汽车空调系统浅谈

随着人们对于汽车乘坐舒适性要求的不断提高,汽车空调得到长足发展,本文对汽车空调的定义、发展历程、工作特点做了说明,并按照动力源和结构形式的不同对其进行了分类,最后着重介绍了汽车空调系统组成及工作过程,介绍结构、工作情况时做到图文并茂,条理清晰,通俗易懂。     

Experimental study on performance of automotive air conditioning system using R-152a refrigerant

Recently, as climate changes have manifested worldwide, every country is making efforts to prevent ozone depletion and global warming. In the automotive industry, R-134a refrigerant is widely used in air conditioning systems because it has zero ozone depletion potential (ODP). Unfortunately, its global warming potential (GWP) is high. Therefore, alternative refrigerants are needed as a replacement for R-134a. R-152a is considered to be one of the better alternative refrigerants due to zero ODP and low GWP. In this paper, the performance of an automotive air conditioning system using R-134a and one using R-152a are compared experimentally at the bench level. The experimental apparatus simulated a real automotive air conditioning system consisting of a cabin and engine room structure. The cooling capacity, condensing capacity, coefficient of performance (COP) and power consumption characteristics of the automotive air conditioning system are evaluated by changing the air velocity entering the condenser and the compressor rotation speed with the optimized refrigerant charge amount. Also, the performance of the R-152a system was investigated by changing the thermostatic expansion valve which is set of values. The results of this study show that the R-152a system is slightly better than the R-134a system, not only under driving conditions but also under idling condition. R-152a refrigerant thus shows promise as an alternative refrigerant to replace the current standard, R-134a, in automotive air conditioning systems.     

浅析HFC-134a汽车空调管路扣压工艺

本文结合多个汽车空调管路生产厂家的实际加工经验,并进行了大量相关试验进行验证,对HFC-134a汽车空调扣压工艺进行了简单剖析,给出了合理的扣压部分参数建议,具有较高的实用参考性。     

汽车空调制冷系统的检修

夏季,汽车空调故障是一直以来困扰各位车主的难题,为了帮助车主及汽车爱好者快速找到相关故障,本文详细介绍了直观检查法及表组检查法,通过感官及压力表组的判断,即可确定故障原因。根据实际测量的高低压力值,结合视液镜、储液干燥器等其它部件的情况,得出汽车空调制冷系统的9大常见故障及维修方法。     

怎样正确使用和保养汽车空调

随着汽车工业的发展和人民生活水平的日益提高,汽车已走进了千家万户。人们不但追求汽车的安全性、可靠性、更注重它的舒适性,汽车空调也就成为现代汽车上的一项基本配置了。因此,车主们对汽车空调的正确使用,如何养等方面知识的需求越来越高多。根据车主们的需求,本文以通俗易懂的形式讲述了调的工作原理、正确使用和维护保养。     

重型卡车空调系统设计

本文以传统重型卡车用空调系统的设计思路为原型,根据现有重型卡车的性能要求及发展现状,经过合理匹配计算,设计了重型车用空调系统。     

城市客车空调系统的合理配置

针对城市公交客车的运营特点,通过分析总结影响其空调系统的动力特性和冷量输出特性的重要因素,合理配置城市公交客车的空调系统。     

汽车空调制冷系统的原理与故障排除

文章首先介绍了汽车空调制冷系统的组成,然后介绍了汽车空调制冷系统的工作原理,最后对汽车空调制冷系统常见故障及排除进行了详细的探讨。     

制冷剂加注量对车辆空调降温性能影响的研究

夏季空调降温性能的好坏是评价汽车舒适性的一项重要指标,空调制冷剂的填充量直接影响到空调系统的降温能力。本文通过改变汽车制冷剂的添加量的方式,对空调系统降温性能试验数据进行分析,来验证制冷剂对空调系统制冷性能的影响程度。     

R1234yf与R134a空调性能实验研究对比分析

为了实现制冷剂环境友好性,本文基于R1234yf与R134a不同的热物性参数基础上,在整车上进行R1234yf与R134a不同制冷剂系统的制冷性能及系统差异性的对比研究。分析R1234yf制冷剂的可替代性,进一步采取有效措施提高其制冷性能。     

