After-treatment system

An after-treatment system, comprising:

• an after-treatment module configured to be installed in an exhaust system configured to carry exhaust gases produced by an engine such that at least a portion of the exhaust from the engine flows through the after-treatment module, the after-treatment module including:
• a housing having an exhaust inlet and an exhaust outlet, wherein the portion of the exhaust from the engine enters the housing through the exhaust inlet, passes through the housing, and exits the housing through the exhaust outlet, the housing enclosing components disposed along a flow path of the exhaust gas passing through the housing, the component comprising:
• a selective catalytic reduction (SCR) catalyst configured to facilitate a reduction reaction with NOx in the exhaust;
• a particulate trap configured to remove particulate matter from the exhaust produced by the engine;
• and
• at least one NOx sensor configured to take measurements of an amount of NOx in the exhaust passing through the housing;
• a thermal isolating structure connected directly to the housing, the thermal isolating structure including a mounting plate disposed at a distance from the housing such that an air gap is formed between the mounting plate and the housing;
• a controller connected to the mounting plate and configured to receive data from one or more of the components enclosed by the housing;
• a urea storage tank;
• and
• a urea dosing module configured to regulate the amount of urea delivered from the urea storage tank to the after-treatment module.

A method of installing an after-treatment system in an exhaust system of an exhaust producing engine, wherein the exhaust system includes an exhaust conduit, the method comprising:

• connecting an exhaust inlet of an after-treatment module and an exhaust outlet of the after-treatment module to the exhaust conduit;
• wherein the after-treatment module includes:
• a housing that forms the exhaust inlet and the exhaust outlet, the housing being configured to be installed in an exhaust system of an exhaust producing engine such that at least a portion of the exhaust from the engine enters the housing through the exhaust inlet, flows through the housing, and exits the housing through the exhaust outlet;
• at least one selective catalytic reduction (SCR) catalyst disposed along a flow path of the exhaust within the housing and configured to facilitate a reduction reaction with NOx in the exhaust;
• at least one NOx sensor disposed within the housing along the flow path of the exhaust and configured to take measurements of an amount of NOx in the exhaust;
• a thermal isolating structure connected directly to the housing, the thermal isolating structure including a mounting plate disposed at a distance from the housing such that an air gap is formed between the mounting plate and the housing;
• and
• a controller connected to the mounting plate and configured to receive the NOx measurements from the sensor;
• positioning a urea storage tank relative to the exhaust system;
• positioning, in proximity to the exhaust system, a urea dosing module configured to regulate the amount of urea delivered from the urea storage tank to the after-treatment module;
• and
• connecting interconnects between the after-treatment module, the urea storage tank, and the urea dosing module.