A particulate filter for use in an exhaust aftertreatment system includes a ceramic substrate and an ash layer deposited atop the ceramic substrate. The ash layer has a uniform ash density of at least 0.4 g/L of the ceramic substrate. A method of depositing ash layers in a particulate filter of an exhaust aftertreatment system includes providing a ceramic substrate, preconditioning the ceramic substrate, depositing at least one ash layer atop the ceramic substrate during the preconditioning, monitoring uptake of soot into the particulate filter by measuring an increase in pressure drop across the particulate filter.

A filter module for filtering a fluid flow includes: a plurality of filter elements arranged parallel to one another in a fluid channel. A sensor is mounted on each filter element of the plurality of filter elements, each sensor being determining a loading state of a corresponding filter element. Each of the plurality of filter elements is a filter cartridge including plated filter medium. Each sensor is a flow sensor.

A monitoring clip to be secured to the edge of a filter cartridge includes a channel connecting both sides of the filter through which air will flow in response to the filter becoming clogged. Air flow within the channel will eventually be strong enough to pivotally move a flow vane. Controlling circuitry is used to detect the angular movement of the flow vane. When the flow vane moves to a triggering position, it is determined that the filter is clogged and requires replacement. Controlling circuitry will sound and illuminate a local alarm, and send a signal by Bluetooth or WiFi, to a smartphone. Although a clip format is preferred, the measuring and controlling circuitry of the monitoring clip can be also built into new filters.

A filtering detection device mainly comprises a filter, a fan and a detector. The filter is disposed on a machine housing of an electronic device, the fan is disposed at a position corresponding to the filter inside the machine, and the detector is disposed between the fan and the filter. The present invention uses the detector to detect the air flow velocity or flow rate of outside air entering the machine through the filter when the outside air is pumped into the machine through the filter. The detector determines whether the filter is clogged or not by detecting if the air flow rate or flow rate detected by the detector is reduced, then an alarm device electrically connected with the detector can be used to notify a user to replace the filter.

An air cleaner for a vehicle includes a case having an air inlet pipe and an air outlet pipe. A cover is removably attached to the case for covering an open top portion of the case. With the cover attached to the case an interior of the air cleaner defines a flow passage directed through the air cleaner from the air inlet pipe to the air outlet pipe. A filter element is received in the interior and is arranged over the flow passage. The flow passage immediately downstream of the filter element includes an elbow-shaped section for redirecting airflow from the filter element toward the air outlet pipe. The elbow-shaped section is provided with at least one first guide rib shaped correspondingly to the elbow-shaped section. The flow passage upstream of the air outlet pipe defines a branching section formed as an acoustic resonator for reducing air intake noise.

A method and system of predicting a replacement time of a cartridge for an air processing unit (APU) of a vehicle, include: checking an internal pressure of an air tank by a controller when an engine of the vehicle is started; calculating and accumulating a passing flow amount through the cartridge of the APU using a pressure change due to filling the air tank with air; and determining that the replacement time of the cartridge has been reached when an accumulated total passing flow amount exceeds a predetermined value. Therefore, it is possible to predict the replacement time of the cartridge by calculating an air flow amount based on the pressure change of the air tank.

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.

The present document discloses a method of operating a separator (1) for separating particles from a particle-laden airflow, wherein the separator comprises a flow path (F), a separation unit (11, 12, 13), arranged in the flow path (F), an impeller (14), arranged in the flow path (F), and an electric motor (15), configured to drive the impeller (14) so as to generate the airflow in the flow path (F). The method comprises initiating a power supply to the electric motor (15), measuring a pressure in the flow path using a pressure sensor (16a, 16b, 16c, 16d), determining a direction of the airflow based on the pressure, and if the direction of the airflow does not correspond to a desired direction of the airflow, then changing a phase sequence of the power supply to the electric motor (15). The document further discloses a separator (1) and a system comprising a separator (1) and a floor grinding machine (2).

A tubular air cleaner for an internal combustion engine includes a tubular housing, a tubular filter element, and a planar adsorbent filter. The tubular housing includes a circumferential wall including an inlet, a top wall including an outlet, and a bottom wall opposed to the top wall. The tubular filter element is accommodated in the housing. The planar adsorbent filter is located at an inner side of the filter element to adsorb evaporated fuel of the internal combustion engine. The adsorbent filter extends in an axial direction of the filter element. The filter element includes an inner surface spaced apart from each of opposite planes of the adsorbent filter by a gap that allows air to reach the outlet without passing through the adsorbent filter.

A particulate matter detection circuit includes, a negative resistance circuit that couples to a first antenna inserted in a housing accommodating a first filter that filters an exhaust gas, couples to a second antenna inserted in the housing via a matching circuit that performs an impedance matching and a second filter that narrows the frequency band of a passing signal, and oscillates at a resonance frequency of the housing, and a detection circuit that outputs a voltage value corresponding to a signal strength of a radio wave received by a third antenna or the second antenna inserted in the housing. The resonance frequency of the housing varies depending on an amount of matter adhered to the first filter.