Engine pre turbine pressure monitoring system
AssigneeDAF Trucks N.V.
InventorsLuc Hubertus Josephina Worms, Maarten Robertus Ingmar Nieuwenhuijze
Life of this patent
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Abstract
A pressure monitor is arranged to calculate a pre-turbine pressure. 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; and equate the turbine power value to the actual turbocompressor power; thereby deriving the pre turbine pressure from said linear relation, as an output.
Claims12
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 comprising a computing device arranged to calculate a pre turbine pressure (p3), wherein the computing device is programmed to:
- receive data from one or more of the inlet manifold, the exhaust manifold, the turbine, or the turbocompressor;
- derive, based on the data, 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, based on the data, 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;
- generate an output by equating the turbine power value to the actual turbocompressor power, thereby deriving the pre turbine pressure from said linear relation;
- and
- modify, based on the output, an operating parameter of the internal combustion engine.
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 turbocompressor provided in an inlet channel coupled to an inlet manifold of the internal combustion engine, the method comprising:
- receiving data from one or more of the inlet manifold, the exhaust manifold, the turbine, or the turbocompressor;
- deriving, by a computing device and based on the data, a turbine speed, normalized for a pre turbine temperature, and a heat capacity ratio of exhaust gas before the turbine as first inputs;
- determining, by the computing device and based on the data, a turbine power normalizing factor as a second input;
- determining, by the computing device and based on the data, 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;
- generating an output by equating the turbine power value to the actual turbocompressor power;
- thereby deriving the pre turbine pressure from said linear relation, as an output;
- and
- modifying, based on the output, an operating parameter of the internal combustion engine.
Dependencies are inferred from the claim text.