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US 11,687,071 B2Granted
Methods of health degradation estimation and fault isolation for system health monitoring
AssigneeGarrett Transportation I Inc.
InventorsTomas Poloni, Paul Dickinson, Jaroslav Pekar
Life of this patent
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Abstract
Methods and systems for fault identification and mitigation in an engine system. A state observer obtains current state information from the engine system, and a feature calculator uses data obtained from the state observer to calculate one or more feature indicators, which are monitored by a health estimator for the occurrence of a change using one or more change probability models. When the health estimator identifies a change, a fault isolator determines a component of the engine system that is subject to fault or health deterioration.
Claims14
A system comprising a physical plant comprising:
- an engine having an intake manifold and an exhaust manifold, with a combustion chamber therebetween into which a fuel quantity is provided;
- an airflow system coupled to the engine, the airflow system having a turbocharger with a compressor and a twin scroll turbine, an exhaust gas recirculation (EGR) valve, a first exhaust airpath from the exhaust manifold to a first scroll of the turbine, a second exhaust airpath from the exhaust manifold to a second scroll of the turbine and a balance valve controllably allowing airflow between the first and second exhaust airpaths;
- and
- an aftertreatment system coupled to the airflow system downstream of the turbine;
- and
- a configurable controller for controlling the physical plant having associated therewith a plurality of actuators for controlling operation of the physical plant and a plurality of sensors for observing a plurality of characteristics of the physical plant operations, the configurable controller comprising:
- a state observer configured to capture the current state of the physical plant by communication with the plurality of sensors;
- a feature calculator configured to receive current state data from the state observer and calculate at least one feature parameter reflecting a state of health of at least one component of the physical plant;
- an optimizer configured to optimize behavior of the physical plant using at least the actuators;
- a health estimator configured to receive the at least one feature parameter from the feature calculator and, subject to one or more entering conditions, apply a change probability model to the at least one feature parameter to determine whether the at least one feature parameter has changed to an extent indicative of a fault or health related degradation and, if so, to generate a change indicator;
- and
- a fault isolator configured to receive the change indicator and identify which component of the physical plant that is subject to a fault or health degradation, and to generate a fault indicator indicating the identified fault;
- wherein the at least one feature parameter comprises:
- a first feature parameter related to mass air flow;
- a second feature parameter related to exhaust manifold air pressure;
- and
- a third feature parameter related to pressure downstream of the turbine.
14 more elements
An engine system comprising:
- an engine having an intake manifold and an exhaust manifold, with a combustion chamber therebetween into which a fuel quantity is provided;
- an airflow system coupled to the engine, the airflow system having a turbocharger including a compressor and a turbine, and an exhaust gas recirculation (EGR) valve;
- an aftertreatment system including a Lambda sensor;
- and
- a configurable controller for controlling the engine, the airflow system, and the aftertreatment system, comprising:
- a state observer configured to capture the current state of the engine, airflow system, and aftertreatment system;
- a feature calculator configured to calculate a first feature parameter related to mass airflow, a second feature parameter related to exhaust manifold air pressure, and a third feature parameter related to pressure downstream of the turbine using data received from the state observer;
- an optimizer configured to optimize behavior of the engine, airflow system, and aftertreatment system using the current state of the engine and at least one model or setpoint;
- a health estimator configured to receive the first, second and third feature parameters and, subject to one or more entering conditions, apply a change probability model to the first, second, and third feature parameters to determine whether any of the first, second or third feature parameters has changed to an extent indicative of a fault and, if so, to generate a change indicator;
- and
- a fault isolator configured to receive the change indicator and identify a fault by identifying a system component that is subject to a fault as indicated by the change indicator, and generate a fault indicator indicating the identified fault;
- wherein the fault isolator is configured to:
- identify an aftertreatment fault if only the third feature parameter has changed;
- or
- identify an EGR fault if either one, or both of, the first and second feature parameters have changed;
- wherein the optimizer is configured to use each of:
- a first model related to aftertreatment airflow;
- and a second model related to EGR flow;
- and
- the system further comprises a health mitigator configured to modify operation of the optimizer to:
- replace or reduce reliance on the first model responsive to an identified aftertreatment fault;
- and replace or reduce reliance on the second model responsive to an identified EGR fault.
19 more elements
An engine system comprising:
- an engine having an intake manifold and an exhaust manifold, with a combustion chamber therebetween into which a fuel quantity is provided;
- an airflow system coupled to the engine, the airflow system having a turbocharger having a compressor and a twin scroll turbine, an exhaust gas recirculation (EGR) valve, a first exhaust airpath from the exhaust manifold to a first scroll of the turbine, a second exhaust airpath from the exhaust manifold to a second scroll of the turbine and a balance valve controllably allowing airflow between the first and second exhaust airpaths;
- an aftertreatment system including a Lambda sensor;
- and
- a configurable controller for controlling the engine, the airflow system, and the aftertreatment system, comprising:
- a state observer configured to capture the current state of the engine, airflow system, and aftertreatment system;
- a feature calculator configured to calculate a first feature parameter related to mass air flow, a second feature parameter related to exhaust manifold air pressure, and a third feature parameter related to pressure downstream of the turbine using data obtained from the state observer;
- an optimizer configured to optimize behavior of the engine, airflow system, and aftertreatment system based on the current state of the engine and at least one model or setpoint;
- a health estimator configured to receive the first, second and third feature parameters and, subject to one or more entering conditions, apply a change probability model to the first, second, and third feature parameters to determine whether any of the first, second or third feature parameters has changed to an extent indicative of a fault and, if so, to generate a change indicator;
- and
- a fault isolator configured to receive the change indicator and identify a fault by identifying a system component that is subject to a fault and generate a fault indicator indicating the identified fault.
8 more elements
Dependencies are inferred from the claim text.