一种用于电动汽车的真空助力制动系统设计

文中给出了某型电动轿车完整的制动系统的计算参数,并对真空助力制动系统的性能进行了分析计算,并根据计算结果,设计了电动真空助力制动系统。通过整车道路试验验证,所设计的电动真空助力制动系统合理。     

一种用于电动汽车的真空助力制动系统设计

本文给出了某型电动轿车完整的制动系统的计算参数，并对真空助力制动系统的性能进行了分析计算，并根据计算结果，设计了电动真空助力制动系统。通过整车道路试验验证，所设计的电动真空助力制动系统合理。     

基于MATLAB的汽车制动系统设计与分析软件开发

根据整车制动系统开发需要,利用MATLAB平台开发了汽车制动系统的设计和性能仿真软件。该软件用户界面和模块化设计方法可有效缩短开发时间,提高设计效率。并以上汽赛宝车为例,对该软件的可行性进行了验证。     

电动真空助力制动系统设计

与传统内燃机汽车相比,电动汽车缺少真空助力制动系统所需的真空源,需增加一个具有足够排气量的电动真空发生系统。现以某型纯电动轿车为例,给出了完整的制动系统的计算参数,对真空助力制动系统的性能进行了分析计算,并根据计算结果,设计了间歇性工作的真空发生系统。整车道路试验表明,所设计的电动真空助力制动系统合理。     

电动真空助力制动系统设计

与传统内燃机汽车相比，电动汽车缺少真空助力制动系统所需的真空源，需增加一个具有足够排气量的电动真空发生系统。现以某型纯电动轿车为例，给出了完整的制动系统的计算参数，对真空助力制动系统的性能进行了分析计算，并根据计算结果，设计了间歇性工作的真空发生系统。整车道路试验表明，所设计的电动真空助力制动系统合理。     

某轿车盘式制动器设计

基于某轿车制动系统整车匹配进行优化设计,旨在满足相关法规下,简化制动器设计过程。通过将整车性能参数与盘式制动器设计有机结合,制定盘式制动器设计策略。通过计算在制动过程中汽车制动系统各个车轮的最大制动力矩和选定该轿车同步附着系数,确定了盘式制动器的主要部件关键设计参数和材料,并经计算验证了制动器各项性能均符合相关法规要求。最后,应用计算机辅助设计（CAD）软件和UG软件完成主要零件图的绘制和三维建模。从而在满足相关法规要求下,优化了汽车制动器设计流程,同时为后续制动噪声等问题研究奠定基础。     

桑塔纳2000轿车制动系统

本文介绍了桑塔纳２０００轿车制动系统的性能，结构及特点。对整车制性能和制动器热负荷的计算结果作了说明，最后简要阐述了制动防抱系统的优点及用于桑塔纳２０００轿车的现实意义。     

前后悬架抗制动点头率和抗加速仰头率计算

文中介绍了整车制动点头性能和加速仰头性能,以及二者对整车性能及乘员舒适性的影响.通过整车在制动过程和加速过程中的受力情况对制动点头和加速仰头进行理论分析.以某车型为例,对抗制动点头率和抗加速仰头率进行重点分析计算,为整车设计过程中对制动点头程度和加速仰头程度的控制提供依据.     

电子控制的大客车气制动系统

为克服现有大客车气制动系统的问题,设计出一种电子控制的气制动系统.这种电子控制的气制动系统利用传感器感知制动踏板的动作并且把它线性转化为制动阀的开度.另外,这种电子控制的后轮气制动系统还可以实现在紧急情况下的自动制动功能,提高了整车的制动安全性能.     

