Ifp Energies Nouvelles

Jean-Marc Zaccardi

Alexandre Pagot

Laurent Duval

Benoist Thirouard

Thierry Colliou

Dominique Auclair

Olivier Baudrand

Franck Vangraefschepe

Aurélien Schutz

Control of a quantity of air introduced into an intake of a supercharged internal combustion engine which includes a proportional valve located in a partial transfer duct which controls flow of compressed air flow through the partial transfer duct into an inlet of a turbine. The proportional valve is controlled to move between open and closed positions in accordance with strategies in accordance with stabilized phases of operation of the engine. Characteristics of stabilized phases of operation of the engine are determined and are used to control circulation of the compressed air during transitions between the stabilized phases of engine operation in accordance with the determined characteristics of the stabilized phases of the engine operation. The determined characteristics are derived from a previously completed mapping of speed and charging of the supercharged engine during a previous stabilized phase.

Method for controlling the quantity of air introduced to the intake of a supercharged internal combustion engine by a single-inlet turbocompressor

The present invention controls the amount of air fed to the intake of a supercharged internal-combustion engine. The engine includes two exhaust gas outlets () each connected to an exhaust manifold () of a group of at least one cylinder (), a turbocharger with a dual-inlet () turbine () connected to the exhaust gas outlets, and to an outside air compressor (), and a duct () for partial transfer of the compressed air from the compressor to the turbine inlets. Two branches () of the partial transfer duct, are connected to the turbine inlets. Each branch carries proportional throttle (), and the compressed air circulation in the branches is controlled during transient operation phases according to strategies applied to the proportioned throttle valves and determined in accordance with the stabilized phase characteristics.

Method of controlling the amount of air fed into the intake of a supercharged internal combustion engine

A method for detection of abnormal combustion for internal combustion engines is disclosed. A physical model is chosen that describes, as a function of the angle &#x3b1; of rotation of the engine crankshaft, the development of pressure in the cylinder during combustion without any pre-ignition phenomenon. The cylinder pressure P(&#x3b1;) is estimated using this model and the intake pressure is measured. The beginning of abnormal combustion is detected by comparing a first value of a variable calculated using the measurement of the cylinder pressure, to a second value of the variable calculated using the estimation of the cylinder pressure. The amplitude of the pre-ignition is determined by repeating these steps for a defined number of crankshaft angles. Then the progress of the abnormal combustion detected in the combustion chamber is controlled as a function of the amplitude of the pre-ignition phenomenon.

Method for detection of abnormal combustion for internal combustion engines

An abnormal combustion detection method for spark-ignition internal-combustion engines, from combustion indicator distribution modelling is disclosed. At least one combustion indicator such as CA10 is determined. The distribution of N values of this indicator, acquired over N cycles preceding the cycle in progress, is modelled by determining coefficients of a theoretical distribution law. Modelling is repeated by removing extreme values from among the N values or for various working points of the engine, to obtain an evolution of the coefficients. At least one parameter characterizing evolution of at least one of these coefficients is determined. The start of an abnormal combustion is detected by comparing the parameter with a predetermined threshold, and the course of the abnormal combustion detected in the combustion chamber is controlled.

Abnormal combustion detection method for internal-combustion engines from combustion indicator distribution modelling

An abnormal combustion detection method is disclosed for spark-ignition internal-combustion engines, from combustion indicators. Combustion indicators, such as CA10 and MIP, are determined which are converted to new indicators having lower dispersions than those of indicators for normal combustions that are not converted. A parameter characterizing a distribution of N values of the new combustion indicators, acquired over N cycles preceding the cycle in progress, is then determined. The start of an abnormal combustion is thereafter detected by comparing this parameter with a threshold, and the course of the abnormal combustion detected in the combustion chamber is controlled.

Abnormal combustion detection method for internal-combustion engines from several combustion indicators

The present invention relates to a method of controlling the combustion of a spark-ignition internal-combustion engine, in particular a supercharged engine, wherein the engine comprises at least one cylinder () with a combustion chamber (), intake means (), exhaust means () and fuel supply means () allowing a fuel mixture to be achieved in said combustion chamber. According to the invention, the method consists in:

Fuel mixture combustion control method for a spark-ignition internal-combustion engine, notably a supercharged engine

The invention is an abnormal combustion detection method for spark-ignition internal-combustion engines. For each engine cycle, a parameter characterizing a distribution of N combustion indicator values, CA10 for example, acquired over N cycles preceding the cycle in progress, is determined while ignoring extreme values. A threshold is defined from this parameter for the combustion indicator. The start of an abnormal combustion is then detected by comparing the combustion indicator with this threshold and the course of the abnormal combustion detected in the combustion chamber is controlled.

Abnormal combustion detection method for internal-combustion engines

Method of controlling the combustion of an internal-combustion engine, in particular a direct-injection supercharged engine, notably of gasoline type, wherein the engine comprises at least one cylinder () with a combustion chamber () within which a compression stage takes place, followed by a stage of combustion of a fuel mixture by a spark-ignition means (), characterized in that it consists in measuring a quantity related to at least one parameter representative of the state of the fuel mixture during said stages; in determining a value that depends on the amplitude of the measured quantity; in comparing the determined value with at least one threshold value representative of the quantity related to said parameter representative of the conventional state of the fuel mixture during said stages; in detecting the start of an abnormal combustion when the determined value exceeds said threshold value and when the ignition means is not actuated; in controlling the course of the abnormal combustion detected in the combustion chamber.

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Seynod, France

Jean-Marc Zaccardi