Patent ID: 7281518
Filing Date: 2007-10-16
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method to improve transient emission control in an electronically controlled heavy duty diesel engine equipped with a fuel system and an air system having an EGR, and a memory within an Engine Control Module (ECM) comprising: determining a required transient air fuel ratio; determining a difference in air fuel ratio (setpoint minus actual), determining a change in EGR setpoint (ΔEGR) to compensate for air system response; determining a transient EGR setpoint; determining a final EGR setpoint; determining a required transient fuel system pressure setpoint; determining a difference in fuel system pressure (setpoint minus actual), determining a change in beginning of injection (ΔBOI); determining a transient beginning of injection setpoint; determining a final beginning of injection setpoint; implementing the final EGR setpoint to compensate for the air system reaction time during transient engine operation and implementing the final BOI to compensate for the fuel system reaction times during transient engine operation to improve engine operation and reduce emissions.