A method of constructing an intelligent composite controller for an AC motor used in eps

A composite controller, AC motor technology, applied in motor generator control, electronic commutation motor control, control of electromechanical brakes, etc. It can achieve the effect of excellent control effect, beneficial to engineering realization, and increase of short-term maximum voltage

Active Publication Date: 2020-09-25
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Since the on-board power supply voltage is 12V, the output torque of the booster motor is very small, which cannot meet the high-torque power boost required by mid-to-high-end cars, which limits the application of the EPS system on mid-to-high-end cars
[0005] (2) The torque provided by the DC motor fluctuates greatly, and there is a hidden danger of commutator failure, which reduces the reliability and safety of the EPS system
The shortcomings of this control method are also obvious. There are three PI controllers in the entire control system, and at least six controller parameters need to be tuned, which will bring a lot of workload in practical applications; and due to the inherent defects of the double closed-loop control structure , the dynamic characteristics of the system will be limited

Method used

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  • A method of constructing an intelligent composite controller for an AC motor used in eps
  • A method of constructing an intelligent composite controller for an AC motor used in eps
  • A method of constructing an intelligent composite controller for an AC motor used in eps

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Embodiment Construction

[0039] The concrete implementation of the present invention is divided into following ten steps:

[0040] Step 1: If figure 1 As shown, the EPS motor system 1 is constructed. The 2r / 2s coordinate transformation module 11 , the SVPWM module 12 , the inverter module 13 , the AC motor 14 , the steering shaft transmission system 15 , and the 3s / 2r coordinate transformation module 16 constitute the EPS motor system 1 as a whole. The EPS motor system 1 takes voltage u d , u q As input, take rotation angle θ and current i d i q for output. The two inputs of the 2r / 2s coordinate transformation module 11 are the voltage u d , u q , voltage u d , u q After coordinate transformation, the control voltage u in the two-phase stationary coordinate system is obtained α and u β , the control voltage u α and u β Value is used as the input of SVPWM module 12, and its output is switching pulse signal 0 and 1 (0 represents closing, and 1 is opening), and this switching pulse signal is...

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Abstract

The invention discloses a construction method of an AC motor intelligent composite controller for EPS (Electric Power Steering System) in the technical field of intelligent vehicle control and electric drive control equipment. The construction method includes the following steps: an EPS motor system with the voltages ud and uq as input and the angle of rotation theta and the currents id and iq asoutput is constructed; an optimal controller gain matrix of a state feedback controller is obtained by a controller parameter optimization module; the control voltages output by a power compensation controller, the state feedback controller and a voltage decoupling controller are combined to constitute a first part of input of a voltage limiting controller, and the angle of rotation theta and thecurrent iq are taken as a second part of input of the voltage limiting controller; and the three sub controllers constitute a high-performance composite controller. The short-term maximum voltage supplied to the motor is improved on the premise of ensuring the safe operation of the motor, and the saturation of the controller is restrained. The global optimal parameters of the state feedback controller are obtained through an artificial bee colony algorithm. The workload of parameter adjustment is reduced while the effect of the controller is improved.

Description

technical field [0001] The invention belongs to the technical field of intelligent vehicle control and electric drive control equipment, and in particular relates to a construction method of an AC motor controller used in an electric power steering system (EPS, Electric Power Steering System). Background technique [0002] The steering system of an automobile is one of the systems that directly affect the driving safety and reliability of the automobile. Automobile power steering system has changed from the most primitive mechanical steering system to hydraulic steering system, electro-hydraulic steering system, and then to the electric power steering system (EPS) which is more environmentally friendly, energy-saving and has better maneuverability. . EPS saves energy to a large extent, which is very beneficial to energy conservation and environmental protection. Automotive EPS is a power steering system that provides auxiliary torque directly through the motor. Its princip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00
CPCH02P21/00
Inventor 孙晓东胡昌昌陈龙周卫琪杨泽斌李可
Owner JIANGSU UNIV
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