Intake air amount estimation device and intake air amount estimation method

摘要

The intake air amount estimation device uses a throttle valve passing air amount based on a throttle valve upstream / downstream pressure ratio, which is a ratio of a pressure upstream of the throttle valve and a pressure downstream of the throttle valve, and an opening area of the throttle valve. And a throttle valve passage air amount calculation means for calculating the intake air amount of the internal combustion engine based on the throttle valve passage air amount. Furthermore, the intake air amount estimation device includes a correction unit that calculates the actual cylinder volume based on the intake valve closing timing and corrects the throttle valve passing air amount according to the actual cylinder volume.