Mitsubishi Fuso Truck & Bus Corporation

Nissan Diesel Motor Co., Ltd.

Reiko Doumeki

Satoshi Hiranuma

Yoshinaka Takeda

Toru Kawatani

Shinichi Saito

Yoshinori Takahashi

Kenji Kawai

Takeshi Hashizume

Ritsuko Shinozaki

Yasuko Suzuki

Shinichi Saitou

Ristuko Shinozaki

An exhaust gas purification device comprises a NOx catalyst for purifying NOx contained in exhaust gas by using ammonia as a reducing agent, an ammonia supply device for supplying ammonia to the NOx catalyst, a catalyst temperature sensor for detecting the internal temperature of the NOx catalyst, and a control unit that stops the ammonia supply from the ammonia supply device when the stop condition is satisfied that the internal temperature of the NOx catalyst becomes equal to or higher than first prescribed temperature in the process where ammonia is supplied from the ammonia supply device to the NOx catalyst.

Exhaust gas purification device

An exhaust gas purifying system reliably detects an amount of accumulated particulates, lengthens forced regeneration intervals, and improves fuel efficiency. The exhaust gas purifying system comprises: a particulate filterdisposed in an exhaust system of an internal combustion engineand collecting particulates from exhaust gas, and an NOgenerating unitupstream of or in the particulate filter; a discharged particulate amount calculating unit Acalculates an amount Me of discharged particulates on the basis of an excess air ratio &#x3bb;; a burnt particulate amount calculating unit Acalculates an amount Mb of burnt particulates on the basis of the temperature of exhaust gas in front of the particulate filter or the temperature of the particulate filter; and a particulate accumulation amount calculating unit calculates an amount Ma of accumulated particulates on the basis of the amount Me of discharged particulates or the amount Mb of burnt particulates.

Exhaust emission control device of internal combustion engine

In regenerating a filter there are performed a first additional fuel injection involving additional injection of fuel into a cylinder after a main fuel injection in an engine to raise the temperature of an oxidation catalyst and a second additional fuel injection involving fuel injection after the first additional fuel injection to supply the oxidation catalyst with the fuel, a second additional fuel injection quantity is set in accordance with an engine speed and an engine load and is changed in accordance with an outlet temperature of the oxidation catalyst.

Exhaust gas purifying system and exhaust gas purifying method

A NOx catalyst for selectively reducing NOx in exhaust gas by adsorbing ammonia is provided at an exhaust system of an engine, ammonia or urea water is supplied to the NOx catalyst by reducing agent supplying means, a consumption amount of ammonia adsorbed to the NOx catalyst is derived by consumption amount deriving means based on an exhaust amount of NOx exhausted from the engine detected or estimated by NOx exhaust amount deriving means and an actual NOx cleaning rate by the NOx catalyst derived by actual NOx cleaning rate deriving means, an actual adsorption amount of ammonia adsorbed to the NOx catalyst is derived in accordance with an addition amount of ammonia and the consumption amount of ammonia by adsorption amount deriving means and the reducing agent supplying means is controlled by controlling means in accordance with the actual adsorption amount.

NOx cleaning apparatus and NOx cleaning method for internal combustion engine

Growing community of inventors

Tokyo, Japan

Reiko Doumeki