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:
An exhaust gas turbocharger for an internal combustion engine comprises a turbine in the exhaust line and a compressor, which is driven by the turbine and which is located inside the intake tract of the internal combustion engine. The turbine comprises a flow duct having a radial flow entrance cross-section, and a flow ring is provided that delimits the flow entrance cross-section. An adjustable vane is placed in the radial flow entrance cross-section for variably adjusting this flow entrance cross-section. The flow ring inside the housing of the exhaust gas turbine can be axially displaced between a contact position toward the vane and a position that frees a gap toward the vane.
摘要:
An exhaust gas turbocharger for an internal combustion engine comprises a turbine in the exhaust line and a compressor, which is driven by the turbine and which is located inside the intake tract of the internal combustion engine. The turbine comprises a flow duct having a radial flow entrance cross-section, and a flow ring is provided that delimits the flow entrance cross-section. An adjustable vane is placed in the radial flow entrance cross-section for variably adjusting this flow entrance cross-section. The flow ring inside the housing of the exhaust gas turbine can be axially displaced between a contact position toward the vane and a position that frees a gap toward the vane.
摘要:
A compressor in a turbocharger has a compressor impeller in an inflow passage and an outflow region downstream of the compressor-impeller outlet edge. The outflow region is assigned a connecting passage, a stabilizing chamber and an outflow passage, the connecting passage being arranged with a lateral offset with respect to a longitudinal center axis of the stabilizing chamber.
摘要:
In a multi-cylinder internal combustion engine including an exhaust gas turbocharger to which at least two separate exhaust lines extend from different groups of cylinders of the engine, the exhaust lines have discharge openings arranged adjacent one another along a control surface area and a control slide member supported so as to be movable relative to the exhaust gas discharge openings includes wall portions movable with the slide member between a position in which the wall portions of the slide member are in alignment with stationary wall portions between the discharge openings for maintaining the exhaust gas flow passages separated from one another and a position in which the wall portions on the slide member are out of alignment with the stationary wall portions, wherein the exhaust gas lines are in communication with one another.
摘要:
An exhaust turbocharger for an internal combustion engine has a main compressor for compressing the fresh air supplied to the engine, an additional compressor for compressing combustion gases to be recycled to the engine, and a turbine that can be driven by the exhaust gases from the engine and which serves to drive the main compressor and the additional compressor. The turbine has an adjustable geometry which facilitates optimization of engine operation regarding pollutant emissions, fuel consumption, and performance.
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.
摘要:
An exhaust gas turbine portion of a vehicle engine turbocharger is provided with at least one variable guide-blade cascade with guide blades in a nozzle opening to the turbocharger rotor for effectively changing the cross section of the exhaust flow to the rotor wherein the angle of the guide blades is selectively settable by an adjusting device. The width dimension of the gap between the ends of the guide-blade cascade and the casing wall defining the nozzle is adjustable between a substantially zero gap dimension and a maximum gap dimension.
摘要:
An exhaust gas turbocharger for an internal-combustion engine, whose exhaust gas turbine has a rotor disk with at least one semiaxial and one radial flow inlet cross-section, and is provided with a variable turbine geometry for the variable adjustment of at least one flow inlet cross-section. Furthermore, a compressor is provided in the intake system of the internal-combustion engine. In order to improve the efficiency of the exhaust gas turbocharger in a wide operating range, the ratio of the compressor outlet diameter to the average turbine inlet diameter can be variably adjusted according to the adjustment of the variable turbine geometry between a minimal value and a maximal value, the minimal value being lower than 1.1.