Patent application number | Description | Published |
20130125529 | METHOD FOR CONTROLLING REGENERATION WITHIN AN AFTER-TREATMENT COMPONENT OF A COMPRESSION-IGNITION ENGINE - A method for controlling regeneration within an after-treatment component of a compression-ignition engine comprises calculating an initial estimate of accumulated particulate matter based on a pressure-based soot accumulation model and a pressure drop index indicative of a decrease in pressure across the component. An adjusted estimate of accumulated particulate matter in the component is calculated based on the initial estimate and a soot prediction error inherent in the soot model. The adjusted estimate is compared to a predetermined threshold associated with the after-treatment component, and a remedial action is initiated when the adjusted estimate of accumulated particulate matter in the after-treatment component exceeds the predetermined threshold. The pressure-based soot accumulation model may be configured to predict soot accumulation in the absence of passive regeneration, and an adjusted kinetic burn model may be used to estimate a quantity of soot disposed through passive regeneration. | 05-23-2013 |
20130239550 | FLEXIBLE REGENERATION TIME OF DIESEL PARTICULATE FILTER BASED ON FUEL EFFICIENCY - A method of controlling an exhaust gas treatment system includes measuring a quantity of fuel used by the vehicle during a defined time period of a regeneration event, and estimating a quantity of particulate matter being burnt from a particulate filter during the defined time period to define a particulate matter burn rate. The quantity of fuel used is compared with the calculated particulate matter burn rate to define a regeneration fuel efficiency ratio. The regeneration fuel efficiency ratio is compared to a minimum regeneration fuel efficiency rate to determine if the regeneration event is an efficient use of fuel or is not an efficient use of fuel. The regeneration event is stopped prior to an estimated completion of the regeneration event when the comparison of the regeneration fuel efficiency ratio to the minimum regeneration fuel efficiency rate indicates that the regeneration event is not an efficient use of fuel. | 09-19-2013 |
20140123608 | ENGINE-OUT SOOT FLOW RATE PREDICTION - 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. | 05-08-2014 |
20140157982 | PARTICULATE FILTER REGENERATION MANAGEMENT - 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. | 06-12-2014 |
20140338434 | ADAPTIVE SOOT MASS ESTIMATION IN A VEHICLE EXHAUST AFTER-TREATMENT DEVICE - 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. | 11-20-2014 |
20150020507 | PARTICULATE FILTER PERFORMANCE MONITORING - 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. | 01-22-2015 |
20150209729 | METHOD OF ESTIMATING HYDROCARBON STORAGE IN A CATALYTIC DEVICE - 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. | 07-30-2015 |
20150211962 | METHOD OF ESTIMATING SOOT OUTPUT FROM AN ENGINE - A method of estimating a current soot output from an engine includes sensing a mass flow rate of a flow of exhaust gas from the engine, and defining a soot output base rate of the engine when the engine is operating at a reference state. A soot ratio for a current operating state of the engine is calculated. The mass flow rate, the soot output base rate, and the soot ratio are multiplied together to define an estimated value of the current soot output from the engine. The soot ratio is based on current engine operating parameters, including an air/fuel ratio of the engine, an exhaust gas recirculation ratio of the engine, a fuel injection pressure of the engine, and a fuel injection timing of the engine. | 07-30-2015 |
20150240695 | DETECTING OVER-TEMPERATURE IN EXHAUST SYSTEM - A method for determining an over-temperature condition in an exhaust gas treatment system is provided. The method compares a current soot load in a particulate filter with a threshold soot load. The method compares each of a plurality of temperatures sensed by a plurality of temperature sensors with a threshold temperature. Based on determining that the current soot load in a particulate filter of the exhaust gas treatment system exceeds a threshold soot load and that one of the plurality of temperatures exceeds the threshold temperature, the method determines that the exhaust gas treatment system is in an over-temperature condition. Based on determining that the current soot load in the particular filter does not exceed the threshold soot load and that two or more of the plurality of temperatures exceed the threshold temperature, the method determines that the exhaust gas treatment system is in an over-temperature condition. | 08-27-2015 |
20150267590 | SYSTEM TO MONITOR REGENERATION FREQUENCY OF PARTICULATE FILTER - 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. | 09-24-2015 |
Patent application number | Description | Published |
20120000184 | METHOD OF MONITORING SOOT MASS IN A PARTICULATE FILTER AND MONITORING SYSTEM FOR SAME - A method of monitoring soot mass in a particulate filter of an exhaust system includes predicting soot mass in the particulate filter based at least partially on a pressure differential between exhaust flowing into the filter and exhaust flowing out of the filter. The predicted soot mass is then revised based at least partially on measured operating parameters indicative of mass flow rate of nitrogen oxides in exhaust flow of the exhaust system and temperature of the particulate filter. | 01-05-2012 |
