基于阈值分析的防误踩加速踏板系统设计

汽车在行驶过程中,驾驶员在突发情况进行紧急制动时有时会出现误踩把加速踏板的行为,使得车辆出现急加速情况,加剧突发事故的后果,存在重大的事故隐患。针对此危险情况,本文提出了一种防误踩加速踏板的智能系统。该系统通过利用线位移传感器实时采集油门踏板变化率,当油门踏板变化率超过ECU中所设定的阈值时,ECU将自动开启制动系统对车辆进行制动,保证车辆的驾驶安全性。实际试验结果表明,本系统在误踩油门踏板达到设定阈值时能够自动开启车辆制动系统,避免事故的发生。     

防汽车油门误踩制动控制系统设计

为防止驾驶员在紧急制动时误将油门踏板当作制动踏板踩踏而导致的交通事故,以油门位置传感器的电压信号及其变化率作为判别参数,以STM32单片机为核心设计了一种防油门误踩制动控制系统。通过在不同的车型上安装该系统,以不同年龄、性别和驾驶习惯的驾驶员进行了油门误踩试验。试验结果表明:该系统能准确判别汽车是否处于油门误踩状态,并能在误踩状态下执行制动操作,有效防止误踩油门导致的交通事故。     

具有自锁和被动复位功能的加速踏板

文章针对手动挡汽车的加速踏板安全性能不良的现状,在不改变驾驶员操作习惯的基础上,对原有的离合器踏板和加速踏板提出了一个改进方案。该方案的思路是:利用摩擦片实现加速踏板的自锁,利用离合器与加速踏板的联动实现加速踏板的被动复位。改进后的加速踏板可以缩短紧急制动时间,减少紧急制动情况下驾车人误踩加速踏板的概率,使驾驶变得更安全、更省心。     

汽车防误踩加速踏板电控系统设计

文章分析了汽车防误踩加速踏板系统研究现状,剖析了误踩加速踏板的关键因素,并从信息采集单元、信息处理单元和动作执行单元等三个方面阐述了该装置电控系统的设计方案,对开展相关研究、减少因误踩加速踏板引发的交通事故,均具有一定指导作用。     

汽车防误踩加速踏板强制制动装置

文章介绍了作者自主研究的——汽车防误踩加速踏板强制制动装置(专利号ZL201120261194.2)。该装置能有效防止驾驶员在遇到紧急情况时错把加速踏板当作制动踏板踩踏而引发的交通事故。     

汽车安全加速踏板的设计与制作

<正>一、汽车安全加速踏板的研究意义在汽车高速发展的今天,交通事故也随之不断地上升,其中,据相关统计显示,因误踩加速踏板所造成的侧面碰撞、追尾碰撞等交通事故约占事故发生率的12.6%。在这些交通事故中,这类车祸产生的原因有相当一部分是由于驾驶员在应对突发危险时,临危处置不当所致。驾驶员在驾驶车辆过程中,错误地把加速踏板视作制动踏板进行制动,从而导致了事故的发生。在这类事故中,驾驶员对汽车操控技术不熟练是引发该事故发     

基于运行数据的电动客车误踩加速踏板状态识别研究

驾驶人误踩加速踏板导致的电动客车交通事故时有发生,影响因素复杂。为准确识别误踩加速踏板行为,提醒电动客车驾驶人安全驾驶,基于电动客车车载终端采集的车辆运行状态数据,提取9项与误踩加速踏板行为相关的驾驶特征,采用随机森林算法模型对电动客车误踩加速踏板状态进行识别,结果表明整体的识别准确率为99%,召回率为0.99,表明99%的误踩加速踏板行为可被识别出来。实验表明采用随机森林算法进行误踩加速踏板状态识别具有较好的效果,且与逻辑回归、Adaboost等识别算法相比,具有准确率、召回率和精确率高等特点。该方法利用电动客车的运行数据进行分析,简单高效成本低,具有一定的可行性和实用性。     

电控汽车防误踩加速踏板装置的设计

文章提供了一种误踩加速踏板的判定方法,进行了理论制动距离分析,介绍了一种自主设计的电控防误踩加速踏板自动制动装置。该装置能较好地减少和避免因误踩加速踏板而引发的交通事故。     

汽车油门踏板防误踏装置设计方案

<正>踩制动踏板是驾驶中出现频率较高的操作,而制动踏板旁就是油门踏板,在遇到紧急情况时,驾驶者误把油门踏板当作制动踏板的事例屡见不鲜。尽管这种误操作的概率仅为万分之一,但是一旦发生将可能引起严重的交通事故。据调查显示,很多交通事故均是由于将油门踏板误当制动踏板所引起的。基于此,有必要设计出一种防止驾驶员误踩油门踏板的紧急纠错装置,当发现这一误操作时,该装置将自行切断汽车供油,同时自动制动,从而     

雪佛兰故障案例分析汇编（十二）

故障现象：向右打转向后猛一踩加速踏板，底盘会发出“嘣”的一声。 故障诊断：经试车发现，异响好像来自左侧，如果向右转向时不猛踩加速踏板，异响不出现，直行时加速或紧急制动也没有异响。由此分析异响可能是由于转向加速时车轮受到较大的侧向力，该力传导到悬挂系统、转向系统和车身时，某两个机件发生干涉，碰在一起产生异响，当直行或转向时不猛踩加速踏板，车轮受到的侧向力比较小，这两个机件之间仍保持着安全的距离，不发生干涉，所以没有异响。     

一种汽车ESP仿真模型的研究

基于Pacejka的"魔术公式"轮胎模型,建立了包括汽车纵向与横向移动、横摆、侧倾和4个车轮的转动的8自由度动力学模型.设计了由汽车仿真模型和驱动系统、四通道制动系统、制动踏板、转向盘与油门踏板等实物以及控制器(ESP)等部分组成的半实物仿真平台.以侧向加速度与横摆角速度为仿真控制变量对模型进行仿真测试.仿真与实车测试数据相当接近,为ESP的研究提供了有效的模型.     

