SYSTEM AND METHOD OF OPERATING AN INTERNAL COMBUSTION ENGINE

摘要

A method of operating an internal combustion engine is provided. The method includes combusting a mixture of fresh air and fuel within multiple cylinders. The method also includes directing a first portion of exhaust gases into a first-stage turbine and a second-stage turbine of a turbocharger for expanding the exhaust gases, directing a second portion of exhaust gases from the exhaust manifold via an exhaust channel bypassing the first-stage turbine and recirculating a third portion of exhaust gases into an intake manifold after mixing with fresh air. The method includes controlling at least one of: reducing a normal engine speed at each engine power setting while maintaining constant engine power level by increasing a fuel injection per cycle; concurrently increasing a flow rate of the third portion of exhaust gas during recirculation; and advancing a fuel injection timing for reducing emission levels that meets Tier 4 requirements.

主权项

1. A method of operating an internal combustion engine, the method comprising:
combusting a mixture of a flow of fresh air and a fuel within a plurality of cylinders, wherein the fuel is injected from a fuel injection system into the plurality of cylinders; directing a first portion of exhaust gases from an exhaust manifold into a first-stage turbine and a second-stage turbine of a turbocharger for expanding the first portion of the exhaust gases; recirculating a second portion of exhaust gases from the exhaust manifold into an intake manifold after mixing with the flow of fresh air and controlling at least one of:
reducing an engine speed while operating the internal combustion engine with high brake mean effective pressure at a given engine power while further maintaining constant engine power level by increasing a fuel injection per cycle for increasing torque;concurrently increasing a flow rate of the second portion of exhaust gas during recirculation; andadvancing a fuel injection timing for reducing nitrogen oxide (NOx) and particulate matter (PM) emission levels that meets emissions regulation.