A method for controlling a filtering efficiency of a filter including a filtering area between an inflow area and an outflow area. Determining a present exhaust mass flow into the filter. Determining a pressure drop across the filter from the inflow area and the outflow area of the filter. Normalizing the measured pressure drop to provide a normalized pressure drop according to a predetermined normalization pressure level at a predetermined temperature for a model filter. Comparing the normalized pressure drop to a pressure drop model including a relation between the pressure drop across a filter and exhaust mass flow to the filter. Determining a pressure deviation between the normalized pressure drop and a pressure drop value calculated based on the pressure drop model and the present exhaust gas flow. Controlling the pressure drop across the filter for reducing the pressure deviation.

Exhaust particulates are collected by a GPF(gasoline particulate filter) device. EGR control is executed, and exhaust gas flowing through an exhaust passage upstream of the GPF device is introduced into an intake passage via an EGR passage. In the EGR control, an opening area of the EGR passage is controlled to reduce the opening area of the EGR passage according to an operating state of the engine as a particulate deposition amount in the GPF device is increased.

Systems are provided for a diesel oxidation catalyst. In one example, the diesel oxidation catalyst comprises a washcoat with different catalytically active portions for reacting with one or more of carbon containing compounds and NO.sub.x. The diesel oxidation catalyst is located upstream of a particulate filter in an exhaust passage.

An exhaust purification system of the internal combustion engine, is provided with: an exhaust purification catalyst having a catalytic function; a particulate filter arranged at a downstream side from the exhaust purification catalyst; an oxygen feed device feeding gas containing oxygen into exhaust gas flowing into the particulate filter; a detection device detecting a concentration of ammonia in exhaust gas flowing out from the particulate filter; and a control device. The control device controls the oxygen feed device so as to feed oxygen from the oxygen feed device to the particulate filter if a temperature of the exhaust purification catalyst is equal to or greater than an activation temperature and an air-fuel ratio of exhaust gas is a rich air-fuel ratio, and estimates the amount of deposition of particulate matter on the particulate filter based on the output of the detection device when feeding oxygen.

A method includes determining an amount of particulate mass in a particulate filter of an exhaust aftertreatment system. The method includes, when the amount of particulate mass in the particulate filter is greater than a threshold particulate mass value, receiving engine state information, providing electric power to the particulate filter, and obtaining an impedance value of the particulate filter in response to providing the electric power. The method includes, when the amount of particulate mass in the particulate filter is greater than a threshold particulate mass value, determining a temperature of the particulate filter based on the impedance value, and adjusting a magnitude of the electric power in response to at least one of (i) the temperature of the particulate filter satisfying one or more temperature metrics and (ii) the engine state information satisfying one or more engine state metrics.

An engine exhaust aftertreatment device, comprising a first exhaust treatment unit and/or a second exhaust treatment unit; the first exhaust treatment unit comprises a first bypass pipeline (1) and a first connection pipe (4) provided between a DPF (2) and an SCR (3), one end of the first bypass pipeline (1) being in communication with a turbine front exhaust pipe (9), and the other end of the first bypass pipeline being in communication with the first connection pipe (4); the second exhaust treatment unit comprises a second bypass pipeline (19) and a second connection pipeline (20) provided between a DOC (13) and the DPF (2), one end of the second bypass pipeline (19) being in communication with the turbine front exhaust pipe (9), and the other end of the second bypass pipeline being in communication with the second connection pipeline (20); when it is detected that an engine (11) satisfies a starting condition of the first exhaust treatment unit, the first exhaust treatment unit starts; and when it is detected that the engine (11) satisfies a starting condition of the second exhaust treatment unit, the second exhaust treatment unit starts. Said device and method greatly improve the exhaust treatment efficiency and reduce the risk of exhaust excessive emission.

A particulate detection apparatus for controlling a particulate sensor which detects the amount of particulates discharged from a filter for collecting particulates contained in exhaust gas. The particulate sensor includes a detection section configured to electrify particulates contained in exhaust gas so as to produce electrified particulates. The particulate detection apparatus includes a period judgment section, an output obtainment section and an anomaly judgment section. The period judgment section judges whether or not the present point in time is within a previously set anomaly determination period just after completing a filter regeneration process. The output obtainment section obtains a sensor output representing the result of detection by the particulate sensor in the case where the present point in time is judged to be within the anomaly determination period. The anomaly judgment section judges whether or not the particulate sensor is anomalous based on the sensitivity characteristic of the sensor output.

A method, system, and apparatus relating to operating an internal combustion engine include steps or features for determining a performance threshold of a particulate filter disposed in an exhaust gas flow of the engine having a set time interval between regeneration events of the particulate filter; determining a rate at which the particulate filter is reaching the performance threshold; and controlling an exhaust gas characteristic to control the rate so that the performance threshold is reached at or just before an end of the time interval. In an embodiment, there are steps or features for interpreting a filter condition of the particulate filter; determining a particulate matter load rate of the filter as a function of the condition; determining a limit of an exhaust gas characteristic based on the load rate; and controlling engine operation to control the exhaust gas characteristic to satisfy the limit.

There is provided an exhaust treatment device for a diesel engine capable of accurately estimating an amount of ash deposition. In the exhaust treatment device, an ash deposition estimation device estimates an amount of ash deposition on a DPF after ending of regenerating treatment for the DPF, based on data regarding differential pressure and exhaust flow rate stored in a memory device over a period immediately before the end of regeneration, the period ranging from the end point of regenerating treatment for the DPF to a point in time going back a predetermined duration. An electronic control device preferably makes an alarm device issue an alarm, upon arrival of an estimated value of ash deposition at a predetermined alarm request value.

A soot particle sensor includes a laser module including a laser and a detector configured for the detection of temperature radiation. The soot particle sensor provides that the laser is configured to generate laser light, and the soot particle sensor includes an optical element situated in the beam path of the laser of the laser module, which is configured to bundle laser light originating from the laser module in a spot, and the detector is situated in the soot particle sensor so that it detects the radiation originating from the spot.