The passenger car will take on a strong pitching movement in the process of emergent braking, which makes a great impact on the ride comfort. The paper aims at resolving the practical problems of vehicle pitching. First, the variation characteristics of swing arm instant center of the front and rear suspensions are analyzed, and the suspensions adapted in the passenger car are under the combined effect of braking force and vertical force. Secondly, the calculation model of pitching characteristics and braking deceleration is established. Thirdly, test data of suspension K and C characteristic are analyzed so as to get the vertical and longitudinal displacement variation characteristics of the wheel center. Based on the calculation model of pitching characteristics and the tests of brake pitching characteristic, two conclusions are obtained. One is putting forward two evaluation indexes of vehicle pitching characteristics, the relationships of pitch angle versus braking deceleration and changing rate of longitudinal deceleration versus braking deceleration are used to comprehensively evaluate the pitching characteristics of vehicle; the other is taking advantage of four process parameters to control the pitching characteristics of vehicle in braking process, and the four parameters are respectively. The anti-dive control of front and rear suspensions, the variation of vehicle wheelbase, the displacement of the centre of gravity in vertical direction. According to the aforementioned study results, the ideal brake pitching characteristics can be reached through rationally matching the longitudinal inclination balance characteristics of front and rear suspensions.


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    Title :

    A Study on Pitching Characteristics of the Passenger Car in Braking Process


    Contributors:
    Wang, Xuanfeng (author) / Shi, Guang (author) / Jin, Lingge (author) / Ying, Guozeng (author) / Yang, Hongwei (author)


    Publication date :

    2012


    Size :

    18 Seiten





    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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