Internal-combustion engines – Charge forming device – Supercharger
Patent
1998-05-29
2000-12-12
Kamen, Noah P.
Internal-combustion engines
Charge forming device
Supercharger
123563, F02B 3300
Patent
active
061584223
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a supercharging arrangement for the charge air of an internal combustion engine.
2. The Prior Art
From JP 01 060 717 A a supercharging arrangement for the charge air of an internal combustion engine, in particular of a piston engine, is known which is arranged as a pressure wave machine which is flow-connected with an air-inlet line for the charge air and an exhaust gas line for the combustion gases of the piston engine. The pressure wave machine is provided with a housing which is formed by a charge air face housing, an exhaust gas face housing and a housing part which mutually distances the same. The housing, in particular the charge air face housing and exhaust gas face housing, is provided with flow-in and flow-off ducts. A cell rotor is disposed in the housing which is rotatably held in a bearing arrangement and is provided with several paths of flow which are arranged concentrically with respect to one another and is connected with a rotary drive. Switching members are arranged in the exhaust gas face housing in flow-in ducts for the combustion gases to the paths of flow. The disadvantage in this respect is that a pressure-charged path of flow is flow-connected on the charge air side with flow-off ducts by way of flow-off ducts assigned to the same and the air-inlet line, which flow-off ducts are assigned to a path of flow which is not charged with pressure. In this way the charge air which is compressed via the pressure waves of the combustion gases cannot only penetrate the air-inlet line for the charge air to the piston engine on reaching the charge air face housing, but can also penetrate the other paths of flow which are not charged with pressure waves for example. This causes an undesirable pressure loss and thus a reduction in the efficiency of the pressure wave machine and consequently a more unfavourable controllability of the pressure wave process.
From JP 62 101 850 A a supercharging arrangement for the charge air of a combustion engine is known which is arranged in a flow-connected manner between an air-inlet line for the charge air and an exhaust gas line for the combustion gases. It is arranged as a pressure wave machine and is provided with a cell rotor. The air-inlet line for the charge air is provided on the high-pressure side with a switching member which can be used to change the air inlet stream to the internal combustion engine. The disadvantage in this embodiment is that also in the case of using a cell rotor with several paths of flow which are arranged concentrically with respect to one another it is not possible to prevent that compressed charge air is conducted from a path of flow which is in operation, i.e. it is charged with pressure waves, to another path of flow which is not in operation. As already described above, this leads to an undesirable pressure loss.
GB 2 065 232 A and U.S. Pat. No. 3,011,487 A describe an angular offset of inlet and outlet openings in exhaust gas face housings and charge air face housings. This angular offset can be adjusted to the speed of the internal combustion engine.
A device for supercharging an internal combustion engine is known from DE 26 33 568 C2 in which an exhaust gas turbocharger is connected with the gas-dynamic pressure wave machine which is connected in series on the exhaust gas side and air side and causes a supply of the internal combustion engine with fresh air in two stages. The exhaust gas turbocharger is used for the high-pressure stage and the pressure wave machine for the low-pressure stage. This known device further also provides the intermediate heating of the exhaust gas prior to its supply to the pressure wave machine. This device requires a high amount of technical complexity, as a result of which its application in the low and medium output spectrum of internal combustion engines is not favourable.
From DE 28 44 287 C2 a parallel-flow gas-dynamic pressure wave machine is known which is provided with a cell rotor which is rotatably held
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Blank Otto
Buha Gerald
Mayer Andreas
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