Government regulators work hard to force auto and truck manufacturers to reduce the levels of exhaust gases such as Hydrocarbons (HC) and Carbon Monoxide (CO). These “Greenhouse” gases are blamed for many of the Earths ills including Global Warming.
No internal combustion engine is 100% efficient, so there are still unburned gasses present in the exhaust. This adds to pollution. One of the ways manufacturers reduce these gasses from reaching the tail pipe is to use an air pump. They use the air pump to inject air (oxygen) into the exhaust stream to help with the burning of these unburned hot exhaust gases. Since this work is done after the combustion chamber, there is no engine power gained from the blower, just a cleaner exhaust. In some systems, the pump also supplies air to the Catalytic converter to reduce the amounts of Hydrocarbons, carbon monoxide and Oxides of Nitrogen (NOx), the main components of Smog.
Typically, the air pump is driven by a poly V belt connected to the crankshaft. There are times during the driving cycle (like deceleration) when the pump may not be needed. To help with fuel economy, Ogura’s air pump has an electromagnetic clutch which can be controlled by the vehicles computer to disengage the pump from the system.