Abstract: A method for detecting a cylinder-specific combustion profile parameter value for an internal combustion engine is described. The method includes the following: (a) detecting a toothed encoder signal, (b) determining a cylinder-specific tooth time interval on the basis of the toothed encoder signal, (c) determining a cylinder-specific phase value on the basis of a Fourier transformation of a part of the toothed encoder signal corresponding to the cylinder-specific tooth time interval, (d) determining the combustion profile parameter value on the basis of the cylinder-specific phase value and a stored transfer function which represents a relationship between the combustion profile parameter and the phase value.

Abstract: System for controlling an engine provided with an exhaust gas post-treatment system of the selective catalysis type, including a closed-loop control of NOx before the gas post-treatment system, according to the following steps: ? a unit for determining a NOx setpoint in dependence on the rotational speed and the torque setpoint of the engine, ? a unit for determining a NO value, and ? a cascade control unit which is able to determine a setpoint for admitted oxygen and a correction of the supercharging pressure destined for unit for controlling the air loop of the engine as well as a correction of the injection pressure and a correction of the advance of the main injection in dependence on a NOx difference, between a NOx emission setpoint or corrected emission setpoint and a determined value of the quantity of NOx.

Abstract: A method for detecting a cylinder-specific combustion profile parameter value for an internal combustion engine is described. The method includes the following: (a) detecting a toothed encoder signal, (b) determining a cylinder-specific tooth time interval on the basis of the toothed encoder signal, (c) determining a cylinder-specific phase value on the basis of a Fourier transformation of a part of the toothed encoder signal corresponding to the cylinder-specific tooth time interval, (d) determining the combustion profile parameter value on the basis of the cylinder-specific phase value and a stored transfer function which represents a relationship between the combustion profile parameter and the phase value.

Abstract: System for controlling an engine provided with an exhaust gas post-treatment system of the selective catalysis type, including a closed-loop control of NOx before the gas post-treatment system, according to the following steps: ? a unit for determining a NOx setpoint in dependence on the rotational speed and the torque setpoint of the engine, ? a unit for determining a NO value, and ? a cascade control unit which is able to determine a setpoint for admitted oxygen and a correction of the supercharging pressure destined for unit for controlling the air loop of the engine as well as a correction of the injection pressure and a correction of the advance of the main injection in dependence on a NOx difference, between a NOx emission setpoint or corrected emission setpoint and a determined value of the quantity of NOx.

Abstract: Disclosed is a method for determining the engine torque delivered by a multi-cylinder engine, including the following steps: determining the angular velocity of the crankshaft and measuring the cylinder pressure over an angular window of combustion in a first cylinder fitted with a cylinder pressure sensor; calculating the value of the engine torque (TQIref) in this window; determining a current transfer function for the learning of the torque, so as to estimate the torque TQImdl(cyl)) in a second cylinder not fitted with a cylinder pressure sensor, from the product of: the engine torque calculated over the angular window of the first cylinder, a ratio between: the angular velocity of the crankshaft over an angular window of combustion of the second cylinder, and the angular velocity of the crankshaft over the window of combustion of the first cylinder.

Abstract: A method (45) for determining the total pressure in a cylinder (Pcyl) of an engine as a function of the angular position (crk) of a crankshaft (14) and from a quantity of fuel to be injected in possibly several injections, includes: determining the pressure in the cylinder when there is no combustion, the pressure being called the pressure without combustion (Pcyl_m), determining, for each injection (inji), a curve of sub-variation of pressure (?Pcomb_i) caused by the combustion of the fuel quantity injected during the such injection (inji), the shape of the curve being estimated as a function of the quantity of fuel to be injected (MFi) and of the angular position for start of injection (SOIi) of the corresponding injection, determining the total pressure in the cylinder (Pcyl) by adding together the pressure without combustion (Pcyl_m) and the pressures given by the pressure sub-variation curves (?Pcomb_i) of each injection (inji).

