Provided are an apparatus for controlling a front wheel in a four wheel steering system and a method thereof. According to an embodiment of the present invention, the apparatus for controlling a front wheel in the four wheel steering system includes: a failure detection unit for detecting whether a rear wheel steering (RWS) device is inoperable to change a mode of an active front steering (AFS) device into a fail steering mode for the RWS device; a steering state determination unit for determining whether a state is a straight state or a rotational state based on a steering angle and a steering angular speed of a steering wheel; a straight mode execution unit for controlling a motor of the AFS device such that the front wheel repeats an in-phase and a reverse-phase with respect to a rear wheel so as to prevent a vehicle from deviating left and right; and a rotational mode execution unit for controlling the AFS device according to the steering angle such that the gear ratio of the AFS device during a turn in an in-phase direction can be greater than the gear ratio of the AFS device during a turn in a reverse-phase direction.

    사륜조향 시스템의 전륜 제어장치 및 그 방법이 제공된다. 본 발명의 실시예에 따른 사륜조향 시스템의 전륜 제어장치는 후륜조향장치(RWS)가 구동 불능인지의 여부를 감지하여 능동전륜조향장치(AFS)를 후륜조향장치(RWS)의 페일 조타모드로 변경하는 고장 감지부; 조향휠의 조향각 및 조향각속도를 기초로 직진상태인지 선회상태인지를 판단하는 조향상태 판단부; 후륜에 대하여 전륜이 동상 및 역상을 반복하여 차량이 좌우로 벗어나지 않도록 능동전륜조향장치(AFS)의 구동모터를 제어하는 직진모드 수행부; 및 조향각에 따라 능동전륜조향장치(AFS)를 제어하되 능동전륜조향장치(AFS)의 기어비가 동상방향턴인 경우 역상방향턴인 경우보다 크게 되도록 제어하는 선회모드 수행부;를 포함한다.


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    Title :

    Apparatus and method for controlling front steering in four wheel steering system


    Additional title:

    사륜조향 시스템의 전륜 제어장치 및 그 방법


    Contributors:

    Publication date :

    2018-05-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / B62D MOTOR VEHICLES , Motorfahrzeuge




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