Dynamic correction of the steering-characteristic curve and application to an EPS control system |
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Authors: | X Zhao X Shi J Chen X Li |
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Institution: | 1.School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai,China;2.Shanghai Aerospace Automobile Electromechanical Co., Ltd.,Shanghai,China |
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Abstract: | The steering torque of an electric-power steering (EPS) motor is interrelated with the performance of the EPS control system,
therefore calculating an exact steering torque is critical in this application. This study presents a dynamic correction method
that greatly decreases the calculated error in the steering torque; the PID controller demonstrated here is therefore suitable
for the demands of this system. Based on an analysis of the detection process of the steering torque sensor, we first deduced
that the variation of the system resistance torque equals the difference between the measured value of the steering torque
and the ideal one in the previous cycle. Based on this result, we then proposed a dynamic correction method. Finally, a comparison
of the simulated and experimental results for several vehicles evidenced the effectiveness of this dynamic correction method. |
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