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Crankcase Integrity Leak Detection

A technology for crankcase ventilation and changing curve diagram, which is applied to crankcase ventilation, lubrication indicating device, lubrication parts, etc., can solve problems such as increasing the accuracy of diagnostic procedures, increasing redundancy, increasing system cost and complexity, etc.

Active Publication Date: 2017-11-21
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As another example, utilizing multiple sensors and valves increases system cost and complexity
As yet another example, depending on the location of the sensors, some combinations of sensors may read essentially the same pressure under certain conditions, resulting in increased redundancy without increasing the accuracy of the diagnostic procedure

Method used

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  • Crankcase Integrity Leak Detection
  • Crankcase Integrity Leak Detection
  • Crankcase Integrity Leak Detection

Examples

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Embodiment Construction

[0028] The following description refers to systems used to monitor engine crankcase ventilation (eg, figure 1 systems and methods for crankcase ventilation system integrity in The output of one or more pressure or flow sensors, such as a pressure sensor disposed in the crankcase ventilation tube of the crankcase ventilation system, can be used to identify a crankcase system leak, the location of the leak, PCV valve degradation, and air filter The cleaner is clogged. The engine controller can be configured to execute various programs such as Figure 2A -B and Figure 3-6 to indicate crankcase ventilation system degradation based on changes in crankcase vent tube pressure (or air flow) during engine cranking and changes in crankcase vent tube pressure relative to changes in manifold air flow during engine operation. The crankcase vent tube pressure sensor may be oriented to read static or dynamic pressure. Furthermore, it may be located in the venturi (neck-like constriction...

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PUM

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Abstract

The present invention discloses a method and system for diagnosing the location and nature of a crankcase system integrity breach using a crankcase vent tube pressure or flow sensor. The sensor can also be used to diagnose air filter clogging and PCV valve degradation. Utilizing existing sensors to diagnose multiple engine components offers the benefits of cost reduction and sensor simplification.

Description

technical field [0001] The invention relates to the detection of crankcase integrity leaks. Background technique [0002] The engine may include a crankcase ventilation system to vent gases outside the crankcase and into the engine intake manifold to continuously draw gases from inside the crankcase in order to reduce degradation of various engine components in the crankcase. During certain conditions, the crankcase ventilation system may be monitored to identify leaks in the system. For example, the fresh air hose (snorkel) could become disconnected, the oil cap could come off or come loose, the dipstick could be displaced, and / or other seals in the crankcase ventilation system could be broken, causing various components degrade. [0003] Various approaches may be used to monitor crankcase ventilation system integrity. For example, a leak-by-air approach can be utilized in which a pressure sensor in the crankcase and a valve in the PCV fresh air hose are opened and a lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01M13/00
CPCF01M11/10F01M13/021F01M13/023F01M2013/027F02D2250/08
Inventor J·E·罗林格R·R·珍特R·D·皮尔西弗
Owner FORD GLOBAL TECH LLC