Method for measuring fresh air by evaluating an internal cylinder pressure signal
First Claim
1. A method for controlling combustion in a cylinder of an internal combustion engine, the method comprising:
- determining a first filling equivalent during a compression phase of the cylinder,wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase,determining a second filling equivalent during an expansion phase of the cylinder,wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase,forming a differential filling equivalent by subtracting the first filling equivalent from the second filling equivalent,determining the air mass in the cylinder based on the differential filling equivalent,calculating an amount of fuel to be injected into the cylinder to achieve a desired fuel/air mixture based on the determined air mass and injecting the calculated amount of fuel into the cylinder during a following combustion cycle,determining a percentage combustion proportion of a complete combustion of a fuel in the cylinder at the start of the second angle range of the expansion phase, anddetermining a correction factor indicative of the percentage combustion proportion,wherein the determination of the second filling equivalent comprises;
determining an uncorrected, second filling equivalent, anddetermining the second filling equivalent using the formula;
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Accused Products
Abstract
A method for determining an air mass air in a cylinder of an internal combustion engine is disclosed. A first filling equivalent is determined during a compression phase of the cylinder, wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase. A second filling equivalent is determined during an expansion phase of the cylinder, wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase. A differential filling equivalent is calculated by subtracting the first filling equivalent from the second filling equivalent. The air mass in the cylinder is determined based on the differential filling equivalent.
10 Citations
12 Claims
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1. A method for controlling combustion in a cylinder of an internal combustion engine, the method comprising:
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determining a first filling equivalent during a compression phase of the cylinder, wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase, determining a second filling equivalent during an expansion phase of the cylinder, wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase, forming a differential filling equivalent by subtracting the first filling equivalent from the second filling equivalent, determining the air mass in the cylinder based on the differential filling equivalent, calculating an amount of fuel to be injected into the cylinder to achieve a desired fuel/air mixture based on the determined air mass and injecting the calculated amount of fuel into the cylinder during a following combustion cycle, determining a percentage combustion proportion of a complete combustion of a fuel in the cylinder at the start of the second angle range of the expansion phase, and determining a correction factor indicative of the percentage combustion proportion, wherein the determination of the second filling equivalent comprises; determining an uncorrected, second filling equivalent, and determining the second filling equivalent using the formula; - View Dependent Claims (2, 3, 4)
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5. A method for operating an internal combustion engine, the method comprising:
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determining an air mass in a cylinder of an internal combustion engine by a process including; determining a first filling equivalent during a compression phase of the cylinder, wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase, determining a second filling equivalent during an expansion phase of the cylinder, wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase, forming a differential filling equivalent by subtracting the first filling equivalent from the second filling equivalent, and determining the air mass in the cylinder based on the differential filling equivalent, and calculating an amount of fuel added to the cylinder to reach a setpoint fuel/air ratio based on the determined air mass in the cylinder of the internal combustion engine and injecting the calculated amount of fuel into the cylinder during a following combustion cycle, wherein determining the air mass in a cylinder further comprises; determining a percentage combustion proportion of a complete combustion of a fuel in the cylinder at the start of the second angle range of the expansion phase, and determining a correction factor indicative of the percentage combustion proportion, wherein the determination of the second filling equivalent comprises; determining an uncorrected, second filling equivalent, and determining the second filling equivalent using the formula; - View Dependent Claims (6, 7, 8)
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9. A control unit for an internal combustion engine, the control unit comprising:
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a processor; and computer instructions stored in non-transitory computer-readable media and executable by the processor to determine an air mass in a cylinder of the internal combustion engine by a process including; determining a first filling equivalent during a compression phase of the cylinder, wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase, determining a second filling equivalent during an expansion phase of the cylinder, wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase, forming a differential filling equivalent by subtracting the first filling equivalent from the second filling equivalent, determining the air mass in the cylinder based on the differential filling equivalent, calculating an amount of fuel to be injected into the cylinder to achieve a desired fuel/air mixture based on the determined air mass and injecting the calculated amount of fuel into the cylinder during a following combustion cycle, determining a percentage combustion proportion of a complete combustion of a fuel in the cylinder at the start of the second angle range of the expansion phase, and determining a correction factor indicative of the percentage combustion proportion, wherein the determination of the second filling equivalent comprises; determining an uncorrected, second filling equivalent, and determining the second filling equivalent using the formula; - View Dependent Claims (10, 11, 12)
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Specification