机械式自动变速器重型军用轮式车辆坡道起步控制策略研究

针对机械式自动变速器(AMT)重型军用轮式车辆坡道起步的问题,提出了车辆坡道起步控制策略。通过对试验车辆坡道起步过程进行动力学分析,结合发动机转速特性曲线,提出了基于油门开度、发动机转速和发动机转速下降率来估算离合器传递转矩的思想,并确定了驻车制动释放的条件。在试验车辆AMT系统硬件条件的基础上,设计了离合器的控制策略并编写了控制软件。分别在不同坡道上进行了多次试验,均取得了理想的效果。试验结果表明:研究过程中所提出的理论和方法正确,可实施性强,能够很好地满足AMT重型军用轮式车辆在不同坡道上的起步要求。

Research on Hill-start Control Strategy for Military Heavy-duty Wheeled Vehicles with AMT

A strategy of hill-start control is presented for military heavy-duty wheeled vehicles with automated mechanical transmission(AMT). A concept of that the opening degree of accelerator pedal, the engine speed and the decline rate of engine speed are used to estimate the clutch transmitting torque is put forward based on the dynamics analysis of hill-start process of vehicle and the engine speed characteristic curve. And also the parking brake release conditions are identified. The clutch control strategy is designed based on the existing experimental vehicle platform, and the satisfactory results are achieved when vehicle tests are carried out at the different angles of slopes. The experimental results show that the proposed theory is feasible.