An eps-based motor drive axle control and diagnostic protection system

Abstract

The invention relates to the technical field of automobile power steering, and discloses an EPS-based motor drive axle control and diagnosis protection system. It includes a logic control unit, a drive axle management unit, a drive axle, an EPS motor, and a current sampling unit; the logic control unit includes a logic control module, a communication module 1, and an AD sampling module; the drive management unit includes a logic signal receiving module, a logic signal amplification module, communication module 2, current collection and processing module, motor phase collection and processing module, voltage collection and processing module and fault diagnosis module. The invention guarantees a certain driving ability when the voltage is low, so that the EPS can operate effectively, and the fluctuation of the power supply voltage is small; and the current sampling is carried out on the three-phase circuit of the motor, and the open circuit, short circuit and overcurrent of the motor phase are realized by diagnosing the current value Diagnosis of faults, etc., and can perform gate drive shutdown detection of each FET of the drive bridge, VDS monitoring of each FET of the drive bridge, and diagnosis of the short circuit of the drive bridge to the power supply.

Description

technical field [0001] The invention relates to the technical field of automobile power steering, and more specifically, relates to an EPS-based motor drive axle control and diagnosis protection system. Background technique [0002] The motor and its control unit in the EPS system, as the execution unit of the human-vehicle interface, are particularly important for its protection and prevention design. At present, the motors and their control units in the domestic and foreign markets incorporate fault mechanisms such as overcurrent to the motor, short circuit of the H bridge, and open circuit of the H bridge. [0003] The current current detection method is a single method such as motor phase current detection, bus low-end current detection and bus high-end current detection, which cannot detect open circuit, short circuit, and overcurrent of H-bridge FETs in time. Contents of the invention [0004] In order to overcome at least one defect described in the above-mentioned...

AI Technical Summary

Problems solved by technology

[0003] The current current detection method is a single method such as motor phase current detection, bus low-end current detection and bus high-end current detection, which cannot detect the open circuit, short circuit, and overcurrent of the H-bridge FET in time.

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