《Table 1 Direction, amplitude or sign of system states and control force under typical movement tend

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《Improved ON-OFF Semi-active Control Algorithm and Its Performance Simulation Analysis》

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w here，QRCpis the corresponding estimate criteria on riding comfort of passive suspension system，QSHpis the corresponding estimate criteria on handling stability of standard ON-OFF semiactive suspension system，ηis the adjustment coefficient of riding comfort，andξis the adjustment coefficient of handling stability.The smaller the QCis，the better performance the suspension system gets.If there is no tendentious requirement on the estimate criteria of suspension system，then the adjustment coefficients are often set asη=1，andξ=1.The comparison w ith the corresponding estimate criteria of passive suspension system is adopted to eliminate the incomparability of different dimensions of the estimate criteria.The e exponent is employed to construct the assessment function mainly consider:（1）to amplify the side effect of the deteriorated estimate criteria，and enhance the discriminability of the deterioration effect；w hen one of the estimate criteria getting deteriorated，the QCcould grow larger rapidly；（2）to w eaken the positive effect of the improved estimate criteria，and prevent it from becoming dominated by some of the estimate criteria；w hen one of the estimate criteria w as getting improved，the QCw as shrinking smaller slow ly.The assessment results of the comprehensive performance of suspension system under different states of the estimate criteria are listed in Table 2.