汽车液压制动系统优化设计平台开发

根据企业实际项目需要,通过面向对象的程序设计思想,利用Visual C++开发了汽车液压制动系统计算分析软件。介绍了该软件的功能结构、设计流程等。以某车制动系统设计计算为例,对软件的计算、分析、参数化建模能力进行了验证。该软件平台通过ACCESS数据库,储存了大量经验数据和制动法规来辅助用户设计开发,能够精确计算制动系统的20余项内容以全面分析整车制动性能。     

Control of Wheel Slip Ratio Using Sliding Mode Controller with Pulse Width Modulation

For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduce actuator dynamics of solenoid-solenoid valve type in system equation and derive the sliding mode control input theoretically. We propose using PWM method to compensate for the discrete nature of actuator dynamics by duty control. The effectiveness of the proposed control algorithms was confirmed by vehicle test on an in-door test bench that was specially constructed for the purpose concerned.     

Control of Wheel Slip Ratio Using Sliding Mode Controller with Pulse Width Modulation

For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduce actuator dynamics of solenoid-solenoid valve type in system equation and derive the sliding mode control input theoretically. We propose using PWM method to compensate for the discrete nature of actuator dynamics by duty control. The effectiveness of the proposed control algorithms was confirmed by vehicle test on an in-door test bench that was specially constructed for the purpose concerned.     

Design of Nonlinear Sliding Mode Controller with Pulse Width Modulation for Vehicular Slip Ratio Control

For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduced actuator dynamics in the system equation and derived the equivalent control input theoretically. We propose using the PWM method to compensate for the discrete nature of actuator dynamics by duty control. Stability of the PWM controller for sliding mode control (SMC) was theoretically checked. The effectiveness of the proposed control algorithms was confirmed by vehicle tests on an In-door test bench that was specially constructed for the purpose concerned.     

Active yaw damper for the improvement of railway vehicle stability and curving performances: simulations and experimental results

To further increase passenger train comfort and handling performances, a mechatronic approach to the design of railway vehicles is necessary. In fact, active systems on board a railway vehicle allow to push design barriers beyond those encountered with just passive systems. The article deals with the development of an electro-mechanical actuator to improve the running behaviour of a railway vehicle, both in straight track and curve. The main components of the active system are a brushless motor and a mechanical transmission, used to apply a longitudinal force between the carbody and the bogie of the vehicle. The actuator is operated in force control. Different control strategies were developed for straight track running, where the aim is to increase the vehicle critical speed, and for curve negotiation, where the goal is to reduce the maximum values of track shift forces. A mathematical model of the railway vehicle incorporating the active control device has been developed and used to optimise control strategies and hardware set-up of the active device and to estimate the increase in operating performances with respect to a conventional passive vehicle. The active control device has then been mounted on an ETR470 railway vehicle, and its performances have been evaluated during in-line tests in both straight and curved tracks.     

Active yaw damper for the improvement of railway vehicle stability and curving performances: simulations and experimental results

To further increase passenger train comfort and handling performances, a mechatronic approach to the design of railway vehicles is necessary. In fact, active systems on board a railway vehicle allow to push design barriers beyond those encountered with just passive systems. The article deals with the development of an electro-mechanical actuator to improve the running behaviour of a railway vehicle, both in straight track and curve. The main components of the active system are a brushless motor and a mechanical transmission, used to apply a longitudinal force between the carbody and the bogie of the vehicle. The actuator is operated in force control. Different control strategies were developed for straight track running, where the aim is to increase the vehicle critical speed, and for curve negotiation, where the goal is to reduce the maximum values of track shift forces. A mathematical model of the railway vehicle incorporating the active control device has been developed and used to optimise control strategies and hardware set-up of the active device and to estimate the increase in operating performances with respect to a conventional passive vehicle. The active control device has then been mounted on an ETR470 railway vehicle, and its performances have been evaluated during in-line tests in both straight and curved tracks.     

