发明名称 |
Air-fuel ratio feedback control system including at least downstream-side air-fuel ratio sensor |
摘要 |
In an air-fuel ratio feedback control system including at least one air-fuel ratio sensor downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is controlled in accordance with the output of the downstream-side air-fuel ratio sensor. When at least one of the air-fuel ratio feedback control conditions for the downstream-side air-fuel ratio sensor is not satisfied the controlled air-fuel ratio is made an air-fuel ratio by an open loop control, while all the air-fuel ratio feedback control conditions for the downstream-side air-fuel ration sensor are satisfied the controlled air-fuel ratio is made the stoichiometric ratio ( lambda =1) in accordance with the output of the downstream-side air-fuel ratio sensor. For a period after all the air-fuel ratio feedback control conditions for the downstream-side air-fuel ratio sensor are satisfied, the control by the output of the downstream-side air-fuel ratio sensor is prohibited, but, the controlled air-fuel ratio is made the stoichiometric ratio ( lambda =1) by an open loop control or by the output of an upstream-side air-fuel ratio sensor. |
申请公布号 |
US4964271(A) |
申请公布日期 |
1990.10.23 |
申请号 |
US19880163871 |
申请日期 |
1988.03.03 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
SAWADA, HIROSHI;UEDA, TATEHITO;NAKANISHI, KIYOSHI;DEMURA, TAKAYUKI |
分类号 |
F02D41/14 |
主分类号 |
F02D41/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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