Direct injection of diluents or secondary fuels in gaseous fuel engines

摘要

An engine system, comprising a first gaseous fuel source with a first gaseous fuel located therein coupled to one or more engine cylinders and an exhaust gas recirculation (EGR) system with a reform catalyst located therein, the reform catalyst reforming natural gas into a gas with a wider AFR operating range. The engine may thus operate at an AFR that may be outside of that available during natural gas combustion alone to allow for cooler engine operation.

主权项

1. A method for operating an engine system including:
port injecting a first quantity of a first gaseous fuel into an engine intake passage; determining a temperature of an exhaust valve of an engine cylinder; and injecting a second quantity of the first gaseous fuel into an EGR system that includes a reform catalyst therein, the second quantity a function of a desired AFR, the desired AFR determined based on the temperature of the exhaust valve.