Bbc Brown, Boveri & Company, Limited

Bbc Brown Boveri Ag

Francois A Jaussi

Fritz W Spinnler

Andreas Mayer

Reinhard Fried

Ibrahim El-Nashar

Christian Komauer

Hubert Kirchhofer

Josef Perevuznik

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.

Free-running pressure wave supercharger driven by gas forces

The pressure wave supercharger of the internal combustion engine has a diaphragm capsule (20) for controlling the supercharge air butterfly (14). The diaphragm (21) of the diaphragm capsule is, in operation, subjected on the butterfly side to the high pressure air in the high pressure air duct (2) and on the other side to the pressure at the protrusion 27 or in the compression pocket (5), via a control pressure line (26; 28). These pressures typical of the process vary with the speed of the cell rotor and control the setting of the supercharge air flap as a function of the speed and loading condition of the engine.

Internal combustion engine with a pressure wave supercharger

In the control equipment of a pressure wave supercharger for supercharging vehicle internal combustion engines, a precontrol device is provided to actuate the control device, which precontrol device is connected in each case via a precontrol pressure pipe and a control pressure pipe with one or several of the pressure tapping positions located in the region of the supercharge air duct.

Control equipment for a pressure wave supercharger

Growing community of inventors

Wettingen, Switzerland

Francois A Jaussi