Method for operating an internal combustion engine, and internal combustion engine
AssigneeMTU Friedrichshafen GmbH
InventorsGünther Schmidt, Ralf Speetzen
Life of this patent
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Abstract
A method for operating an internal combustion engine having an engine with a first number of cylinders and a second number of cylinders and a supercharger arrangement, wherein a charge air flow supplied to the engine is compressed by means of at least one compressor and at least one turbine is acted on by an exhaust gas flow discharged from the engine. In a main operating mode, the engine operates the first number of cylinders in two-stroke operation and the second number of cylinders in four-stroke operation. A scavenging gradient of the engine is greater for the cylinders operated in the two-stroke operation than for the cylinders operated in the four-stroke operation.
Claims15
A method for operating an internal combustion engine, the internal combustion engine including an engine with a first number of cylinders and a second number of cylinders and a supercharger arrangement, the method comprising the steps of:
- supplying a charge air flow to the engine, the charge air being compressed by at least one compressor and at least one turbine that is acted on by an exhaust gas flow discharged from the engine;
- and
- operating the engine in a main operating mode that includes:
- operating the first number of cylinders in a two-stroke operation;
- and
- operating the second number of cylinders in a four-stroke operation,
- wherein a scavenging gradient is greater for the first number of cylinders operated in the two-stroke operation than for the second number of cylinders operated in the four-stroke operation,
- wherein a second exhaust gas flow of the second number of cylinders operated in the four-stroke operation is used for producing the scavenging gradient in the first number of cylinders operated in the two-stroke operation.
A device for operating an internal combustion engine, comprising:
- an engine with a first number of cylinders and a second number of cylinders;
- a supercharger arrangement wherein a charge air flow is supplied to the engine, the charge air flow being compressed by at least one compressor and at least one turbine that is acted on by an exhaust gas flow discharged from the engine;
- control and processor means carrying out a method for controlling and regulating the internal combustion engine by executing the step of operating the internal combustion engine in a main operating mode,
- wherein the first number of cylinders of the engine are operated in a two-stroke operation and the second number of cylinders of the engine are operated in a four-stroke operation,
- wherein a scavenging gradient is greater for the first number of cylinders operated in the two-stroke operation than for the second number of cylinders operated in the four-stroke operation,
- wherein a second exhaust gas flow of the second number of cylinders operated in the four-stroke operation is used for producing the scavenging gradient in the first number of cylinders operated in the two-stroke operation.
An internal combustion engine, comprising:
- an engine with a first number of cylinders and a second number of cylinders;
- a supercharger arrangement with at least one low-pressure stage wherein a charge air flow supplied to the engine is compressed by at least one compressor and at least one turbine acted on by an exhaust gas flow discharged from the engine;
- and
- a control or processor carrying out the step of operating the internal combustion engine in a main operating mode,
- wherein the first number of cylinders are operated in a two-stroke operation and the second number of cylinders are operated in a four-stroke operation,
- wherein a scavenging gradient is greater for the first number of cylinders operated in the two-stroke operation than for the second number of cylinders operated in the four-stroke operation,
- wherein a second exhaust gas flow of the second number of cylinders operated in the four-stroke operation is used for producing the scavenging gradient in the first number of cylinders operated in the two-stroke operation.
Dependencies are inferred from the claim text.