Eldor Corporation S.p.a.

Stefano Bordegnoni

Pasquale Forte

Andrea Gelmetti

The invention relates to the field of methods and devices for reducing the difference between normalized air-fuel ratio of the various cylinders compared with a predetermined value between 0.7 and 1.1, of the normalized air-fuel ratio in an internal combustion engine. The method and devices utilize the signal of the ionization current produced by a suitable device, modifying the quantity of fuel on the basis of the signal determined by means of the method in question in the invention.

Method and devices to reduce the difference between normalized air-fuel ratio of the various cylinders in an internal combustion engine and a predetermined value

Methods and devices for controlling the normalized air-fuel ratio of an internal combustion engine, otherwise known, in technical terms, as Lambda. The present invention is based on the use of the ionization current released by a device positioned on each cylinder of the engine. This ionization current is measured by a Control Unit equipped with a low-pass filter and electronic means which implement the invention.

Method and devices for the control of the air-fuel ratio of an internal combustion engine

The invention relates to the field of method and devices therefore for identifying which cylinder is in the compression phase in a gasoline indirect electronic injection internal combustion engine. The present invention develops over various phases, measuring the signal of the ionisation current of each cylinder in which the piston is located at the top dead centre, registering the average value thereof and comparing it with a predetermined value.

Method and devices to identify the piston in the compression phase in an internal combustion engine equipped with a gasoline indirect electronic injection system

The present invention falls into the field of methods and devices for identifying the various phases of the ionization current during combustion in a cylinder of an internal combustion engine. The present invention develops over various phases comprising the measurement of the ionization current signal and the sampling of the signal within predetermined windows, with the subsequent identification of the sample signal which is preceded by a signal whose derivative has a positive value and followed by a signal whose derivative has a negative value.

Method and devices for the identification of various phases of an ionization current signal during the combustion in an internal combustion engine

Methods and devices for determining and putting in fuel into an internal combustion engine on the basis of an air-fuel ratio in proximity to the stechiometric value, based on the use of the ion current released by a device, positioned on each cylinder of said engine. This ion current is acquired by a Control Unit equipped by means, preferably electronic ones, which implement the invention, repeated continually for each engine cycle and for each cylinder, characterized in that the method develops over various phases.

Method and device for the determination and input of fuel into an internal combustion engine on the basis of an air-fuel ratio target and ionic current sensor

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Orsenigo, Italy

Stefano Bordegnoni