Abstract
The switch valve is the core component to achieve the rapid pressure change and accurate pressure control of electro-hydraulic brake system (EHBS). The normally closed switch valve (NCSV) is used as an outlet valve of the EHBS. The nonlinear flow controllability of the NCSV is one of the key technologies for the pressure control of the EHBS. The four working states of the NCSV are investigated by theoretical derivation and simulation analysis. The results show that the nonlinear flow of the NCSV is difficultly controlled due to the structural principle. Then, the pressure of the EHBS cannot be controlled accurately by the NCSV. In order to solve this problem, the structure of the traditional NCSV is modified to make the flow controllability better. The concept of “flow controllability factor” is proposed to evaluate nonlinear flow controllability of the two types of the NCSV comprehensively. The adaptive weight particle swarm optimization is used to further improve the nonlinear flow controllability of the new NCSV. After optimization, the flow controllability factor of the new NCSV is increased by 94.7%.
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