Patent ID: 6125829
Filing Date: 2000-10-03
Classification: F02B,F02D,Y02T

Abstract:
A method of controlling the exhaust gas recirculation in an internal combustion engine having an exhaust gas recirculation valve, the method which comprises:storing in a memory of a control unit setpoint values for an exhaust gas recirculation rate appropriate for steady-state operation of an internal combustion engine;determining a setpoint value for an exhaust gas recirculation rate from the memory as a function of a load variable and engine speed;deriving a control signal for controlling an exhaust gas recirculation valve from the setpoint value for the exhaust gas recirculation rate;generating in non-steady operating states of the engine a correction value in a correction element;using a transfer member with a differentiator component as the correction element, and ascertaining the correction value as a function of the load variable or of the setpoint value of the exhaust gas recirculation rate; andcorrecting the setpoint value of the exhaust gas recirculation rate with the correction value to form a corrected setpoint value appropriate for an exhaust gas recirculation in non-steady operating states of the engine by additively combining the correction value and the setpoint value of the exhaust gas recirculation rate.