In the passive system, fluctuations in pressure in the exhaust system are utilised. The secondary air can be supplied actively or passively. The operating temperature of the catalytic converter is quickly reached through the heat generated in the secondary reaction. For vehicles with a three-way catalytic converter and a lambda control, the secondary air system is switched off after approx. To ensure there is enough oxygen for the reaction during the cold start phase, when the mixture is very rich, air is added to the exhaust flow. If there is sufficient residual oxygen in the exhaust system and the temperature is high enough, the HC and CO react in a secondary reaction to form CO2 and H2O. This is the task of the secondary air system. 300☌ – 350☌, the emissions must be lowered during the cold start phase using different measures. However, because the catalytic converter only works effectively from temperatures of approx. On average, up to 80 percent of the emissions of a driving cycle are emitted during a cold start. This system further lowers the HC and CO values during the cold start phase when the catalytic converter is not yet active.Ī conversion rate of over 90 percent is achieved using a 3-way catalytic converter in stoichiometrically operated gasoline engines. Home / Passenger car parts / Universal Range.Home / Passenger car parts / Brake system.Home / Passenger car parts / Vehicle electrics.Home / Passenger car parts / Vehicle electronics.
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