A system for generating charge current and exhaust gas recirculation rate control commands based on engine operating conditions

摘要

A system for generating a boost flow control command and an exhaust gas recirculation fraction control command for an air ducting system of an internal combustion engine, the system comprising: a storage unit having a number of boost flow data sets and exhaust gas recirculation fraction data sets stored therein, means (80) for determining an ambient air density, means (90) for determining an engine operating temperature, means (76) for determining an engine speed, a control unit for generating reference information containing an upper engine operating status table value (CHI-UT) and a lower engine operating status table value (CHI-LT) as a function of an emission peak level value and one of the ambient air density and the engine operating temperature, a charging current determining unit for selecting two of the number of charging current records based on the upper and lower engine operating status table values (CHI-UT, CHI-LT) for determination Men a supercharging current control command value from each of the two supercharging current data sets as a function of the engine speed and engine fueling, and for determining the supercharging current control command as a function of the determined supercharging current control command values, and an exhaust gas recirculation rate determination unit for selecting two of the number of exhaust gas recirculation rate data sets based on the upper and lower engine operating status table values (CHI-UT, CHI-LT) for determining an exhaust gas recirculation fraction control command value from each of the two exhaust gas recirculation fraction data sets as a function of the engine speed and the engine fuel supply, and for determining the exhaust gas recirculation fraction control command as a function of the determined exhaust gas recirculation fraction control command values .