Methods and system for determining fuel consumpton and fuel...

Details Methods and system for determining fuel consumpton and fuel... Methods and system for determining fuel consumpton and fuel...

G - Physics

01

F

G01F 9/00 (2006.01) B60W 40/12 (2012.01) G01M 15/04 (2006.01) G07C 5/08 (2006.01) H04Q 9/00 (2006.01)

Patent

CA 2541593

A method of determining fuel consumption in a vehicle through the OBDII bus is described. The fuel consumption is determined by using mass air flow (MAF) sensor data or manifold air pressure (MAP) sensor data, and obtaining and applying long term and short term fuel trim values for the vehicle, which respectively characterize deviations of air-to-fuel stoichiometry in the vehicle due to aging and vehicle's current operating conditions to determine the corrected fuel consumption in the vehicle. For MAP based method, an independent determining of Volumetric Efficiency of a vehicle's engine is also provided. The method is further enhanced by providing various sensing patterns for various sensor data, which depend on the rate of change of the respective data.

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