EP 1061245 A2 20001220 - Exhaust gas purifying system of internal combustion engine
Title (en)
Exhaust gas purifying system of internal combustion engine
Title (de)
Abgasreinigungssystem für eine Brennkraftmaschine
Title (fr)
Système de purification de gaz d'échappement d'un moteur à combustion interne
Publication
Application
Priority
JP 16670199 A 19990614
Abstract (en)
A catalyst is installed in an exhaust passage of an internal combustion engine. The catalyst is of a type that traps and stores NOx in the exhaust gas when the air/fuel ratio of the exhaust gas is higher than the stoichiometric ratio and reduces the stored NOx with the aid of reducing components in the exhaust gas when the air/fuel ratio of the exhaust gas is equal to or lower than the stoichiometric ratio. A detector detects operation load of the engine. A control unit includes a microprocessor that is programmed to carry out calculating the amount of the stored NOx when the air/fuel ratio of the exhaust gas is higher than the stoichiometric ratio; judging whether or not the catalyst needs recovering of the NOx-storing ability thereof in accordance with the calculated amount of the stored NOx; determining the amount of NOx to be reduced in accordance with the engine load detected by the detector; and carrying out a catalyst recovering control when the need of recovering the NOx-storing ability is judged. The catalyst recovering control is a control to keep the air/fuel ratio of the exhaust gas at a predetermined lower ratio for a predetermined period. <IMAGE>
IPC 1-7
IPC 8 full level
F01N 3/08 (2006.01); F01N 3/20 (2006.01); F01N 3/24 (2006.01); F01N 3/28 (2006.01); F02D 41/02 (2006.01); F02D 41/04 (2006.01)
CPC (source: EP)
F01N 3/0842 (2013.01); F02D 41/0275 (2013.01); F02D 2200/0806 (2013.01); F02D 2200/0811 (2013.01)
Citation (applicant)
- JP H0610725 A 19940118 - TOYOTA MOTOR CORP
- JP H06294319 A 19941021 - TOYOTA MOTOR CORP
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1061245 A2 20001220; EP 1061245 A3 20011128; EP 1061245 B1 20030917; DE 60005251 D1 20031023; DE 60005251 T2 20040408; JP 2000356124 A 20001226; JP 3812223 B2 20060823
DOCDB simple family (application)
EP 00112088 A 20000605; DE 60005251 T 20000605; JP 16670199 A 19990614