PCV (POSITIVE CRANKCASE VENTILATION) FLOW ESTIMATION METHODS AND SYSTEMS BY THE OXYGEN SENSOR AT INLET Russian patent published in 2018 - IPC F02D21/08 F02D41/14 F02M25/08 F02M26/02 F01M13/00 

FIELD: engine building.

SUBSTANCE: invention can be used in the internal combustion engines. Operation method is implemented in the internal combustion engine (10) with a turbocharger, including at least one turbocharger, intake manifold, the intake gases oxygen sensor, the EGR valve, located in the EGR (exhaust gas recirculation) channel, and the fuel system tank. Method consists in the fact that locating the intake gases oxygen sensor downstream of at least one turbocharger and upstream of the intake manifold in the engine flow path. Measuring the oxygen content in the flow path by means of the intake gases oxygen sensor. Evaluating the PCV (positive crankcase ventilation) output flow. Operating the engine with supercharging and without supercharging. Determining the PCV output flow with the EGR flow in the EGR channel and the fuel system tank purging, deactivated on the basis of the suction gases oxygen sensor at least one output signal during the engine operation. Directing the PCV output flow to the position in the motor flow path, which is located downstream of the suction gases oxygen sensor, which then flows into the engine intake manifold during the engine supercharged operation. Directing the PCV output flow to the position in the motor flow path, which is located downstream of the suction gases oxygen sensor, which then flows into the engine intake manifold during the engine operation without supercharging. Adjusting the EGR valve based on the measured using the suction gases oxygen sensor oxygen content, evaluated PCV flow output and flowing through the EGR channel exhaust gas. Disclosed are the engine operation method variant and the engine system.

EFFECT: technical result consists in increase in the EGR flow rate estimates accuracy, in improvement in the EGR system control and in the engine emissions maintenance at target levels.

12 cl, 6 dwg