Waseda University

Ud Trucks Corporation

Tokyo Roki Co., Ltd.

Mazda Motor Corporation

Cosmo Oil Co., Ltd.

Jin Kusaka

Masahisa Yamakawa

Takashi Youso

Kiminobu Hirata

Nobuhiko Masaki

Hideaki Kato

Isamu Kanaya

Takayuki Adachi

Yasumasa Notake

Keishi Takada

Takeshi Mende

Fumiyuki Tsurumi

Shigeyuki Tanaka

An engine exhaust purification device comprises: a selective reduction type NOx catalyst; an oxidation catalyst disposed on an upstream side of the NOx catalyst; a reducing agent adding device which adds an NOx reducing agent to an exhaust gas of an engine; a control device which controls the reducing agent adding device; and an NOratio calculation device which estimates an NOratio of the exhaust gas flowing into the NOx catalyst. The NOratio of the exhaust gas flowing into the NOx catalyst is calculated by a catalytic reaction model where the oxidation reaction of NO in the oxidation catalyst is numerically formulated, and the NOratio is reflected to calculate an amount of ammonia adsorbed on the NOx catalyst by a catalytic reaction model where a chemical reaction concerned with the reduction of NOx in the NOx catalyst is numerically formulated.

Engine exhaust purification device

An exhaust gas pressure P, exhaust gas temperatures Tand Ton upstream and downstream of a DPF, a rotation speed Ne, a load Q, and an intake flow rate F as various operating conditions are read, and an amount of PM generated for short time &#x394;t is obtained to be added to a PM deposited amount m, and thus, to obtain an initial deposited amount. Exhaust gas properties and a space velocity SV are obtained based on various operating conditions, and the PM deposited amount m after a lapse of the short time &#x394;t is estimated from a PM deposited amount estimation equation 'm=m&#xb7;exp(&#x2212;B&#xb7;&#x394;t)' having been derived considering the exhaust gas properties and the space velocity SV. When the PM deposited amount m is equal to or more than a predetermined value, a forced regeneration processing in the DPF is executed, and thereafter, the PM deposited amount m is reset to 0.

Apparatus for and method of purifying exhaust gas

Growing community of inventors

Tokyo, Japan

Jin Kusaka