Method and apparatus for controlling an engine start system
First Claim
1. An apparatus for controlling a synchronous machine used to start an engine during an engine start operation, said apparatus comprising:
- an exciter current control unit for controlling exciter current output to the synchronous machine during the engine start operation; and
a main current control unit for controlling main current output to the synchronous machine during the engine start operation as a function of machine speed, wherein said main current control unit controls main current output to the synchronous machine so that the synchronous machine exhibits a produced torque during an initial torque application stage that is lower than a produced torque exhibited during a subsequent torque application stage.
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Abstract
An apparatus (80) controls a synchronous machine (20) used to start an engine (300) during an engine start operation. The apparatus comprises: an exciter current control unit (84) for controlling exciter current output to the synchronous machine (20) during the engine start operation; and a main current control unit (82) for controlling main current output to the synchronous machine (20) during the engine start operation as a function of machine speed. In one implementation, the main current control unit (82) controls main current output to the synchronous machine (20) so that the synchronous machine (20) exhibits a reduced output torque during an initial torque application stage. The reduced viscous drag effects and reduced impact torque are beneficial to the engine system (100).
49 Citations
20 Claims
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1. An apparatus for controlling a synchronous machine used to start an engine during an engine start operation, said apparatus comprising:
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an exciter current control unit for controlling exciter current output to the synchronous machine during the engine start operation; and a main current control unit for controlling main current output to the synchronous machine during the engine start operation as a function of machine speed, wherein said main current control unit controls main current output to the synchronous machine so that the synchronous machine exhibits a produced torque during an initial torque application stage that is lower than a produced torque exhibited during a subsequent torque application stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for controlling a synchronous machine used to start an engine during an engine start operation, said apparatus comprising:
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a main current control unit for controlling main current output to the synchronous machine during the engine start operation; and an exciter current control unit for controlling exciter current output to the synchronous machine during the engine start operation as a function of machine speed, wherein said exciter current control unit controls exciter current output to the synchronous machine so that the synchronous machine exhibits a produced torque during an initial torque application stage that is lower than a produced torque exhibited during a subsequent torque application stage. - View Dependent Claims (11, 12, 13, 14)
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15. A method for controlling a synchronous machine used to start an engine during an engine start operation, said method comprising:
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controlling exciter current output to the synchronous machine during the engine start operation; and controlling main current output to the synchronous machine during the engine start operation, wherein said method controls at least one of main current and exciter current output to the synchronous machine during the engine start operation as a function of machine speed so that the synchronous machine exhibits produced torque during an initial torque application stage that is lower than a produced torque exhibited during a subsequent torque application stage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification