Abstract: A diagnostic system and method identifies fuel injector failure in a fuel cell system including a fuel processor and a fuel source. A fuel injector supplies fuel from the fuel source to the fuel processor. A pressure sensor generates a pressure signal based on pressure between the fuel source and the fuel injector. A fuel injector diagnostic identifies fuel injector failure based on the pressure signal. The fuel injector diagnostic includes a moving window tracker that tracks the pressure signal over a moving window. The fuel injector diagnostic further includes a standard deviation or variance calculator that generates a standard deviation or variance based on the pressure signal in the moving window.
Type:
Grant
Filed:
June 6, 2002
Date of Patent:
June 29, 2004
Assignee:
General Motors Corporation
Inventors:
Bruce J. Clingerman, Donald H. Keskula, Julie A. Stuart