Patent ID: 7854114
Filing Date: 2010-12-21
Classification: F02D,Y02T

Abstract:
1. A method, comprising: providing an internal combustion engine including a plurality of pistons each and aftertreatment equipment, the plurality of pistons corresponding to a plurality of respective cylinders and a plurality of respective exhaust valves, operation of the engine at idle including: powering the engine with a first number of the pistons operating in a combustion mode; by loading the engine with a second number of the pistons operating in a brake mode, increasing temperature of exhaust produced by the first number of pistons to heat the aftertreatment equipment to a desired operational level, wherein the brake mode includes pumping air in and out of the respective cylinders through the respective exhaust valves corresponding to the second number of pistons; and adjusting fueling provided to the first number of pistons operating in the combustion mode to maintain a desired idle speed of the engine as the temperature of the exhaust increases.