METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE
First Claim
1. A method for operating an internal combustion engine, the internal combustion engine comprising an engine block defining a cylinder accommodating a reciprocating piston coupled to rotate a crankshaft, a fuel injector for injecting fuel inside the cylinder, and a crank position sensor positioned proximal to the crankshaft, the method comprising the steps of:
- commanding the fuel injector to perform a test fuel injection with a predetermined energizing time;
using the crank position sensor to determine a crankshaft acceleration signal during the test fuel injection;
filtering the crankshaft acceleration signal and obtaining a filtered crankshaft acceleration signal;
determining a value of an amplitude of a fundamental frequency component of the filtered crankshaft acceleration signal and obtaining a determined value of the amplitude of the fundamental frequency component;
determining a correction factor of the predetermined energizing time on a basis of a difference between the determined value of the amplitude of the fundamental frequency component and a preset value thereof; and
using the correction factor to correct an energizing time of subsequent fuel injections performed by the fuel injector,wherein the filtering of the crankshaft acceleration signal comprises the steps of;
identifying a frequency (fn) of the crankshaft acceleration signal to be filtered, andfiltering out the frequency (fn) from the crankshaft acceleration signal.
3 Assignments
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Accused Products
Abstract
Methods and apparatus for operating an internal combustion engine are provided. The engine has an engine block defining a cylinder accommodating a reciprocating piston coupled to rotate a crankshaft, a fuel injector for injecting fuel inside the cylinder, and a crank position sensor positioned proximal to the crankshaft. A method includes commanding the fuel injector to perform a test fuel injection with a predetermined energizing time and using the crank position sensor to determine a crankshaft acceleration signal during the test fuel injection. The crankshaft acceleration signal is filtered and a value of an amplitude of a fundamental frequency component of the filtered crankshaft acceleration signal is determined. A correction factor of the predetermined energizing time is determined based on a difference between the determined value of the amplitude and a preset value thereof. The correction factor is used to correct an energizing time of subsequent fuel injections.
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Citations
10 Claims
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1. A method for operating an internal combustion engine, the internal combustion engine comprising an engine block defining a cylinder accommodating a reciprocating piston coupled to rotate a crankshaft, a fuel injector for injecting fuel inside the cylinder, and a crank position sensor positioned proximal to the crankshaft, the method comprising the steps of:
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commanding the fuel injector to perform a test fuel injection with a predetermined energizing time; using the crank position sensor to determine a crankshaft acceleration signal during the test fuel injection; filtering the crankshaft acceleration signal and obtaining a filtered crankshaft acceleration signal; determining a value of an amplitude of a fundamental frequency component of the filtered crankshaft acceleration signal and obtaining a determined value of the amplitude of the fundamental frequency component; determining a correction factor of the predetermined energizing time on a basis of a difference between the determined value of the amplitude of the fundamental frequency component and a preset value thereof; and using the correction factor to correct an energizing time of subsequent fuel injections performed by the fuel injector, wherein the filtering of the crankshaft acceleration signal comprises the steps of; identifying a frequency (fn) of the crankshaft acceleration signal to be filtered, and filtering out the frequency (fn) from the crankshaft acceleration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for operating an internal combustion engine, the internal combustion engine comprising an engine block defining a cylinder accommodating a reciprocating piston coupled to rotate a crankshaft, a fuel injector for injecting fuel inside the cylinder, and a crank position sensor positioned proximal to the crankshaft, the apparatus comprising:
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means for commanding the fuel injector to perform a test fuel injection with a predetermined energizing time; means for using the crank position sensor to determine a crankshaft acceleration signal during the test fuel injection and obtain a determined crankshaft acceleration signal; means for filtering the determined crankshaft acceleration signal and obtaining a filtered crankshaft acceleration signal; means for determining a value of an amplitude of a fundamental frequency component of the filtered crankshaft acceleration signal; means for determining a correction factor of the predetermined energizing time on a basis of a difference between the value of the amplitude of the fundamental frequency component and a preset value thereof, and means for using the correction factor to correct an energizing time of subsequent fuel injections performed by the fuel injector, wherein the means for filtering the determined crankshaft acceleration signal comprises; means for identifying a frequency (fn) of the crankshaft acceleration signal to be filtered and obtaining an identified frequency (fn), and means for filtering out the identified frequency (fn) from the crankshaft acceleration signal.
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9. An automotive system comprising an internal combustion engine, the internal combustion engine comprising an engine block defining a cylinder accommodating a reciprocating piston coupled to rotate a crankshaft, a fuel injector for injecting fuel inside the cylinder, and a crank position sensor positioned proximal to the crankshaft, the crank position sensor being suitable to send crankshaft signals to an Electronic Control Unit of the internal combustion engine, wherein the Electronic Control Unit is configured to:
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command the fuel injector to perform a test fuel injection with a predetermined energizing time; use the crank position sensor to determine a crankshaft acceleration signal during the test fuel injection and obtain a determined crankshaft acceleration signal; filter the determined crankshaft acceleration signal and obtain a filtered crankshaft acceleration signal; determine a value of an amplitude of a fundamental frequency component of the filtered crankshaft acceleration signal and obtain a determined value of an amplitude of the fundamental frequency component; determine a correction factor of the predetermined energizing time on a basis of a difference between the determined value of the amplitude of the fundamental frequency component and a preset value thereof, and use the correction factor to correct an energizing time of subsequent fuel injections performed by the fuel injector, wherein the filtering of the determined crankshaft acceleration signal comprises the steps of; identifying a frequency (fn) of the crankshaft acceleration signal to be filtered and obtaining an identified frequency (fn), and filtering out the identified frequency (fn) from the crankshaft acceleration signal.
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10. A computer readable medium embodying a computer program product, the computer program product comprising:
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a computer program for operating an internal combustion engine, the internal combustion engine comprising an engine block defining a cylinder accommodating a reciprocating piston coupled to rotate a crankshaft, a fuel injector for injecting fuel inside the cylinder, and a crank position sensor positioned proximal to the crankshaft, the computer program configured to; command the fuel injector to perform a test fuel injection with a predetermined energizing time; use the crank position sensor to determine a crankshaft acceleration signal during the test fuel injection; filter the crankshaft acceleration signal and obtain a filtered crankshaft acceleration signal; determine a value of an amplitude of a fundamental frequency component of the filtered crankshaft acceleration signal and obtain a determined value of the amplitude of the fundamental frequency component; determine a correction factor of the predetermined energizing time on a basis of a difference between the determined value of the amplitude of the fundamental frequency component and a preset value thereof; and use the correction factor to correct an energizing time of subsequent fuel injections performed by the fuel injector, wherein during the filtering of the crankshaft acceleration signal the computer program is configured to; identify a frequency (fn) of the crankshaft acceleration signal to be filtered, and filter out the frequency (fn) from the crankshaft acceleration signal.
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Specification