Use of sensors in a state observer for a diesel engine
First Claim
1. A control system for controlling a diesel engine using feedback from one or more sensors, the diesel engine including at least one fuel injector, an intake manifold, and an exhaust manifold, the control system comprising:
- one or more post-combustion sensors adapted to directly sense at least one constituent of exhaust gasses emitted from the exhaust manifold of the diesel engine;
a state observer adapted to estimate the internal state of a model relating to at least one parameter of engine performance using signals from said one or more post-combustion sensors; and
a state feedback control algorithm adapted to set at least one actuator setpoint based on the estimated state outputted by the state observer for controlling one or more actuators of the diesel engine.
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Abstract
Systems and methods for controlling an engine using feedback from one or more sensors are disclosed. An illustrative control system for controlling a diesel engine may include one or more post-combustion sensors adapted to directly sense at least one constituent of exhaust gasses emitted from the exhaust manifold of the engine, and a state observer for estimating the internal state of the diesel engine based on feedback signals received from the post-combustion sensors and from subsequent use of the estimated state in a controller that sends the actuator setpoints. The post-combustion sensors can be configured to directly measure emissions such as oxides of nitrogen (NOx) and/or particulate matter (PM) within the exhaust stream, and provide such information to a state observer that, in turn, updates an internal dynamical state based on these measurements. In some cases, other sensors such as a torque load sensor, an in-cylinder pressure sensor, and/or a fuel composition sensor can be further used to update the internal state of the state space model, as needed. Using an estimated state from the state observer, a state feedback controller can compute and adjust various actuator setpoints from values that more accurately represent the true state of the system.
269 Citations
14 Claims
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1. A control system for controlling a diesel engine using feedback from one or more sensors, the diesel engine including at least one fuel injector, an intake manifold, and an exhaust manifold, the control system comprising:
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one or more post-combustion sensors adapted to directly sense at least one constituent of exhaust gasses emitted from the exhaust manifold of the diesel engine; a state observer adapted to estimate the internal state of a model relating to at least one parameter of engine performance using signals from said one or more post-combustion sensors; and a state feedback control algorithm adapted to set at least one actuator setpoint based on the estimated state outputted by the state observer for controlling one or more actuators of the diesel engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a diesel engine using feedback from one or more sensors, the diesel engine including at least one fuel injector, an intake manifold, and an exhaust manifold, the method comprising the steps of:
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directly measuring at least one constituent in the exhaust stream of the engine using one or more post-combustion sensors; providing a state observer including a state space model representation of the diesel engine; determining the internal state of the state space model based in part on feedback signals received from the one or more post-combustion sensors; updating the internal state of the model in the event the true state of the model differs from an estimated state thereof; computing one or more actuator setpoints as a function of the estimated state from the state observer; and adjusting one or more actuator setpoints based on the computed state estimate. - View Dependent Claims (12, 13, 14)
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Specification