System and method for evaporative leak diagnosis in a vehicle

A technology for vehicles and fuel systems, which is used in liquid/vacuum measurement for liquid tightness, fluid tightness testing, and machine/structural component testing. It can solve problems such as inability to obtain vacuum and improve diagnostic accuracy. Effect

Active Publication Date: 2017-03-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With vehicles such as hybrids, the engine may never be on during the drive cycle, so the natural vacuum cannot be achieved

Method used

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  • System and method for evaporative leak diagnosis in a vehicle
  • System and method for evaporative leak diagnosis in a vehicle
  • System and method for evaporative leak diagnosis in a vehicle

Examples

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Embodiment Construction

[0026] Detailed embodiments of the present invention are shown herein as required; however, it is to be understood that the disclosed embodiments are merely exemplary and may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as representative fundamentals for teaching one skilled in the art to variously employ the claimed subject matter.

[0027] exist figure 1 In , an embodiment of a hybrid electric vehicle (HEV) 10 is schematically shown. In this powertrain configuration, there are two power sources connected to the driveline 12, 14: 12) a combination of engine and generator subsystems interconnected using planetary gear sets, and 14) the electric drive system (electric motor, generator machine and battery subsystem). The battery...

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Abstract

The present invention discloses a vehicle having a fuel system, a controller and a diagnostic module having an orifice, a pressure sensor and a pump, the module connecting the fuel system to atmosphere. The controller measures a reference pressure across the orifice to provide a threshold, isolates the fuel system and provides a code responsive to comparisons of a series of measured pressures to the threshold. The invention discloses a method for diagnosing evaporation leakage. The valve in the diagnostic module is commanded to the vent position. The pump is operated to measure a reference pressure across the pore to provide a threshold. The valve is commanded to the test position. The pump is operated to set the fuel system at a low pressure state, and a series of pressures in the fuel system are measured. A diagnostic code is provided after comparing the series of pressures to the threshold.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 444,249, filed February 18, 2011, the entire contents of which are hereby incorporated by reference. technical field [0003] Various embodiments relate to performing evaporative leak diagnostics in a fuel system coupled to an internal combustion engine. Background technique [0004] The vehicle may require diagnostics to verify the integrity of the fuel system, such as the fuel vapor collection system, for potential leaks. Natural vacuum techniques or engine vacuum techniques have been used to provide vacuum levels for diagnostic purposes. In conventional vehicles a natural vacuum is provided in the fuel tank by the heat rejected from the running internal combustion engine. With vehicles such as hybrids, the engine may never be turned on during the drive cycle, so a natural vacuum cannot be achieved. Contents of the invention [0005] In one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/32G01M3/34
CPCG01M3/025G01M3/3263G01M3/34G01M15/09
Inventor R·R·延茨D·A·克莱门斯A·I·德泽利亚A·M·杜德尔M·I·克鲁兹尼尔
Owner FORD GLOBAL TECH LLC
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