Exhaust gas purification device comprises nitrogen oxides adsorption catalyst arranged in exhaust gas channel of engine and control unit

摘要

The exhaust gas purification device comprises a NOx adsorption catalyst arranged in the exhaust gas channel of the engine and a control unit which estimates the NOx purification rate based on the NOx amount exiting the engine and the operational state of the engine and carrying out reduction of NOx adsorbed on the catalyst when the NOx purification rate falls below a predetermined value. An Independent claim is also included for a control device for the exhaust gas purification of an IC engine.