05-07-2012 дата публикации
Номер: US20120169050A1
Принадлежит:
Methods and systems are provided for operating an engine, the engine coupled to a traction alternator for vehicle travelling. In one example, the method includes, in an off-highway vehicle running mode of operation, supplying current from the traction alternator to a traction motor via a traction inverter to propel the vehicle, and, in a starting mode of operation, supplying stored energy from a first energy source and a secondary energy source to the traction alternator to start the engine. 1. A method of operating an engine , the engine coupled to a traction alternator for vehicle travelling and an auxiliary alternator , comprising:in an off-highway vehicle running mode of operation, charging a battery at a first voltage from the auxiliary alternator while supplying current from the traction alternator to a traction motor to propel the vehicle; andin a starting mode of operation, generating a second, higher voltage, from stored energy, to drive the traction alternator to at least assist in starting the engine.2. The method of claim 1 , wherein the stored energy is stored electrical energy at the first voltage stored in the battery claim 1 , and the second claim 1 , higher voltage is generated through a DC-to-DC converter.3. The method of claim 1 , wherein the stored energy is stored electrical energy at the second voltage stored in a secondary electrical energy storage device.4. The method of claim 1 , wherein in the running mode of operation claim 1 , current is supplied by a traction inverter to the traction motor to propel the vehicle claim 1 , and during the starting mode of operation claim 1 , current is supplied at the second voltage to the traction inverter to drive the traction alternator.5. A method of operating an engine claim 1 , the engine coupled to a traction alternator for vehicle travelling claim 1 , comprising:in an off-highway vehicle running mode of operation, supplying current from the traction alternator to a traction motor to propel the ...
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