An air blowing device includes a housing, a partition plate, an air blower, dampers, and a controller. The housing has a first side surface and a second side surface. The first side surface has inlet A and outlet A. The second side surface has inlet B and outlet B. The partition plate divides the hollow space of the housing into an upstream section and a downstream section. The upstream and downstream sections communicate with each other. The air blower conveys air from the upstream section to the downstream section. The dampers open and close the openings of inlets A and B, and outlets A and B. The controller controls air blowing of the air blower and opening and closing of each damper. Inlets A and B are disposed in the upstream section. Outlets A and B are disposed in the downstream section.

Methods and systems are provided for monitoring a change in exhaust particulate filter (PF) soot load during an engine non-combusting condition. In one example, a method may include, responsive to a higher than threshold PF temperature immediately prior to an engine shutdown, estimating a rate of soot burn when the engine is no longer combusting, and estimating a soot load on the PF during and at an onset of immediately subsequent engine start based in part on the rate of soot burn.

In an example, an air filter system includes an air filter and a thermally conductive particulate sensor (TCPS). The TCPS includes a temperature sensor to measure a first temperature of the TCPS at a first time, measure a second temperature of the TCPS at a second time, and provide the measured first temperature and the measured second temperature to a controller. The controller to determine an actual rate of temperature change based on the measured first temperature and the measured second temperature, compare the actual rate of temperature change to a target rate of temperature change, and provide a notification when a difference between the actual rate of temperature change and the target rate of temperature change is greater than an accumulation threshold indicative of a threshold amount of particulate accumulation on the TCPS.

A method for controlling an internal combustion engine including at least one exhaust-gas aftertreatment component having an electric heating element, the electric heating element heating the exhaust-gas aftertreatment component and the exhaust gas flowing through the exhaust-gas aftertreatment component, the electric heating element briefly or permanently being acted upon by a heating current, a gas, in particular fresh air and/or exhaust gas, flowing downstream through the exhaust-gas path. In the method, a first temperature upstream from the at least one exhaust-gas aftertreatment component is ascertained, a second temperature downstream from the exhaust-gas aftertreatment component is ascertained, and the exhaust-gas mass flow of the internal combustion engine is ascertained as a function of a first temperature difference between the first and the second temperature and a heating power of the electric heating element, and the internal combustion engine is controlled as a function of the exhaust-gas mass flow.

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 method for determining a degree of loading on a filter medium of a filter device on a vehicle through which a fluid flows includes determining an operating characteristic of the filter device based on at least one operating quantity of the vehicle and comparing a predefined reference characteristic of the filter device with the operating characteristic. The degree of loading is derived from a result of the comparing step.

Systems and Apparatus for a personal ventilation system that provides a personalized column of clean air surrounding a user's space is presented. The personal ventilation system includes an air purifier with a fan and an annular gap downstream of the fan. The annular gap has an inner radius that is within 95% of the outer radius. The annular gap structure allows the air purifier to produce a column of air with an entrainment ratio lower than other commercially available fan. At a distance of 1.5 meters, the air purifier is configured to have an entrainment ratio of lower than 40%. The air purifier also has a removable filter located upstream of the fan. The ventilation system is capable of delivering highly-localized filtered air to a user or location.

A wafer transporting method includes following operations. A plurality of wafers are received in a semiconductor container attached to a mobile vehicle. An air processing system is coupled to a wall of the semiconductor container. The air processing system includes an inlet valve, an outlet valve, a pump between the inlet valve and the outlet valve, and a desiccant coupled to the pump. The semiconductor container is moved. The pump of the air processing system is turned on to extract air from inside the semiconductor container into the air processing system through the inlet valve. Humidity of the air is reduced when the air passes through the desiccant of the air processing system. The air is returned back to the semiconductor container through the outlet valve.

Aspects herein include monitoring devices for filtration systems. An embodiment of the monitoring device can include a first fluid conduit and a first pressure sensor, wherein the first pressure sensor is in fluid communication with the first fluid conduit. The monitoring device can also include a second fluid conduit and a second pressure sensor, wherein the second pressure sensor is in fluid communication with the second fluid conduit. The monitoring device can also include a control circuit in electronic communication with the first pressure sensor and the second pressure sensor. The monitoring device can also include a housing, wherein the first pressure sensor, the second pressure sensor and the control circuit are all disposed within the housing. Other embodiments are also included herein.

A method of operating a cleaning process on a filter in a vehicle air intake includes passing air through the filter from an upstream side to a downstream side, and providing an exhaust duct having an inlet end adjacent the upstream side of the filter and an outlet end adjacent a cooling fan or other air-extraction device of the vehicle arranged to draw air through the exhaust duct from the inlet end to the outlet end. In a periodic cleaning subroutine, the rotational speed of the fan is increased from a first speed to a second speed, while a pulse of pressurized fluid is applied to a downstream side of the filter. The exhaust duct carries away material dislodged from the upstream side of the filter by the applied pulse, and the rotational speed of the fan is reduced to its original level.