摘要:
An exhaust-gas turbocharger for an internal combustion engine has a turbine having a variable turbine geometry for the variable setting of the effective flow inlet cross section to the turbine wheel. The exhaust-gas turbocharger has a compressor which is connected to the turbine via a shaft. The variable turbine geometry can be adjusted by means of a regulating device between a closed position and an open position. To compensate for wear, a stop limiting an end position of the variable turbine geometry is provided, and the position of this stop can be set in a variable manner.
摘要:
In an internal combustion engine including an exhaust gas turbocharger and a compound power turbine connected to the crankshaft of the engine and an exhaust gas recirculation system extending between the engine exhaust duct upstream of the exhaust gas turbine and the intake duct downstream of the compressor of the exhaust gas turbocharger, the exhaust gas turbine and the compound power turbine have a size relationship determined by the power absorption capability &phgr; of each turbine such that: φ = m . T p wherein: {dot over (m)} is the exhaust gas mass flow rate through the turbine, T is the exhaust gas temperature at the turbine inlet, and p is the exhaust gas pressure at the turbine outlet and the maximal compound power turbine absorption capability exceeds the maximal absorption capability of the exhaust gas turbine.
摘要:
An internal combustion engine having an exhaust-gas turbocharger is provided. The exhaust-gas turbocharger includes a variable turbine geometry that allows for a greater range of use. The exhaust-gas turbocharger is used as a throttling device to dimension the combustion-air quantity delivered to the engine. The variable turbine geometry can be adjusted in such a way that the direction of rotation of the rotor of the exhaust-gas turbocharger is reversed. The intake pressure in the air inlet of the internal combustion engine is set as a function of the direction of rotation of the rotor.
摘要:
In a turbocharger system for internal combustion engines, the internal combustion engine has at least one combustion chamber with a variable volume and a swept volume determined by the sum of the differential volumes between the smallest and largest volumes of the combustion chambers of the internal combustion engine. The turbocharger system associated to the internal combustion engine has at least one turbine arranged in the exhaust gas pipe of the internal combustion engine and provided with a flow channel which opens via an annular jet-shaped region onto a turbine wheel. A guiding apparatus arranged in the opening region of the flow channel has a variable guiding grid with adjustable guiding blades which make it possible to obtain free flow sections of different sizes and which acts as a throttle during braking in an adjustable manner, depending on the operational parameters of the internal combustion engine, for determining the narrowest flow section in the exhaust gas pipe that leads to the turbine. The system is characterized in that at maximum braking power the relation between the free flow section A in the exhaust gas pipe that leads to the turbine, the inlet diameter D of the turbine wheel and the swept volume VH of the internal combustion engine is described by the equation (I) when the braking power supplied by the internal combustion engine during braking is at its maximum, the turbo-braking factor (TBF) being smaller than 0.0005 (5%). The internal combustion engine and the turbocharger are matched so as to supply maximum braking power with low thermal stress.
摘要:
An exhaust gas turbocharger for an internal-combustion engine has a turbine wheel which is arranged in a housing of the exhaust gas turbocharger and to which exhaust gas can be fed by way of a flow duct constructed in the housing. A variable baffle is provided for adjusting the flow cross-section of the flow duct. In order to equip the exhaust gas turbocharger with a braking function at low manufacturing and mounting expenditures, the baffle is movably accommodated in a matrix which is detachably held on the housing. The baffle and the matrix form an exchangeable braking module.
摘要:
In an engine braking operation for a supercharged internal-combustion engine which has an exhaust gas turbocharger having a turbine with a variable turbine geometry, the turbine geometry is adjusted between a ram position to reduce the effective turbine cross-section and an opening position to open the effective turbine cross-section. In order to influence the action of the engine brake simply, such that a braking is adapted to different situations, the variable turbine geometry is adjusted between a definable hard braking adjustment and a definable soft braking adjustment. The hard braking adjustment is situated between the ram position and a drive starting position assigned to the fired drive operating mode. The soft braking adjustment is situated between the drive starting position and the opening position. The hard braking adjustment is selected so that the engine braking power is higher than in the soft braking adjustment.
摘要:
In an exhaust gas re-circulation arrangement for a supercharged internal combustion engine including an exhaust gas turbocharger with an exhaust gas turbine and a compressor, first and second exhaust pipes extending from the engine separately to the exhaust gas turbine, a charge air duct extending from the compressor to the engine and an exhaust gas recirculation line extending from one of the exhaust pipes upstream of the exhaust gas turbine to the charge air duct downstream of the compressor, the exhaust gas turbine has two turbine inlet flow passages, which provide for different flow volumes and to each of which one of the exhaust pipes is connected and a control arrangement is provided for controlling the exhaust gas flow through the turbine inlet flow passages so as to control the pressure in the exhaust gas re-circulation line to be higher than in the charge air intake duct.
摘要:
A radial-flow exhaust-gas turbocharger turbine is provided with a row of adjustable guide blades which are rotatable via adjusting shafts mounted in a casing. The guide blades are each provided with sealing discs on their longitudinal sides running at right angles to the adjusting-shaft axes. The diameter of the sealing discs is a multiple of the thickness of the guide blades. The sealing discs which are located on the side remote from the adjusting shafts form bearing points for the guide blades in the casing.
摘要:
In a method and apparatus for controlling a supercharged internal combustion engine including an exhaust gas turbocharger having variable turbine inlet vanes, an engine control unit includes an engine performance graph with control parameters for a multitude of engine operating points compressor performance graph is also recorded in the engine performance which represents for various exhaust gas turbocharger speeds a particular relationship between mass flow through the compressor and total pressure ratio. A multitude of engine operating curves for constant turbine guide vane positions and constant engine speeds for various engine loads and engine operating modes are also recorded and retrieved by the engine control unit for controlling the engine depending on desired engine load and engine speed for adjusting the turbine inlet vanes.
摘要:
In the engine braking operation of supercharged internal combustion engines, the braking power is generated by backing-up the exhaust gas before it enters an exhaust gas turbine of an exhaust gas turbocharger from an actuator in the exhaust gas duct. In order to make it possible to control the braking power within the operating limits of the exhaust gas turbocharger, the actual value and a maximum value of the turbine inlet pressure within the operating limits of the exhaust gas turbo supercharger are inferred from a performance graph of the internal combustion engine, which performance graph includes an electronically stored compressor performance graph of the supercharged air compressor which represents the relationship between mass throughput and total pressure ratio of the compressor and in which a plurality of engine operating lines for certain actuator positions and certain engine speeds as well as for a constant turbine inlet pressure are recorded. The maximum value arises as a function of the engine speed from a characteristic rotational speed line stored in the performance graph. Corresponding to the desired braking power, a nominal value which, together with the actual value of the turbine inlet pressure, serves in the control circuit as an inlet parameter for an engine controller for a comparison of nominal and actual values, is determined proportionally from the maximum value.