防误踩油门装置的设计构想

针对部分实习驾驶员在紧急情况下误将油门踏板当制动踏板急踩的现象,提出加装防误踩油门装置的设计构想,并通过实车运行验证其可行性。     

ISG hybrid powertrain: a rule-based driver model incorporating look-ahead information

According to European regulations, if the amount of regenerative braking is determined by the travel of the brake pedal, more stringent standards must be applied, otherwise it may adversely affect the existing vehicle safety system. The use of engine or vehicle speed to derive regenerative braking is one way to avoid strict design standards, but this introduces discontinuity in powertrain torque when the driver releases the acceleration pedal or applies the brake pedal. This is shown to cause oscillations in the pedal input and powertrain torque when a conventional driver model is adopted. Look-ahead information, together with other predicted vehicle states, are adopted to control the vehicle speed, in particular, during deceleration, and to improve the driver model so that oscillations can be avoided. The improved driver model makes analysis and validation of the control strategy for an integrated starter generator (ISG) hybrid powertrain possible.     

基于交通信息的电动汽车制动策略及仿真

为了提高滑行能量回收经济性和踏板制动安全性、舒适性,基于交通信息,提出了电动汽车(EV)制动协调策略。分析了滑行制动的经济性,由交通信息和汽车行驶状态确定滑行制动强度;由道路信息和前方车辆信息建立汽车安全距离模型和碰撞预警策略,利用预警信息对滑行制动和踏板制动强度进行协调。对本策略进行仿真验证。结果表明:利用交通信息的滑行策略,在通行良好工况下综合能耗减少1.1%,拥堵工况下减轻驾驶员的制动疲劳;预警和协调策略避免了频繁预警,减小了紧急避撞触发几率。因此,利用交通信息能够辅助驾驶员进行更加合理的制动。     

Subjective evaluation of engine acceleration sound with driving simulator

The vehicle acceleration performance, the accelerator pedal controllability etc. have influence on the engine sound evaluation besides the sound level and quality. Subjective evaluation of the engine sound by the design of experiments was conducted with a driving simulator. As a result, the effects of the vehicle performance and the accelerator pedal controllability for the engine sound evaluation were measured quantitatively. It became clear that these factors could improve both “quiet feeling” and “sporty feeling” which show the evaluation of engine sound.     

Energy recovery based on pedal situation for regenerative braking system of electric vehicle

ABSTRACT

Energy recovery is a key technology to improve energy efficiency and extend driving range of electric vehicle. It is still a challenging issue to maximise energy recovery. We present an energy recovery mode (mode A) which recovers braking energy under all situations that accelerator pedal (AP) is lifted, brake pedal (BP) is depressed, as well as AP and BP are released completely; and propose a control strategy of regenerative braking based on driver's intention identified by a fuzzy recognition method. Other two modes: (1) recovery braking energy only the BP is depressed (mode B), (2) no energy recovery, have been studied to compare with mode A. Simulations are carried out on different adhesion conditions. Recovered energy and driving range are also obtained under FTP75 driving cycle. Road test is implemented to validate simulation results. Results show that mode A can improve energy recovery by almost 15.8% compared with mode B, and extend driving range by almost 8.81% compared with mode B and 20.39% with the mode of no energy recovery; the control strategy of regenerative braking can balance energy recovery and braking stability. The proposed energy recovery mode provides a possibility to achieve a single-pedal design of the electric vehicle.     

防误将油门当刹车结构的研究

驾驶汽车过程中,错踩油门(油门当刹车),引发的交通事故屡见不鲜。本设计结构根据驾驶员紧急制动时,踩踏刹车踏板的力远远大于踩踏油门踏板力这一事实,从而导致节气门开度不同,通过传感器测量误踩油门时节气门开启的角度、角速度、角加速度这三个参数的模拟量,并将信号传到控制器,与试验得到的临界值比较,判断是否误踩油门,若是,则发送命令到执行器进行强制制动,防止此类交通事故的发生。     

A yaw-moment control method based on a vehicle's lateral jerk information

Previously, a new control concept called ‘G-vectoring control (GVC)’ to improve vehicle agility and stability was developed. GVC is an automatic longitudinal acceleration control method that responds to vehicle lateral jerk caused by the driver's steering manoeuvres. In this paper, a new yaw-moment control method, which generates a stabilising moment during the GVC command and has positive acceleration value and the driver's accelerator pedal input is zero, was proposed. A new hybrid control, which comprises GVC, electric stability control and this new control, was constructed, and it was installed in a test vehicle and tested on a snowy surface. The very high potential for improvement in both agility and stability was confirmed.     

Development of a semi-empirical program for predicting the braking performance of a passenger vehicle

Since the invention of automobiles, the need to know the braking performance of vehicles has been acknowledged. However, because there are numerous design variables as well as nonlinearities in the braking system, it is difficult to predict the performance accurately. In this paper, a computational program is developed to estimate the braking performance numerically. This synthetic braking performance program accounts for pedal force, pedal travel and deceleration of braking parts, such as master cylinder, booster, valve, brake pad, rotor, and hoses. To improve the accuracy of program, a semi-empirical model of a braking system is introduced by using the empirical test data of pad compression, hose expansion and the friction coefficient between the pad and rotor. The accuracy of the estimation is evaluated by comparing it to the actual vehicle test results. The developed program is easy for the brake system engineers to manipulate and it can be used in the development of new vehicles by incorporating the graphical presentations.