Air-fuel ratio control system for internal combustion engines
    7.
    发明授权
    Air-fuel ratio control system for internal combustion engines 失效
    内燃机空燃比控制系统

    公开(公告)号:US5655363A

    公开(公告)日:1997-08-12

    申请号:US562367

    申请日:1995-11-22

    摘要: An air-fuel ratio control system for an internal combustion engine having a catalyst arranged in the exhaust system, for purifying exhaust gases emitted from the engine. Upstream and downstream air-fuel ratio sensors arranged in the exhaust system at respective locations upstream and downstream of the catalyst detect the concentration of a specific component present in the exhaust gases. An ECU controls the air-fuel ratio of an air-fuel mixture supplied to the engine, in response to the outputs from the upstream and downstream air-fuel ratio sensors. The ECU detects deterioration of the catalyst caused by sulfur poisoning, based on at least the output from the downstream air-fuel ratio sensor.

    摘要翻译: 一种用于内燃机的空燃比控制系统,其具有布置在排气系统中的用于净化从发动机排出的废气的催化剂。 在催化剂的上游和下游的各个位置处布置在排气系统中的上游和下游空燃比传感器检测存在于废气中的特定成分的浓度。 响应于上游和下游空燃比传感器的输出,ECU控制供给发动机的空气燃料混合物的空燃比。 至少基于下游空燃比传感器的输出,ECU检测由硫中毒引起的催化剂的劣化。