초록 ▼

An internal combustion engine has a plurality of cylinders, and each cylinder has at least one first and one second exhaust port with associated respective first and second exhaust valves. At least one first and one second exhaust manifold are flow-connected to the respective first and second exhaus

An internal combustion engine has a plurality of cylinders, and each cylinder has at least one first and one second exhaust port with associated respective first and second exhaust valves. At least one first and one second exhaust manifold are flow-connected to the respective first and second exhaust ports. A turbo unit for supercharging the charge air delivered to the cylinders comprises at least one first and one second exhaust gas turbine respectively flow connected to the first and the second exhaust manifolds. An exhaust gas chamber flow-connects the first and the second exhaust manifolds upstream of the exhaust gas turbines. The first and second exhaust valves can be deactivated/activated during operation. A throttle valve in the exhaust gas chamber may assume a closed position in order to separate the first and the second exhaust manifolds. A method of operating includes opening and closing different valves at different engine speeds.

대표청구항 ▼

What is claimed is: 1. A method for regulating an internal combustion engine, the engine comprising: a plurality of engine cylinders, each cylinder having at least one first and one second exhaust port and a respective associated first and second exhaust valves for opening and closing the first and

What is claimed is: 1. A method for regulating an internal combustion engine, the engine comprising: a plurality of engine cylinders, each cylinder having at least one first and one second exhaust port and a respective associated first and second exhaust valves for opening and closing the first and the second exhaust ports, wherein the first and second exhaust valves are deactivated or activated during operation of the engine, at least one first and one second exhaust manifold, the first exhaust manifold being flow-connected to the respective first exhaust ports and the second exhaust manifold being flow-connected to the respective second exhaust ports; a turbo unit for supercharging charge air being delivered to the cylinders, the turbo unit comprising at least one first and one second exhaust gas turbine, wherein the first exhaust gas turbine is flow connected to the first exhaust manifold and the second exhaust gas turbine is flow-connected to the second exhaust manifold; an exhaust gas chamber operable to flow-connect the first and the second exhaust manifolds upstream of the exhaust gas turbines in the exhaust gas flow; the method comprising: operating at least one of the first exhaust valves in an active position and operating at least one of the second exhaust valves in an inactive position when the internal combustion engine is operating in a first engine speed range (I), and operating a throttle valve arranged in the exhaust gas chamber in a closed position to separate the first and the second exhaust manifolds during the first engine speed range (I). 2. The method for regulating an internal combustion engine according to claim 1, further comprising the steps of: operating the first exhaust valves in the active position and the second exhaust valves in the inactive position when the internal combustion engine is operating in a second engine speed range (II), and operating the throttle valve in an open position to allow exhaust gases from the first exhaust manifold to pass to the second exhaust gas turbine. 3. The method for regulating an internal combustion engine according to claim 1, further comprising the steps of: operating the first exhaust valves in the active position and at least one of the second exhaust valves in an active position when the internal combustion engine is operating in a third engine speed range (III), and operating the throttle valve in an open position in order to allow exhaust gases from the first exhaust manifold to pass to the second exhaust gas turbine. 4. The method for regulating an internal combustion engine according to claim 1, further comprising the steps of: operating the first exhaust valves in the active position and the second exhaust valves in an active position when the internal combustion engine is operating in a fourth engine speed range (IV), operating the throttle valve in an open position, and operating a regulating valve in an open position to lead excess exhaust gases from each exhaust manifold directly to an exhaust passage. 5. The method for regulating an internal combustion engine according to claim 1, wherein the internal combustion engine comprises an exhaust passage situated downstream in the gas flow of the first and the second exhaust gas turbines; an exhaust duct leading from the exhaust gas chamber to the exhaust passage; and a regulating valve arranged in the exhaust duct and operable for regulating the exhaust gas flow through the exhaust duct; the method further comprising the steps of: operating the first exhaust valves in the active position and the second exhaust valves in the inactive position during a starting phase of the internal combustion engine when the engine is cold, operating the throttle valve in a closed position; and operating the regulating valve in an open position. 6. An internal combustion engine, comprising: a plurality of engine cylinders, each cylinder having at least one first and one second exhaust port and a respective associated first and second exhaust valves for opening and closing the first and the second exhaust ports, the first and second exhaust valves being deactivated and activated during operation of the engine; at least one first and one second exhaust manifold, the first exhaust manifold being flow-connected to the first exhaust port of each engine cylinder and the second exhaust manifold being flow-connected to the second exhaust port of each engine cylinder; a turbo unit for supercharging charge air being delivered to the cylinders, the turbo unit comprising at least one first and one second exhaust gas turbine, the first exhaust gas turbine being flow connected to the first exhaust manifold and the second exhaust gas turbine being flow-connected to the second exhaust manifold; a first intake pipe and a second intake pipe flow connecting the turbo unit to the engine cylinders, the charge air being delivered from the turbo unit to the engine cylinders through the first and second intake pipes; a choke positioned in one of the first intake pipe and the second intake pipe; an exhaust gas chamber operable to flow-connect the first and the second exhaust manifolds upstream of the exhaust gas turbines in an exhaust gas flow; and a throttle valve arranged in the exhaust gas chamber and operable to assume a closed position to separate the first and the second exhaust manifolds, the throttle valve being operable to selectively flow-connect the first exhaust manifold to the first exhaust gas turbine when the engine is cold or is in a first engine speed range (I). 