Abstract: Disclosed is a method for determining the engine torque delivered by a multi-cylinder engine, including the following steps: determining the angular velocity of the crankshaft and measuring the cylinder pressure over an angular window of combustion in a first cylinder fitted with a cylinder pressure sensor; calculating the value of the engine torque (TQIref) in this window; determining a current transfer function for the learning of the torque, so as to estimate the torque TQImdl(cyl)) in a second cylinder not fitted with a cylinder pressure sensor, from the product of: the engine torque calculated over the angular window of the first cylinder, a ratio between: the angular velocity of the crankshaft over an angular window of combustion of the second cylinder, and the angular velocity of the crankshaft over the window of combustion of the first cylinder.

Abstract: A method for determining the recycled air flow rate and oxygen quantity at the inlet of an internal combustion engine cylinder. The method involves measuring pressure in each cylinder during a compression phase and calculating the mass of gas in each cylinder based on the measured pressure, volume and temperature variation for an angular variation of the crankshaft, heat capacity, and heat losses. The method further involves determining the mass of gas in all cylinders over a full combustion cycle as well as in the recycled exhaust.

Abstract: A method (45) for determining the total pressure in a cylinder (Pcyl) of an engine as a function of the angular position (crk) of a crankshaft (14) and from a quantity of fuel to be injected in possibly several injections, includes: determining the pressure in the cylinder when there is no combustion, the pressure being called the pressure without combustion (Pcyl_m), determining, for each injection (inji), a curve of sub-variation of pressure (?Pcomb_i) caused by the combustion of the fuel quantity injected during the such injection (inji), the shape of the curve being estimated as a function of the quantity of fuel to be injected (MFi) and of the angular position for start of injection (SOIi) of the corresponding injection, determining the total pressure in the cylinder (Pcyl) by adding together the pressure without combustion (Pcyl_m) and the pressures given by the pressure sub-variation curves (?Pcomb_i) of each injection (inji).

Abstract: A method for determining a mass of fuel injected into an internal combustion engine cylinder provided with a pressure sensor, includes: determining the temperature prevailing in the cylinder and amount heat released from the measured pressure; integrating amounts of heat released over a predetermined time interval to determine a cumulative amount of heat; estimating the heat losses by taking into account heat losses due to radiation and which are dependent on the measured temperature to the fourth power, and heat losses due to conduction and/or convection and dependent on both the measured temperature and corresponding engine speed, according to the formula: QP=? HRCUM, where QP is the amount of heat corresponding to the heat losses, HRCUM is the cumulative amount of heat, a is a corrective factor; and determining the amount of fuel injected, which is proportional to the cumulative amount of heat added to the heat losses.

Abstract: A method includes: measuring the pressure in each cylinder during a compression phase; determining the mass of gas present in each cylinder, according to the following formula: MAF_CYL = [ Pcyl × ? V ? ( crk ) × ? - 1 CV ] / ? Tcyl ? ( crk ) where: MAF_CYL is the mass of gas in the cylinder in question, Pcyl is the pressure measured in the cylinder, dV/d(crk) is the variation of volume in the cylinder for an angular variation of the crankshaft equal to d(crk), dTcyl/d(crk) is the variation of temperature in the cylinder for an angular variation of the crankshaft equal to d(crk), CV is the heat capacity at constant volume of the mass of gas, ??1 is the corrective term representing the heat losses taken into consideration; determining the mass of gas present in all the cylinders of the engine over a full combustion cycle, determining the mass of gas corresponding to the recycled exhaust gas.

Abstract: A low computation method for operating auto ignition combustion engines, in which outputs, in particular a requested torque set point TQI_SP is directly linked to an injected fuel mass flow distribution, to the EGR rate and the air control by taking into account engine out emissions & drivability constrains by using a multi-objective optimization method. A method to monitor in the embedded controller the indicated torque, TQI is also proposed.

Abstract: A low computation method for operating auto ignition combustion engines, in which outputs, in particular a requested torque set point TQI_SP is directly linked to an injected fuel mass flow distribution, to the EGR rate and the air control by taking into account engine out emissions & drivability constrains by using a multi-objective optimization method. A method to monitor in the embedded controller the indicated torque, TQI is also proposed.