Flux-weakening control method and device

A technology of field weakening control and control algorithm, applied in the direction of single motor speed/torque control, etc., can solve the problems of target value fluctuation and difficult to achieve smooth transition, and achieve the effect of avoiding fluctuation and smooth transition

Inactive Publication Date: 2015-06-10
BEIJING JINGWEI HIRAIN TECH CO INC
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Problems solved by technology

[0005] The embodiment of the present application provides a field weakening control method and device, the purpose is to solve the existing field weakening control method, which may cause fluctuations in the target values ​​of the direct axis component (id) and the quadrature axis component (iq), which is difficult Issues with achieving smooth transitions

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  • Flux-weakening control method and device

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Embodiment Construction

[0046] The embodiment of the present application discloses a field-weakening control method and device, which are applied to perform field-weakening control on the motor when the motor in the EPS system is running in a field-weakening interval. The key to field-weakening control of the motor is to obtain the quadrature-axis component and the direct-axis component of the current input to the motor in the field-weakening interval. In the embodiment of the present application, the two are obtained through the phase advance angle value.

[0047] During the operation of the motor, the voltage equation (as shown in equation (1)) and the current equation (as shown in equation (2)) must be satisfied at the same time:

[0048]

[0049] i d 2 + i q 2 ≤ i lim - - - ...

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Abstract

The invention provides a flux-weakening control method and device. The method comprises the steps of calculating the difference between the first actual measuring value of a quadrature-axis component of the current currently inputted to the motor and the first target value of the quadrature-axis component of the current; determining a second phase advance angle value according to the difference; calculating the second target value of the quadrature-axis component of the current inputted to the motor and the second target value of the quadrature-axis component according to the second phase advance angle value. According to the method, the second target value of the quadrature-axis component of the current inputted to the motor in a flux-weakening area and the second target value of the quadrature-axis component is calculated during performing flux-weakening control for the motor, rather than using the table look-up scheme; therefore, different second phase advance angle value corresponds to different id value and iq value, rather than the same id value and iq value within one range, and as a result, the fluctuation of the id value and the iq value can be avoided, and the smooth transition is achieved.

Description

technical field [0001] The present application relates to the field of automobile control, in particular to a field weakening control method and device. Background technique [0002] The Electric Power Steering (EPS) system performs current closed-loop control on the motor according to real-time vehicle speed and steering wheel torque signals, and outputs power assist torque, thereby assisting the driver to turn the steering wheel. As the actuator of the EPS system, the control performance of the booster motor determines the performance of the EPS system to a large extent. In order to ensure that the motor can output a larger torque when it is running at high speed, a field-weakening control algorithm is usually used to control the booster motor. [0003] At present, the field-weakening control algorithm is implemented by looking up a table, that is, when the motor is running in the field-weakening interval, according to the current speed and target torque of the motor, que...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08
CPCH02P6/08
Inventor 吴瀛喆
Owner BEIJING JINGWEI HIRAIN TECH CO INC
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