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A Control Method for Fault Diagnosis and Reconfiguration of In-wheel Motor Current Sensor

A current sensor and sensor failure technology, which is applied in the direction of motor generator testing, current/voltage measurement, instrumentation, etc., can solve problems such as lack of robustness and relatively high requirements for system computing capabilities, and achieve improved fault tolerance and robustness and real-time effects

Active Publication Date: 2021-04-20
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

First of all, the control method obtains the normal current observation value by constructing the state equation, which requires an accurate motor drive system model and clear system parameters. It is well known that the motor parameters will change due to temperature changes during the actual operation of the motor, so , this control method does not have good robustness. At the same time, this control method needs to establish a model for the entire motor drive system, which requires relatively high computing power for the system.

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Embodiment Construction

[0055] The concrete implementation of the present invention is divided into the following 6 steps:

[0056] 1. Establish the expression of the sensor current when the hub motor fails. There are mainly three types of current sensor faults. Fault 1 is a complete failure fault, that is, the sudden failure of the sensor measurement causes the measurement signal to be lost; fault 2 is a fixed deviation fault, that is, there is a constant error between the measured value of the sensor and the real value; fault 3 is drift deviation A fault, i.e. the deviation of the sensor measurement from the true value changes over time.

[0057] When the x-phase current sensor fails, the phase current output value of the sensor will change, including changes in current amplitude and phase angle. At this time, the output expression of the current sensor is:

[0058] i x =(1+A)I m sin(ωt+φ x )+B (1-1)

[0059] Among them, A is the drift deviation coefficient, B is the fixed deviation, I m is t...

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Abstract

The invention discloses a control method for fault diagnosis and reconstruction of a wheel hub motor. On the basis of the analysis of three main fault types of the sensor, an expression of the output current of the sensor under the closed-loop control of the wheel hub motor speed is established, and a wheel hub motor is provided. A control method for drive current sensor fault diagnosis and current information reconstruction. The proposed method can be used to deal with the complete failure of the sensor, and at the same time, it can realize the online correction capability of the fixed deviation and drift error of the sensor. The controller model relies on current information and motor rotor position information for real-time detection and control, and is not sensitive to changes in motor drive system parameters, thus effectively improving the robustness and real-time performance of the controller.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, and particularly relates to a control method for fault diagnosis and reconstruction of in-wheel motor current sensors. Background technique [0002] Due to the serious energy consumption and environmental pollution problems caused by traditional internal combustion engine vehicles, countries are actively researching and developing new energy vehicles to deal with and solve the problems of fuel consumption and pollution, hoping to solve the energy and environmental crisis faced by the new technology innovation of the automobile industry. At the same time, countries continue to improve the policies and standards related to vehicle energy conservation and emission reduction, traditional power vehicles are gradually transitioning to new energy vehicles, and the motor drive technology of new energy vehicles is developing rapidly. [0003] In-wheel motor technology is a distributed drive method that ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R19/165
CPCG01R19/16528G01R31/343G01R31/346
Inventor 孙晓东曹俊豪陈龙杨泽斌周卫琪田翔
Owner JIANGSU UNIV