Variation characteristic of wheel cylinder pressure in electro-hydraulic braking system controlled by PWM signal
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摘要: 为了降低线控液压制动系统轮缸压力波动,采用稳态压力变化值表征轮缸压力变化率,研究了轮缸压力变化率在轮缸工作压力范围内的变化规律,推导了轮缸稳态压力变化值的计算公式,采用试验方法测得了系统稳态压力变化值随占空比与初始压力变化的脉谱图。计算结果表明:在升压过程中,轮缸压力变化率与初始压力的关系存在拐点,在拐点右侧,压力变化率随压力升高而降低,而在拐点左侧,压力变化率随压力升高而升高。不同占空比下轮缸压力变化率曲线的拐点对应的轮缸压力大体相同,此压力是活塞终止行程压力,在本系统中,此压力约为2.9 MPa。在压力变化的全部范围内,压力变化率与占空比之间的关系近似呈线性。Abstract: In order to decrease the variation amplitude of wheel cylinder pressure for electro-hydraulic braking system(EHB), the pressure variation rate was represented by the stable pressure variation value, and the variation law in the working range was investigated. The formula to calculate the stable pressure variation value was deduced, some experiments were carried out to measure the stable pressure variation values under different initial pressures and duty cycles. Calculation result shows that the curves of the rates have inflection points according to the initial pressures. At the left side of every inflection point, the pressure variation rate increases with the increase of initial pressure. While at the right side, the rate decreases. The inflection points at different duty cycles appear at the nearly same cylinder pressure. As the inflection point is caused by piston motivation, it is named as piston motivation's end pressure. In the system, it is about 2.9 MPa. The relationship between the pressure rate and the duty cycle is approximate linear in working pressure range.
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图 1 EHB结构
1-油箱; 2-单向阀; 3-液压泵; 4-电动机; 5-蓄能器; 6-溢流阀; 7-增压阀; 8-减压阀; 9-压力传感器; 10-制动轮缸
Figure 1. EHB structure
图 9 增压过程中稳态压力变化值与占空比关系
Figure 9. Relationship of stable pressure variation value and duty cycle in pressurzing process
图 10 减压过程中稳态压力变化值与占空比关系
Figure 10. Relationship of stable pressure variation value and duty cycle in decompressing process
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