Approach and system for handling constraints for measured disturbances with uncertain preview
First Claim
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1. An engine subsystem control system comprising:
- a mechanism for measuring disturbances variables of automotive control subsystems;
a model predictive controller that provides model predictive control of the automotive control subsystems to achieve prescribed performance while maintaining controlled variables within prescribed limits based on measurements of the disturbance variables and the controlled variables, the model predictive controller is connected to the mechanism for measuring disturbance variables and is configured to receive values from the mechanism based on the measurements of the disturbance variables; and
wherein;
the disturbance variables are uncertain over a prediction horizon;
the model predictive controller provides estimates of the disturbance variables over the prediction horizon;
the model predictive controller adjusts a range between limits on the disturbance variables based on the measurements of the disturbance variables-during operation of the automotive control subsystems; and
the model predictive controller adjusts automotive control subsystem operations to achieve the prescribed performance based on the adjusted range between limits on the disturbance variables.
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Abstract
An approach and system for robust constraints handling for measured disturbances with uncertain preview on a prediction horizon in model predictive control with application in automotive control systems A constraints handling system may incorporate a mechanism for measuring disturbances of automotive control subsystems, a model predictive controller that provides model predictive control, connected to the a mechanism for measuring disturbances, and a sensor subsystem that collects information about an uncertainty of measured disturbances. The disturbances may have an uncertain preview over a prediction horizon. Estimates for the disturbances may be made of the preview.
493 Citations
13 Claims
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1. An engine subsystem control system comprising:
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a mechanism for measuring disturbances variables of automotive control subsystems; a model predictive controller that provides model predictive control of the automotive control subsystems to achieve prescribed performance while maintaining controlled variables within prescribed limits based on measurements of the disturbance variables and the controlled variables, the model predictive controller is connected to the mechanism for measuring disturbance variables and is configured to receive values from the mechanism based on the measurements of the disturbance variables; and wherein; the disturbance variables are uncertain over a prediction horizon; the model predictive controller provides estimates of the disturbance variables over the prediction horizon; the model predictive controller adjusts a range between limits on the disturbance variables based on the measurements of the disturbance variables-during operation of the automotive control subsystems; and the model predictive controller adjusts automotive control subsystem operations to achieve the prescribed performance based on the adjusted range between limits on the disturbance variables. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for controlling subsystems of an engine, comprising:
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a vehicle having an engine; one or more subsystems associated with the engine; and a model predictive controller that provides model predictive control for the one or more subsystems to achieve prescribed performance while maintaining controlled variables within prescribed limits based on disturbance variables of the vehicle and the controlled variables; and wherein; the one or more subsystems have controlled variables to be maintained within a range of limits by the model predictive controller; the disturbance variables have uncertainties; the model predictive controller approximates uncertainties of selected disturbance variables on the prediction horizon and reduces an original prescribed range between limits on the selected disturbance variables over the prediction horizon based on measurements of the disturbance variables during operation of the vehicles; and the model predictive controller controls operation of the one or more subsystems associated with the engine based on the reduced range between limits for the selected variables. - View Dependent Claims (9, 10)
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11. A method for controlling subsystems of an engine, comprising:
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controlling one or more subsystems of an engine with model predictive controller to achieve prescribed performance while maintaining controlled variables within prescribed limits based on disturbance variables and the controlled variables; previewing uncertainties of disturbance variables of the one or more control subsystems over a prediction horizon in the model predictive controller; using the model predictive controller to adjust the one or more control subsystems based the disturbance variables of the control subsystems under conditions having initial constraints in an absence of the uncertainties of the disturbance variables over the prediction horizon; estimating an uncertainty range of the disturbance variables over the prediction horizon with the model predictive controller when the disturbance variables have uncertainties over the prediction horizon; offsetting the constraints of the disturbance variables by approximating uncertainties of the disturbance variables on the prediction horizon based on measurements of the disturbance variables during operation of the engine, and thus reducing an original range between limits on the disturbance variables on the prediction horizon; and adjusting, with the model predictive controller, the one or more control subsystems based on the offset constraints of the disturbance variables. - View Dependent Claims (12, 13)
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Specification