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Detection of offset errors in phase current measurement for motor control system

A current measurement, offset error technology, used in control systems, vector control systems, control generators, etc.

Pending Publication Date: 2021-12-31
STEERING SOLUTIONS IP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used in an EPS system, failure to generate torque in a direction opposite to the desired motor torque command results in more than manual effort from the driver

Method used

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  • Detection of offset errors in phase current measurement for motor control system
  • Detection of offset errors in phase current measurement for motor control system
  • Detection of offset errors in phase current measurement for motor control system

Examples

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Embodiment Construction

[0020] Referring now to the drawings, the invention will be described with reference to specific embodiments, without limitation of the invention. figure 1 A block diagram depicting a torque control module 100 of a multiphase permanent magnet synchronous motor (PMSM) utilizing phase current measurement in a current control feedback loop according to some embodiments of the present invention. As shown, the torque control module 100 includes a motor reference current generator 102 , a current regulator module 104 and a current measurement diagnostic module 106 . figure 1 A current measurement module 108 and a motor 110 are also depicted.

[0021] As used herein, the term "module" or "submodule" refers to an application-specific integrated circuit (ASIC), electronic circuit, processor (shared, dedicated or grouped) that executes one or more software or firmware programs and memory, combinational logic, and / or other suitable components that provide the described functionality. W...

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Abstract

A system for detecting offset error in a power steering system is provided. The system includes a programmable high pass filter module configured to filter a final voltage command and generate a filtered final voltage command. The filtered final voltage command includes the sinusoidal component, a gain and phase compensation module configured to perform a gain compensation and a phase compensation on the filtered final voltage command to generate a compensated final voltage command. An error detection module is configured to determine an offset of the compensated final voltage command in a stator reference frame.

Description

Background technique [0001] An Electric Power Steering (EPS) system requires an electric motor operated using a torque control method to provide steering assistance. Field Oriented Control (FOC) can be utilized when using a Permanent Magnet Synchronous Machine (PMSM). FOC converts AC-phase motor voltage and current signals in a stationary reference frame to a synchronously rotating reference frame, often referred to as a d / q-axis reference frame, where motor voltage and current become direct current (DC) quantities. FOC torque control is usually achieved by a closed-loop current control method that employs a current regulator to minimize the error between the commanded current and the measured current for perfect current tracking. Therefore, current control needs to measure the motor current, which can be achieved by measuring the phase current of the motor, and then the phase current of the motor is transformed in the synchronous frame through Park Transform to perform contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H02P21/14H02P21/22
CPCH02P21/14G01R19/0092H02P21/22G01R31/343H02P6/10H02P6/28G01R31/34H02P27/08
Inventor P.普拉莫德S.巴拉尔J.A.克莱瑙
Owner STEERING SOLUTIONS IP HLDG