Institut Francais Du Pe'trole

Ifp Energies Nouvelles

Jonathan Chauvin

Pierre Rouchon

Nicolas Petit

Gilles Corde

Philippe Moulin

Olivier Grondin

Thomas Leroy

Yohan Bentolina

The invention is a method of controlling the combustion of a diesel engine comprising determining setpoint values for physical parameters linked with the intake of gaseous oxidizer in the combustion chamber, and a setpoint value &#x3b8;for the crank angle at which fuel has to be injected into the combustion chamber. While the engine control system controls actuators in such a way that the values of the physical parameters are equal to the setpoint values, setpoint value &#x3b8;is corrected before the physical parameters reach their setpoint values, by accounting for the differences between the real values of the physical parameters and the setpoint values of these parameters. Finally, the engine control system controls fuel injection into the combustion chamber when the crank angle is equal to this corrected setpoint value &#x3b8;in order to keep combustion optimal.

Method of controlling the combustion of a diesel engine

A method of controlling the combustion of a spark-ignition engine having application to gasoline engines is disclosed. An engine control system controls actuators so that the values of physical parameters linked with the combustion of a mixture of gas and fuel in a combustion chamber are equal to their setpoint values, to optimize the combustion. A setpoint value is determined for an ignition crank angle of the fuel mixture which is then corrected before the physical parameters reach their setpoint values. A correction to be applied to this ignition angle setpoint value is calculated so that the crank angle CAis equal to its setpoint value. Finally, the engine control system controls the ignition of the mixture in the combustion chamber when the crank angle is equal to the corrected setpoint value to optimize combustion.

Method of controlling the combustion of a spark-ignition engine using combustion timing control

The invention is a method of controlling trapped gas masses in cylinders of a variable timing gasoline engine. A set point is determined for a trapped air mass in a cylinder and a set point is determined for trapped burnt gas mass in a cylinder. Then, in order to meet these set points: an intake pressure set point is generated from measurements of variable timing of positions of actuators and from the air mass set point; a position set point is generated for each of two variable timing actuators, from an intake pressure measurement and from the burnt gas mass set point; finally, a throttle and the variable timing actuators are controlled so as to meet the intake pressure set point and the set point position of the variable timing actuators.

Method of controlling in-cylinder trapped gas masses in a variable timing gasoline engine

The invention is a method for real-time estimation of the instantaneous engine speed produced by each cylinder of an internal-combustion engine, from an instantaneous engine speed measurement at the end of the engine transmission system. A physical model, representing in real time the dynamics of the transmission system according to the crankshaft angle and to coefficients of a Fourier series decomposition of the instantaneous speed produced by each cylinder, is constructed. These coefficients are determined in real time from coupling between the model and an adaptive type non-linear estimator. The instantaneous speed produced by each cylinder is then deduced from these coefficients. The mean torque produced by each cylinder can also be deduced therefrom. An application is: engine controls.

Method of estimating the instantaneous engine speed produced by each cylinder of an internal-combustion engine

A method of controlling the combustion of a compression ignition engine is disclosed having applications for diesel engine combustion control for CAI. The method comprises determining setpoint values for physical parameters linked with the intake of gaseous oxidizer in the combustion chamber, and a setpoint value (&#x3b8;)for the crank angle at which a fuel has to be injected into the combustion chamber. While the engine control system controls actuators so that the values of the physical parameters are equal to the setpoint values, setpoint value (&#x3b8;)is corrected before the physical parameters reach their setpoint values. Angle CAy is controlled to be equal to a reference value for an optimized combustion while accounting for differences between the real values of the physical parameters and the setpoint values of these parameters and keeps the optimum combustion by fuel injection with the corrected setpoint value.

Method of controlling the combustion of a compression ignition engine using combustion timing control

The invention relates to a method having application to combustion control of an internal-combustion engine for real-time estimation of engine combustion parameters from vibratory signals. A vibratory signal representative of the engine vibrations is continuously acquired as a function of the crank angle, from a vibration detector. Real-time filtering of this vibratory signal and real-time estimation of the Fourier decomposition coefficients for the acquired vibratory signal is carried out by inverting the dynamics of the filter which is used. Finally, real-time estimation of combustion parameters allowing the combustion to be qualified is carried out from these coefficients.

Method for real-time estimation of engine combustion parameters from vibratory signals

The present invention relates to a method of estimating the fuel/air ratio in each cylinder of an injection internal-combustion engine comprising an exhaust circuit on which a detector measures the fuel/air ratio of the exhaust gas. An estimator based on a Kalman filter is coupled with a physical model representing the expulsion of the gases from the cylinders and their travel in the exhaust circuit to the detector. The method has application to engine controls.

Method of estimating the fuel/air ratio in a cylinder of an internal-combustion engine by means of an extended Kalman filter

The present invention relates to a method of estimating the fuel/air ratio in each cylinder of an injection internal-combustion engine comprising an exhaust circuit on which a detector measures the fuel/air ratio of the exhaust gas. An estimator based on an adaptive nonlinear filter is coupled with a physical model representing the expulsion of the gases from the cylinders and their travel in the exhaust circuit to the detector. The estimator is also coupled with an estimation of the fuel/air ratio measured from at least one variable of said model such as the total mass of exhaust gas and the mass of fresh air. The method has application to engine controls.

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Neuilly-sur-Seine, France

Jonathan Chauvin