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Events 27 January 2021 By Vargas

Electronic wheel steering

Alessandro N. Vargas

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This page presents a project that will soon be built at UTFPR to increase electric power steering knowledge. It is a stand for automotive electric power steering that will support the parts.

Disturbances caused by irregularities on the road and variant mechanical friction can induce problems in controlling the torque of motors in electric power steering systems. Such stochastic disturbances are a challenge for the application of control techniques, where an experimental environment to extract parameters and compare strategies is necessary. In this work, a project for the construction of a study stand for automotive electric power steering (EPS) is presented.

The idea is to build a structure that will allow us to assemble one EPS system from a Ford Ka 2017 car. The structure will preserve all the mechanical features of the car. With this project, it will be possible to develop control techniques to improve the direction systems.

Having the system assembled, we will work in the electronic circuit responsible for controlling all the systems, reading the sensors' data, and turning on the electric engine when necessary. So, we will not use the original control center from the car. Instead, we will build with our technology. Associated with this technological problem, we should generate a mathematical model capable of describing all the system's behaviors.

Using mathematical models, we will study different control techniques and decide which one has the best results. In our setup, the "best" will be given by some index. In short, we will work on controlling the system, deciding which control law should be applied.

The electric system column has two sensors, one to measure the torque that is being applied to the steering wheel and another to measure the steering wheel's angle. These two data need to be acquired and processed correctly because the control technique's success relies on this data. To receive and process this data, we will use an AtMega328 microcontroller, which will be the brain of the system. Based on this data, the microcontroller will decide how much torque and direction the engine will use.

Right now, we are designing the structure in the software SolidWorks. As soon as we finish it, we are going to build and assemble the parts.