OPTIMIZING SYSTEM PERFORMANCE USING STATE OF HEALTH INFORMATION
First Claim
1. A method for controlling a system having a plurality of components, the method comprising:
- determining, via a controller, a normalized state of health (SOH) value for each of the components, wherein a normalized SOH value of 1 corresponds to a calibrated or new component and a normalized SOH value of 0 corresponds to a non-functioning component;
determining a state of function (SOF) value of the system as a function of the SOH value of each of the components;
estimating a remaining useful life of the system using the SOF value of the system;
estimating a plurality of different component-level costs via a component-level costing model, wherein each component-level cost is an estimated cost of extending the life of a respective one of the components;
determining, via a system-level costing model, a cost of each of a plurality of different control strategies as a function of the estimated component-level costs;
selecting a control strategy from the plurality of different control strategies which minimizes operating costs while producing a threshold SOF value and a threshold remaining useful life of the components; and
dynamically executing the selected control strategy via the controller.
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Abstract
A method for optimizing performance of a system includes determining, via a controller, a state of health (SOH) for each of a plurality of components of the system, and determining a state of function (SOF) of the system using the SOH of each component. The method includes estimating the remaining useful life (RUL) of the system using the system SOF, selecting a cost-optimal control strategy for the system using a costing model, and dynamically, i.e., in real time, executing the selected strategy to extend the estimated RUL. The method may include comparing the selected cost-optimal strategy to a calibrated performance threshold, and executing the selected strategy only when the selected strategy exceeds the threshold. A system includes first and second components and a controller. The controller dynamically executes the above method with respect to the components, which may be a traction motor and battery in one possible embodiment.
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Citations
16 Claims
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1. A method for controlling a system having a plurality of components, the method comprising:
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determining, via a controller, a normalized state of health (SOH) value for each of the components, wherein a normalized SOH value of 1 corresponds to a calibrated or new component and a normalized SOH value of 0 corresponds to a non-functioning component; determining a state of function (SOF) value of the system as a function of the SOH value of each of the components; estimating a remaining useful life of the system using the SOF value of the system; estimating a plurality of different component-level costs via a component-level costing model, wherein each component-level cost is an estimated cost of extending the life of a respective one of the components; determining, via a system-level costing model, a cost of each of a plurality of different control strategies as a function of the estimated component-level costs; selecting a control strategy from the plurality of different control strategies which minimizes operating costs while producing a threshold SOF value and a threshold remaining useful life of the components; and dynamically executing the selected control strategy via the controller. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a system having a plurality of components, the method comprising:
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using a sensor array to measure and record a set of current performance values for each of the components; calculating, via a controller, a normalized state of health (SOH) value for each of the components by processing the recorded current performance values through an SOH model, wherein a normalized SOH value of 1 corresponds to a calibrated or new component and a normalized SOH value of 0 corresponds to a non-functioning component; determining a state of function (SOF) value of the system using an SOF model that models an SOF value of the system as a function of the corresponding SOH value of each of the components; estimating the remaining useful life of the system using the SOF value of the system using an aging model; processing a set of possible system control strategies through a component-level costing model to thereby estimate the cost of extending the life of a respective one of the components via each of the set of possible system control strategies; determining, via a system-level costing model, a cost of each of a plurality of different control strategies as a function of the estimated component-level costs; selecting a system control strategy from the set of possible system control strategies which minimizes operating costs of the system while producing a threshold SOF value and a threshold remaining useful life of the components; and dynamically executing the selected control strategy via the controller. - View Dependent Claims (8, 9, 10, 11)
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12. A system comprising:
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a first component; a second component; a controller in communication with each of the first and second components, wherein the controller is configured to; determine a normalized state of health (SOH) value for each of the first and second components, wherein a normalized SOH value of 1 corresponds to a calibrated or new component and a normalized SOH value of 0 corresponds to a non-functioning component; determine a state of function (SOF) value of the system as a function of the SOH value of each of the components; estimate the remaining useful life of the system using the SOF value of the system; estimate a plurality of different component-level costs via a component-level costing model, wherein each component-level cost is an estimated cost of extending the life of a respective one of the components; process a set of control strategies through a component-level costing model to thereby estimate the cost of extending the life of a respective one of the components via-each of the set of possible system control strategies; determining, via a system-level costing model, a cost of each of a plurality of different control strategies as a function of the estimated component-level costs; select a system control strategy from the set of possible system control strategies which minimizes operating costs of the system while producing a threshold SOF value and a threshold remaining useful life of the components; and dynamically execute the selected control strategy. - View Dependent Claims (13, 14, 15, 16)
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Specification