Method and apparatus for controlling turbine efficiency

Abstract

A method of controlling turbine efficiency in a turbo unit provided on an internal combustion engine includes providing a flow of gas in an area upstream a turbine at a direction different to the flow of exhaust gases in the same area, regulating the flow by a valve, and controlling the valve from a control unit having at least boost pressure and/or EGR flow as input parameters.

1 . A method of controlling turbine efficiency in a turbo unit for an internal combustion engine, comprising:
 providing a flow of gas in an area upstream a turbine rotor at a direction different to the flow of exhaust gases in the same area,   regulating the flow by a valve,   controlling the valve from a control unit having at least boost pressure and/or EGR flow as input parameters.   
     
     
         2 . The method according to  claim 1 , further comprising providing in the area a plurality of outlets for the flow of gas. 
     
     
         3 . The method according to  claim 2 , further comprising providing an on-off valve in each of the outlets. 
     
     
         4 . The method according to  claim 2 , further comprising providing a variable valve in each of the outlets. 
     
     
         5 . The method according to  claim 1 , further comprising providing the valve outside a turbo unit housing. 
     
     
         6 . The method according to  claim 1 , further comprising integrating the valve in a turbo unit housing. 
     
     
         7 . The method according to  claim 1 , further comprising:
 providing the flow of gases from a volute of the turbo unit.   
     
     
         8 . The method according to  claim 1 , further comprising:
 providing the flow of gases from an exhaust gas manifold.   
     
     
         9 . The method according to  claim 1 , further comprising:
 providing the flow of gases from an outlet downstream of a compressor of the turbo unit or from an external compressor tank.   
     
     
         10 . The method according to  claim 1 , further comprising:
 providing the turbo unit with adjustable vanes, and   providing the flow of gas in a vane less space at least partially downstream the vanes and upstream the turbine.   
     
     
         11 . A system for controlling turbine efficiency in a turbo unit for an internal combustion engine comprising
 at least one outlet arranged in a turbine scroll outlet for providing a flow of gas in a direction different to the direction of exhaust gases in the turbine scroll outlet;   a valve arranged between a source for providing a flow of gas and the outlet in the turbine scroll outlet for regulating the flow of the gas; and   a control unit for controlling the valve where the control unit has at least boost pressure and/or EGR flow as input parameters.   
     
     
         12 . The system according to  claim 11 , wherein one valve is provided upstream each outlet and where the valve may be of on-off type or continuously variable. 
     
     
         13 . The system according to  claim 11 , wherein at least one of the valves is provided outside a housing of the turbo unit 
     
     
         14 . The system according to  claim 11 , wherein at least one of the valves is integrated in a housing of the turbo unit. 
     
     
         15 . The system according to  claim 11 , wherein the source for providing ‘a flow of gas is one of the group of: exhaust gases from the internal combustion engine, boost pressure from the compressor of the turbo unit, air pressure tank. 
     
     
         16 . The system according to  claim 11 , wherein the turbo unit comprises adjustable vanes and where the at least one outlet for providing the flow of gas into the turbine scroll outlet is provided in a vane less space at least partially downstream the vanes and upstream the turbine. 
     
     
         17 . A vehicle comprising a system according to  claim 11 .