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(11) | EP 3 128 158 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
Note: Bibliography reflects the latest situation |
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(54) | METHOD TO CONTROL A LOW-PRESSURE EXHAUST GAS RECIRCULATION EGR CIRCUIT IN AN INTERNAL COMBUSTION ENGINE |
(57) A method to determine the mass flow rate of a low-pressure exhaust gas recirculation
EGR circuit (EGRLP) of an internal combustion engine (1) comprising a first linear sensor (30) to measure
the quantity of oxygen available in the mixture of fresh air taken in and exhaust
gases flowing through the intake pipe (6) and a second linear sensor (25) to measure
the quantity of oxygen available in the flow of exhaust gases; the method comprises
the steps of determining a control current (I) of the first sensor (30) and a control
current (I) of the second sensor (25); in case the flow of exhaust gases in rich in
fuel, updating the control current (I) of the first sensor (30) as a function of the
control current (I) of the second sensor (25); and determining the mass flow rate
of a low-pressure exhaust gas recirculation EGR circuit (EGRLP) as a function of the control current (I) of the first sensor (30) and a control
current (I).
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