汽车制动性能比较分析

汽车的制动性能关系剑汽车安全行驶性能。ABS防抱死系统的应用是汽车安全性方面最重要的技术进展。通过对装备ABS汽车与普通汽车制动距离的计算比较分析发现,在湿滑的道路上突然制动,ABS系统可以使驾驶员能够保持车辆行驶平稳,在较短的距离内将汽车刹住。但在不湿滑的路面上,缩短刹车距离的范同值比较小。而在冰雪路面上行驶的车辆,没有装备ABS的汽车在湿路面或冻路面上制动时,制动距离会过长且不能猛烈转向。而装备ABS系统的汽车也是如此,因为尽管ABS能提供附加的制动控制和转向控制,但它不能解决这样一个客观的物理事实：那就是在较滑的路面上,可利用的牵引力很小。     

机械式汽车悬架性能检测试验台闭环控制系统的开发

开发了机械式汽车悬架装置试验台闭环控制系统,设计了闭环控制算法,使试验过程中,保证加速度恒定,并通过实验验证了本系统的可行性和正确性,从而使新系统进一步满足汽车悬架特性测试的要求,又降低了研究成本。在软件的开发中,采用VC＋＋6.0语言编制控制系统,使得开发出的系统界面友好,操作方便,功能强大。     

基于ADVISOR的电动汽车传动系统参数设计与性能仿真

对电动汽车电动机、传动系的传动比和电池组容量等参数设计的原则和方法进行了研究,以某种型号电动汽车为研究对象,对其动力传动系的参数进行合理的选择和设计.建立了整车动力传动系统的仿真模型,应用电动汽车仿真软件ADVISOR对整车动力性进行了仿真计算.仿真结果表明,以铅酸电池为能源的电动汽车的加速性、爬坡能力、最大车速、续驶...     

客车空调技术的发展

1 汽车空调技术的发展汽车空调装置的出现始于20世纪20年代,当时其装置很简单,包括一个加热器,一个通风系统和一个空气过滤器,承担了在冬季向乘客供暖和为风窗玻璃除霜的任务。然而严格地说,它只能算是一个单一的取暖器。装有制冷机的轿车于1940年由美国的一个公司推出。二战期     

基于LabVIEW的空气流量传感器性能检测系统

本文简述了传统空气流量传感器检测系统的弊端,提出了一种基于LabVIEW软件的空气流量传感器测试系统的设计方案。本系统运用LabVIEW灵活性和多输入多输出的特点,能够很好地实现对测试数据实时绘图,方便操作。同时,给出了详细的硬件和软件设计方案。     

Analysis of an automotive ground system based on its steady-state model

As more electrical equipment is installed and larger currents are required in vehicles, the automotive ground system becomes more important to guarantee the stable operation of the equipment and efficient power consumption. In this paper, an automotive ground system is analyzed in a steady-state condition, and a simulation model for estimating its ground voltage distribution is described. The automotive ground system is divided into an engine compartment ground and a body ground, and it is modeled as an equivalent resistor network, which is suitable for simulation. By using the developed model, ground voltages are simulated and measurements are taken with a real car. A comparison of the simulation and measurement results shows good agreement, and the validity of the model is confirmed. Then, the factors that dominate the ground voltage level are discussed.     

基于汽车EPS助力转向性能分析及设计理念

对EPS电动助力转向系统的发展、组成、工作原理及关键部件的功能作了简要介绍。依据转向性能的要求,定性地阐述了电动助力转向、助力特性曲线议计方法。     

汽车网络总线技术发展分析

介绍了汽车网络总线技术的发展情况，着重对汽车网络技术的特征进行了分析并介绍了控制器局域网CAN总线的主要特点，认为CAN总线技术是汽车网络总线技术的首选。     

Performance of air conditioners with a gas-liquid separation condenser and one-tank laminated evaporator

In this study, a parallel flow condenser and laminated evaporator for an automotive air-conditioning system were modified to improve performance. Gas-liquid separation type condensers, in which the condenser and receiver drier are integrated, and one-tank laminated type evaporators were developed, and their performances were investigated experimentally using HFC-134a. Heat transfer characteristics in the condenser are examined by means of air temperature, air velocity entering the condenser and inlet pressure of the refrigerant; heat transfer characteristics in the evaporator are examined by means of air temperature, relative humidity, flow rate of air, outlet pressure of refrigerant and superheat. Pressure drops for both evaporator and condenser are also measured, and correlations for pressure drop are derived for the condenser and evaporator, respectively. Air velocity and mass flow rate of the refrigerant have a significant effect on the overall heat transfer coefficient, and flow pass is not significantly influenced by the cooling capacity of the condenser. The overall heat transfer coefficient of the evaporator increases as air flow rate, air temperature and relative humidity increases.