Adaptive fuel strategy for hybrid electric vehicle

Details Adaptive fuel strategy for hybrid electric vehicle Adaptive fuel strategy for hybrid electric vehicle

B - Operations, Transporting

60

K

B60K 15/00 (2006.01) F02D 11/10 (2006.01) F02D 41/00 (2006.01) F02D 41/08 (2006.01) F02D 41/14 (2006.01) F02M 25/08 (2006.01) B60K 6/04 (2006.01)

Patent

CA 2365663

This invention is a method and system for a hybrid electric vehicle adaptive fuel strategy to quickly mature an adaptive fuel table. The strategy adaptively alters the amount of fuel delivered to an internal combustion engine to optimize engine efficiency and emissions using engine sensors. Before the adaptive fuel strategy is permitted, an engine "on" idle arbitration logic requires the HEV to be in idle conditions, with normal battery state of charge, normal vacuum in the climate control and brake system reservoir; and, the vapor canister not needing purging, The strategy orders the engine throttle to sweep different airflow regions of the engine to adapt cells within the adaptive fuel table. In the preferred configuration, a generator attached to the vehicle drive train, adds and subtracts torque to maintain constant engine speed during the throttle sweeps.

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