Friction compensation logic of motor driven power steering and method thereof

Abstract

Exemplary embodiments of the present invention relate to a friction compensation logic of MDPS and a friction compensation method using the same. The friction compensation logic of MDPS in accordance with an embodiment of the present invention includes: a signal processor configured to extract only a signal having a limited range from column torque signals input from a column torque; a friction compensation sign calculator configured to determine a friction compensation sign by integrating the column torque signal extracted by the signal processor and calculating the friction compensation sign by limiting the integrated value to a set value; and a friction compensation torque calculator configured to calculate a friction compensation torque by reflecting a friction compensation amount to a value calculated by the friction compensation sign calculator.

Description

technical field [0001] The invention relates to MDPS friction compensation logic and a friction compensation method using it. In more detail, when driving the MDPS, the MDPS friction compensation logic and the friction compensation method using it are used to calculate the friction compensation torque based on the interval of friction fixation when the MDPS is driven. Background technique [0002] Generally speaking, the electric power steering (Motor Driven Power Steering, "hereinafter referred to as MDPS") system is based on the principle that the power handle is usually not driven by the drive of the power pump to circulate the oil, but is set separately at the lower end of the steering wheel shaft for A system that activates the steering engine that generates auxiliary steering force, activates the vehicle engine, operates the steering engine, and operates the power handle. [0003] In this way, for smooth operation of the MDPS system, such as figure 1 As shown, when c...

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Problems solved by technology

[0004] Generally speaking, the MDPS system is based on the friction (friction) that occurs when the steering components are driven separately. If the auxiliary steering force required to steer the engine is not generated, it is difficult to drive the power steering by the steering engine, so that the steering feel or initial improvement ( The build-up) feeling is not good, which will make the driver feel a different sense of steering

[0005] In addition, there is a problem of an artificial boost feeling due to excessive torque fluctuation due to excessive on-center steering column torque due to friction.

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