摘要:
An exhaust-gas turbocharger for an internal combustion engine has an exhaust-gas turbine in the exhaust tract and a compressor in the intake tract, the exhaust-gas turbine and the compressor being connected via a shaft which is supported in a casing of the exhaust-gas turbocharger via at least one bearing. In order to improve the efficiency of the turbocharger, the bearing has a non-contact design, in that, when the exhaust-gas turbocharger is in operation, the shaft is held at a distance from, and so as to be virtually free of friction with, a bearing receptacle fixed to the casing.
摘要:
An exhaust gas turbocharger with an exhaust gas turbine and a radial compressor includes an impeller which pumps air through guide vanes or wedge guide elements into a helical passage. It is proposed that the guide vanes or wedge vane elements be guided for axial displacement in the casing of the radial compressor and be able to be shifted across the pumped stream of the impeller.
摘要:
In an engine braking method and an internal combustion engine including an engine braking arrangement, wherein the engine has high pressure and low pressure exhaust gas turbochargers connected in series, with a bypass (12) around the high-pressure compressor allowing the air mass flow selectively to bypass the high pressure compressor which is arranged near the engine, and bypasses around both turbines permitting the exhaust gas mass flow selectively to bypass the high-pressure exhaust gas turbine which is near the engine and also the low pressure turbine the intake air and the exhaust gas flow are controlled so as to accurately provide for a desired engine braking power for example for maintaining a desired vehicle speed.
摘要:
In an engine braking method and an internal combustion engine including an engine braking arrangement, wherein the engine has high pressure and low pressure exhaust gas turbochargers connected in series, with a bypass (12) around the high-pressure compressor allowing the air mass flow selectively to bypass the high pressure compressor which is arranged near the engine, and bypasses around both turbines permitting the exhaust gas mass flow selectively to bypass the high-pressure exhaust gas turbine which is near the engine and also the low pressure turbine the intake air and the exhaust gas flow are controlled so as to accurately provide for a desired engine braking power for example for maintaining a desired vehicle speed.
摘要:
In a method for operating a supercharged internal combustion engine, the exhaust gas turbine of which is equipped with a variable turbine geometry, if the pressure upstream of the compressor is higher than the pressure downstream of the compressor in the lower load/speed of the internal combustion engine, the variable turbine geometry is adjusted in the direction of its back-up position until the turbine efficiency is at least approximately in the region of the optimum efficiency.
摘要:
In a compressor of a turbocharger of an internal combustion engine comprising a housing with an inflow channel; a compressor impeller arranged in the inflow channel; and a bypass channel which has a first flow opening upstream of the compressor impeller inlet, a second flow opening downstream of the compressor impeller inlet and an axial annular chamber which connects the first and the second flow openings. An axial vane structure is provided in the axial annular chamber of the bypass channel, which imparts a swirl direction corresponding to that of the air mass flow in the inflow channel to the air mass flowing through the bypass channel from the second to the first flow opening.
摘要:
The invention relates to a diesel internal combustion engine with an exhaust treatment device for the reduction of nitrogen oxides and with a fuel injection system comprising a high-pressure pump and at least one solenoid valve-controlled injection nozzle. The injection nozzle is actuated by an electronic control unit and is intended both for the primary injection, provided for the combustion, and for the additional injection, influencing the effectiveness of the exhaust treatment device. The fuel injection nozzle provided for the primary injection also provides for the secondary injection. The secondary injection takes place as a supplementary injection at the earliest in the region of the end phase of the combustion after the ignition top dead center.
摘要:
In a compressor of a turbocharger of an internal combustion engine comprising a housing with an inflow channel; a compressor impeller arranged in the inflow channel; and a bypass channel which has a first flow opening upstream of the compressor impeller inlet, a second flow opening downstream of the compressor impeller inlet and an axial annular chamber which connects the first and the second flow openings. An axial vane structure is provided in the axial annular chamber of the bypass channel, which imparts a swirl direction corresponding to that of the air mass flow in the inflow channel to the air mass flowing through the bypass channel from the second to the first flow opening.
摘要:
In an exhaust gas turbocharger for an internal combustion engine having air intake ducts and exhaust gas discharge ducts including a compressor and a turbine with at least two inlet flow passages, a flow adjusting device (15) arranged in the exhaust gas discharge ducts upstream of the turbine and including a rotary slide valve for controlling the exhaust gas flow first and second flow channels extending through the rotary slide, a third flow channel extends axially partially through the rotary slide valve via inlet openings at the circumference of the rotary slide which can be brought into overlapping relationship with rotary slide housing openings for controlling the exhaust gas flow from the engine to the turbine.
摘要:
In an exhaust gas turbocharger for an internal combustion engine having air intake ducts and exhaust gas discharge ducts including a compressor and a turbine with at least two inlet flow passages, a flow adjusting device (15) arranged in the exhaust gas discharge ducts upstream of the turbine and forming a flow adjusting device having a rotary slide disposed in a rotary slide housing whereby a flow connection can be established or blocked between the flow adjusting device and a turbine inlet flow passage by means of the rotary slide (19), the rotary slide valve has first and second flow channels transversely extending through the rotary slide, a third flow channel which extends axially partially through the rotary slide and having at least two inlet openings at the circumference of the rotary slide which can be brought into overlapping relationship with rotary slide housing openings of an axial end of the rotary slide for controlling the exhaust gas flow from the engine to the turbine or, via a by-pass duct, past the turbine