Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine

A fuel distribution pipe and injection valve technology, which is applied in fuel injection control, mechanical equipment, engine control, etc., can solve problems such as changes in injection valves that are not considered, and achieve the effect of reducing uneven operation and reducing emissions

Active Publication Date: 2010-03-31
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the described method does not take into account rapidly occurring changes of the injection valve due to faults

Method used

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  • Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine
  • Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine
  • Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine

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Embodiment Construction

[0065] exist figure 1 The high-pressure fuel system shown in has a high-pressure fuel pump 1 . A flow control valve 2 is connected to the high-pressure pump 1 , and the flow control valve 2 delivers fuel provided by the high-pressure fuel pump 1 to a fuel distribution pipe 4 via an input line 3 . A plurality of injectors 5 is connected to the fuel distribution line 4 . In order to supply fuel to the injectors 5 , each injector 5 has an injector feed line 6 connected to the fuel distribution line 4 . Furthermore, a pressure sensor 7 , in the illustrated exemplary embodiment a high pressure sensor 7 , is shown as the pressure measuring device. The fuel pressure in fuel rail 4 can be measured with this pressure sensor 7 . A control unit (ECU), not shown in detail, is provided for actuating injection valve 5 and for controlling other variables of the high-pressure fuel system.

[0066] The control device is provided for shutting off the fuel supply to the fuel rail 4 via the f...

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Abstract

The invention relates to a method for diagnosing an injection valve (5), wherein in an overrun fuel cut-off phase the fuel supply to the fuel rail (4) is closed, and after the fuel supply has been closed off a first fuel pressure in the fuel rail (4) is measured, and after the first measurement of the fuel pressure an injection valve (5) is actuated for a test injection, after the test injection a second fuel pressure in the fuel rail (4) is measured, a differential pressure value (Delta P) is formed from the first and second measured fuel pressures and a difference of an operating parameter from a reference parameter is determined from the differential pressure value (Delta P), and when a previously defined maximum difference is exceeded the injection valve (5) is detected as being defective. The invention also relates to a device for diagnosing an injection valve (5).

Description

technical field [0001] The invention relates to a method for diagnosing an injection valve of an internal combustion engine connected to a fuel rail. [0002] Furthermore, the invention relates to a device for diagnosing an injection valve of an internal combustion engine connected to a fuel rail, which device has a pressure measuring device and a control system designed to measure the fuel pressure in the fuel rail. mechanism. Background technique [0003] In modern internal combustion engines, the fuel to be injected via injection valves into the combustion chambers of the cylinders of the internal combustion engine is often supplied via fuel rails. The fuel rail is connected to a fuel supply system, in particular to a high-pressure fuel supply system. The individual injection valves are in turn connected to the fuel distribution line, which injection valves can be actuated by means of suitable control mechanisms to inject specific fuel quantities. Such internal combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F02D41/38
CPCF02D41/3809F02D41/22F02D2200/0602F02D2041/224
Inventor M·斯塔尔C·E·米古伊斯M·韦斯
Owner VTESCO TECH GMBH
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