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Fault diagnosis method, fault-tolerant control method and fault-tolerant control system of BLDC position sensor

A sensor fault, fault diagnosis technology, applied in the direction of a single motor speed/torque control, instruments, measuring devices, etc., can solve problems such as torque ripple and motor current drop

Inactive Publication Date: 2013-12-11
TONGJI UNIV +1
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Problems solved by technology

However, this method stops the running motor, and the motor current drops rapidly, causing huge torque ripple

Method used

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  • Fault diagnosis method, fault-tolerant control method and fault-tolerant control system of BLDC position sensor
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  • Fault diagnosis method, fault-tolerant control method and fault-tolerant control system of BLDC position sensor

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0068] The invention proposes a fault diagnosis method for a position sensor of a brushless DC motor for a vehicle, a fault-tolerant control method based on fault diagnosis of the position sensor and a fault-tolerant control system thereof. The control method performs fault-tolerant control on the operation of the motor according to the fault state of the position sensor, so as to avoid the adverse effect of the fault of the position sensor on the operation of the motor.

[0069] Generally, a brushless DC motor (BLDC) has three Hall sensors as position sensors and obtains rotor position information from them. According to the particularity of the control process, the brushless DC motor control process includes start control and normal speed control. When the rotor speed is higher than a certain speed threshold, the motor enters the normal spee...

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Abstract

The invention provides a fault diagnosis method, a fault-tolerant control method and a fault-tolerant control system of an automobile BLDC position sensor. The fault diagnosis method and the fault-tolerant control method are carried out according to a starting stage and a normal speed regulation stage of a motor. At the starting stage, the position of a rotor is judged according to signal jumping of the position sensor, then the fault state of the position sensor is judged, and accordingly the mode of starting the motor is selected. At the normal speed regulating state, the rotor position value is calculated according to the rotor position estimation technology and is compared with a position sensor signal to judge the fault state, and accordingly the rotor position and the motor revolving speed can be verified. A fault-tolerant control module comprises a rotor position observing unit, a position sensor fault diagnosis unit and a fault-tolerant control unit all of which are connected in pairs. According to the fault diagnosis method, the fault state of the position sensor can be accurately judged, the fault-tolerant control method is adopted under the fault state of the position sensor, the normal starting and the speed controlling of the motor can be maintained, and insecurity or other damages caused by accidental sensor fault can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of brushless DC motors (BLDC) for vehicles, and relates to a control method and a control system for brushless DC motors for vehicles. Background technique [0002] Compared with brushed DC motor systems, brushless DC motor systems have great advantages in terms of efficiency, durability, and safety. The difference in their structure is that the brushless DC motor needs to install a position sensor to obtain the rotor position, usually a Hall sensor. However, the Hall device is prone to failure under harsh conditions such as humidity and heat, and cannot correctly give the rotor position signal, so that the brushless DC motor cannot operate normally. In order to enhance the reliability of the system, it is necessary to implement a certain control scheme for the motor system so that the motor can operate normally even when the Hall element fails, which involves a fault-tolerant control strategy. [0003] A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00G01B7/00H02P6/08
Inventor 周苏王明强贾雯杰钟继隆章桐吴全王东君
Owner TONGJI UNIV
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