Internal combustion engine and method for operating an internal combustion engine
First Claim
1. A method for operating an internal combustion engine that is a single cylinder two-stroke engine that comprises a cylinder with a combustion chamber, which combustion chamber is delimited by a reciprocating piston that drives a crankshaft rotatably supported in a crankcase, wherein the internal combustion engine further comprises an intake passage, an exhaust connected to the combustion chamber, a device supplying fuel, and a control device controlling at least one operating parameter of the internal combustion engine;
- the method comprising the steps of;
a) measuring a pressure in operation of the internal combustion engine;
b) determining an adjustable value for at least one operating parameter of the internal combustion engine based on the measured pressure of the step a);
c) setting the determined adjustable value of step b);
wherein in the step a) the pressure in the crankcase is measured at a first predetermined crankshaft angle during a compression phase and is measured at a second predetermined crankshaft angle during an expansion phase; and
wherein the crankcase is closed off at the first and second predetermined crankshaft angles.
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Accused Products
Abstract
An internal combustion engine has a cylinder with a combustion chamber delimited by a reciprocating piston that drives a crankshaft rotatably supported in a crankcase. The internal combustion engine has an intake passage, an exhaust connected to the combustion chamber, a device supplying fuel, and a control device controlling at least one operating parameter of the internal combustion engine. The internal combustion engine is operated in that a pressure is measured in operation of the internal combustion engine, an adjustable value for at least one operating parameter of the internal combustion engine is deteremined based on the measured pressure, and the determined adjustable value is set for optimized running of the engine.
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Citations
35 Claims
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1. A method for operating an internal combustion engine that is a single cylinder two-stroke engine that comprises a cylinder with a combustion chamber, which combustion chamber is delimited by a reciprocating piston that drives a crankshaft rotatably supported in a crankcase, wherein the internal combustion engine further comprises an intake passage, an exhaust connected to the combustion chamber, a device supplying fuel, and a control device controlling at least one operating parameter of the internal combustion engine;
- the method comprising the steps of;
a) measuring a pressure in operation of the internal combustion engine; b) determining an adjustable value for at least one operating parameter of the internal combustion engine based on the measured pressure of the step a); c) setting the determined adjustable value of step b); wherein in the step a) the pressure in the crankcase is measured at a first predetermined crankshaft angle during a compression phase and is measured at a second predetermined crankshaft angle during an expansion phase; and wherein the crankcase is closed off at the first and second predetermined crankshaft angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- the method comprising the steps of;
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24. A method for operating an internal combustion engine that comprises a cylinder with a combustion chamber, which combustion chamber is delimited by a reciprocating piston that drives a crankshaft rotatably supported in a crankcase, wherein the internal combustion engine further comprises an intake passage, an exhaust connected to the combustion chamber, a device supplying fuel, and a control device controlling at least one operating parameter of the internal combustion engine;
- the method comprising the steps of;
a) measuring a pressure in operation of the internal combustion engine and measuring the engine speed of the internal combustion engine, wherein the pressure is measured in the crankcase at a predetermined crankshaft angle; b) determining an adjustable value for at least one operating parameter of the internal combustion engine based on the measured pressure of the step a); c) setting the determined adjustable value of step b); wherein, based on the pressure measured in the step a), an air quantity flowing through the combustion chamber is calculated; wherein the internal combustion engine is a two-stroke engine having at least one transfer passage through which the combustion air sucked into the crankcase passes into the combustion chamber, wherein the air quantity is calculated as air mass flow m with equation m=Δ
m*A/60—
with A being the number of working cycles per minute and m being the air mass flow per second—
based on a calculation of a combustion air mass Δ
m transferred into the combustion chamber for one working cycle by employing the ideal-gas law, wherein the pressure and the temperature of the first predetermined crankshaft angle;
the pressure and the temperature of the second predetermined crankshaft angle;
volumes of the crankcase at the first and second predetermined crankshaft angles; and
the gas constant are used in the ideal-gas law. - View Dependent Claims (25, 26, 27)
- the method comprising the steps of;
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28. An internal combustion engine comprising:
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a cylinder having a combustion chamber; a reciprocating piston arranged reciprocatingly in the cylinder and delimiting the combustion chamber; a crankcase attached to the cylinder; a crankshaft rotatably supported in the crankcase and driven by the piston; an intake passage supplying combustion air; an exhaust connected to the combustion chamber; a device for supplying fuel; a control device controlling the internal combustion engine; a pressure sensor for determining a crankcase pressures; a temperature sensor measuring a crankcase temperature of the crankcase, wherein the temperature sensor is adapted to measure the average crankcase temperature. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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Specification