| 摘要 |
PROBLEM TO BE SOLVED: To identify an abnormality in an intercooler outlet temperature sensor, an intake manifold temperature sensor, an EGR outlet temperature sensor, an intercooler and an EGR cooler.SOLUTION: With the confirmation of normal detection of the intake air temperature at an inlet of an intercooler 6, the outside air temperature, the EGR gas temperature at an inlet of an EGR cooler 14, and the temperature of cooling water entering the EGR cooler 14, as a precondition, the location of an abnormality in an air intake system is identified by comparing three elements: the intercooler efficiency, calculated on the basis of the intake air temperature at the inlet of the intercooler 6, the intake air temperature at the outlet of the intercooler 6, and the outside air temperature; the EGR cooler efficiency, calculated on the basis of the EGR gas temperature at the inlet of the EGR cooler 14, the EGR gas temperature at the outlet of the EGR cooler 14, and the cooling water temperature; and the deviation of the calculated value for the intake air temperature of an intake manifold 7 with respect to the actual measured value, the calculated value being calculated on the basis of the current EGR rate, the EGR gas temperature at the outlet of the EGR cooler 14, and the intake air temperature at the outlet of the intercooler 6. |
