A stand-alone air filter assembly has a unitary molded plastic preform shell, with the preform shell including an inlet section, an outlet section, and a hose connection section integral with a downstream end of the outlet section. A filter media pack including a fluted filter media member is fitted inside the inlet section of the preform shell through which unfiltered air enters the air filter assembly. The outlet section of the preform shell through which filtered air leaves the air filter assembly converges from a larger, first cross-sectional area of the inlet section to a smaller, second cross-sectional area at the downstream end of the outlet section, and the outlet section includes one or more sensor ports that are each configured to support a sensor for measuring a characteristic of the filtered air leaving the air filter assembly. The hose connection section includes an annular hose bead interface formed around an outer circumference thereof for sealing engagement with a hose fluidly coupling the air filter assembly to an air intake on an engine.

A system includes an electronic fuel injection system of an engine, the electronic fuel injection system including an electronic governor control unit for controlling various functions of the engine.

The present invention provides methods and systems for an ion generator mounting device for application of bipolar ionization to airflow within a conduit, the device includes a housing for mounting to the conduit having an internal panel within the enclosure, and an arm extending from the housing for extension into the conduit and containing at least one opening. At least one coupling for mounting an ion generator to the arm oriented with an axis extending between a pair of electrodes of the ion generator being generally perpendicular to a flow direction of the airflow within the conduit.

In some examples, a mass airflow sensor apparatus includes a housing having a tubular bore for passage of air, with an airflow sensor disposed at least partially within the tubular bore. The airflow sensor may be configured to measure a flow rate of air flowing past the airflow sensor. A focus component may be disposed upstream of the mass airflow sensor, the focus component including a cylindrical tubular focus member suspended within the bore. Further, a nozzle may be disposed upstream of the focus component. The nozzle may include a conical inner surface angled toward a center of the bore. In addition, a grid component may be disposed upstream of the focus component. The grid component may include a mesh grid including a plurality of openings for smoothing a flow of air flowing toward the airflow sensor.

A system includes an electronic fuel injection system of an engine, the electronic fuel injection system including an electronic governor control unit for controlling various functions of the engine.

A motorcycle is provided with an engine unit having a crankcase and a cylinder assembly protruding diagonally frontward and upward from the crankcase. An air cleaner box has a rearward-descending shape extending from the upper side to the rear side of the cylinder assembly as seen in a side view to form a vertically elongating box shape. The air cleaner box is disposed between left and right frames of a chassis, and both side surfaces of the air cleaner box are separated from the chassis. The air cleaner box has a frontward-narrowing and rearward-narrowing width as seen in a top view. As a result, it is possible to obtain a sufficient box capacity and facilitate a compact design. In addition, it is possible to smoothly flow an air stream in the lateral sides of the air cleaner box.

Air cleaner assemblies, components, features and methods of assembly and use are described. Example air cleaner assemblies are depicted and described in which a main filter cartridge sealing surface is recessed from an open end of a housing body. An access cover of the housing is configured with a portion extending inwardly to engage a main filter cartridge portion and bias it against the main filter cartridge sealing surface. In selected assemblies, the portion of the access cover extending inwardly toward the main filter cartridge, is a precleaner having flow separator tubes therein.

A handheld work apparatus has a combustion engine for driving a tool of the work apparatus and further has an air filter unit for filtering the intake air of the combustion engine. The work apparatus defines a vertical direction. The air filter unit includes an air filter and a filter housing enclosing the air filter. The air filter extends along a filter axis and has a filter element disposed peripherally around the filter axis, wherein the filter axis forms an angle of inclination () with the vertical direction. The filter element has an upper filter section in relation to the vertical direction. The filter housing has, remotely from the upper filter section, at least one air intake window and, in addition thereto, a further upper, permanently open cold air intake window in the region of the upper filter section.

A filter element sensor module having a housing, a sidewall of the housing including a recessed portion. The sensor module including a sensor assembly being provided within the housing about a sensor port interface being provided at one end of the housing. The sensor module also including processing circuitry being configured to receive signals from the sensor assembly and communication module, the communication module being configured to transmit one or more sensed parameters from the sensor assembly.

An air filtration system comprises a filter housing that defines a collection chamber and includes an air inlet, an air outlet and a cleaning assembly opening in fluid communication with the collection chamber. The system also comprises a filter support mounted to the filter housing with each one of the air inlet and the air outlet being located on a respective side of the filter support; and a filter cleaning assembly mounted to the filter housing and including an actuation system; and a diaphragm assembly at least partially covering the filter cleaning opening. The diaphragm assembly vibrates upon actuation of the actuation system so as to displace air in the collection chamber to remove particulate matter from a filter engaged with the filter support. The present disclosure also concerns a combustion engine comprising an air filtration system and a method for cleaning an air filtration system.