Current sensor calibration method of pure electric all-in-one controller assembly

Abstract

The invention discloses a current sensor calibration method for a pure electric all-in-one controller assembly, and the method comprises the steps: enabling a calibration platform to reconstruct a test connection mode of the controller assembly according to the demands through a switch unit, and achieving the mode switching and precise calibration mode: employing a high-precision constant current source as a standard, the method comprises the following steps: accurately and unidirectionally injecting a standard current with a known size into a phase loop of a controller assembly, enabling the standard current to flow through a corresponding current sensor, and then calculating a ratio of the standard current to a current sampled by a controller to obtain a calibration coefficient for calibrating the corresponding current sensor; a working condition verification mode: enabling the controller to drive the three-phase inductive load under the power supply of a high-voltage direct-current power supply, simulating the actual running state of the vehicle, and verifying the precision of the calibrated sensor in actual work in a closed loop manner by comparing the current measured by the current sensor in the controller assembly with the measured value of the current on the three-phase inductive load; and the consistency and reliability of controller assembly delivery are ensured.

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