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US 11,788,461 B2Granted
Turbocharger control with overspeed protection
AssigneeGarrett Transportation I Inc.
InventorLubomir Baramov
Life of this patent
Estimating the term…
Abstract
Systems and methods for controlling turbocharger operation by maintaining a virtual turbocharger speed calculation using airflow parameters in the context of an engine. An example uses a turbocharger speed estimator, an energy observer, and an energy controller. Optimization of turbocharger speed control, including avoidance of overspeed, while reducing wastegate actuation, can be achieved using a predictive control algorithm.
Claims20
An engine system comprising:
- an engine having an intake manifold and an exhaust manifold;
- a turbocharger having a compressor and a turbine, the compressor being upstream of the intake manifold, the turbine being downstream of the exhaust manifold, wherein the turbocharger is configured obtain power from airflow exiting the exhaust manifold to drive the compressor to compress air to be provided to the intake manifold;
- a wastegate positioned and configured to allow airflow exiting the exhaust manifold to bypass the turbine, the wastegate selectively controllable in a range of opening positions between open and closed;
- a plurality of engine airpath sensors associated with the engine;
- and
- a controller configured to perform the following:
- estimate turbocharger speed using the engine airpath sensors and a model of the engine air path as a function of measured or estimated boost pressure downstream of the compressor, measured or estimated mass flow into the compressor, measured or estimated compressor inlet temperature, and measured or estimated compressor inlet pressure;
- calculate a target turbocharger speed by reference to a target boost pressure;
- and
- control the wastegate to minimize the distance between the target boost pressure and an actual boost pressure, while preventing turbocharger speed from exceeding a predefined maximum speed.
7 more elements
An engine system comprising:
- an engine having an intake manifold and an exhaust manifold;
- a turbocharger having a compressor and a turbine, the compressor being upstream of the intake manifold, the turbine being downstream of the exhaust manifold, wherein the turbocharger is configured obtain power from airflow exiting the exhaust manifold to drive the compressor to compress air to be provided to the intake manifold, the turbine taking the form of a variable nozzle turbine (VNT) selectively controllable in a range of opening positions between open and closed;
- a plurality of engine airpath sensors associated with the engine;
- and
- a controller configured to perform the following:
- estimate turbocharger speed using the engine airpath sensors and a model of the engine air path as a function of measured or estimated boost pressure downstream of the compressor, measured or estimated mass flow into the compressor, measured or estimated compressor inlet temperature, and measured or estimated compressor inlet pressure;
- calculate a target turbocharger speed by reference to a target boost pressure;
- and
- control the VNT to minimize the distance between the target boost pressure and an actual boost pressure, while preventing turbocharger speed from exceeding a predefined maximum speed.
6 more elements
A method of controlling a turbocharger in an engine system that includes:
- an engine having an intake manifold and an exhaust manifold;
- a turbocharger having a compressor and a turbine, the compressor being upstream of the intake manifold, the turbine being downstream of the exhaust manifold, wherein the turbocharger is configured obtain power from airflow exiting the exhaust manifold to drive the compressor to compress air to be provided to the intake manifold;
- a wastegate positioned and configured to allow airflow exiting the exhaust manifold to bypass the turbine, the wastegate selectively controllable in a range of opening positions between open and closed;
- a plurality of engine airpath sensors associated with the engine;
- a controller configured to obtain signals from the engine airpath sensors and control at least the wastegate, the method comprising:
- the controller estimating turbocharger speed using the engine airpath sensors and a model of the engine air path as a function of measured or estimated boost pressure downstream of the compressor, measured or estimated mass flow into the compressor, measured or estimated compressor inlet temperature, and measured or estimated compressor inlet pressure;
- the controller calculating a target turbocharger speed by reference to a target boost pressure;
- and
- the controller issuing command signals to control the wastegate to minimize the distance between the target boost pressure and an actual boost pressure, while preventing turbocharger speed from exceeding a predefined maximum speed.
6 more elements
Dependencies are inferred from the claim text.