Patent ID: 8904756
Filing Date: 2014-12-09
Classification: F01N,Y02T

Abstract:
1. An exhaust emission control system of an internal combustion engine, comprising: a bypass passage provided in an exhaust passage of the internal combustion engine and arranged to bypass a main passage that is a part of the exhaust passage; a NOx adsorbent provided in the bypass passage and adapted to adsorb at least NOx from among components contained in exhaust gas; a channel switching device that switches a channel of the exhaust gas between the main passage and the bypass passage; a first temperature sensor that detects a temperature of a portion of the NOx absorbent which is located on an upstream side as viewed in a direction in which the exhaust gas flows, as an upstream-side temperature; a second temperature sensor that detects a temperature of a portion of the NOx adsorbent which is located on a downstream side as viewed in the direction in which the exhaust gas flows, as a downstream-side temperature; and an electronic control unit programmed to;