SYSTEM AND METHOD FOR LOCOMOTIVE ENGINE CRANKING
First Claim
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1. A method of operating a starting system coupled to a crankshaft of a vehicle engine, comprising:
- during engine starting, adjusting torque supplied by the starting system to the engine based on operating conditions to provide more than two torque levels.
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Abstract
In a method of operating a starting system coupled to a crankshaft of a vehicle engine, during engine starting, torque supplied by the starting system to the engine is continuously adjusted to provide more than two levels based on operating conditions of the vehicle or engine.
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Citations
20 Claims
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1. A method of operating a starting system coupled to a crankshaft of a vehicle engine, comprising:
during engine starting, adjusting torque supplied by the starting system to the engine based on operating conditions to provide more than two torque levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a three-phase alternator of a locomotive engine, the alternator having a field winding, comprising:
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during a first engine condition including engine starting, coupling a transistor in parallel to the field winding, and adjusting alternator torque supplied to the locomotive engine to provide more than two torque levels by repeatedly adjusting shunting of the field winding, the field winding adjusted via modulation of the transistor; and during a second engine condition after starting, coupling the transistor to a locomotive component other than the field winding, and controlling operation of the component by adjusting the transistor. - View Dependent Claims (18)
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19. A system for a locomotive, comprising:
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an engine; an AC traction motor including a traction inverter; a DC battery coupled to the traction inverter; an alternator including an armature, rotor, and a field winding; a switching circuit; a transistor; a locomotive component; and a controller for adjusting torque supplied to the engine during engine cranking, the controller operating the switching circuit to couple the transistor to the field winding in parallel and adjusting shunting of the field winding continuously during engine cranking responsive to operating conditions to adjust alternator torque supplied to the engine; and
the controller operating the switching circuit to couple to transistor to the locomotive component after engine starting during selected operating conditions to control operation of the locomotive component. - View Dependent Claims (20)
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Specification