Patent ID: 9689335
Date: 2017-06-27
CPC Classifications: F02D,F02M,Y02T

Claim:
1. A method for determining an engine mass air flow (MAF) for use in an engine air to fuel ratio (AFR) calculation to operate an engine, the method comprising: monitoring engine operation with an electronic controller, the monitoring including monitoring a first group of engine parameters and a second group of engine parameters, the first group being related to fluid pressures at various engine locations, the second group being related to valve positions of various engine actuators; determining, with the electronic controller, a first estimation of engine MAF based on one parameter from the first group of engine parameters; determining, with the electronic controller, a second estimation of engine MAF based on one parameter from the second group of engine parameters; determining, with the electronic controller, an operating state of the engine, the operating state of the engine being determined as steady-state or transient; selecting one of the first estimation of engine MAF and the second estimation of engine MAF based on the operating state of the engine; and using the selected one of the first estimation of engine MAF or the second estimation of engine MAF in the engine AFR calculation to operate the engine,