7. The internal combustion engine according to claim 6, further comprising an electromechanical, electrohydraulic or pneumatic device operable for continuously adjusting exhaust valves. 8. The internal combustion engine according to claim 6, further comprising: a first and second exhaust passage separated from one another and situated downstream respectively of the first and the second exhaust gas turbines; a first and a second exhaust line respectively leading from the first and second exhaust manifolds respectively to the first and second exhaust passages; a first and a second regulating valve arranged in the respective first and second exhaust lines for regulating the exhaust gas flow through the respective exhaust lines. 9. The internal combustion engine according to claim 6, further comprising: an exhaust gas passage situated downstream of the first and second exhaust gas turbines; and a regulating valve flow-connected to the exhaust gas chamber and operable to lead excess exhaust gases from the exhaust gas chamber to the exhaust passage, such that the excess exhaust gases bypass each of the first and second exhaust gas turbines. 10. The internal combustion engine according to claim 6, further comprising: first and second exhaust passages situated downstream respectively of the first and second exhaust gas turbines; first and second exhaust lines flow-connected to the first and second exhaust manifolds, respectively; and first and second regulating valves flow-connected to the first and second exhaust lines, respectively, and operable to lead excess exhaust gases from the first and first and second exhaust lines, respectively, such that the excess exhaust gases from the first and second exhaust lines bypass each of the first and second exhaust gas turbines. 11. An internal combustion engine, comprising: a plurality of engine cylinders, each cylinder having at least one first and one second exhaust port and a respective associated first and second exhaust valves for opening and closing the first and the second exhaust ports, the first and second exhaust valves being deactivated and activated during operation of the engine; at least one first and one second exhaust manifold, the first exhaust manifold being flow-connected to the first exhaust port of each engine cylinder and the second exhaust manifold being flow-connected to the second exhaust port of each engine cylinder; a turbo unit for supercharging charge air being delivered to the cylinders, the turbo unit comprising at least one first and one second exhaust gas turbine, the first exhaust gas turbine being flow connected to the first exhaust manifold and the second exhaust gas turbine being flow-connected to the second exhaust manifold; a first intake pipe and a second intake pipe flow connecting the turbo unit to the engine cylinders, the charge air being delivered from the turbo unit to the engine cylinders through the first and second intake pipes; a choke positioned in one of the first intake pipe and the second intake pipe; an exhaust gas chamber operable to flow-connect the first and the second exhaust manifolds upstream of the exhaust gas turbines in an exhaust gas flow; and a throttle valve arranged in the exhaust gas chamber and operable to assume a closed position to separate the first and the second exhaust manifolds, the throttle valve being operable to selectively flow-connect the second exhaust manifold to the second exhaust gas turbine when the engine is in the first engine speed range I. 12. The internal combustion engine according to claim 11, wherein the throttle valve arranged in the exhaust gas chamber is operable to selectively flow-connect the first exhaust manifold to the first exhaust gas turbine, or to both the first and second exhaust gas turbines. 13. An internal combustion engine, comprising: a plurality of engine cylinders, each cylinder having at least one first and one second exhaust port and a respective associated first and second exhaust valves for opening and closing the first and the second exhaust ports, the first and second exhaust valves being deactivated or activated during operation of the engine; at least one first and one second exhaust manifold, the first exhaust manifold being flow-connected to the first exhaust port of each engine cylinder and the second exhaust manifold being flow-connected to the second exhaust port of each engine cylinder; a turbo unit for supercharging charge air being delivered to the cylinders, the turbo unit comprising at least one first and one second exhaust gas turbine, the first exhaust gas turbine being flow connected to the first exhaust manifold and the second exhaust gas turbine being flow-connected to the second exhaust manifold; a first intake pipe and a second intake pipe flow connecting the turbo unit to the engine cylinders, the charge air being delivered from the turbo unit to the engine cylinders through the first and second intake pipes; a choke positioned in one of the first intake pipe and the second intake pipe; an exhaust gas chamber operable to flow-connect the first and the second exhaust manifolds upstream of the exhaust gas turbines in an exhaust gas flow; a throttle valve arranged in the exhaust gas chamber and operable to assume a closed position to separate the first and the second exhaust manifolds, the throttle valve being operable to selectively flow-connect the first exhaust manifold to the first exhaust gas turbine when the engine is cold or is in a first engine speed range (I); an exhaust passage situated downstream in the gas flow of the first and the second exhaust gas turbines; an exhaust duct leading from the exhaust gas chamber to the exhaust passage; and a regulating valve arranged in the exhaust duct and operable for regulating the exhaust gas flow through the exhaust duct.