NOx-Sensor

NOx sensor is typically a high-temperature device built to detect nitrogen oxides in exhaust system environment of automobile. The sensors can be incorporated upstream and downstream of the catalyst, for example, to provide a feedback control loop to the Engine Control Unit (ECU) of the exhaust emission system. The ECU can than make adjustments to optimize NOx conversion performance. Potential applications of NOx sensors as NOx emissions reduction technology for meeting increasingly strict exhaust gas regulations.

It monitors NOx concentration downstream of NOx adsorber catalysts to control NOx adsorber catalyst regeneration; NOx concentration before and after selective catalytic reduction (SCR) to control and optimize urea injection and also works as NOx-OBD, a self-diagnostics by sensor and unit to identify wear in catalysts and other components. It can be applied to gasoline lean burn engines as part of a broader engine control or diagnostic system used to insure proper operation of the NOx emission control system.