自适应巡航控制新方法

为提高汽车高速行驶的交通安全 ,提出一种新的基于目标安全车距的自适应巡航控制(ACC)方法 .它仅通过调节辅助节气门开度和驱动轮制动力矩即可实现 .论述了测距传感器的选择 ,目标安全车距、目标减速度的确定和实现 ,给出了ACC逻辑框图 ,进行了仿真分析 .探讨了误报现象及其排除方案 .仿真结果表明 ,这种控制方法是简单可行的 ,易于和ABS/ASR形成ABS/ASR/ACC集成化系统     

Adaptive Noise Cancellation Method Used for Wheel Speed Signal of Integrate ABS/ASR System

The anti-lock braking system (ABS) and anti-slip regulation system(ASR) are the very i mportantparts of active safety systems used for modern vehi-cles . This two systems make up of commonintegratesystem ABS/ASR[1 ,2]. At present ,the main controlmethodin ABS/ASRis the logic threshold method.When getting the wheel speed signal ,ECUcomputesand applies control after comparing current signalwith the threshold[3 -5].Because of many reasons ,the wheel speed sig-nals sampled in ABS/ASRalw…     

Integrated Control System of Vehicle ABS/ASR/ACC Based onMC9S12DP256

The integrated control system of vehicle ABS/ASR/ACC has been developed using the MC9S12DP256 singlechip, which is the new Motorola 16-bit product in HSC12 family.The system including the main control module, the datacollection module and the drive and fault diagnosis module is demonstrated and its data collection function is presented indetail. The system designed by the modularization can supervise the data,drive the valves and pump. The program can bedebugged on line, which is steady and reliable validated by the large numbers of vehicle road tests.     

基于Internet/Intranet的IDNC系统研究

基于Internet/Intranet,采用B/S模式,扩展传统DNC之功能,对集成化DNC系统进行了研究,借助RS232串口通信和Windows的多线程技术,采用Moxa公司的串口设备联网服务器,构建出数控加工网络化IDNC系统。该IDNC系统通过内联外延可有效地利用企业局域网乃至广域网进行信息集成和各分系统间实现资源共享,可实现系统的信息集成、制造信息管理、设备状态在线浏览和远程监控等功能。     

Experiment Research on Fine Regulation of Wheel Cylinder Pressure Using PWM Technology

A test bench of ABS/ASR integrated hydraulic system is developed by using pulse-width modulation （PWM） technology. The effective duty ratio range of ABS outlet valve has been tested in PWM control. With 50 Hz carrier wave frequency, the tests are performed to determine the correspondence between duty ratio and the wheel cylinder pressure variation. The duty ratio range of ABS outlet valve in PWM control is determined and an experimental model of pressure reduction velocity （PRV） of wheel cylinder using PWM control is established. By comparison and test of the experimental model and realization of controlling the duty ratio of ABS outlet valves, the fine regulation of wheel cylinder PRV is realized in the working of ABS/ASR braking regulation, which is important and valuable to the improvement of the ABS/ASR controlling effect.     

PVC/ABS/弹性体合金性能研究

用机械共混法制备了PVC/ABS/弹性体三元共混合金,研究了配比对合金物理机械性能尤其是断裂伸长率的影响.结果表明:弹性体的加入能显著提高PVC/ABS合金的断裂伸长率.     

具有自检功能的汽车防抱死系统电子控制电路

新型电子控制电路在汽车ABS系统控制单元中的应用使汽车ABS系统不但能进行一般的防抱死制动控制,还能实现故障自诊断及故障代码的输出,保证了汽车ABS系统的安全使用.同时在设计时还预留了一定的输入/输出端口,为进一步扩展汽车ABS系统电子控制装置的功能提供了可能.     

基于Matlab／Simulink的汽车防抱制动控制逻辑

在Matlab/Simulink仿真环境下实现了带防抱制动系统(ABS)的车辆动力学模型的计算机仿真.针对防抱控制器的关键——防抱制动控制逻辑,建立了Stateflow有限状态机模型,并结合4通道汽车防抱制动系统实现了对Stateflow模型的设计和调试,达到了满意的控制效果.     

