Patent ID: 7461627
Filing Date: 2008-12-09
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method of operating a compression ignition engine having multiple combustion chambers comprising: processing certain data to select one of plural fueling modes for operating the engine, and a) when the result of the processing selects a first fueling mode, i) fueling each combustion chamber during an engine cycle to cause alternative diesel combustion, ii) operating a first turbocharger to create charge air in a first intake manifold serving a first group of combustion chambers, iii) recirculating exhaust gas from the first group of combustion chambers through a first EGR valve to the first intake manifold, iv) operating a second turbocharger to create charge air in a second intake manifold serving a second group of combustion chambers, v) recirculating exhaust gas from the second group of combustion chambers through a second EGR valve to the second intake manifold; b) when the result of the processing selects a second fueling mode, i) fueling each combustion chamber during an engine cycle to cause conventional diesel combustion, ii) operating the first turbocharger to create charge air in the first intake manifold, iii) recirculating exhaust gas from the first group of combustion chambers through the first EGR valve to the first intake manifold, iv) operating the second turbocharger to create charge air in the second intake manifold, v) recirculating exhaust gas from the second group of combustion chambers through the second EGR valve to the second intake manifold, and c) when the result of the processing selects a third fueling mode, i) fueling each combustion chamber of the first group during an engine cycle to cause alternative diesel combustion, ii) fueling each combustion chamber of the second group during an engine cycle to cause conventional diesel combustion, iii) operating the first turbocharger to create charge air in the first intake manifold, iv) recirculating exhaust gas from the first group of combustion chambers through the first EGR valve to the first intake manifold, v) operating the second turbocharger to create charge air in the second intake manifold, and vi) recirculating exhaust gas from the second group of combustion chambers through the second EGR valve to the second intake manifold.