METHOD TO MANAGE A HIGH VOLTAGE SYSTEM IN A HYBRID POWERTRAIN SYSTEM
First Claim
1. A method for operating a powertrain comprising an electromechanical transmission operative to transmit torque between an input member and an electric machine and an output member to transmit tractive torque, the electric machine electrically connected to an inverter device electrically connected to an energy storage device, the method comprising:
- detecting a shutdown event;
commanding the transmission to neutral;
commanding the electric machine to cease operating in a torque generating mode; and
electrically disconnecting the energy storage device from the inverter device.
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Accused Products
Abstract
A powertrain includes an electromechanical transmission operative to transmit torque between an input member and an electric machine and an output member to transmit tractive torque. The electric machine is electrically connected to an inverter device which is electrically connected to an energy storage device. A method for operating the powertrain includes detecting a shutdown event, commanding the transmission to neutral, commanding the electric machine to cease operating in a torque generating mode, and electrically disconnecting the energy storage device from the inverter device.
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Citations
20 Claims
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1. A method for operating a powertrain comprising an electromechanical transmission operative to transmit torque between an input member and an electric machine and an output member to transmit tractive torque, the electric machine electrically connected to an inverter device electrically connected to an energy storage device, the method comprising:
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detecting a shutdown event; commanding the transmission to neutral; commanding the electric machine to cease operating in a torque generating mode; and electrically disconnecting the energy storage device from the inverter device. - 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 for operating a powertrain comprising an electromechanical transmission operatively connected to an engine and an electric machine to transmit tractive torque to an output shaft, the electric machine electrically connected to an inverter device electrically connected to an energy storage device, the method comprising:
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detecting a shutdown event comprising one of an operator-initiated shutdown event, a fault-initiated shutdown event and an externally-initiated shutdown event; implementing a first high voltage management strategy when the operator-initiated shutdown event is detected, implementing a second high voltage management strategy when the fault-initiated shutdown event is detected, and implementing a third high voltage management strategy when the externally-initiated shutdown event is detected. - View Dependent Claims (18, 19)
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20. A method for managing power in an electric circuit of a hybrid transmission, the electric circuit including a capacitive circuit electrically connected to an inverter circuit and selectively electrically connected to an energy storage device and to an active discharge circuit;
- said inverter circuit electrically connected to an electric machine, the transmission operative to transmit torque between an input member and the electric machine and an output member, the method comprising;
providing the capacitive circuit electrically connected to the inverter circuit and electrically disconnected from the active discharge circuit; detecting a shutdown event; electrically connecting the active discharge circuit to the capacitive circuit; measuring voltage across the capacitive circuit; and routing electrical current from the capacitive circuit through the inverter circuit to the electric machine when the voltage across the capacitive circuit exceed the threshold voltage after a predetermined time period subsequent to detecting the shutdown event.
- said inverter circuit electrically connected to an electric machine, the transmission operative to transmit torque between an input member and the electric machine and an output member, the method comprising;
Specification