Apparatus and method for controlling low-pressure exhaust gas recirculation system for freezing prevention

An apparatus for controlling an LP-EGR system for freezing prevention, the apparatus comprising:

• an intake air temperature sensor configured to measure a temperature of intake air introduced from outside;
• at least one engine driving sensor used to diagnose and learn a driving state of an engine;
• the LP-EGR system configured such that at least a portion of exhaust gas flows into the LP-EGR system as intake air;
• and
• a controller configured to perform diagnosis and learning of the driving state of the engine using the at least one engine driving sensor or to operate the LP-EGR system depending on the temperature of the intake air measured by the intake air temperature sensor when coasting conditions of a vehicle are satisfied,
• wherein the controller performs the diagnosis and learning of the driving state of the engine using the at least one engine driving sensor when the intake air temperature is less than or equal to a first reference value and greater than a second reference value, and operates the LP-EGR system in a state in which the diagnosis and learning of the driving state of the engine through the engine driving sensors have been completed, and
• wherein the controller operates the LP-EGR system without diagnosis and learning of a driving state of an engine when the intake air temperature measured by the intake air temperature sensor is less than or equal to the second reference value.