Jun Cai - Fairport NY, US Daniel C. Di Fiore - Scottsburg NY, US Steven R. Falta - Honeoye Falls NY, US Sergio E. Garcia - Webster NY, US Carol A. Galskoy - Webster NY, US
Assignee:
GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI
International Classification:
G01L 27/00 H01M 8/06
US Classification:
73 157, 429415
Abstract:
A system and method for detecting an anode pressure sensor failure in a fuel cell system. The system and method include a controller that sets an initial minimum anode pressure sensor value and an initial maximum anode pressure sensor value. The controller determines a desired time interval for sampling anode pressure measurements and determines a total number of samples of anode pressure measurements to be collected by the controller from an anode pressure sensor. The controller also compares a pressure difference between the initial or a measured minimum anode pressure and the initial or a measured maximum anode pressure to a predetermined pressure difference threshold and sets a pressure sensor fault if the pressure difference between the initial or measured minimum anode pressure and the initial or maximum anode pressure is less than the predetermined pressure difference threshold.
Method Of Validating A Diagnostic Purge Valve Leak Detection Test
Daniel R. Meacham - Mendon NY, US Timothy K. Sheffer - Rush NY, US Mitchell G. Ober - Northville MI, US Kenneth M. Simpson - Swartz Creek MI, US Carol Galskoy - Webster NY, US
A system and method for evaluating the integrity of a leak detection test for a purge valve of a fuel system in a vehicle reduces or eliminates false failures. The method is executed on an engine control module (ECM) and is configured to determine when vehicle soak conditions meet first criteria conducive to fuel vapor condensation in the fuel tank. The first criteria include a predetermined temperature drop in ambient air temperature between successive drive cycles. The ECM is further configured to determine when a vehicle maneuver meets second criteria indicative of the capability of the maneuver to initiate fuel slosh in the fuel tank, to thereby establish a trigger event. The ECM is further configured to determine, after the trigger event, the maximum slope of a fuel tank vacuum increase. The ECM is still further configured to produce a slope ratio as a function of the maximum vacuum increase slope and a reference vacuum slope corresponding to a slope that is unaffected by any slosh/condensation events. The ECM is configured to invalidate a purge leak test when the slope ratio exceeds a threshold.