Abstract: Process for fixed-bed reforming of a hydrocarbon-based feedstock comprising n-paraffinic, naphthenic and aromatic hydrocarbons, at a temperature of between 400 and 700° C., a pressure of between 0.1 and 4 MPa, and a mass flow of feedstock treated per unit mass of catalyst and per hour of between 0.1 and 10 h?1, by bringing said feedstock into contact with a catalyst comprising platinum, a promoter metal selected from the group consisting of rhenium and iridium, a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, and a porous alumina support in the form of an extrudate characterized by a length “l” of between 1 and 10 mm, a section comprising four lobes, the largest diameter “D” of the cross section of said extrudate being between 1 and 3 mm.

Abstract: The present invention relates to a method for controlling air injection into the exhaust of an internal-combustion engine running on a cycle during which the expansion phase (D) thereof has a greater stroke than the compression phase (C) thereof and comprising at least one cylinder (10) with a combustion chamber (18), a piston (16), at least one intake means (24) with a valve (28) associated with an intake pipe (26), at least one exhaust means (30) with a valve (34) associated with an exhaust pipe (32), fresh air injection means (48) at the exhaust and an exhaust line (40) comprising at least one exhaust gas depollution means (46).

Abstract: The present invention relates to a method for regenerating a particle filter (10) arranged in the exhaust line (12) of an internal-combustion engine, notably of diesel type, wherein the clogging state of the filter is evaluated, this state is compared with a threshold value, then, if this threshold value is exceeded, a fluid and a fuel are mixed together, this mixture is subjected to catalytic combustion to generate the hot gases required for regeneration of the filter and regeneration of the filter is carried out by means of hot gases flowing through said filter and whose temperature is sufficiently high to provide combustion of the particles retained in this filter. According to the invention, prior to mixing the fluid and the fuel, the temperature of the fluid is raised up to the catalytic combustion light-off temperature.

Abstract: The present invention relates to a method for regenerating a particle filter (10) arranged in the exhaust line (12) of an internal-combustion engine, notably of diesel type, wherein the clogging state of the filter is evaluated, this state is compared with a threshold value, then, if this threshold value is exceeded, a fluid and a fuel are mixed together, this mixture is subjected to catalytic combustion to generate the hot gases required for regeneration of the filter and regeneration of the filter is carried out by means of hot gases flowing through said filter and whose temperature is sufficiently high to provide combustion of the particles retained in this filter. According to the invention, prior to mixing the fluid and the fuel, the temperature of the fluid is raised up to the catalytic combustion light-off temperature.

Abstract: Self-ignition control in a four-stroke internal-combustion engine, comprising several intake means and several exhaust means per cylinder. In order to reduce nitrogen oxide emissions during part-load operation, the exhaust means of each cylinder open (1 and 2) respectively during the exhaust phase so as to discharge the burnt gases from the cylinder and during the intake phase so as to reintroduce burnt gases into the cylinder, the time of opening (3) of an intake means being deferred so to allow fresh gas to pass into the cylinder after partial filling thereof with the burnt gases.

Abstract: The present invention relates to a process for optimizing the combustion of an internal-combustion engine running under controlled self-ignition conditions, wherein the state of the combustion of an air/fuel mixture in combustion chamber (14) is measured and, after processing the measuring signals sent to a logical processing unit (46), at least one combustion control parameter is adjusted so as to obtain the desired combustion for the next cycles. The process includes several parameters to be adjusted are determined to optimize the combustion, said parameters are divided into fast parameters (PR) and slow parameters (PL), the fast parameters (PR) are managed by means of a control loop specific to said parameters and the slow parameters (PL) are managed by means of a control loop specific to the slow parameters to obtain the desired combustion for the next cycles.

Abstract: The present invention relates to a controlled self-ignition combustion process in a four-stroke engine having plural cylinders (1) having each at least a first intake (2) and at least a first exhaust (3). The process according to the invention during partial load operation, transfers, via at least one additional port (4) of each cylinder and an exhaust gas transfer, exhaust gases from a cylinder in the exhaust phase to another cylinder in the intake phase. The present invention further relates to a multicylinder four-stroke engine working on controlled self-ignition, allowing implementation of the above-described process.

Abstract: The present invention relates to a process for optimizing the combustion of an internal-combustion engine running under controlled self-ignition conditions, wherein the state of the combustion of an air/fuel mixture in combustion chamber (14) is measured and, after processing the measuring signals sent to a logical processing unit (46), at least one combustion control parameter is adjusted so as to obtain the desired combustion for the next cycles. The process includes several parameters to be adjusted are determined to optimize the combustion, said parameters are divided into fast parameters (PR) and slow parameters (PL), the fast parameters (PR) are managed by means of a control loop specific to said parameters and the slow parameters (PL) are managed by means of a control loop specific to the slow parameters to obtain the desired combustion for the next cycles.

Abstract: Self-ignition control in a four-stroke internal-combustion engine, comprising several intake means and several exhaust means per cylinder. In order to reduce nitrogen oxide emissions during part-load operation, the exhaust means of each cylinder open (1 and 2) respectively during the exhaust phase so as to discharge the burnt gases from the cylinder and during the intake phase so as to reintroduce burnt gases into the cylinder, the time of opening (3) of an intake means being deferred so to allow fresh gas to pass into the cylinder after partial filling thereof with the burnt gases.

Abstract: This invention relates to a process for monitoring the flow rate of oil that is injected into a two-stroke internal combustion engine where the oil is injected independently of the gasoline. According to the invention, the oil flow rate is based on a temperature that represents the heat load of the engine. More specifically, this temperature can be that of an element that constitutes the engine, such as that of the spark plug gasket.

Abstract: The present invention relates to a self-ignition combustion process in a four-stroke internal-combustion engine comprising at least one cylinder (1) having at least a first intake (2) and at least a first exhaust. The process according to the invention, at partial load, fills an external volume (10) independent of cylinder (1) with burned gases, the volume (10) being connected to cylinder (1) by a specific port and a specific line (9), and in controlling the flow and/or the pressure of the burned gases in the volume (10) through a throttle 15 (11; 14) associated with a seal allowing selective sealing of the specific port such as a valve (S or S1 and S2). The present invention further relates to a four-stroke engine implementing the above-described process.

Abstract: The present invention is a process for controlling self-ignition in a four-stroke engine comprising variable control of the opening and the closing of the intake and exhaust in the combustion chamber as a function of the engine load. At partial load the invention performs (a) prolonged retention of burned gases in the combustion chamber, and (b) a fresh gas intake period which overall follows the retention period, in order to minimize mixing of the fresh gases with the burned gases and to control the amount of burned gases retained in the combustion chamber.

Abstract: The present invention relates to a process for delivering and for metering additives to the combustion chamber of an internal-combustion engine consuming a known and controlled amount of lubricant, according to which the lubricant consumed comprises at least one additive designed to improve the quality of the combustion in the chamber. In particular, the additive is designed to promote the combustion of an engine working with controlled self-ignition and to obtain operation in a wider speed and/or load range of the engine.