Patent ID: 7966815

Claim:
A method of determining a change in air mass at an inlet manifold of a supercharged internal combustion engine comprising: measuring airflow upstream of a throttle valve that is upstream of a supercharger; subtracting, using a processing unit having one or more computer processors, from the measured airflow, a value representative of a change in the air mass between the throttle valve and the supercharger based on a change in pressure between the throttle valve and the supercharger; and subtracting, using the processing unit, from the measured airflow, a modification value dependent upon a current engine speed and a signal representative of a pressure at the inlet manifold; wherein the value representative of a change in the air mass between the throttle valve and the supercharger is computed as: dP 1 *(V 1 /RT 1 ), where dP 1 is the change in pressure between the throttle value and the supercharger, V 1 is the volume at the throttle, R is a gas constant for air, and T 1 is a temperature at the throttle wherein the modification value is computed as: ne*KdT*P 2 , where ne is a measured engine speed, K represents a number defining a change in manifold pressure load; and P 2 is a pressure at the inlet manifold.