre-processing of this signal is carried out. The signal which is made available is tilted to the setpoint signal gradient, and a minimum or maximum of the tilted signal is determined, and the characteristic point of the stroke movement of the closure element is determined therefrom. The injection system has a sensor which is configured to make available a signal of the drive device for the characteristic point, and a computing unit which is configured to carry out the specific signal pre-processing.

Description

technical field [0001] The invention relates to a method for detecting a characteristic point of a reciprocating movement of a locking element of an injector, wherein a signal for a drive device of the locking element is used to detect the characteristic point. Background technique [0002] In injection systems for internal combustion engines, a multipoint (sub)injection model is usually implemented with some very small intervals. The aim here is to optimize the combustion with respect to emissions, combustion noise and consumption by means of the injection model (Einspritmuster) and the injection curve. For this purpose, the injection system must ensure a high quantity accuracy of the individual injections. Another important aspect is the precise implementation of the driver's desired torque, wherein a magnitude error mostly leads directly to a torque error. The higher the number of injection operations, the more strongly the injection quantity errors add up as torque dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/20F02D41/24
CPCF02D41/2096F02D41/2467F02D2041/2055F02D2041/286F02D2200/0618F02D2200/063
Inventor A.施瓦特
Owner VTESCO TECH GMBH