Patent ID: 8910476

Claim:
An exhaust gas condensate control method for controlling condensation in an Exhaust Gas Recirculation (EGR) system, comprising: a step of setting a condition that sets an allowable relative humidity limit K 1 of an exhaust gas flowing in the EGR system after being discharged from an engine, and detects a current relative humidity value K 3 from an operational state of the engine and the EGR system; a step of calculating humidity factors that distributes the exhaust gas in the EGR system, selects modeling objects for calculations of an estimation factor W and removal factors Va and Vb, calculates the estimation factor W and the removal factors Va and Vb, and calculates an estimated relative humidity value K 2 of the exhaust gas flowing in the EGR system; a step of executing humidity removal that determines a desired relative humidity value K 5 for the EGR system as desired relative humidity value K 5 =+ or − from relationships of the allowable relative humidity limit Kl, the current relative humidity value K 3 , and the estimated relative humidity value K 2 , and executes by an electronic control unit (ECU) an EGR control logic to control humidity in the EGR system with an intake flow rate control if it is determined that the desired relative humidity value K 5 =+, or executes an extension logic of a feedback control if it is determined that the desired relative humidity value K 5 =−; and a step of controlling a standby mode that performs initialization to return-to the step of setting a condition when the engine stops.