NOx SENSOR DIAGNOSIS SYSTEM AND METHOD

摘要

Systems and methods for diagnosing a sensor for an exhaust system may include perturbing an output signal from the sensor for the exhaust system. The method may further include monitoring an output signal from a controller for controlling a component affecting the exhaust system or an unperturbed output signal from the sensor and diagnosing the sensor based on the monitored output signal from the controller or the unperturbed output signal from the sensor. In another implementation, a first controller may output the output signal from the sensor to a second controller configured to have a predetermined response to output signal. The first controller receives a response from the second controller and diagnoses the sensor based on the received response.

主权项

1. A method for diagnosing a sensor for an exhaust system comprising:
perturbing an output signal from the sensor for the exhaust system; monitoring a control signal from a controller for controlling a component affecting the exhaust system for a characteristic; and diagnosing the sensor based on the monitored characteristic of the control signal from the controller.