Abstract:
Systems, methods, and apparatus include determining an exhaust gas recirculation (EGR) flow rate. An effective flow area of an EGR system is determined based on a position of an EGR control valve of the EGR system and a pressure differential between an exhaust manifold pressure (EMP) and an intake manifold pressure (IMP) of an internal combustion engine. In response to the effective flow area, the pressure differential between the EMP and the IMP, the EMP, the IMP, and an exhaust manifold temperature the EGR flow rate is determined and a fraction of EGR flow in the charge flow is adjusted in response to the EGR flow rate.
Abstract:
An apparatus includes an engine module, an in-cylinder content module, and an engine out NOx module. The engine module is structured to interpret engine in-cylinder data regarding an operating condition within a cylinder of an engine, wherein the engine in-cylinder data includes an engine torque, an engine speed, a rail pressure, and a start-of-injection. The in-cylinder content module is structured to interpret at least one additional in-cylinder data point regarding the operating condition within the cylinder of the engine. The engine out NOx module is structured to determine an engine out NOx amount responsive to the engine in-cylinder data and the at least one additional in-cylinder data point.