Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
Or Particle Contamination?
Note this article is out in 2009, well after the CP 4 design is frozen.
Real eye opener --- filtration standards not good enough because of vibration of filter, viscosity, need better standard.
Also note where the authors are from...
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Procedure for determining the allowable particle contamination for diesel fuel injection equipment (FIE)
Authors: von Stockhausen, Alexander1 ; Mangold, Martin P.1 ; Eppinger, Dieter1 ; Livingston, Thomas C.2
Author affiliation:
1 Robert Bosch GmbH, Germany
2 Robert Bosch LLC, Germany
Corresponding author: von Stockhausen, A.
Source title: SAE International Journal of Fuels and Lubricants
Abbreviated source title: SAE Int. J. Fuels Lubr.
Volume: 2
Issue: 1
Issue date: 2009
Publication year: 2009
Pages: 294-304
Language: English
ISSN: 19463952
E-ISSN: 19463960
Document type: Journal article (JA)
Publisher: SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, United States
Abstract: Increasing injection pressures together with Diesel fuel lubricated Common Rail pumps replacing oil lubricated systems demand a more sophisticated investigation of robustness and durability against particle contamination of fuel. The established way of requiring filtration efficiency levels per lab standard is not significant enough if we look at variable factors like vibration of the fuel filter and viscosity of the fuel. Because these and other factors tremendously influence filtration efficiency, future Diesel FIE cleanliness requirements will need to define an allowable contamination limit downstream of the filter. More precisely, this is not a scalar limit but a contamination collective that considers the varying vehicle filtration and operating environment. This paper describes a procedure for defining allowable contamination limits of the FIE components. The procedure includes sensitivity, robustness and "key life" tests. The latter one is similar to a S-N curve (Woehler curve) and is the basis for the damage accumulation model of particle contamination. © 2009 SAE International.
Note this article is out in 2009, well after the CP 4 design is frozen.
Real eye opener --- filtration standards not good enough because of vibration of filter, viscosity, need better standard.
Also note where the authors are from...
----------------
Procedure for determining the allowable particle contamination for diesel fuel injection equipment (FIE)
Authors: von Stockhausen, Alexander1 ; Mangold, Martin P.1 ; Eppinger, Dieter1 ; Livingston, Thomas C.2
Author affiliation:
1 Robert Bosch GmbH, Germany
2 Robert Bosch LLC, Germany
Corresponding author: von Stockhausen, A.
Source title: SAE International Journal of Fuels and Lubricants
Abbreviated source title: SAE Int. J. Fuels Lubr.
Volume: 2
Issue: 1
Issue date: 2009
Publication year: 2009
Pages: 294-304
Language: English
ISSN: 19463952
E-ISSN: 19463960
Document type: Journal article (JA)
Publisher: SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, United States
Abstract: Increasing injection pressures together with Diesel fuel lubricated Common Rail pumps replacing oil lubricated systems demand a more sophisticated investigation of robustness and durability against particle contamination of fuel. The established way of requiring filtration efficiency levels per lab standard is not significant enough if we look at variable factors like vibration of the fuel filter and viscosity of the fuel. Because these and other factors tremendously influence filtration efficiency, future Diesel FIE cleanliness requirements will need to define an allowable contamination limit downstream of the filter. More precisely, this is not a scalar limit but a contamination collective that considers the varying vehicle filtration and operating environment. This paper describes a procedure for defining allowable contamination limits of the FIE components. The procedure includes sensitivity, robustness and "key life" tests. The latter one is similar to a S-N curve (Woehler curve) and is the basis for the damage accumulation model of particle contamination. © 2009 SAE International.