Development of an electric booster system using sliding mode control for improved braking performance

Brake systems of the future, including BBW (Brake-by-Wire), are in development in various forms. In one of the proposed hydraulic BBW systems, an electric booster system replaces the pneumatic brake booster with an electric motor and a rotational-to-linear motion mechanism. This system is able to provide improved braking performance by the design of controllers with precise target pressure tracking and control robustness for better system reliability. First, a sliding mode controller is designed using the Lyapunov function approach to secure the robustness of the system against both the model uncertainty and the disturbance caused by the master cylinder and mechanical components. Next, a simulation tool is constructed to validate the electric booster system with the proposed controller. Finally, the electric booster system is implemented into an actual brake ECU and installed in a vehicle for testing under various braking conditions. The experimental results demonstrate that the proposed controller produces faster pressure build-up performance than the conventional brake system, and its tracking performance is sufficient to ensure comfortable braking.     

燃料电池汽车整车集成的关键技术

文章在简单介绍国内外燃料电池轿车开发现状和燃料电池汽车动力及其电控系统架构定义后,结合上汽在燃料电池整车开发项目中积累的经验,从整车布置、整车热管理、整车与动力系统的参数选择与优化设计、多能源动力系统的能量管理策略优化及其控制算法的实现、制动回馈及电驱动系统的综合控制等方面阐述了燃料电池汽车整车集成开发的关键技术。     

A Versatile Flat Track Tire Testing Machine

Summary A flat track tire testing machine developed by the IMMa group is described. It permits the simulation and study of the dynamic behavior of a great variety of tires under controllable and repetitive highly dynamic realistic working conditions in the laboratory for a diversity of vehicles, from motorcycles to light trucks. The machine incorporates: – a hydraulically operated tire support and loading system with wide operating ranges; – a computer controlled brake system to simulate braking maneuvers with ABS systems; – a complete sensorial system; – a data acquisition and control system continually monitoring and acting on the experimental variables, i.e., tire and belt speed, longitudinal slip, slip and camber angles, tire pressure, tire normal force, etc. As an application example, results are presented that adjust the parameter of the magic formula for a standard 175/70 R14 passenger vehicle tire. Accurate mathematical tire models are recognized as essential for the prediction of vehicle dynamic performances using simulation tools.     

A Versatile Flat Track Tire Testing Machine

Summary A flat track tire testing machine developed by the IMMa group is described. It permits the simulation and study of the dynamic behavior of a great variety of tires under controllable and repetitive highly dynamic realistic working conditions in the laboratory for a diversity of vehicles, from motorcycles to light trucks. The machine incorporates: - a hydraulically operated tire support and loading system with wide operating ranges; - a computer controlled brake system to simulate braking maneuvers with ABS systems; - a complete sensorial system; - a data acquisition and control system continually monitoring and acting on the experimental variables, i.e., tire and belt speed, longitudinal slip, slip and camber angles, tire pressure, tire normal force, etc. As an application example, results are presented that adjust the parameter of the magic formula for a standard 175/70 R14 passenger vehicle tire. Accurate mathematical tire models are recognized as essential for the prediction of vehicle dynamic performances using simulation tools.     

Self-tuning control algorithm design for vehicle adaptive cruise control system through real-time estimation of vehicle parameters and road grade

The main purpose of this paper is to design a self-tuning control algorithm for an adaptive cruise control (ACC) system that can adapt its behaviour to variations of vehicle dynamics and uncertain road grade. To this aim, short-time linear quadratic form (STLQF) estimation technique is developed so as to track simultaneously the trend of the time-varying parameters of vehicle longitudinal dynamics with a small delay. These parameters are vehicle mass, road grade and aerodynamic drag-area coefficient. Next, the values of estimated parameters are used to tune the throttle and brake control inputs and to regulate the throttle/brake switching logic that governs the throttle and brake switching. The performance of the designed STLQF-based self-tuning control (STLQF-STC) algorithm for ACC system is compared with the conventional method based on fixed control structure regarding the speed/distance tracking control modes. Simulation results show that the proposed control algorithm improves the performance of throttle and brake controllers, providing more comfort while travelling, enhancing driving safety and giving a satisfactory performance in the presence of different payloads and road grade variations.