NOx SENSOR DIAGNOSTIC DEVICE FOR INTERNAL COMBUSTION ENGINE
AssigneeDenso Corporation
InventorMakoto MIWA
Life of this patent
Estimating the term…
Abstract
A NOx sensor diagnostic device for an internal combustion engine includes a NOx sensor disposed in the exhaust passage of the engine, through which exhaust air discharged from the engine flows, and configured to detect nitrogen oxide included in the exhaust air, an air supply device for supplying air to the exhaust passage, and a sensor determination device for making the NOx sensor detect nitrogen oxide in the exhaust passage, to which air is supplied by the air supply device while the engine is stopped, and for determining that the NOx sensor is abnormal when an output value of the NOx sensor is equal to or larger than a predetermined reference value.
Claims4
A NOx sensor diagnostic device for an internal combustion engine having an exhaust passage, the device comprising:
- a NOx sensor disposed in the exhaust passage, through which exhaust air discharged from the engine flows, and configured to detect nitrogen oxide included in the exhaust air;
- an air supply means for supplying air to the exhaust passage;
- and
- a sensor determination means for making the NOx sensor detect nitrogen oxide in the exhaust passage, to which air is supplied by the air supply means while the engine is stopped, and for determining that the NOx sensor is abnormal when an output value of the NOx sensor is equal to or larger than a predetermined reference value.
Dependencies are inferred from the claim text.