Knocking presence evaluation circuit for an internal combustion engine, knocking identification and control system and corresponding pressure signal processing method
First Claim
1. A knocking presence evaluation circuit in an internal combustion engine having at least a pressure sensor facing a combustion chamber for each cylinder comprised in the engine itself and suitable to output a pressure signal, said evaluation circuit comprising:
- an input terminal for connection to the pressure sensor;
an output terminal;
a processing block connected to the input terminal and receiving said pressure signal from the pressure sensor via the input terminal, said processing block performing a processing of said pressure signal for isolating oscillations and generating a derived pressure signal;
an acquisition block having an input connected to said processing block and receiving therefrom said derived pressure signal, said acquisition block generating first and second measure signals respectively corresponding to a number and a total duration of digital pulses obtained from said derived pressure signal; and
a soft-computing block having an input connected to said acquisition block and receiving therefrom said first and second measure signals and connected to the output terminal, said soft-computing block supplying the output terminal with a knocking intensity index, calculated by soft-computing techniques, staffing from said first and second measure signals.
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Accused Products
Abstract
A knocking presence evaluation circuit in an internal combustion engine having a pressure sensor facing a combustion chamber for each cylinder in the engine and suitable to produce a pressure signal, the circuit having an input terminal; a processing block connected by the input terminal to the pressure sensor and receiving the pressure signal, the processing block performing a processing of the pressure signal for isolating oscillations and generating a derived pressure signal; an acquisition block connected to the processing block and receiving the derived pressure signal and generating first and second measure signals, respectively corresponding to a number and a total duration of digital pulses, from the derived pressure signal; and a soft-computing block connected to the acquisition block and receiving the first and second measure signals and outputting a knocking intensity index, calculated by soft-computing techniques, starting from the first and second measure signals.
11 Citations
37 Claims
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1. A knocking presence evaluation circuit in an internal combustion engine having at least a pressure sensor facing a combustion chamber for each cylinder comprised in the engine itself and suitable to output a pressure signal, said evaluation circuit comprising:
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an input terminal for connection to the pressure sensor; an output terminal; a processing block connected to the input terminal and receiving said pressure signal from the pressure sensor via the input terminal, said processing block performing a processing of said pressure signal for isolating oscillations and generating a derived pressure signal; an acquisition block having an input connected to said processing block and receiving therefrom said derived pressure signal, said acquisition block generating first and second measure signals respectively corresponding to a number and a total duration of digital pulses obtained from said derived pressure signal; and a soft-computing block having an input connected to said acquisition block and receiving therefrom said first and second measure signals and connected to the output terminal, said soft-computing block supplying the output terminal with a knocking intensity index, calculated by soft-computing techniques, staffing from said first and second measure signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A knocking identification and control system associated with an internal combustion engine having a pressure sensor suitable to output a pressure signal indicative of pressure in a combustion chamber of the engine, the knocking identification and control system comprising:
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a knocking presence evaluation circuit that includes; an input terminal for connection to the pressure sensor; an output terminal; a processing block connected to the input terminal and receiving said pressure signal from the pressure sensor via the input terminal, said processing block performing a processing of said pressure signal for isolating oscillations and generating a derived pressure signal; an acquisition block having an input connected to said processing block and receiving therefrom said derived pressure signal, said acquisition block generating first and second measure signals respectively corresponding to a number and a total duration of digital pulses obtained from said derived pressure signal; and a soft-computing block having an input connected to said acquisition block and receiving therefrom said first and second measure signals and connected to the output terminal, said soft-computing block supplying the output terminal with a knocking intensity index, calculated by soft-computing techniques, staffing from said first and second measure signals; and a control unit connected to the knocking presence evaluation circuit and structured to control the engine. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A method for processing a pressure signal for detecting and evaluating a combustion phenomenon in an internal combustion engine, the method comprising the steps of:
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receiving a pressure signal detected by a pressure sensor associated with said internal combustion engine; isolating oscillations of said pressure signal, and obtaining a derived pressure signal; obtaining from said derived pressure signal digital pulses corresponding to a knocking phenomenon; and measuring a number of digital pulses obtained from said derived pressure signal and measuring a total duration of said digital pulses; wherein said derived pressure signal is obtained by amplifying and filtering said pressure signal, so as to eliminate high frequency oscillations and isolate oscillations in a range of frequencies typical of said knocking phenomenon. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification