{
  "$type": "site.standard.document",
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  "description": "A HC adsorption type three-way catalytic converter (13) is arranged in an exhaust gas passage of a diesel engine (1) at a position upstream of an exhaust gas purifying device (15,14) constituted of at least one of a diesel particulate filter (15) and a NOx trapping catalytic converter (14). Upon…",
  "path": "/patents/1092747",
  "publishedAt": "2003-10-08T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N13/009",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "A HC adsorption type three-way catalytic converter (13) is arranged in an exhaust gas passage of a diesel engine (1) at a position upstream of an exhaust gas purifying device (15,14) constituted of at least one of a diesel particulate filter (15) and a NOx trapping catalytic converter (14). Upon need of reactivation of the diesel particulate filter (15) or NOx trapping catalytic converter (14) under cold operation of the engine, a control unit (20) carries out lowering an excess air ratio of the exhaust gas of the engine when the temperature of the catalyst bed of the three-way catalytic converter (13) is lower than or equal to a first predetermined temperature (#TBED1) (viz.,oxidization activation temperature); raising the excess air ratio of the exhaust gas when the temperature of the catalyst bed of the three-way catalytic converter (13) is higher than the first predetermined temperature (#TBED1) but lower than or equal to a second predetermined temperature (#TBED2) (viz.,three-way catalyst activation temperature); and lowering the excess air ratio of the exhaust gas until the temperature of the exhaust gas purifying device (15,14) becomes to a third predetermined temperature (#TBED3) (viz.,reactivation assuring temperature) when the temperature of the catalyst bed of the three-way catalytic converter (13) is higher than the second predetermined temperature (#TBED2). A HC adsorption type three-way catalytic converter (13) is arranged in an exhaust gas passage of a diesel engine (1) at a position upstream of an exhaust gas purifying device (15,14) constituted of at least one of a diesel particulate filter (15) and a NOx trapping catalytic converter (14). Upon need of reactivation of the diesel particulate filter (15) or NOx trapping catalytic converter (14) under cold operation of the engine, a control unit (20) carries out lowering an excess air ratio of the exhaust gas of the engine when the temperature of the catalyst bed of the three-way catalytic converter (13) is lower than or equal to a first predetermined temperature (#TBED1) (viz.,oxidization activation temperature); raising the excess air ratio of the exhaust gas when the temperature of the catalyst bed of the three-way catalytic converter (13) is higher than the first predetermined temperature (#TBED1) but lower than or equal to a second predetermined temperature (#TBED2) (viz.,three-way catalyst activation temperature); and lowering the excess air ratio of the exhaust gas until the temperature of the exhaust gas purifying device (15,14) becomes to a third predetermined temperature (#TBED3) (viz.,reactivation assuring temperature) when the temperature of the catalyst bed of the three-way catalytic converter (13) is higher than the second predetermined temperature (#TBED2).",
  "title": "Exhaust emission control system of a diesel engine and method therefore"
}