CPC F02D 41/1454 (2013.01) [F01N 13/008 (2013.01); F02D 41/1441 (2013.01); F02D 41/38 (2013.01); F01N 9/005 (2013.01); F01N 11/007 (2013.01); F01N 2560/02 (2013.01); F01N 2560/027 (2013.01); F01N 2560/14 (2013.01); F01N 2900/04 (2013.01); F01N 2900/0402 (2013.01); F01N 2900/0408 (2013.01); F01N 2900/0411 (2013.01); F01N 2900/0412 (2013.01); F01N 2900/0416 (2013.01); F01N 2900/06 (2013.01); F01N 2900/1402 (2013.01)] | 17 Claims |
1. A method, comprising:
determining presence of a zone flow in an aftertreatment system coupled to an engine in response to a difference between feedback from a first exhaust sensor and a second exhaust sensor, the first exhaust sensor is upstream of the second exhaust sensor, the first exhaust sensor is arranged in a gap in a catalyst housing between a first catalyst and a second catalyst.
|
7. An outer loop air-fuel control system, comprising:
a catalyst housing comprising a first catalyst and a second catalyst;
a first exhaust sensor positioned in a mid-bed region in between the first catalyst and the second catalyst;
a second exhaust sensor positioned downstream and outside of the catalyst housing;
a proportional controller configured to control an air-fuel ratio based on signals received from the first exhaust sensor;
an integral controller configured to control the air-fuel ratio based on signals received from the second exhaust sensor; and
a controller with computer-readable instructions stored thereon that when executed enable the controller to:
determine a presence of a zone flow based on a difference between feedback from the first exhaust sensor and the second exhaust sensor, the controller coupled to each of the proportional controller and the integral controller; and
signal to a fuel injector based on signals generated via only the proportional controller in response to the zone flow being absent.
|