Internal-combustion engines – Charge forming device – Supercharger
Patent
1987-02-11
1989-01-10
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
417 64, F02B 3342
Patent
active
047965959
ABSTRACT:
In a free-running pressure wave supercharger driven by the gas forces, nozzles (27) are provided in the gas casing (6) and possibly also in the air casing (5), which nozzles are connected--via a drive line (26)--with a position in the air casing (5), preferably with the high-pressure air port (2), at which position a surplus pressure relative to the nozzle entry occurs during the run-up phase of the pressure wave supercharger. A control device 15 actuates a supercharge air flat (14) in the port (2) and a valve device (23+25) in the drive line (26) in the opposite sense, i.e. if the supercharge air flap (14) holds the port (2) closed, the valve device (23+25) frees the flow through the drive line (26) to the nozzle (27) and vice versa. The diaphragm capsule (17) of the control device (15) is subjected, on one side, to the pressure in a compression pocket (11) via a control pressure line (19) and, on the other side, to the pressure before the supercharge air flap (14) in the port (2). During the run-up phase, the pressure in the compression pocket (11) exceeds the pressure in front of the supercharge air flap (14) and the nozzle (27) receives drive air. As soon as the pressure in front of the supercharge air flap (14) exceeds the pressure in the compression pocket (11), the supercharge air flap (14) opens and simultaneously closes the valve device (23+25). The nozzle (27) is switched off and the further drive is then mainly provided by the high-pressure exhaust-gas jet from the port (3) entering obliquely to the direction of the rotor peripheral velocity.
REFERENCES:
patent: 2853987 (1958-09-01), Berchtold et al.
patent: 4232999 (1980-11-01), Croes et al.
patent: 4414952 (1983-11-01), Fried et al.
patent: 4662342 (1987-05-01), Altmann et al.
El-Nashar Ibrahim
Jaussi Francois
Kirchhofer Hubert
Komauer Christian
Mayer Andreas
BBC Brown Boveri Ltd.
Koczo Michael
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