Engine Pre Turbine Pressure Monitoring System
AssigneeDAF Trucks N.V.
InventorsLuc Hubertus Josephina Worms, Maarten Robertus Ingmar Nieuwenhuijze
Life of this patent
Estimating the term…
Abstract
A pressure monitor is arranged to calculate a pre turbine pressure (p3). The monitor is programmed to: derive a normalized turbine speed, normalized for a pre turbine temperature, and a heat capacity ratio of exhaust gas before the turbine as first inputs; determine a turbine power normalizing factor as a second input; determine an actual turbocompressor power value as a third input; derive, for said first inputs, a linear relation between a turbine expansion ratio and a turbine power value normalized by the second input; equate the turbine power value to the actual turbocompressor power; thereby deriving the pre turbine pressure from said linear relation, as an output.
Claims7
An internal combustion engine comprising:
- an inlet manifold providing compressed inlet air into a plurality of cylinders;
- an exhaust manifold for exhausting combusted gases from the plurality of cylinders;
- a turbine provided in an exhaust channel coupled to the exhaust manifold;
- a turbocompressor provided in an inlet channel coupled to the inlet manifold;
- a pressure monitor arranged to calculate a pre turbine pressure (p3), wherein the pressure monitor is programmed to:
- derive a normalized turbine speed, normalized for a pre turbine temperature, and a heat capacity ratio of exhaust gas before the turbine as first inputs;
- determine a turbine power normalizing factor as a second input;
- determine an actual turbocompressor power value as a third input;
- derive, for said first inputs, a linear relation between a turbine expansion ratio and a turbine power value normalized by the second input;
- equate the turbine power value to the actual turbocompressor power;
- thereby deriving the pre turbine pressure from said linear relation, as an output.
A method for monitoring a pre turbine pressure of in internal combustion engine comprising a turbine provided in an exhaust channel coupled to an exhaust manifold and a turbo compressor provided in an inlet channel coupled to an inlet manifold of the internal combustion engine;
- the method comprising
- deriving a turbine speed, normalized for a pre turbine temperature, and a heat capacity ratio of exhaust gas before the turbine as first inputs;
- determining a turbine power normalizing factor as a second input;
- determining an actual turbocompressor power value as a third input;
- deriving, for said first inputs, a linear relation between a turbine expansion ratio and a turbine power value normalized by the second input;
- equating the turbine power value to the actual turbocompressor power;
- thereby deriving the pre turbine pressure from said linear relation, as an output.
Dependencies are inferred from the claim text.