Methods and systems for detecting current sensor error
AssigneeGM Global Technology Operations LLC
InventorsSibaprasad Chakrabarti, Wei D. Wang
Life of this patent
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Abstract
Methods and systems are provided for controlling an electric motor in a vehicle. A method comprises measuring current associated with a first phase of the electric motor using a first current sensor resulting in a measured first phase current and measuring current associated with a second phase of the electric motor using a second current sensor resulting in a measured second phase current. The method further comprises determining a target value for the measured second phase current based on a value corresponding to a peak current for the first phase and identifying a current sensor error based on a difference between the measured second phase current and the target value.
Claims20
A method for controlling an electric motor in a vehicle, the method comprising:
- measuring current associated with a first phase of the electric motor using a first current sensor resulting in a measured first phase current;
- measuring current associated with a second phase of the electric motor using a second current sensor resulting in a measured second phase current;
- determining a target value for the measured second phase current based on a value corresponding to a peak current for the first phase;
- and
- identifying a current sensor error based on a difference between the measured second phase current and the target value.
A method for controlling an electric motor using an inverter, the inverter being configured to operate the electric motor in a current-regulated control mode based on measured feedback currents from a first current sensor and a second current sensor, the method comprising:
- identifying a first current value, the first current value being measured by the first current sensor and corresponding to a peak current flowing through a first phase of the electric motor;
- obtaining a second current value, the second current value being measured by the second current sensor and corresponding to current flowing through a second phase of the electric motor;
- determining a target current value for the second phase based on the first current value;
- and
- identifying a current sensor error based on a difference between the target current value and the second current value.
An electrical system for use in a vehicle, the electrical system comprising:
- an energy source;
- an electric motor having a plurality of phases;
- an inverter coupled between the energy source and the electric motor;
- a first current sensor coupled to a first phase of the plurality of phases of the electric motor, the first current sensor being configured to measure current associated with the first phase resulting in a measured first phase current;
- a second current sensor coupled to a second phase of the plurality of phases of the electric motor, the second current sensor being configured to measure current associated with the second phase resulting in a measured second phase current;
- a controller coupled to the first current sensor, the second current sensor, and the inverter, wherein the controller is configured to:
- obtain a torque command;
- operate the inverter in a current-regulated control mode based on the torque command, the measured first phase current, and the measured second phase current;
- identify a steady-state condition;
- determine a target current value for the second phase in response to identifying the steady-state condition, the target current value being based on a value corresponding to a peak current for the first phase;
- and
- identify a current sensor error based the target current value and the measured second phase current.
Dependencies are inferred from the claim text.