汽车驱动防滑控制系统的研究

阐述了汽车驱动防滑控制技术的理论基础,论述了ASR系统的控制途径和控制策略,并对国内外ASR技术研究的现状和研究水平进行了较为详细的阐述,在此基础上还介绍了一些目前在ASR领域的新技术、新理论以及在某些方面的最新进展.     

不同协效剂对APP膨胀阻燃ABS/PET合金的影响

研究了8种协效剂(双噁唑啉、热塑性酚醛树脂、二氧化锰、蒙脱土、硼酸锌、4A分子筛、氧化锌和凹凸棒)对APP膨胀阻燃ABS/PET合金的影响,并探讨了ABS/PET/APP体系的降解成炭行为.研究表明,APP主要促进了PET分解成炭从而与其成为一种新型膨胀阻燃体系.通过氧指数(LOI)和UL-94标准测试燃烧性能,除凹凸棒外,其它7种协效剂均提高了ABS/PET/APP体系的氧指数,并使其通过V-0级测试;热失重分析(TGA)表明,ABS/PET/APP/协效剂体系具有更高的成炭率;通过扫描电子显微镜(SEM)对炭层表面进行观察,除凹凸棒体系外,其它7种协效剂体系的炭层表面均具有更好的致密性.     

HPVC/第三组分/ABS三元共混合金组成与性能研究

通过共混的方法重点研究了HPVC／ABS／MBS、HPVC／ABS／NBR三元共混合金的组成以及对机械性能和热性能的影响．实验结果表明：在HPVC／ABS共混体系内加入第三组分MBS和NBR确实能改善HPVC／ABS的相容性，使三元共混体系的热变形温度和综合力学性能以及合金的柔软度都比HPVC／ABS理想。     

ABS/PBT共混合金体系的研制

以ABS、PBT为基体树脂，RC为增容剂，NBR为增韧改性剂，并加入其它助剂，制备了ABS／PBT共混合金。研究了PBT的含量、ABS的牌号、相容剂和NBR的含量对ABS／PBT共混合金力学性能的影响。结果表明：用35％的PBT去改性不同牌号的ABS，与不加相容剂的状况比较，相容剂对ABS／PBT共混合金增容后，拉伸强度和弯曲强度分别提高11．2％和12．2％，共混合金的相分散性好，形态结构稳定。弹性体与相容剂协同作用，显著提高材料的韧性。加入20份NBR时，共混合金的断裂伸长率提高412．1％，冲击强度提高72．5％。并且在一定程度上克服了增韧对材料拉伸强度等性能造成的损失，起到了优化材料性能的目的。     

超细碳酸钙对PVC／ABS二元体系增韧改性的探讨

实验采用了非弹性体增韧的概念，利用无机刚性粒子超细碳酸钙（ＣａＣＯ３）对ＰＶＣ／ＡＢＳ体系进行增韧改性。结果表明，ＣａＣＯ３用量为１５份时，共混物的韧性有较大幅度的提高。实验还考察了不同共混温度对体系增韧效果的影响。此外，运用Ｊ积分法对ＰＶＣ／ＡＢＳ／ＣａＣＯ３体系韧性进行了表征     

基于NCV1124的ABS轮速信号采集处理系统的设计与实现

介绍了ABS系统的工作原理,分析了可靠的轮速信号对于ABS系统的意义.为了解决传统的ABS轮速采集系统中存在的问题,选择安森美公司的NCV1124集成芯片,设计了适合于单片机信号采集的限幅、放大、滤波以及整形电路,改进了基于频率法的轮速采集处理算法,实现了全车速范围的准确测量.     

Effect of flame retardant containing phosphorus and silicone on thermal performance of PC/ABS

A flame retardant (DPA-SiN) containing phosphorus, nitrogen and silicon elements was synthesized. The halogen free flame retardant was incorporated into PC/ABS to improve its flame retardancy. The flame-retardant properties of the PC/ABS/DPA-SiN blends were estimated by limiting oxygen index (LOI) values and CONE Calorimeter, while thermal stabilities were investigated through thermo gravimetric analysis (TGA). The PC/ABS/DPA-SiN blends were thermally degraded at 400 °C for different amounts of time and studied by Fourier transform infrared spectroscopy (FTIR) to better understand the degradation behavior of PC/ABS/DPA-SiN. Funded by Shanghai Science and Technology Commission of China (No. 05dz22303)