首页>
外国专利>
Reducing agent addition error detection method and reducing agent addition error detection device for exhaust purification catalyst
Reducing agent addition error detection method and reducing agent addition error detection device for exhaust purification catalyst
展开▼
机译:排气净化催化剂的还原剂添加错误检测方法及还原剂添加错误检测装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
When a reducing agent is supplied from a supply valve into an exhaust port, an air-fuel ratio detected by an air-fuel ratio sensor becomes lower than an air-fuel ratio generated by fuel injected from a fuel injection valve into a combustion chamber. An estimated supply amount is obtained by periodically accumulating a reducing agent supply amount corresponding value which appears in the change in the air-fuel ratio, in step S186. Accordingly, the estimated supply amount can be obtained with high accuracy. Then, by comparing the estimated supply amount with a determination value in step S190, a supply error can be detected with high accuracy. As a result, an abnormal determination in step S194/a normal determination in step S196 concerning the supply valve can be performed accurately. IMAGE IMAGE
展开▼