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AssigneeHIDRIA AET d.o.o.
InventorsMarcel Guwang, Alain Ramond
Estimating the term…
A method and a circuit for processing a signal supplied by a piezoelectric sensor (10) indicating the cylinder pressure of a piston engine such as a heat engine. Undesirable variations in the value of the signal supplied by the sensor and corresponding to plateaux in the pressure are compensated by a closed-loop servo control which is suitable for setting an output signal to a predetermined constant reference value, independently of undesirable variations in the signal from the sensor (10). The value of the output signal is sampled, and at each sampling moment, if the absolute value of the variation in the output signal is less than a comparison value, the servo control is kept active. A circuit for processing and a pressure-measuring device including a circuit of this kind is also described.
A method of processing a signal supplied by a piezoelectric sensor, said signal indicating a pressure value, called the cylinder pressure, prevailing in a cylinder chamber of a piston engine such as a heat engine, said signal having a value in the form of pulses separated by components of greater length, called plateaux, corresponding to values of the cylinder pressure which are at least substantially constant, in which method:
A circuit for processing a signal supplied by a piezoelectric sensor, said signal indicating a pressure value, called the cylinder pressure, prevailing in a cylinder chamber of a piston engine such as a heat engine, said signal having a value in the form of pulses separated by components of greater length, called plateaux, corresponding to values of the cylinder pressure which are at least substantially constant, this circuit comprising:
Dependencies are inferred from the claim text.