发明名称 |
Exhaust emission control for engine |
摘要 |
An engine exhaust emission control arrangement has a catalytic converter including a three-way catalyst. A first oxygen sensor detects an oxygen concentration of exhaust gas upstream of the catalyst and a second oxygen sensor detects an oxygen concentration of exhaust gas downstream of the catalyst. A microprocessor calculates a specific period oxygen storage amount of a catalyst while the upstream oxygen concentration is higher than the stoichiometric concentration and the downstream oxygen concentration is in a predetermined concentration range which has a value approximately equal to the stoichiometric oxygen concentration. The microprocessor also calculates a specific period oxygen release amount of a catalyst while the upstream oxygen concentration is lower than the stoichiometric concentration and the downstream oxygen concentration produces an indication of a predetermined concentration range. A specific period oxygen storage amount is sampled at a time at which the downstream oxygen concentration becomes greater than the predetermined concentration range as a maximum oxygen storage amount and a specific period oxygen release amount is sampled at a time at which the downstream oxygen concentration becomes smaller than the predetermined concentration range as a maximum oxygen release amount. The engine air-fuel ratio is controlled to cause the oxygen storage amount of the catalyst to coincide with a target value which is set at approximately half of an average value of the maximum oxygen storage amount and the maximum oxygen release amount.
|
申请公布号 |
US2002157379(A1) |
申请公布日期 |
2002.10.31 |
申请号 |
US20010958842 |
申请日期 |
2001.10.15 |
申请人 |
KAKUYAMA MASATOMO;KAKIZAKI SHIGEAKI;MATSUNO OSAMU |
发明人 |
KAKUYAMA MASATOMO;KAKIZAKI SHIGEAKI;MATSUNO OSAMU |
分类号 |
F02D45/00;B01D53/94;F01N3/10;F01N3/24;F01N11/00;F02D41/02;F02D41/14;(IPC1-7):F01N3/00;F01N7/00 |
主分类号 |
F02D45/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|