Siemens Automotive S.a.

Siemens Vdo Automotive Corporation

Alain Michel Aubourg

Alain A Atanasyan

Jean Cosault

Jean-Michel Le Quellec

Christophe Raymond

Alain Joseph Perez

The invention concerns a method which consists in using an injector supplied with fuel whereof the pressure (P ) is an increasing function of the amount of fuel (Q) to be injected, the opening of the injector being electromagnetically triggered by energizing the electric coil integral with the injector with a current peak of predetermined duration (T ). The invention is characterized in that the duration (T ) of the current peak in an increasing function of the pressure (P ) of the fuel. Thus, the dynamics of the injector is increased.

Method for controlling the amount of fuel injected in a direct injection internal combustion engine

A process to determine an optimal richness of a fuel-air mixture supplied to an internal combustion engine. The engine has a speed regulator capable of varying an opening angle of a valve for admitting the fuel-air mixture into the engine to maintain the engine at a constant rotational speed. The process begins by supplying an initial fuel-air mixture to the engine. A rotational speed of the engine is regulated by acting on a position of a valve controlling the admittance of the initial fuel-air mixture and, therefore, the fuel-air mixture affects the rotational speed. A plurality of jumps in the richness of the fuel-air mixture which is supplied to the engine act on the position of the valve. Variations in the position of the valve corresponding to each of the jumps in richness in the initial fuel-air mixture are then measured. It is then deduced that when the variations in the valve position are lower than a threshold that the initial fuel-air mixture is at an optimal richness, and that when the variations in the valve position are higher than the threshold that the richness of the initial air-fuel mixture must be modified. A correction of the richness of the initial fuel-air mixture supplied to the engine is performed if the threshold is exceeded. In addition, the correction step takes into account an amplitude of the measured variations in the valve position.

Process for determining the optimal richness of a fuel-air mixture

Method and device for reducing harmful gas emissions from a motor

Method and device for controlling the speed of an internal combustion

Method for controlling an internal combustion engine as it enters

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Saint-Jean, France

Alain Michel Aubourg