Switch gain scheduled explicit model predictive control of diesel engines
AssigneesToyota Motor Engineering & Manufacturing North America, Inc., The Regents of the University of Michigan
InventorsMike Xuli Huang, Ilya Kolmanovsky
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Abstract
A method for controlling an internal combustion engine using a controller that controls an air flow path by adjusting at least one of a variable geometry turbine (VGT) and an exhaust gas recirculation (EGR) flow rate during engine operation. The method determines inputs, such as engine speed and fuel rate from the sensor data, and employs a switch based gain-scheduled explicit model predictive controller (MPC) responsive to the inputs to determine the air flow path.
Claims17
A method for controlling an internal combustion engine, comprising:
- determining inputs to a controller of the internal combustion engine;
- determining an airflow path using a switch based gain-scheduled explicit model predictive controller (MPC) and based on the inputs;
- and
- adjusting, with the controller, at least one of a variable geometry turbine (VGT) and an exhaust gas recirculation (EGR) flow rate to set the air flow path determined,
- wherein to determine the airflow path, the switched based gain-scheduled explicit MPC employs a gain scheduled matrix for different engine operating conditions and corresponding air flow dynamics, generates a diagonal matrix by extracting the diagonal elements of a gain scheduled matrix, generates an off-diagonal gain matrix by extracting the off-diagonal elements of a gain scheduled matrix, and stores a diagonal and an off-diagonal gain matrix in memory to be used when demanded.
A controller for an internal combustion engine, comprising:
- circuitry programmed to
- determine inputs to the controller, and
- determine an airflow path using a switch based gain-scheduled explicit model predictive controller (MPC) and based on the inputs, and
- adjust at least one of a variable geometry turbine (VGT) and an exhaust gas recirculation (EGR) flow rate to set the air flow path determined,
- wherein to determine the airflow path, the circuitry is further programmed to employ a gain scheduled matrix for different engine operating conditions and corresponding air flow dynamics, generate a diagonal gain matrix by extracting the diagonal elements of the gain scheduled matrix, generate an off-diagonal gain matrix by extracting the off-diagonal elements of the gain scheduled matrix, and store a diagonal and an off-diagonal gain matrix in memory to be used when demanded.
A system, comprising:
- one or more sensors to obtain an internal combustion engine speed and fuel flow rate data;
- and
- a controller including a processor configured to:
- determine a nominal plant behavior model from an off-nominal plant behavior model using switch gain scheduling,
- determine an optimal air flow control action for the off-nominal plant by applying the switch gain scheduling in combination with an explicit model predictive controller (MPC) that is designed for nominal plant operating condition, and
- adjust at least one of a variable geometry turbine (VGT) and an exhaust gas recirculation (EGR) flow rate of the internal combustion engine to set the air flow path determined,
- wherein to determine the airflow path, the controller employs a gain scheduled matrix for different engine operating conditions and corresponding air flow dynamics, generates a diagonal gain matrix by extracting the diagonal elements of the gain scheduled matrix, generates an off-diagonal gain matrix by extracting the off-diagonal elements of the gain scheduled matrix, and stores a diagonal and an off-diagonal gain matrix in memory to be used when demanded.
Dependencies are inferred from the claim text.