Patent application number | Description | Published |
20130245919 | LOW DIMENSIONAL THREE WAY CATALYST MODEL FOR CONTROL AND DIAGNOSTICS - Embodiments for an engine exhaust are provided. In one example, a method comprises adjusting a fuel injection amount based on a fractional oxidation state of a catalyst, the fractional oxidation state based on reaction rates of a plurality of exhaust gas species throughout a catalyst longitudinal axis and a set of axially-averaged mass balance and energy balance equations for a fluid phase and a washcoat of the catalyst. In this way, a simplified catalyst model may be used to control air-fuel ratio. | 09-19-2013 |
20140238348 | HUMIDITY SENSOR DIAGNOSTICS - Embodiments for diagnosing a humidity sensor are provided. One example method comprises, responsive to a humidity sensor test cycle, pumping air conditioning and windshield washer gas flows past a humidity sensor, and indicating humidity sensor degradation based on a response of the humidity sensor to the air conditioning and windshield washer gas flows. In this way, degradation of the humidity sensor may be indicated if the humidity sensed by the humidity sensor does not change responsive to the humidity sensor test cycle being initiated. | 08-28-2014 |
20140238370 | HUMIDITY SENSOR DIAGNOSTICS - Embodiments for diagnosing a humidity sensor are provided. One example method comprises adjusting an engine operating parameter based on humidity of a first gas flow measured by a humidity sensor, and indicating degradation of the humidity sensor if a humidity of a second gas flow measured by the humidity sensor is different than an expected humidity. In this way, degradation of the humidity sensor may be indicated if the humidity of the second gas flow measured by the humidity sensor is different than expected. | 08-28-2014 |
20150204258 | ONE DIMENSIONAL THREE WAY CATALYST MODEL FOR CONTROL AND DIAGNOSTICS - A method comprising adjusting a fuel injection amount based on a fractional oxidation state of a catalyst, the fractional oxidation state based on reaction rates of grouped oxidant and reductant exhaust gas species throughout a catalyst and a low-dimensional physics-based model derived from a detailed two-dimensional model to obtain a one-dimensional model averaged over time and space that accounts for diffusion limitations in the washcoat and accurately predicts emissions during cold start. | 07-23-2015 |
20150233315 | APPROACH FOR ENGINE CONTROL AND DIAGNOSTICS - Embodiments for an engine exhaust are provided. In one example, a method comprises adjusting a fuel injection amount based on a fractional oxidation state of a catalyst, the fractional oxidation state based on reaction rates of a plurality of exhaust gas species throughout a catalyst longitudinal axis and a set of axially-averaged mass balance and energy balance equations for a fluid phase and a washcoat of the catalyst, and further based on feedback from a downstream air-fuel ratio sensor. In this way, a simplified catalyst model may be used to control air-fuel ratio. | 08-20-2015 |
20150233316 | METHOD OF DIAGNOSING AN EXHAUST GAS SENSOR - Embodiments for an engine exhaust are provided. In one example, a method comprises categorizing each respective concentration of a plurality of exhaust gas constituents measured by a gas analyzer into one of oxidants or reductants, the gas analyzer receiving exhaust gas flow from an engine. The method also includes determining an exhaust air-fuel ratio based on the categorized concentrations and validating output from an exhaust gas sensor receiving exhaust gas flow from the engine based on the determined exhaust air-fuel ratio. | 08-20-2015 |
20160063045 | Method and Apparatus for Road Risk Indices Generation - A system includes a processor configured to gather historical risk-affecting data with respect to a current road. The processor is also configured to gather current risk-affecting data with respect to the current road. Further, the processor is configured to generate a baseline risk index for the road based on the historical data. The processor is additionally configured to modify the baseline risk index based on the current data and provide a risk index value for the current road based on the modified baseline risk index | 03-03-2016 |
20160069771 | SYSTEM AND METHODS FOR FUEL SYSTEM LEAK DETECTION - A method for a fuel system comprises indicating a leak in the fuel system based on a pressure change rate distribution during a first condition including a sealed fuel system and a pressure change rate within a threshold of zero. By indicating a leak based on a pressure change rate distribution rather than through simple thresholding, an engine-off natural vacuum test may be performed in a greater range of conditions. In this way, the execution rate of the test may be increased while maintaining or improving the leak detection rate and reducing the misclassification rate. | 03-10-2016 |
20160102594 | INTEGRATED FUEL CATALYST MONITOR - A method is provided for monitoring an emission control device coupled to an engine. In one example approach, the method comprises, following a deceleration fuel shut-off (DFSO) duration, indicating degradation of an emission device based on an amount of rich products required to cause a sensor to become richer than a first threshold, the indicating carried out when DFSO duration is greater than a second threshold. The method also comprises an integration which is based on inlet air-fuel ratio, the integration starting only after a pre-catalyst sensor reaches stoichiometry. | 04-14-2016 |