Air Injection

To reduce pollutants contained in the exhaust gas during the warm-up phase and to achieve the emission limits of the roll test in the USA, USA vehicles have a secondary air injection system.

For this reason, an electric air pump has been attached to the body in the engine compartment. This pump is activated by the DME control unit and blows the additional air through air ducts to the discharge valve. A pneumatic switching valve which is closed when the secondary air system is closed thus pre venting the flow of additional air is installed between the air pump and the discharge valve.

Function:

Secondary Air Injection System:

If the engine is started in a temperature range between minus 10.5°C and plus 60°C, the secondary air injection system is activated for a period of time dependent on the start temperature. The secondary air injection system is deactivated under the following conditions:
Engine load > 4.5 ms/rev.
Air mass > 300 kg/h
Engine speed > 3,800 rpm