Internal combustion engine including crankshaft that is rotated while engine is in a non-fueled mode and method of operating an engine
AssigneeMack Trucks, Inc.
InventorsJohn Jerwick, John Bartel
Life of this patent
Estimating the term…
Abstract
A method of operating an engine includes starting and stopping operation of an internal combustion engine that includes a crankshaft having a bearing journal and a bearing in which the bearing journal is rotatable. The crankshaft is constantly turned when the internal combustion engine is in the non-fueled mode. An oil pump can be driven to lubricate the bearing journal and the bearing while the internal combustion engine is in the non-fueled mode to provide hydrodynamic lubrication. An engine is also disclosed.
Claims15
A method of operating a hybrid powertrain, the hybrid powertrain comprising an internal combustion engine and an alternate drive, the alternate drive comprising a motor-generator, comprising:
- switching the internal combustion engine from a fueled mode to a non-fueled mode and back to a fueled mode, the internal combustion engine comprising a crankshaft having a bearing journal and a bearing in which the bearing journal is turnable;
- turning the crankshaft via the internal combustion engine only when the internal combustion engine operates in the fueled mode;
- operating the alternative drive when the internal combustion engine is in the non-fueled mode;
- and
- constantly turning the crankshaft via the alternate drive when the alternate drive is operated during an entire time that the internal combustion engine is in the non-fueled mode via a mechanical connection to the motor-generator of the hybrid powertrain.
A hybrid powertrain, comprising:
- an internal combustion engine comprising a crankshaft having a bearing journal and a bearing in which the bearing journal is turnable, the crankshaft being turned by the internal combustion engine when the internal combustion engine is operated in a fueled mode;
- an alternate drive arranged to operate when the internal combustion engine is in a non-fueled mode, the alternate drive comprising an electric motor-generator, the hybrid powertrain being operable to switch from a fueled mode during which the internal combustion engine operates and turns the crankshaft, to a non-fueled mode during which the internal combustion engine ceases operation during which the electric motor-generator operates, and back to the fueled mode;
- and
- means for constantly turning the crankshaft during an entire time that the internal combustion engine is in the non-fueled mode and not operated, the constant turning means comprising a mechanical connection to the electric motor-generator.
Dependencies are inferred from the claim text.