Patent ID: 9388761
Filing Date: 2016-07-12
CPC Classification: F02D,F02M,Y02T

Claim Text:
1. A method of operating an internal combustion engine with gaseous fuel, the method comprising: providing a plurality of cylinders having respective pistons and combustion chambers; providing an intake system including a throttle body, and an intake manifold, ; and providing a fuel system configured to supply a quantity of fuel and inject the fuel in a gaseous state, the fuel supply system including operating the internal combustion engine at a steady-state partial load with a first portion of gaseous fuel supplied by the central fuel injector and a second portion of gaseous fuel supplied by the plurality of cylinder-dedicated fuel injectors; identifying a demand for a change in total fuel amount for the engine to a target total fuel amount, the demand defining a transition point; identifying a target fraction of the total fuel amount for each of the central fuel injector and the plurality of cylinder-dedicated fuel injectors for steady-state operation at the target total fuel amount; and responding to the change by gradually changing the fuel amount from the central fuel injector to the corresponding target fraction within a first time span from the transition point and, within a second time span from the transition point, shorter than the first time span, exceeding the corresponding target fraction for the plurality of cylinder-dependent fuel injectors to compensate for the slower response of the central fuel injector and meet the target total fuel amount prior to expiration of the first time span.