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US 8,013,554 B2Granted
Shutdown path performance test for permanent magnet AC motor in hybrid powertrain
AssigneeGM Global Technology Operations LLC
InventorsStephen T. West, Wei D. Wang
Life of this patent
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Abstract
A diagnostic system for a hybrid vehicle comprises a motor control module and a fault diagnostic module. The motor control module controls torque output of an electric motor having a predetermined number of phases. The fault diagnostic module determines a position of a rotor of the electric motor, aligns the rotor with a phase angle of one of the phases, selectively diagnoses a fault based on a current of at least one of the phases, and selectively disables the electric motor based on the diagnosis.
Claims16
A diagnostic system for a hybrid vehicle, comprising:
- a motor control module that controls torque output of an electric motor having a predetermined number of phases;
- and
- a fault diagnostic module that determines a position of a rotor of said electric motor, that aligns said rotor with a phase angle of one of said phases, that selectively diagnoses a fault based on a normalized current of at least one of said phases, that determines said normalized current based on a first current of said one of said phases measured when said rotor is aligned with said phase angle and a second current of said one of said phases measured over a period after said rotor is aligned with said phase angle, and that selectively disables said electric motor based on said diagnosis.
A method for a hybrid vehicle, comprising:
- controlling torque output of an electric motor having a predetermined number of phases;
- determining a position of a rotor of said electric motor;
- aligning said rotor with a phase angle of one of said phases;
- selectively diagnosing a fault based on a normalized current of at least one of said phases;
- determining said normalized current based on a first current of said one of said phases measured when said rotor is aligned with said phase angle and a second current of said one of said phases measured over a period after said rotor is aligned with said phase angle;
- and
- selectively disabling said electric motor based on said diagnosis.
4 more elements
Dependencies are inferred from the claim text.