The catalytic converter can only work correctly if the air ratio is close to 1, which corresponds to a fuel/air ratio of 14.7/1. In order to put this into practice, the KE-lll-Jetronic injection system is equipped with a so-called lambda control. In this case, the lambda probe measures the amount of oxygen in the exhaust gases - a comparative value for the composition of the fuel / air mixture. If the indicator deviates from the ideal, the control unit instructs the pressure regulator in the corrector of the composition of the combustible mixture to immediately change the composition of the mixture. regulation works (arbitrarily oscillatory, because only in this case the catalytic converter copes with the almost complete conversion of harmful substances) in the range from l=0.8 to l=1.2. The lambda probe only transmits a signal after temperatures exceeding 350°C, so it is electrically heated (in addition to flue gas temperature). Until it reaches its operating temperature, the system remains unregulated and focuses on a given average factor. In the same way, regulation occurs if enrichment of the combustible mixture is activated under full load conditions.
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