| 摘要 |
<p>A sensor arrangement for use in an exhaust system, comprises a sensor element 44 adapted to be reached by the exhaust gas, a controller (10, fig 1), and means for providing a shielding gas located adjacent to the sensor element. The means for providing the shielding gas is adapted to flow shielding gas over the sensing element when in a virtual mode and/or a calibration mode so that a reduced amount of exhaust gas can reach the sensor element. Preferably, the means for providing the shielding gas is a gas nozzle 46 adapted for blowing a gas over the sensing element when in the virtual mode or calibration mode so that a reduced amount of exhaust gas can reach the sensor. The shielding gas may reduce the effect of harmful gas on the sensor element.</p> |
