Exhaust gas collector for an exhaust aftertreatment system

An exhaust aftertreatment system, comprising:

• a duct having an inlet region, an outlet region, and a cross sectional area;
• an exhaust gas collector in the duct, including:
• a common collection location generally centrally located in the duct;
• a plurality of tubular sample members to collect exhaust gas samples and direct the samples to the common collection location, each sample member including:
• a first portion fluidly coupled to and extending radially from the common collection location;
• at least one second portion fluidly coupled to the first portion, the second portion extending from the first portion in a generally circumferential direction in the duct;
• and
• spaced apart exhaust collection holes in the first and second portions, wherein the sample members are positioned in the duct with the exhaust collection holes at locations distributed across the cross sectional area to collect exhaust samples from across the cross sectional area of the duct, and all exhaust gas samples collected at the common collection location are collected by the plurality of sample members;
• an accumulator tube fluidly coupled to the common collection location including:
• a first portion having a length that extends radially from the common collection location;
• and
• a second portion having a length and an open downstream end, wherein the second portion extends axially from the first portion and the open downstream end is located in an exhaust flow;
• and
• a sensor to sense the mixed exhaust gas in the second portion of the accumulator tube.

An exhaust aftertreatment system, comprising:

• a duct having an inlet region, an outlet region, and a cross sectional area;
• an exhaust gas collector in the duct, including:
• a common collection location generally centrally located in the duct;
• a plurality of tubular sample members extending from and fluidly coupled to the common collection location, to collect exhaust gas samples and direct the samples to the common collection location;
• and
• spaced apart exhaust collection holes in the sample members, wherein the sample members are positioned in the duct with the exhaust collection holes at locations distributed across the cross sectional area to collect exhaust samples from across the cross sectional area of the duct, and all exhaust gas samples collected at the common collection location are collected by the plurality of tubular sample members;
• an accumulator tube fluidly coupled to the common collection location, wherein the exhaust samples collected from all of the plurality of sample members are mixed in the accumulator tube and the common collection location;
• and
• a sensor to sense the mixed exhaust gas in the accumulator tube.