Patent ID: 9422875
Filing Date: 2016-08-23
CPC Classification: F02B,F02D,F02M,Y02T

Claim Text:
1. A method of controlling an internal-combustion engine comprising at least one cylinder, at least one intake valve in the at least one cylinder and at least one exhaust valve for discharging burnt gas from the at least one cylinder, an external exhaust gas recirculation circuit and a variable timing means, including a first actuator of the at least one intake valve and a second actuator of the at least one exhaust valve comprising: acquiring a torque setpoint for the engine; determining a position setpoint for the first actuator and a position setpoint for the second actuator by using a burnt gas flow model which relates position setpoints of the actuators to the engine torque setpoint and includes a cylinder filling model, the burnt gas flow model characterizing burnt gas flow in the external exhaust gas recirculation circuit and through the variable timing means; and controlling a burnt gas fraction in the at least one cylinder by controlling the first and second actuators respectively with the position setpoints; and wherein the burnt gas flow model is constructed using engine maps as a function of the engine torque setpoint associated with the filling model of the at least one cylinder by