| 摘要 |
Two lambda sensors (6, 7) are located at equal distances downstream of the nitrogen oxides (NOx) trap (3) in the exhaust line (2). One lambda sensor has a rhodium-based catalytic layer. Their output signals are connected to a differential measurement system (8), to determine the quantity of NOx in the exhaust gas. When the measurement exceeds a predetermined limit, the controller (4) initiates the regeneration phase.
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