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Abnormality diagnosis method of the NOx sensor, the NOx sensor abnormality diagnosis system, and NOx emissions concentration estimation method for an internal combustion engine
Abnormality diagnosis method of the NOx sensor, the NOx sensor abnormality diagnosis system, and NOx emissions concentration estimation method for an internal combustion engine
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机译:内燃机的NOx传感器的异常诊断方法,NOx传感器异常诊断系统以及NOx排放浓度估计方法
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摘要
PROBLEM TO BE SOLVED: To provide a method and system for diagnosing a fault of a NOx sensor, configured to compare a calculated NOx concentration value with a value detected by a NOx sensor to continuously diagnose a fault of the NOx sensor, and to provide an internal combustion engine.;SOLUTION: NOx concentration NOx_cyl is calculated on the basis of a value m_air detected by an intake amount sensor 31 arranged in an intake passage 12 of an internal combustion engine 10, a value Ti detected by a temperature sensor 32 arranged in an intake manifold 11a, a value Pi detected by a pressure sensor 33 arranged in the intake manifold 11a, and a value λ_egr detected by an excess air ratio sensor 34 in an exhaust passage 18. The calculated Nox concentration NOx_cyl is compared with the value NOx_m detected by the NOx sensor, to determine a fault of the NOx sensor 35 arranged in the exhaust passage 18.;COPYRIGHT: (C)2013,JPO&INPIT
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