Method For Measuring Fresh Air By Evaluating An Internal Cylinder Pressure Signal
First Claim
1. A method for determining an air mass 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, anddetermining the air mass in the cylinder based on the differential filling equivalent.
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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.
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Citations
17 Claims
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1. A method for determining an air mass 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, and determining the air mass in the cylinder based on the differential filling equivalent. - View Dependent Claims (2, 3, 4, 5)
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6. 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 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 (Δ
p comp) 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 corresponds by subtracting the first filling equivalent from the second filling equivalent, and determining the air mass in the cylinder based on the differential filing equivalent, and setting a fuel/air mixture of the internal combustion engine based on the determined air mass in the cylinder of the internal combustion engine. - View Dependent Claims (9, 10, 11, 12)
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7-8. -8. (canceled)
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13. 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 (Δ
p comp) 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. - View Dependent Claims (14, 15, 16, 17)
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Specification