Patent ID: 7523736

Claim:
A device for increasing the braking power of a multi-cylinder internal combustion engine of a vehicle during an engine braking operation and having an engine braking device internal to the engine and a charge air compressor mechanism, comprising: a single or multi-stage turbosupercharger including an exhaust gas turbine for each stage; two exhaust gas header pipes, wherein exhaust gas discharged from a plurality of the cylinders, combined in groups, is respectively adapted to be conveyed via said exhaust gas header pipes to an inlet of the exhaust gas turbine; and a respective throttle valve for each of said exhaust gas header pipes, wherein each exhaust gas header pipe is adapted to be blocked by one of said throttle valves during an engine braking operation, wherein a respective bypass line branches off from a region of each of said exhaust gas header pipes that is adapted to be blocked, wherein each of said bypass lines communicates with a nozzle bore formed in a wall of the exhaust gas turbine, wherein said nozzle bores are disposed in a plane that extends perpendicular to an axis of a turbine wheel that is disposed in a chamber of the exhaust gas turbine, wherein said nozzle bores either a) extend parallel next to one another and have respective outlets adjacent to one another, or b) extend at an acute angle to one another, merge with one another, and have a common outlet, wherein said nozzle bores open out, via said respective outlets or said common outlet, into said turbine chamber, where said nozzle bores are directed tangentially onto an outer portion of said turbine wheel, wherein by means of said bypass lines, during an engine braking operation, two partial exhaust gas streams are adapted to be branched off from exhaust gas retained in blocked ones of said exhaust gas header pipes, wherein via said nozzle bores said partial exhaust gas streams, either in the form of two exhaust gas streams or combined to a single exhaust gas stream, are then adapted to strike blades of said turbine wheel at high pressure and at high speed, whereupon said turbosupercharger is adapted to be driven in an accelerated manner and consequently compressed air is adapted to be supplied to combustion chambers of said internal combustion engine and is there effective to increase braking power.