SYSTEM AND METHOD FOR OFF-HIGHWAY VEHICLE ENGINE CRANKING
First Claim
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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; and
in 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.
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Abstract
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.
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Citations
25 Claims
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1. A method of operating an engine, the engine coupled to a traction alternator for vehicle travelling and an auxiliary alternator, comprising:
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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; and in 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. - View Dependent Claims (2, 3, 4)
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5. A method of operating an engine, the engine coupled to a traction alternator for vehicle travelling, comprising:
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in an off-highway vehicle running mode of operation, supplying current from the traction alternator to a traction motor 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. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating an engine in an off-highway vehicle, the engine coupled to a traction alternator and an auxiliary alternator, comprising:
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in a running mode of operation, supplying a traction motor with current from the traction alternator via a traction inverter, charging a first energy source via the auxiliary alternator, and charging a secondary energy source via the traction alternator; and in a starting mode of operation, directing output from the first energy source through a DC-to-DC converter and to the secondary energy source before directing output of the secondary energy source to the traction alternator to assist in cranking the engine, the secondary energy source outputting a higher voltage than the secondary energy source. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A system for an off-highway vehicle, comprising:
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an engine; an auxiliary alternator mechanically coupled to the engine; a traction alternator mechanically coupled to the engine; a battery electrically coupled to the engine; a secondary energy storage system electrically coupled to the engine, the secondary energy storage system outputting a higher voltage than the battery; a hydraulic system which includes a hydraulic accumulator; and a controller for operating the auxiliary alternator to charge the battery during a running mode of operation;
the controller operating the traction alternator to charge the secondary energy storage system during the running mode of operation;
the controller operating the hydraulic accumulator to charge the battery during a working mode of operation; and
the controller operating the battery and the secondary energy storage system to supply current to the traction alternator to start the engine during a starting mode of operation. - View Dependent Claims (24, 25)
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Specification