Patent ID: 7715993

Claim:
A method of estimating pumping torque of an internal combustion engine for a motor vehicle including fuel injection controlled by an electronic computer, the method comprising: determining the pumping torque in a form of a relative pumping torque CMI bp — rel representative of a contribution to total pumping torque of intake and exhaust valving devices, the relative pumping torque CMI bp — rel being determined by: CMI bp ⁢ _ ⁢ rel = Δ ⁢ ⁢ V × Δ ⁢ ⁢ P rel 4 ⁢ ⁢ π in which ΔV is swept volume of the engine, and a pressure difference ΔP rel is equal to the sum of ΔP ech and ΔP adm , ΔP ech being an estimate of the exhaust pressure differential due to presence of the exhaust valving device and ΔP adm being an estimate of the intake pressure differential due to presence of the intake valving device.