20120004863 | METHOD OF MONITORING SOOT MASS IN A PARTICULATE FILTER AND MONITORING SYSTEM FOR SAME WITH CORRECTION FOR ACTIVE REGENERATION INEFFICIENCY - A method of monitoring soot mass in a particulate filter of an exhaust system includes determining a pressure differential across the filter, obtaining a first soot mass estimate by fitting the determined pressure differential to a first stored database of measured or modeled pressure differentials and corresponding measured soot masses taken during filter regeneration using a substantially similar filter previously loaded following a complete filter regeneration, and obtaining a second soot mass estimate by fitting the determined pressure differential to a second stored database of measured or modeled pressure differentials and corresponding measured soot masses taken during filter regeneration using a substantially similar filter loaded following an incomplete filter regeneration. Actual soot mass is estimated by calculating a weighted sum of the first and second soot mass estimates with weighting based on operating parameters indicative of regeneration efficiency. A monitoring system for a particulate filter is also provided. | 01-05-2012 |
20120006008 | OPTIMIZATION OF ACTIVE REGENERATION TRIGGERS BASED ON AMBIENT AND VEHICLE OPERATING CONDITIONS - A method of controlling the regeneration of a particulate filter includes defining a regeneration trigger limit for at least one operating parameter of the vehicle, modifying the regeneration trigger limit based upon a sensed ambient operating condition and a sensed vehicle operating condition to define a modified regeneration trigger limit, and regenerating the particulate filter when the modified regeneration trigger limit for the operating parameter is reached. | 01-12-2012 |
20120174652 | SYSTEM AND METHOD FOR ESTIMATING A MASS OF PARTICULATE MATTER ACCUMULATED IN A PARTICULATE FILTER - A particulate estimation system is configured for estimating a mass of particulate matter accumulated in a particulate filter of an exhaust system. The system includes a memory device, an interface, and a controller. The memory device stores a plurality of modules. Each of the plurality of modules is configured to uniquely estimate an amount of the particulate matter accumulated within the particulate filter over a period of time. The interface receives a plurality of input signals. The plurality of input signals correspond to a plurality of modules that are stored in the memory device. The controller derives a hybrid model based on the input signals. The hybrid model is configured to provide an output that is an estimation of the amount of particulate matter accumulated within the particulate filter over the period of time as a function of the plurality of input signals. | 07-12-2012 |
20120198820 | SYSTEM AND METHOD FOR ESTIMATING AN AMOUNT OF PARTICULATE MATTER ACCUMULATED IN A PARTICULATE FILTER - An amount of particulate matter accumulated in a particulate filter of an exhaust system is estimated by preloading a memory location with a plurality of hybrid models. Each hybrid model estimates an amount of particulate matter accumulated in the particulate filter between a pair of operating points. An estimated amount of particulate matter accumulated in the particulate filter is stored in the memory location for each hybrid model. Each hybrid model is ranked based on estimation accuracy during operating conditions and the highest ranked hybrid model is selected. The estimated amount of particulate matter accumulated in the particulate filter corresponding to the highest ranked hybrid model is added to the soot estimation value stored in the memory location that corresponds to a ranked hybrid model to provide a soot estimation value of a cumulative estimated amount of particulate matter contained in the particulate filter for the ranked hybrid model. | 08-09-2012 |
20130086886 | ELECTRICALLY HEATED OXIDATION CATALYST PARTICULATE MATTER PROTECTION - A control method for a heating device of an oxidation catalyst is provided. The control method includes: estimating an accumulation of particulate matter on the heating device; and selectively controlling a switching device in electrical communication with the heating device based on the estimated accumulation. | 04-11-2013 |
Patent application number | Description | Published |
20150205977 | COMPARTMENT-BASED DATA SECURITY - An embodiment of a non-transitory computer-readable storage medium stores instructions which, when processed by a processor, cause the processor to implement a method of securing data. The method includes: creating a user-controlled compartment associated with an object security label, the user-controlled compartment configured to be administered by a first user, the first user being associated with a first security label; storing, by the first user, a data set as an object in a data storage system accessible by multiple users, and associating the object with the object security label; and associating the first user security label with the user-controlled compartment, the user-controlled compartment defining access to the object as set by the user. | 07-23-2015 |
20150339056 | CLIENT-SIDE DATA CACHING - An apparatus for processing data from a host storage device includes a client processing device configured to be connected by a communication channel to the host storage device. The client processing device includes: a processor configured to request a data set stored at the host storage device, the data set associated with a globally unique identifier; and a cache configured to store a copy of the data set and the globally unique identifier based on the processor receiving the data set from the host storage device, the cache being a persistent storage configured to retain the copy of the data set until the processor stores a new data set in the cache, the cache configured to retain the copy of the data set independent of an amount of time that the data set is stored in the cache. | 11-26-2015 |