Onboard fuel injector test

Details Onboard fuel injector test Onboard fuel injector test

2007-06-12

2009-06-09

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Fuel system or part thereof

Reexamination Certificate

active

07543485

ABSTRACT:
A method of testdiagnosing the operation of each of a plurality of fuel injectors of an internal combustion engine system includes inhibiting ignition of the engine, monitoring a fuel pressure within a fuel rail of the engine and pulsing a fuel injector of the plurality of fuel injectors of the engine. Whether the fuel pressure has stabilized is determined and a pressure differential is calculated based on a pre-pulse fuel pressure and a post-pulse fuel pressure when the fuel pressure has stabilized. A technician determines whether the fuel injector is operating properly based on the pressure differential.

REFERENCES:
patent: 5708202 (1998-01-01), Augustin et al.
patent: 7197918 (2007-04-01), Shen
patent: 2004/0025846 (2004-02-01), Draper et al.
patent: 2006/0144367 (2006-07-01), Futonagane et al.
patent: 2008/0103676 (2008-05-01), Ancimer et al.

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