System and method for controlling electric drive systems
AssigneeGM Global Technology Operations LLC
InventorsBon-Ho Bae, Steven E. Schulz, Nitinkumar R. Patel
Life of this patent
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Abstract
Methods, apparatus, and systems are provided for regulating the operation of a drive system within a battery voltage and power range. The apparatus includes a PI regulator producing a signal for regulating a torque output of the drive system based on a DC voltage source limit and/or power limit, a converter normalizing the signal from the PI regulator to produce a new torque limit, and a switch selecting either the new torque limit or an available torque limit of the drive system. The PI regulator includes an integrator having an initial value based on the torque output of the drive system and a copper loss term.
Claims20
A controller for regulating a torque output produced by an electric drive system, the electric drive system having a first torque limit, a voltage limit, and a power limit, the controller comprising:
- a proportional integral (PI) regulator configured to produce a signal for regulating the torque output based on at least one of the voltage limit and the power limit, said PI regulator comprising an integrator having an initial value based on the torque output and a loss term;
- a converter having an input coupled to said PI regulator and having an output, said converter configured to normalize said signal from said PI regulator to produce a second torque limit at said output;
- and
- a switch coupled to said PI current regulator and configured to select a torque limit from said first and second torque limits.
A method for regulating a torque output of a drive system, the drive system having a link voltage and at least partially powered by a DC voltage source having a voltage range, a source power, and a power range, the method comprising the steps of:
- generating the torque output in response to a torque command;
- determining if the link voltage exceeds the voltage range;
- selecting a first torque limit when the link voltage exceeds the voltage range, the first torque limit based on the torque output and a first loss term;
- determining if the source power exceeds a power range;
- and
- selecting a second torque limit when the source power exceeds the power range, the second torque limit based on the torque output and a second loss term.
A control system for regulating a torque output produced by a drive system, the drive system having a link voltage and at least partially powered by a direct current (DC) voltage source having a voltage range, a source power, and a power range, the control system comprising:
- a first controller configured to produce a torque command;
- a second controller coupled to said first controller and configured to:
- monitor the link voltage and the source power;
- regulate the torque command to maintain the link voltage within the voltage range based on the torque output and a first loss term;
- and
- regulate the torque command to maintain the source power within the power range based on the torque output and a second loss term.
Dependencies are inferred from the claim text.