汽车制动器降温系统的设计
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汽车制动器降温系统的设计(选题审批表,任务书,开题报告,中期检查表,毕业论文18800字,cad电路图3张)
摘 要:为解决装备鼓式制动器的汽车制动性能热衰退而引起的制动失效,本文设计了制动系抗热衰退自控冷却装置。本设计是通过感应器接收制动踏板动作信号,进而使自动控制空调系统工作,制冷气体流经制动器散热器,吸收制动器的热量,从而对制动器起到制冷作用。
本文首先从制动性能热衰退机理出发,分析了制动器生热和散热过程的换热平衡问题,得出导致制动性能热衰退因素,对生热和散热进行了计算,对试验起到了指导作用。针对主要影响因素进行了试验设计,在试验的基础上,着重对电路系统的设计及电动机的选择,风冷片的设计和自动化控制的设计。为了提高驾驶的安全性,进行了自动控制设计。制冷气体由半导体制冷片产生,电流由蓄电池提供,鼓风设备由电动机充当。本课题还进行了系统设计,主要包括:冷却控制系统整体设计、硬件设计及选型、电路设计。
试验表明:该冷却装置可有效地对制动鼓进行及时、迅速地冷却,可防止因制动前车速高或车辆超载引起的制动性能热衰退,并且该冷却装置安装方便灵活、自动化程度高和成本小等优点。将该冷却装置推广运用,将会获得一定的经济、社会效益。
关键词:鼓式制动器;冷却系统;半导体;单片机;步进电机
The Design of Automobile Brake Cooling System
Abstract:To address equipment, drum brakes, brake thermal performance brake failure caused the recession, the paper design of the braking system controlled cooling heat recession.This design is received by the brake pedal movement sensor signal, thereby enabling automatic control air conditioning system work, placed in the brake cooling gas into the position of the radiator, the heat absorption of the brake, and thus play a brake cooling.
This article first recession mechanism of heat from the braking performance, analyzes the brake heat and cooling process, heat balance, heat fade braking performance result obtained factors, heat and cooling is calculated, the test has played a guiding role.The major influencing factors for experimental design, based on the test, focusing on circuit design and motor selection, air-cooled chip design and design automation.In order to improve driving safety, for the automatic control design.Refrigerant gases generated by the semiconductor chip cooling, the current provided by the battery, the electric motor acts as blast equipment.The project also carried out system design, including: the overall cooling control system design, hardware design and selection, circuit design.
Results show that: the cooling device can be effectively carried out in time for brake drums and quickly cooling to prevent high speed by braking or vehicle prior to braking performance thermal overload caused recession, and easy installation of the cooling device flexibility, high degree of automationand the cost is small.Promote the use of the cooling device, it will be some economic and social benefits.
Key words:Drum brake;Cooling system;Semiconductor; Single chip microcomputer; Stepping motor
研究的内容及技术要求
本课题用小型空调为系统提供冷却气体,冷却量的调节是通过半导体制冷片电流量及电动机转速来实现。空调系统工作是由制动踏板制动信号自动控制的。
(1) 系统总体方案的确定;
(2) 电路铺设;
(3) 电动机的选型;
(4) 自动控制设计
(5) 保养与维修检测
对汽车鼓式制动器智能冷却系统的要求有以下几个要求:
(1)工作稳定可靠,可适时适量冷却调节,使用寿命长:
(2)保证冷却系统冷却效果的同时,不影响制动毂材料的应力分布;
(3)系统的抗干扰能力强;
目 录
摘要 1
关键词 1
1前言 2
2 课题背景 3
2.1 鼓式制动器介绍 3
2.2 鼓式制动器热衰退概述 5
2.3 制动器冷却系统的现状 7
3 鼓式制动器强制风冷却系统设计概述 9
3.1 论文的提出及意义 9
3.2 研究的内容及技术要求 9
3.3 系统具体技术路线及实现的功能 10
3.4 空气冷却的优缺点 10
4 冷却系统的设计原理及整体方案 11
4.1 制动性能热衰退机理分析 11
4.2 冷却系统散热定量分析 12
4.3 制冷材料性质分析 14
4.4 风冷翅片性质分析 16
4.5 系统的整体设计方案 18
5 冷却系统设计参数及图纸 20
5.1 电动机的选定 20
5.2 半导体制冷片的选定 21
5.3 温度传感器,放大器选定 21
5.4 单片机选定 23
5.5 电路图 24
6 结论与展望 27
6.1 论文成果 27
6.2 论文存在的不足 28
6.3 论文展望 28
6.4 论文总结 29
参考文献 29
致谢 30