Secondary Air System – Electrical Secondary Air Pump and Secondary Air Valve

Technical description In 1990 vehicle emissions in Germany were reduced significantly by mandating all new cars to have a 3-way catalytic converter. Subsequently, as emissions regulations grew even stricter, the gap between what a 3-way catalytic converter could achieve and, what government regulations required, grew. It soon reached a level where additional exhaust gas after-treatments systems were needed, to meet regulations. In the early nineties, Pierburg GmbH was one of the first OEM suppliers to develop a secondary air pump. Since then Pierburg has evolved a secondary air system that includes...

Secondary air pump Pierburg secondary air pumps of two-stage radial flow design (Fig. 2) have been established in the market. A secondary air pump working on the principle of a side-channel blower (Fig. 3) is the latest member of the Pierburg pump family. The service-proven radial flow blower lends itself to manifold applications and can resort to a comprehensive portfolio of components available worldwide which allows for their adaptation to virtually all and any customer requests. The new side-channel blower excels by an extremely quick air flow build-up and its high delivery capacity at minimal...

the secondary air pump best in class in acoustics, i.e. the radial flow fan. Thanks to painstaking detail work, Pierburg GmbH achieved this goal. Acoustic measurements of seriesproduced systems make sure that the high quality standard of the secondary air pump (SAP) is reached. This level was optimized once again in 2003 by introducing sound power measuring technology. Thanks to the modular design and availability of DC motors of different power outputs, now both large-volume gasoline engines and vehicles of restricted installation space can be supplied with sufficient secondary air. This enables...

The vacuum controlled check valve (ARV) is a pneumatically operated on-off valve featuring low pressure loss. To activate this valve, vacuum from the intake manifold is supplied by a solenoid valve. The ARV operates on the check valve principle. This will reduce return flows when the valve is open With a view to reducing system costs, an alternative, selfopening valve was developed. This secondary air valve (SLV), shown in Fig. 5, will open as soon as the system pressure generated by the secondary air pump exceeds the valve opening pressure. The SLV enables system complexity to be distinctly...

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