Abstract: In a fuel pressure control device for an internal combustion engine of the invention, a first map (FIG. 4A) for defining a first target fuel pressure for normal time and a second map (FIG. 5A) for defining a second target fuel pressure for suppressing noise and vibration smaller than the first target fuel pressure are stored. When an acquired fuel temperature is higher than a predetermined temperature, the first target fuel pressure defined in the first map is set as a target fuel pressure (steps 1 to 3), and when the fuel temperature is equal to or lower than the predetermined temperature, the second target fuel pressure defined in the second map is set as the target fuel pressure (steps 1, 5, and 6). The fuel pressure is controlled based on the set target fuel pressure (step 7).

Abstract: An exhaust emission control device for an internal combustion engine, which is capable of terminating reduction control in proper timing when a NOx cleaning catalyst includes an auxiliary catalyst having an oxygen storage capacity, thereby making it possible to reduce exhaust emissions and improve fuel economy. The exhaust emission control device includes the NOx cleaning catalyst and an ECU. The NOx cleaning catalyst includes the auxiliary catalyst having an oxygen storage capacity. The ECU executes reduction control when predetermined conditions for executing the reduction control are satisfied. During execution of the reduction control, when exhaust gas temperature is higher than a predetermined value, if a second excess air ratio is lower than a predetermined value, the ECU determines that the reduction control should be terminated.

Abstract: An exhaust emission control device for an internal combustion engine, which is capable of terminating reduction control in proper timing when a NOx cleaning catalyst includes an auxiliary catalyst having an oxygen storage capacity, thereby making it possible to reduce exhaust emissions and improve fuel economy. The exhaust emission control device includes the NOx cleaning catalyst and an ECU. The NOx cleaning catalyst includes the auxiliary catalyst having an oxygen storage capacity. The ECU executes reduction control when predetermined conditions for executing the reduction control are satisfied. During execution of the reduction control, when exhaust gas temperature is higher than a predetermined value, if a second excess air ratio is lower than a predetermined value, the ECU determines that the reduction control should be terminated.