Passive nitric oxide storage catalyst management
AssigneeGM Global Technology Operations LLC
InventorsChristopher L. Whitt, Michael A. Smith, Shouxian Ren
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Abstract
According to one or more embodiments described herein, an exhaust system for treating exhaust gas from an internal combustion engine in a motor vehicle includes a passive NOx absorber (PNA) device, and a model-based controller that controls an amount of NOx stored by the PNA device. Controlling of the amount of NOx stored includes computing a predicted NOx storage level of the PNA device using a prediction model of the PNA device, and in response to the predicted NOx storage level of the PNA device being greater than a predetermined cold-start threshold, raising a temperature of the exhaust gas by changing an operation of the internal combustion engine.
Claims14
An exhaust system for treating exhaust gas from an internal combustion engine in a motor vehicle, the exhaust system comprising:
- a passive NOx absorber (PNA) device;
- and
- a model-based controller that is configured to control an amount of NOx stored by the PNA device, the controlling of the amount of NOx stored comprising:
- computing a predicted NOx storage level of the PNA device using a prediction model of the PNA device;
- and
- in response to the predicted NOx storage level of the PNA device being greater than a predetermined cold-start threshold, raising a temperature of the exhaust gas by changing an operation of the internal combustion engine, wherein the raised temperature causes the PNA device to release stored NOx;
- an emissions reduction device that converts the released NOx into nitrogen (N2) and/or water (H2O), wherein a predicted conversion capacity of the emissions reduction device is computed using a prediction model of the emissions reduction device and is based on a predicted amount of NOx in the exhaust gas, wherein in response to the conversion capacity of the emissions reduction device being greater than a predetermined threshold value, raising the temperature of the exhaust gas by changing the operation of the internal combustion engine.
A vehicle system comprising:
- an internal combustion engine;
- a passive NOx absorber (PNA) device;
- and
- a model-based controller that is configured to control an amount of NOx stored by the PNA device, the controlling of the amount of NOx stored comprising:
- computing a predicted NOx storage level of the PNA device using a prediction model of the PNA device;
- and
- in response to the predicted NOx storage level of the PNA device being greater than a predetermined cold-start threshold, raising a temperature of exhaust gas from the internal combustion engine by changing an operation of the internal combustion engine, wherein the raised temperature causes the PNA device to release stored NOx;
- an emissions reduction device that converts the released NOx into nitrogen (N2) and/or water (H2O), wherein a predicted conversion capacity of the emissions reduction device is computed using a prediction model of the emissions reduction device and is based on a predicted amount of NOx in the exhaust gas, wherein in response to the conversion capacity of the emissions reduction device being greater than a predetermined threshold value raising the temperature of the exhaust gas by changing the operation of the internal combustion engine.
A computer-implemented method for controlling an amount of NOx stored by a passive NOx absorber (PNA) device, the method comprising:
- absorbing, by the PNA device, NOx from exhaust gas released by an internal combustion engine;
- computing, by a controller, a predicted NOx storage level of the PNA device using a prediction model of the PNA device;
- and
- in response to the predicted NOx storage level of the PNA device being greater than a predetermined cold-start threshold, raising a temperature of the exhaust gas by changing, by the controller, an operation of the internal combustion engine, wherein the raised temperature causes the PNA device to release stored NOx;
- converting, by an emissions reduction device, the released NOx into nitrogen (N2) and/or water (H2O), wherein a predicted conversion capacity of the emissions reduction device is computed using a prediction model of the emissions reduction device and is based on a predicted amount of NOx in the exhaust gas, wherein in response to the conversion capacity of the emissions reduction device being greater than a predetermined threshold value raising the temperature of the exhaust gas by changing the operation of the internal combustion engine.
Dependencies are inferred from the claim text.