Abstract:
A method for particulate filter performance monitoring in an exhaust gas treatment system is provided. The method includes monitoring a current received from a soot sensor in the exhaust gas treatment system and comparing the current to a soot sensor current threshold. Based on determining that the current is greater than or equal to the soot sensor current threshold, an accumulated engine out soot value is compared to an accumulated engine out soot threshold. A particulate filter fault is set based on determining that the accumulated engine out soot value is less than the accumulated engine out soot threshold. A monitoring system and an exhaust gas treatment system of an engine are also provided.
Abstract:
A method of estimating hydrocarbon storage in a catalytic device of an exhaust gas treatment system includes calculating an amount of hydrocarbons absorbed in the catalytic device per unit volume of exhaust gas over a period of time, calculating an amount of hydrocarbons desorbed in the catalytic device per unit volume of exhaust gas over the period of time, and calculating an amount of hydrocarbons oxidized in the catalytic device per unit volume of exhaust gas over the period of time. The amount of hydrocarbons oxidized in the catalytic device and the amount of hydrocarbons desorbed in the catalytic device are subtracted from the amount of hydrocarbons absorbed in the catalytic device to determine the amount of hydrocarbons stored in the catalytic device.
Abstract:
A method of estimating a total amount of soot in a diesel particulate filter includes monitoring a pressure differential across the diesel particulate filter; monitoring an engine speed and an engine load from an engine in fluid communication with the diesel particulate filter; determining a first soot mass estimate from the monitored pressure differential, the first soot mass estimate having an associated confidence indicator based on the monitored engine speed and engine load; determining a second soot mass estimate from the monitored engine speed and engine load; and outputting the first soot mass estimate if the confidence indicator is above a predetermined threshold, and outputting the second soot mass estimate if the confidence indicator is below the predetermined threshold.
Abstract:
A method of estimating a total amount of soot in a diesel particulate filter includes monitoring a pressure differential across the diesel particulate filter; monitoring an engine speed and an engine load from an engine in fluid communication with the diesel particulate filter; determining a first soot mass estimate from the monitored pressure differential, the first soot mass estimate having an associated confidence indicator based on the monitored engine speed and engine load; determining a second soot mass estimate from the monitored engine speed and engine load; and outputting the first soot mass estimate if the confidence indicator is above a predetermined threshold, and outputting the second soot mass estimate if the confidence indicator is below the predetermined threshold.
Abstract:
A method for implementing particulate filter regeneration management is provided. The method includes determining a presumptive deviation between a particulate model and actual particulate level conditions of the particulate filter. The presumptive deviation is determined from identification of an occurrence of extended parking, a passive regeneration, residual particulates, and a pressure signal. Each of the extended parking, passive regeneration, residual particulate, and pressure signal is specified by a respective particulate model deviation type. The method also includes selectively controlling current to at least one zone of a plurality of zones of an electric heater to initiate a regeneration event based on the presumptive deviation, and estimating the particulate level in the particulate filter once the regeneration event is complete.
Abstract:
A method for engine-out soot flow rate prediction of an exhaust gas treatment system is provided. A measured level of oxides of nitrogen in the exhaust gas treatment system is received. An engine fuel injection timing and air-fuel ratio of an engine producing the oxides of nitrogen are also received. An engine timing factor is determined based on the engine fuel injection timing. An engine air-fuel ratio factor is determined based on the engine air-fuel ratio. An engine-out soot flow rate prediction is generated based on the measured level of oxides of nitrogen, the engine timing factor, and the engine air-fuel ratio factor.
Abstract:
An automotive vehicle includes an internal combustion engine that outputs exhaust gas from a cylinder, and an active thermal management system. The active thermal management system flows coolant around the cylinder thereby varying an exhaust temperature of the exhaust gas. An electronic engine controller controls the internal combustion engine and the active thermal management system. The engine controller generates a control signal to selectively operate the active thermal management system in a normal mode, a thermal increase mode, and a thermal decrease mode. The normal mode flows the coolant at a first coolant temperature. The thermal increase mode flows the coolant at a second coolant temperature greater than the first coolant temperature thereby increasing the exhaust temperature of the exhaust gas. The thermal decrease mode flows the coolant at a third coolant temperature less than the first coolant temperature thereby decreasing the exhaust temperature of the exhaust gas.
Abstract:
An exhaust gas assembly includes an exhaust gas tube configured to receive an exhaust gas from the internal combustion engine, which includes at least one cylinder. An oxidation catalytic device may be operatively connected to the exhaust gas tube and includes a catalyst. A first temperature sensor is operatively connected to the oxidation catalytic device. A controller is operatively connected to the first temperature sensor. A hydrocarbon injector is operatively connected to the controller and configured to selectively inject an amount of hydrocarbon at a hydrocarbon injection rate. The controller includes a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of controlling the hydrocarbon injection rate. The controller may be programmed to limit the hydrocarbon injection rate based at least partially on a combination of space velocity, temperature of the catalyst in the oxidation catalytic device and temperature of a particulate filter.
Abstract:
An exhaust treatment system to treat exhaust gas includes a particulate filter configured to trap soot contained in the exhaust gas, and a pressure sensor that outputs a pressure signal indicative of a pressure differential of the particulate filter. A soot mass module is configured to determine a soot mass indicative of an amount of soot stored in the particulate filter based on the pressure differential. The soot mass is selectively determined according to a first soot model or a second soot model. An adaptation soot load module corrects the first soot model based on the second soot model such that the first soot model is adapted to the second soot model. A frequency regeneration module determines an actual rate at which the first soot model is corrected. The frequency regeneration module further determines the particulate filter is excessively regenerated based on the actual rate and a threshold.
Abstract:
An exhaust treatment system to treat exhaust gas includes a particulate filter configured to trap soot contained in the exhaust gas, and a pressure sensor that outputs a pressure signal indicative of a pressure differential of the particulate filter. A soot mass module is configured to determine a soot mass indicative of an amount of soot stored in the particulate filter based on the pressure differential. The soot mass is selectively determined according to a first soot model or a second soot model. An adaptation soot load module corrects the first soot model based on the second soot model such that the first soot model is adapted to the second soot model. A frequency regeneration module determines an actual rate at which the first soot model is corrected. The frequency regeneration module further determines the particulate filter is excessively regenerated based on the actual rate and a threshold.