Exhaust gas recirculation control to reduce condensation

摘要

A control and method for an internal combustion engine that includes an exhaust gas recirculation system. The control predicts 124 an intake manifold critical temperature (dew point) at which condensation would occur when using exhaust gas recirculation 130. The control calculates the intake manifold critical temperature as a function of predetermined, sensed or assumed values by substituting the values as variables in an equation. The control commands adjustments of exhaust gas recirculation operation in response 128 to the calculation. Exhaust gas recirculation may be switched on if the intake manifold temperature is greater than the intake manifold critical temperature. The intake manifold critical temperature may be defined as a linear function of the variables.