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为减轻驾驶员疲劳驾驶,降低汽车追尾风险,提高汽车主动避撞能力,提出了一种基于分层结构的汽车自适应巡航控制(ACC)系统总体设计方案。然后针对主动制动系统中的制动执行器,给出了一种新型设计方案,通过一套机电控制辅助制动装置加装在制动踏板上达到自动调节制动踏板行程的目的。为了实现期望加速度跟随控制,建立了用于求解期望制动踏板行程的车辆制动逆动力学模型并进行了计算机模拟仿真。结果表明:所设计的制动执行器在前车减速时能很好地响应ACC系统功能需求。
In order to reduce the driver’s fatigue driving, reduce the risk of rear-end collision and improve the ability of the vehicle to take the initiative to avoid collision, an overall design scheme of vehicle adaptive cruise control (ACC) system based on hierarchical structure is proposed. Then, aiming at the brake actuator in the active brake system, a new design scheme is proposed, which is installed on the brake pedal through a set of electromechanical control auxiliary brake device to achieve the purpose of automatically adjusting the brake pedal stroke. In order to realize the desired acceleration following control, an inverse kinematics model of vehicle braking system for solving the desired brake pedal travel was established and a computer simulation was carried out. The results show that the designed brake actuator can respond well to the functional requirements of ACC system in the front vehicle deceleration.