US 9,810,124 B2
Exhaust gas purification system of internal combustion engine
Hiroyoshi Ueda, Susono (JP)
Assigned to Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi (JP)
Appl. No. 14/781,722
Filed by Hiroyoshi Ueda, Susono (JP)
PCT Filed Apr. 5, 2013, PCT No. PCT/JP2013/060512
§ 371(c)(1), (2) Date Oct. 1, 2015,
PCT Pub. No. WO2014/162597, PCT Pub. Date Oct. 9, 2014.
Prior Publication US 2017/0089242 A1, Mar. 30, 2017
Int. Cl. F01N 3/20 (2006.01); F01N 9/00 (2006.01); B01D 53/94 (2006.01); F01N 3/10 (2006.01); F01N 3/035 (2006.01); F01N 3/025 (2006.01); F01N 13/00 (2010.01); F01N 11/00 (2006.01)
CPC F01N 3/208 (2013.01) [B01D 53/9431 (2013.01); B01D 53/9495 (2013.01); F01N 3/0253 (2013.01); F01N 3/035 (2013.01); F01N 3/103 (2013.01); F01N 9/00 (2013.01); F01N 11/002 (2013.01); F01N 13/009 (2014.06); F01N 2550/02 (2013.01); F01N 2550/04 (2013.01); F01N 2610/02 (2013.01); F01N 2610/03 (2013.01); F01N 2900/1618 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An exhaust gas purification system of an internal combustion engine, comprising:
an oxidation catalyst that is provided in an exhaust passage of the internal combustion engine and has an oxidizing function;
a fuel supplying unit that supplies a fuel component to the oxidation catalyst via exhaust gas flowing into the oxidation catalyst;
an exhaust gas purifying unit that is provided in the exhaust passage on a downstream side of the oxidation catalyst and is formed so as to include a filter which collects particulate matter in the exhaust gas, and a selective reduction-type NOx catalyst which selectively reduces NOx in the exhaust gas using ammonia as a reducing agent;
a reducing agent supplying unit that supplies ammonia or an ammonia precursor to the exhaust gas purifying unit via exhaust gas flowing into the exhaust gas purifying unit; and
an electronic control unit including a control program stored in the electronic control unit, such that upon execution of the control program by the electronic control unit, the electronic control unit is configured such that when a prescribed condition under which a part of the fuel component supplied by the fuel supplying unit passes through to the downstream side of the oxidation catalyst is satisfied, the electronic control unit controls the supply amount of ammonia or the ammonia precursor to be increased as compared to a non-passing time supply amount that is a supply amount of ammonia or the ammonia precursor to be supplied by the reducing agent supplying unit when the prescribed condition is not satisfied, and the electronic control unit is configured to control at least one of supply of the fuel component to be supplied by the fuel supplying unit and supply of the increased ammonia or ammonia precursor such that ammonia for NOx selective reduction by the increased ammonia or ammonia precursor reaches the exhaust gas purifying unit before the fuel component.