Device and method for processing a signal of pressure measurement of an internal combustion engine combustion chamber
First Claim
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1. A device for processing a pressure-measurement signal of a combustion chamber of an internal combustion engine to determine an instant of start of combustion, comprising:
- a low-pass filter configured to obtain a filtered signal from an output signal of an adder that is configured to add an amplified signal of the pressure-measurement signal and an output of a nonlinear processing element;
means for subtracting the filtered signal from the pressure-measurement signal to obtain a difference signal;
means for comparing the difference signal with a predetermined threshold value; and
means for determining the instant of start of combustion as an instant at which the difference signal attains the predetermined threshold value.
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Abstract
A device for processing a signal of pressure measurement of an internal combustion engine combustion chamber. The device obtains, by a low-pass filter of the pressure measuring signal, a filtered signal, subtracts the filtered signal from the pressure measuring signal to obtain a difference signal, compares the difference signal to a predetermined threshold value, and determines a combustion starting time as a time at which the difference signal reaches the predetermined threshold value.
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Citations
10 Claims
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1. A device for processing a pressure-measurement signal of a combustion chamber of an internal combustion engine to determine an instant of start of combustion, comprising:
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a low-pass filter configured to obtain a filtered signal from an output signal of an adder that is configured to add an amplified signal of the pressure-measurement signal and an output of a nonlinear processing element; means for subtracting the filtered signal from the pressure-measurement signal to obtain a difference signal; means for comparing the difference signal with a predetermined threshold value; and means for determining the instant of start of combustion as an instant at which the difference signal attains the predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for processing a pressure-measurement signal of a combustion chamber of an internal combustion engine to determine an instant of start of combustion, comprising:
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low-pass filtering an output signal that is obtained by adding an amplified signal of the pressure-measurement signal and an output of a nonlinear processing element so as to obtain a filtered signal; subtracting the filtered signal from the pressure-measurement signal to obtain a difference signal; comparing the difference signal with a predetermined threshold value; and determining the instant of start of combustion as an instant at which the difference signal attains the predetermined threshold value. - View Dependent Claims (10)
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Specification