A Follow-up Calibration Method for Electric Power Steering Current Characteristics of Automobile

Abstract

The invention discloses a follow-up calibration method for the automobile brush-electric-power-steering assist current characteristics. The automobile brush-electric-power-steering assist current characteristics can be matched with automobile related physical parameters, parameter setting of an electronic control unit (for short, ECU) in EPS is adjusted and completed, and the best assist characteristics are output through EPS to meet the requirements of an automobile for the steering performance. Meanwhile, the follow-up calibration method is also suitable for the ECU parameter calibration process in the laboratory state to complete the EPS assist characteristics close to actual-automobile applications, and the calibration workloads of an actual automobile are completed. According to the follow-up calibration method, the EPS assist characteristics are equivalent to the characteristics of assist currents I output by the ECU, a characteristic curve of the assist currents I is calibrated, the driving speed V and the steering hand power T of the automobile and all the parameters of the characteristic curve of the assist currents I are relationally designed, parameter setting of a small quantity of key characteristic points is applied so that whole course calibration of the other characteristic parameters can be adjusted in a follow-up mode, visualization is achieved, and the follow-up calibration method is accurate, easy and convenient to operate and short in period.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and relates to a brushed electric power steering system (EPS for short), in particular to a follow-up calibration method for EPS power assist current characteristics. Background technique [0002] Modern automobiles are equipped with electric power steering systems, which are very popular. This system allows the driver to easily control the steering, execute steering commands in a timely and accurate manner, and accurately feed back road information, so that the driver can grasp the driving status of the vehicle in time, so that Judgment and make appropriate steering operation instructions. For this reason, the calibration of EPS power-assisted characteristics can not only meet the above requirements, but also make the car achieve good steering performance. The EPS assist characteristic is equivalent to the assist current characteristic output by the electronic control unit (ECU for short), ...

AI Technical Summary

Problems solved by technology

[0003] The calibration of the ECU assist current characteristic curve is usually carried out on the actual vehicle and under the specified road surface, respectively calibrate the assist current characteristic curves corresponding to different vehicle speeds (usually 6 vehicle speeds) to evaluate the steering hand force and feel, etc. Determine the appropriate power-assist current characteristic curve family tree, so it is inevitable that one will lose sight of the other and it will be difficult to integrate, and the calibration period to meet the steering performance requirements will be longer

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