Patent ID: 7261086
Filing Date: 2007-08-28
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method for the fast warm-up of an exhaust treatment device during cold start of a diesel engine having a plurality of combustion chambers, a means for restricting the flow of an intake air charge into the combustion chambers, a fuel injection system, and a variable geometry turbocharger, said method comprising: determining a desired activation temperature for said exhaust treatment device; closing said means for restricting the flow of an intake air charge to a position sufficient to provide a combustion chamber pressure of less than 55 kPa starting said engine; and operating said engine at fast idle in a low pressure premixed charge compression ignition combustion mode and increasing the idle speed to a value sufficient to provide an engine-out exhaust gas temperature higher than said determined desired activation temperature of said exhaust treatment device.