Ford Global Technolgoies, LLC

Mark Robert Laleman

Michiel Jacques Van Nieuwstadt

Mark Douglas Malone

William Najib Mansur

In Kwang Yoo

Chad Everette Griffin

Marian Sue Chupa

John W Harris

James Joseph Reynolds

Methods and systems are provided for detecting NOx sensor degradation based on results from a NOx sensor self-diagnostic (SD) test performed after a key-off event. In one example, a method may comprise waiting a duration to perform a SD test of a NOx sensor after a key-off event until engine operating conditions stabilize and reach a set of qualifying conditions. One or more SD tests may be performed after waiting the duration, but outputs generated under conditions where one or more of a temperature at the sensor is greater than a threshold, and an oxygen concentration is outside a threshold range, may be excluded when determining whether or not the NOx sensor is degraded.

Systems and methods for performing a NOx self-diagnostic test

A vehicle and a method of controlling a dynamometer mode operation of a vehicle that includes requesting the dynamometer mode; monitoring for at least one non-dynamometer vehicle operating condition; if at least one of the non-dynamometer vehicle operating conditions is detected, prohibiting dynamometer mode; and if none of the non-dynamometer vehicle operating conditions is detected, operating the vehicle in dynamometer mode.

Dynamometer vehicle operating mode control

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Livonia, MI, United States of America

Mark Robert Laleman