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Method and device for diagnosing a crankcase ventilation line for an internal combustion engine

A technology for crankcase ventilation and internal combustion engines, which is applied in crankcase ventilation, internal combustion piston engines, combustion engines, etc., and can solve problems such as increased wear and failure, and reduced expected service life of internal combustion engines

Active Publication Date: 2020-07-24
VITESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may increase the likelihood of wear and failure, and the life expectancy of the internal combustion engine may be reduced

Method used

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  • Method and device for diagnosing a crankcase ventilation line for an internal combustion engine

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Experimental program
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Effect test

Embodiment Construction

[0021] The internal combustion engine BKM comprises an intake port 1 , an engine block 2 , a cylinder head 3 and an exhaust port 4 .

[0022] In the flow direction of the intake air and starting from the intake opening 10, the intake duct 1 comprises in succession an air filter 11, an air mass flow meter 12 as a load sensor, a compressor 13 of the exhaust gas turbocharger, a charge air cooling 14, throttle valve 15, intake pipe 16 leading to cylinder Z1 via the intake duct in engine block 2. Additional sensors in the intake duct 1 required for the BKM operation of the internal combustion engine are not shown. Throttle valve 15 is preferably in the form of a throttle element (E-Gas) controlled by an electric motor, which, in addition to being actuated by the driver (driver request), can also be controlled via an electronic control unit depending on the operating zone of the internal combustion engine BKM 6 to adjust the opening cross-section of the throttle element. At the sa...

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Abstract

The invention relates to a method and a device for diagnosing a crankcase ventilation line (53) of a crankcase ventilation device (5) for an internal combustion engine (BKM) having a crankcase (20) and an intake tract (1) and a compressor (13) arranged in the intake tract (1) for compressing the intake air, wherein fresh air is channeled via a fresh air supply line (51) from the intake tract (1).Depending on a switch position of a shut-off valve (52) in the fresh air supply line (51), a flow of fresh air into a free volume of the crankcase (20) is enabled or inhibited, the free volume of thecrankcase (20) is connected to the intake tract (1) upstream of the compressor (11) by means of the crankcase housing ventilation line (53), during the process of crankcase ventilation the nitrogen oxide concentration in the crankcase ventilation line (53) close to the point of introduction into the intake tract (1) upstream of the compressor (13) is detected by means of a nitrogen oxide sensor (56) and, depending on the detected nitrogen oxide concentration, the tightness of the crankcase ventilation line (53) is evaluated.

Description

technical field [0001] The invention relates to a method and a device for diagnosing a crankcase ventilation line of an internal combustion engine. Background technique [0002] Especially immediately after a cold start of the internal combustion engine, unburned fuel dissolves in the lubricant of the internal combustion engine and then evaporates again as the operating temperature increases. For example, in a reciprocating piston internal combustion engine fueled by gasoline or diesel, the fuel will condense on and dissolve in the oil film on the cold wall of the combustion chamber in the first few seconds after a cold start. This problem occurs primarily with direct injection of fuel into the combustion chamber, especially in gasoline engines, but also in other fuel supply methods and in other internal combustion engines. [0003] Dissolution of fuel and lubricant leads to undesired changes in the lubricating properties of the lubricant. This may increase the likelihood ...

Claims

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Application Information

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IPC IPC(8): F02D41/22F02M25/06F01M13/02F01M13/04
CPCF02D41/22F02M25/06F01M13/04F01M2013/027F02D2250/08F01M13/00F01M11/10F02D41/1439F02D41/146F02D41/0007Y02T10/40Y02T10/12F01M13/0011F01M13/022F02D2041/228F02D2200/02F02M35/10157
Inventor 张宏
Owner VITESCO TECH GMBH
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