Patent ID: 7308788
Filing Date: 2007-12-18
Classification: F01N,F02B,F02M,Y02T

Abstract:
1. A diesel engine comprising: an exhaust system comprising one or more exhaust manifolds and one or more after-treatment devices including a diesel oxidation catalyst (DOC) and a turbocharger comprising one or more turbine stages operated by exhaust from the one or more exhaust manifolds, wherein the exhaust system is arranged such that a first portion of the exhaust from the one or more exhaust manifolds enters the DOC after having passed through the turbocharger and a second portion of the exhaust from the one or more exhaust manifolds enters the DOC without passing through the turbocharger, wherein the second portion of the exhaust is delivered to the DOC through a passage extending from the one or more exhaust manifolds and comprising a close-coupled diesel oxidation catalyst (CCDOC) and a control valve, wherein the control valve is located in the passage downstream of the CCDOC, upstream of the first portion of the exhaust, and downstream of the second portion of the exhaust for controlling flow through the passage.