载重车中央充放气系统自动控制算法研究

Research on automatic control algorithm for central tire inflation system of heavy-duty vehicle

轮胎是载重车的关键承载部件,为保障车辆行驶安全,在行驶过程中须实时监测各轮胎压力,并由中央充放气系统调节胎压。现有的胎压差值计算时间方式的充放气控制算法,未考虑轮胎充放气过程中动压的影响,导致胎压实际值与设定值偏差较大。在分析轮胎压力特性的基础上,提出了一种具有充放检查与调度功能的模糊-补偿式控制算法,通过模糊快充与误差补偿实现胎压的精确调节。以某型6×4载重车为例,建立充放气管路的数学模型,基于AMESim-MATLAB联合仿真平台对该控制算法进行了仿真与验证;由CAN总线获取胎压并将其作为充放气控制系统的输入,经模拟故障注入测试与装车验证,结果表明应用该控制算法的控制器原型能够实现载重车的胎压自动控制,且故障响应时间优于国标要求。

As a key load-bearing part of heavy-duty vehicle,the tire pressure should be supervised in real time and be adjusted through central tire inflation system to ensure safety driving.The common control algorithm based on pressure difference with calculation time will cause the actual value of tire pressure deviates greatly from the set value without considering the influence of dynamic pressure during tire inflation and deflation process.Based on the analysis of tire pressure characteristics,a fuzzy-compensation control algorithm which integrates checking and scheduling of inflation&deflation function was proposed to implement accurate adjusting tire pressure through fuzzy fast inflation and error compensation.Taking a 6×4 heavy-duty vehicle as the application object,an AMESim-MATLAB co-simulation platform was set up to simulate and verify the control algorithm.The acquired tire pressure through CAN bus was taken as the input parameter for the central tire inflation system.Through simulation of fault injection test and loading verification,the test results have shown that the controller prototype based on the control algorithm can realize automatic control of the tire pressure of heavy-duty vehicle,and the fault response time is less than the national recommended standard requirements.