Abstract: A system for detecting a leakage/failure in in an intake line of an internal combustion engine comprising an intake line (IL) and an exhaust line (EL), means (HFM) for measuring or for estimating a quantity of fresh air ({dot over (m)}HFM) entering said intake line (IL), means for measuring or for estimating a quantity of fuel ({dot over (m)}FUEL) injected in the engine (E), measurement or estimation means (? and/or NOx), on the exhaust line, adapted to provide a first value (?measured) of an air/fuel ratio introduced in the internal combustion engine (E), the system comprising processing means (ECU) adapted to calculate a second value (?exp) of said air/fuel ratio, calculated on the basis of the measured and estimated quantities of fresh air ({dot over (m)}HFM) and fuel ({dot over (m)}FUEL) to calculate an error (?err) between the first and the second value (?measured??exp) and to detect a condition of leakage/failure if said error is outside a predefined interval [?err?, ?err+] containing the value zero.

Abstract: System for controlling an EGR valve of an internal combustion engine based on a flow model, the flow model estimating an EGR flow rate outgoing from the EGR valve to control an opening/closing of said EGR valve, on the basis of operating parameters of the internal combustion engine; the method being characterized in that it models said EGR valve as a nozzle and it calculates a relative equivalent outflow area to correct said estimation of the EGR flow rate.

Abstract: A system for detecting a leakage/failure in in an intake line of an internal combustion engine comprising an intake line (IL) and an exhaust line (EL), means (HFM) for measuring or for estimating a quantity of fresh air ({dot over (m)}HFM) entering said intake line (IL), means for measuring or for estimating a quantity of fuel ({dot over (m)}FUEL) injected in the engine (E), measurement or estimation means (? and/or NOx), on the exhaust line, adapted to provide a first value (?measured) of an air/fuel ratio introduced in the internal combustion engine (E), the system comprising processing means (ECU) adapted to calculate a second value (?exp) of said air/fuel ratio, calculated on the basis of the measured and estimated quantities of fresh air ({dot over (m)}HFM) and fuel ({dot over (m)}FUEL) to calculate an error (?err) between the first and the second value (?measured??exp) and to detect a condition of leakage/failure if said error is outside a predefined interval [?err?, ?err+] containing the value zero.