Patent ID: 7343736

Claim:
An apparatus for the reduction of nitric oxides (NOx) and particulate matter of exhaust emissions from a compression ignition diesel engine having an electronic control module (ECM), comprising; a first treatment device for reducing particulate matter from said exhaust emissions; said first device comprised of a hollow housing having a front wall, a back wall, a top wall, a bottom wall and sidewalls extending substantially unbroken therebetween to define said hollow housing; said front wall equipped with an inlet and said back wall equipped with an outlet; a second treatment device for reducing NOx emissions from said exhaust, said second device comprised of a hollow housing, said housing having a front wall, a back wall, a top wall, a bottom wall and sidewalls extending substantially unbroken therebetween to define said hollow housing; said front wall equipped with an inlet and said back wall equipped with an outlet; said inlet from said first treatment device and said inlet from said second treatment device in fluid communication with each other and an engine exhaust stream from said engine through a first multi-position valve; said outlet from said first treatment device and said outlet from said second treatment device in fluid communication with each and a common exhaust outlet through a second multi-position valve; said first valve in fluid communication with said exhaust inlet from said engine and said second valve in fluid communication with said common exhaust outlet; each said first valve and said second valve in fluid communication with each other through a fluid connection extending therebetween; said first valve in a first position diverts the flow of exhaust gas to said inlet of said first treatment device; said exhaust gas exits said outlet of said first treatment device and is diverted by said second valve in a first position synchronous with said first valve position and diverts said exhaust gas flow to said inlet of second treatment device and through said second treatment device through said second treatment device outlet and said common exhaust outlet; said first and second multi position valves controllable and responsive to input from said engine ECM to control the flow of exhaust gas through said apparatus responsive to engine operating conditions.