Abstract: An air amount calculation device is configured to receive a detection signal from an air amount sensor provided in an intake air passage of an engine and to calculate an air amount of air flowing through the intake air passage based on the detection signal. The air amount calculation device includes: an acquisition unit configured to acquire an air amount calculation parameter using a detection point within an intermediate range intermediate between a maximum value and a minimum value in the detection signal; and an air amount calculation unit configured to calculate the air amount based on the air amount calculation parameter.

Abstract: An oscillation control apparatus is applied to a vehicle having a drive train for traveling on a road surface. The drive train includes a power source for generating torque transmitted to wheels via a shaft. The oscillation control apparatus includes a perfect reference model of the drive train. The perfect reference model inputs the torque, which is generated suing the power source, and road load, which is resistance force applied to the vehicle. The perfect reference model outputs revolution speed of the power source. The perfect reference model includes a perfect reference-speed calculating unit for calculating perfect reference speed of the power source under an assumption that the shaft is free from torsion therein. The perfect reference model further includes a power controlling unit for controlling the torque on the basis of the perfect reference speed.