Magneti Marelli S.p.a.

Canio Caterini

Stefano Sgatti

Danilo Pritelli

Gianluca Aurilio

Rosanna Suglia

Francesco Alunni

Andrea Stefani

Luigi De Luca

Roberto Betro'

Marco Raimondi

Alessandro Fossi

A method for the diagnosis of the offset of the resolver of an electric motor, comprising acquiring a predetermined offset of a resolver associated with the electric motor; in a first transient, supplying an excitation current to the phases of the electric motor. As a consequence of the excitation current, a current established on the axis d of minimum reluctance and a current established on an axis q in phase quadrature with respect to the axis of minimum reluctance are determined. The correctness of the offset of the resolver is diagnosed if the current established on the axis d in the first transient is higher than the current established on the axis d in the second or third transient, and if the current established on the axis q in the first transient is lower than the current established on the axis q in the second or third transient.

Method for the diagnosis of the offset of the resolver of an electric machine

A method detects a 'misfire' condition in an internal-combustion engine including a control unit, a driving shaft and phonic wheel that is splined to the shaft and coupled to a sensor. The method comprises steps of: detecting intensity of a signal generated by passage of teeth of the wheel by the sensor, sampling the signal generated by the passage of the teeth, processing the sampled signal by applying a discrete Fourier transform, representing the sampled signal processed by a virtual phasor that represents in a vector form the signal that has been sampled and processed, determining a corresponding theoretical phasor for the virtual phasor that represents theoretical evolution of the signal that has been sampled and processed over time, comparing the theoretical phasor with the virtual phasor, and determining presence of a 'misfire' condition by comparing the theoretical phasor with the virtual phasor that represents the signal that has been sampled and processed.

Method for detecting a misfire condition in an internal combustion engine

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Cancellara, Italy

Canio Caterini