System and method for performing evaporative leak diagnostics in a vehicle

A technology for vehicles and fuel systems, applied in liquid tightness measurement using liquid/vacuum degree, fluid tightness test, machine/structural component test, etc., can solve problems such as inability to obtain vacuum, and improve diagnostic accuracy Effect

Active Publication Date: 2012-08-22
FORD GLOBAL TECH LLC
View PDF5 Cites 10 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System and method for performing evaporative leak diagnostics in a vehicle
  • System and method for performing evaporative leak diagnostics in a vehicle
  • System and method for performing evaporative leak diagnostics in a vehicle

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A vehicle is provided with a fuel system, a controller, and a diagnostic module with 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 in response to comparing a series or measured pressures to the threshold. A method for performing an evaporative leak diagnostic is provided. A valve in a diagnostic module is commanded to a vent position. A pump is operated to measure a reference pressure across an orifice to provide a threshold. A valve is commanded to a test position. The pump is operated to place the fuel system in a low pressure state, and a series of pressures in the fuel system is 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap