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AssigneeGeneral Motors Corporation
InventorsPaul Gottemoller, Monique M. Yeager
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A two cycle, preferably diesel, engine has a turbocharger with an exhaust driven turbine and supplemental mechanical drive maintaining a fixed minimum turbine/engine speed ratio with fuel efficient freewheeling (fully exhaust sustained) turbine operation at higher speeds and loads. A turbo boost system provides freewheeling turbine operation at intermediate speeds where it might or will not otherwise occur. When an intermediate speed is reached at which freewheeling can be sustained but is not occurring, the system 1) temporarily increases engine speed to a predetermined higher level to accelerate the turbine and increase engine air flow, 2) increases engine fuel input to a higher level capable of sustaining freewheeling, and 3) reduces engine speed to the selected intermediate speed while maintaining a fuel input level adequate to maintain turbine freewheeling. Methods and means for providing and controlling intermediate speed freewheeling operation are disclosed.
A method of operating a two cycle engine having a scavenging and charging turbocharger driven by exhaust gas energy supplemented by mechanical means which maintain a minimum ratio of turbocharger/engine speed when exhaust energy is below a level sufficient for exhaust sustained turbocharger operation, the method comprising the steps of
A method of operating a railway locomotive two cycle diesel engine having a scavenging and charging turbocharger driven by exhaust gas energy supplemented by mechanical means which maintain a minimum ratio of turbocharger/engine speed when exhaust energy is below a level sufficient for exhaust sustained turbocharger operation, the engine having control means providing a preset group of speed/load settings calling for low, intermediate and high speeds wherein at least one of the settings for intermediate speeds is inadequate to assure exhaust sustained turbocharger operation, the method comprising the steps of
Control means for operating a railway locomotive two cycle diesel engine having a scavenging and charging turbocharger driven by exhaust gas energy supplemented by mechanical means which maintain a minimum ratio of turbocharger/engine speed when exhaust energy is below a level sufficient for exhaust sustained turbocharger operation, the control means providing a preset group of speed/load settings calling for low, intermediate and high speeds wherein at least one of the settings for intermediate speeds is inadequate to assure exhaust sustained turbocharger operation, the control means further comprising
Dependencies are inferred from the claim text.