Experimental investigations of the disk brake mechanism for a passenger car clearly show a non-linear and asymmetric form of hysteresis. A computational model of the brake mechanism with hysteretic elements, based on the Bouc-Wen method, was developed and verified with the obtained experimental results. Using the developed model, an analysis of the influence of hysteresis on the vehicle dynamics during straight-line braking with an ABS was provided. The simulation model is a quarter-model of a vehicle with different initial velocities and road conditions. In this article, PID control and on-off relay control with thresholds of slip and wheel acceleration are considered. The influence of the variation in the hysteresis parameters on the main vehicle brake characteristics such as the stopping (brake) distance, the time of braking and the average acceleration are shown. In addition, the results with other ways of hysteresis representation (non-consideration, signal delay and a linear form of hysteresis) are deduced. The relationships of hysteresis and the brake distance versus the proportional gain for PID control and versus the time of the pressure-holding phase for on-off control are shown. The main outcomes of the presented material are as follows. 1. Experimental analysis using a dynamometer test rig confirmed the non-linear and asymmetric form of brake hysteresis. 2. Hysteresis in a brake mechanism influences complex braking manoeuvres, such as braking on slippery roads with high initial velocities or with a sharp change in the friction coefficient, but hysteresis can be neglected during braking from high velocities on a dry road owing to less impact. 3. The analysis shows that the effect of hysteresis on the stopping distance for a new hydraulic disk brake mechanism does not exceed 5% in most critical cases; however, ignoring this fact can cause incorrect control, e.g. a false demand to increase the control frequency of actuation. 4. To simplify the initial procedures of the ABS and brake design, the influence of the brake hysteresis on the vehicle dynamics can be represented by emulating the hysteresis as signal delay, because it provides sufficient accuracy. 5. The effect of hysteresis on the vehicle dynamics can be controlled by the actuation frequency or the rate of brake pressure that improves the adaptive properties of ABS control.


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    Title :

    Vehicle dynamics with brake hysteresis


    Contributors:


    Publication date :

    2013


    Size :

    12 Seiten, 8 Bilder, 4 Tabellen, 26 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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