文档介绍：提供全套毕业设计
摘要
随着汽车电子技术、自动控制技术的逐步成熟和汽车网络通信技术的广泛应用,汽车线控技术也逐步得到青睐和深入研究是汽车未来的发展趋势。汽车线控技术就是将驾驶员的操纵动作经过传感器变成电信号,通过电缆直接传输到执行机构的一种系统。
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汽车离合器操纵形式有液压和拉线式两种,轿车多用液压操纵式,由总泵、分泵、软管、踏板等组成。本设计通过研究汽车液压操纵式离合器的组成、结构与设计;分析离合器接合过程和计算离合器的操纵力变化规律建立离合器的力学模型,选择驱动装置,设计传动机构,布置形式和控制系统。
本文研究了以单片机为核心的液压操纵式离合器线控系统的开发思路和设计方法。其中选择了线控系统的硬件并设计了线控部分压力控制单元的软件系统。软件核心是单片机,用脉宽调制(PWM)方法控制占空比对高速开关阀进行控制,实现离合器工作缸位置精确控制,软件采用PID控制算法。所设计的液压操纵式离合器线控操纵系统可与原系统的功能进行切换工作。
关键词:液压操纵式离合器;线控技术;脉宽调制;高速开关阀;PID算法
ABSTRACT
Along with the gradual maturity of automobile electronics and automatic control technicals and the work correspondence technicals extensively applied, automobile control by-wire has also gradually received favor and it will set a trend in research of the automobile in the automobile control by-wire technique is the system that the driver's operate working converted electrical signals by sensors and then directly transmitting the executing mrvhsnidm.
The operate form of the automobile cluth contains hydraulic type and mechanicaltype and the passenger cars mostly use the hydraulic operate type .It includes master cylinder,slave cylinder, hose, footpedal etc. This design selects the drive device and designs gear, arrangement and control system through studying position of the automobile hydraulic cluth, structure and design; building the model of the cluth by analysing the starting process and calculating variation law of the operate force .
This is the core of Microcontrollers hydraulic cluth development train of thought and design method,and the choice of hardware and the design of control by-wire was controller core of the software is Microcontroller which high-speed on-off valves are used and controlled with pulse width modulation (PWM) in this system to control the position of the slave cylinder accurately, and the PID control algorithm designs the control can be switched between the hydraulic cluth control by-wire system and the original system.