Patent ID: 9702308
Date: 2017-07-11
CPC Classifications: F02D,F02M,Y02T

Claim:
1. A diesel engine, comprising: an engine speed sensor that measures a rotation speed of the diesel engine; an exhaust gas recirculation device that recirculates an exhaust gas emitted from the diesel engine to an intake side of the diesel engine; an intake air amount sensor that measures an intake air amount of the diesel engine; a NOx measurement sensor that measures NOx contained in the exhaust gas emitted from the diesel engine; and a control device that obtains a correction value for correcting a measured value by the intake air amount sensor based on a difference between (1) first information on NOx obtained based on information on a rotation speed of the diesel engine measured by the engine speed sensor and information on a load and (2) second information on NOx measured by the NOx measurement sensor to control the exhaust gas recirculation device based on the measured value by the intake air amount sensor corrected using the correction value, wherein the control device includes a storage unit that stores a correction map in which a correlation between the measured value and a map correction value is described, the control device determines a correction coefficient based on the map correction value and the correction value, and sets the correction coefficient as a new correction value, the control device corrects the measured value by the new correction value and outputs a corrected measured value corrected by the new correction value, the control device controls the exhaust gas recirculation device based on the corrected measured value, and the control device replaces the map correction value corresponding to the measured value corrected by the correction coefficient at a timing when the difference between the first information and the second information is equal to or less than a predetermined value, by the correction coefficient at the timing when the difference between the first information and the second information is equal to or less than the predetermined value.