Magneti Marelli S.p.a.

Marelli Europe S.p.a.

Saverio Armeni

Walter Nesci

Simona De Cesaris

Gabriele Serra

Marco Parotto

Marco La Sana

Massimo Ambrosino

Pierangelo Pagliano

Antonio Marcelli

Alessandro Pesciarolo

Giuseppe Spinella

Luigi Santamato

Romito Tricarico

Antonio D'Amato

Cesare Pianese

Ivan Arsie

A method for generating an audio signal representing the dynamic state of a land vehicle as a function of the value of at least one first parameter comprises the steps of receiving an input audio signal and dividing the input audio signal into a set of audio frames of given duration; selecting, an audio frame representing the input audio signal; subdividing the selected audio frame into a set of audio sub-frames; determining a probability of transition between orderly pairs of the audio sub-frames and synthesizing the audio signal representing the dynamic state of a land vehicle by generating a sequence of audio sub-frames; computing a centre frequency of the selected audio frame and carrying out a frequency shift of the centre frequency as a function of the centre frequency of the selected audio frame and of the value of at least one first parameter that indicates the dynamic state of the vehicle, thereby generating a frequency-shifted subsequent audio sub-frame.

Method for generating an audio signal, in particular for active control of the sound of the engine of a land vehicle, and corresponding apparatus

Described herein is an apparatus for active control of the sound of the engine of a land vehicle, which comprises a device for detecting a fundamental frequency of the sound of the engine, and comprises a generator of signals representing sound waves that have spectral characteristics that depend upon the aforesaid fundamental frequency. The apparatus comprises a modulator, which includes a module that applies a modulation to said waveforms so as to control a value of roughness or fluctuation strength of an audio signal for driving an actuator, which generates an engine noise.

Apparatus for the active control of the sound of the engine of a land vehicle and corresponding method

A method for performing an active profiling of the sound emitted by a vehicle engine including the steps of injecting second acoustic waves (MW), which are able to combine with the first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW); and generating a driving signal for the diffuser by regulating the amplitude of harmonics of the driving signal (SP) as a function of reference acoustic waves and of a workpoint of the engine, calculating equalization coefficients (&#x3b1;, . . . , &#x3b1;) to be applied to the amplitudes of said harmonics of the driving signal (SP) via a self-tuning procedure, and comparing the reference acoustic waves (TW) with a simulation (SRW) of the resulting waves. The simulation (SRW) is obtained by applying to a simulation of the second acoustic waves a model of the secondary propagation path.

Method for performing an active profiling of a sound emitted by an engine and corresponding profiling system

Described herein is a device for detecting the attitude of motor vehicles, which comprises using at least one filter of a complementary type for computing an estimate ({circumflex over (x)}) of angles of attitude (&#x3b8;, &#x3c6;, &#x3c8;) of the motor vehicle as a function of input signals comprising an acceleration signal (A) and an angular-velocity signal (&#x3c9;). According to the invention, the device () comprises a plurality of complementary filters () each tuned for operating in a specific dynamic range, and a supervisor unit (), that acts to recognize the dynamic range of the input signals (A, &#x3c9;) and select a corresponding filter () from said plurality of complementary filters (, . . . , 12).

Device for detecting the attitude of motor vehicles

A method for determining the closing time of an electromagnetic fuel injector including the steps of applying at a starting time of the injection a positive voltage to the coil of the electromagnetic actuator in order to circulate through the coil an electric current which causes the opening of an injection valve; applying at an ending time of the injection a negative voltage to the coil in order to annul the electric current flowing through the coil; detecting the trend over time of the voltage across the coil after the annulment of the electric current flowing through the coil; identifying a perturbation of the voltage across the coil; and recognizing the closing time of the injector that coincides with the time of the perturbation of the voltage.

Method for determining the closing time of an electromagnetic fuel injector

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Corbetta, Italy

Saverio Armeni