Exhaust gas purification apparatus and method for controlling the same
AssigneesHyundai Motor Company, Kia Motors Corporation, Hyundai Kefico Corporation
InventorsJin Woo Choung, SooMin Lee, SungJae Kim
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Abstract
A method for controlling an exhaust gas purification apparatus according to an exemplary embodiment of the present invention is to improve performance of a three-way catalyst (TWC) purifying exhaust gas exhausted from an engine and includes determining heat load of the three-way catalyst by use of a temperature sensor and an exhaust gas flow rate sensor; measuring oxygen storage capacity (OSC) stored in the three-way catalyst according to the heat load; determining an inflection point by use of change amount of the OSC; and controlling catalyst heating period differently around the inflection point.
Claims9
A method for controlling an exhaust gas purification apparatus to improve performance of a three-ways catalyst (TWC) purifying exhaust gas exhausted from an engine, comprising:
- determining heat load of the three-way catalyst by use of a temperature sensor and an exhaust gas flow rate sensor;
- measuring oxygen storage capacity (OSC) stored in the three-way catalyst according to the heat load;
- determining an inflection point by use of a change amount of the OSC;
- and
- controlling a catalyst heating period differently around the inflection point.
An exhaust gas purification apparatus provided to purify exhaust gas of an engine, comprising:
- a three-way catalyst (TWC) disposed at an exhaust line which exhaust gas exhausted from the engine is configured to pass and changing harmful material including carbon monoxide, hydrocarbon and nitrogen oxide included in the exhaust gas to harmless components;
- an oxygen sensor configured for measuring an oxygen storage capacity (OSC) stored in the three-way catalyst;
- and
- a controller configured for determining heat load of the three-way catalyst and controlling catalyst heating period by use of change amount of the OSC according to the heat load,
- wherein the controller is configured to determine an inflection point in which decreasing rate of the change amount is changed and controls catalyst heating period differently around the inflection point.
Dependencies are inferred from the claim text.