Regie Nationale Des Usines Renault

Renault Vehicules Industriels

Marc Miettaux

Jean-Pierre Jourde

Yves Drutel

Denis Ranc

Thierry Michaux

Pedro Cmapo-Garraza

Specific parameters of each of the injectors of the injection device of a combustion engine, especially a device with pre-injection with electronic control of a diesel engine, are determined. The curve of the instantaneous speed difference (DVi) of the engine shaft between the time of transition to the combustion top dead center point of the cylinder in question and a subsequent time preceding the transition to the combustion top dead center point of the following cylinder is established as a function of the value of the parameter to be determined, the other parameters of functioning being kept constant. The optimum value of the parameter is determined which corresponds to an extremum of the curve.

Process and device for determining the parameters of the fuel injectors

A detection process and device for electronic injection control of a multicylinder engine of an automobile engine, which performs the functions of measuring the speed of rotation of the engine, pinpointing the angular position of the top dead center of each cylinder of the engine, and identifying at any time which one of the cylinders for which the injection of fuel is to take place. The device includes a multipolar ring provided with multiple north and south magnetic poles distributed alternately on the circumference of the ring; a pair of sensors sensitive to the magnetic field produced by the multipolar ring mounted facing the ring and spaced angularly from one another; and an electronic processing interface connected to the sensors to deliver signals to a computer for control of the electronic injection of the engine.

Detection process and device for the electronic injection control of a

A male part such as a needle valve (1) is guided in a bore such as that of a nozzle (2) in a manner such that male part exhibits a passage function of a pressurized fluid (1A) and the bore works with a volume (3, 6) subjected to the effect of the pressure.

Cylindrical guide device with operating play compensation for fuel

Variable flow pump comprising at least a piston (1) associated with a chamber (2), said piston (1) cooperating with a surface (3) driven in a constant displacement reciprocating movement, characterized in that the piston (1) is free of any continuous mechanical connection with said surface (3); and wherein said chamber (2) is associated with a flow regulating system (9) placed upstream, and wherein it is equipped with a clack valve (7) on the feed and with a clack valve (8) on the delivery; said regulating system (9) being fed by a booster pump (10).

Variable flow pump

A safety device for constant-pressure injection valve of an internal combustion engine. This device blocks the main supply line of the valve permanently and definitely in case the maximum admissible amount of injected fuel is exceeded or the control frequency for a given injected amount, less than the maximum admissible amount, is exceeded. The device is particularly applicable to diesel injection of the pressure-time type.

Safety device for constant-pressure injection valve of internal

Improvements in electromagnetic control injection systems for diesel engines of the pressure-time type where the injection needle is controlled by the discharging then charging of a chamber. Electromagnetic control fuel injection system for diesel engines in which a three-way solenoid valve is placed in the injection holder, the injector needle being controlled during its opening by the pressure drop of the fuel contained in the control space. A disc having a nozzle is used to throttle the passage assuring the pressure drop in the control chamber without throttling the passage during a rise in pressure so that the injector needle begins to move only after the complete movement of the solenoid valve.

Growing community of inventors

Decines, France

Marc Miettaux