Development of an active trailer differential braking system for car-trailer combinations

开发用于汽车-拖车组合的主动拖车差动制动系统

• 批准号: 483295-2015
• 负责人: He, Yuping
• 金额: $ 1.82万
• 依托单位: University of Ontario Institute of Technology
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=583449
• 关键词: Development; active; trailer; differential; braking

The objective of the project is to develop a conceptual design of active trailer differential braking (ATDB) systems for car-trailer combinations. Despite the safety increases provided by electronic stability control (ESC) systems, nearly all these devices are designed for single-unit vehicles and take no account of external loads, such as trailers. Car-trailer combinations exhibit reduced stability at high speeds due to their complex configurations. Compared with single-unit vehicles, car-trailer combinations show unique unstable motion modes, including jack-knifing, trailer swing, and roll-over. These unstable motion modes are the common causes for accidents occurring on highways. To date, the majority of trailers use passive mechanisms to enhance their stability at high speeds. Unfortunately, the high-speed stability of a car-trailer system cannot be guaranteed with a passive mechanism, because operating conditions vary significantly, such as the variation of trailer payload, forward speed, road conditions, etc. To enhance the performance of car-trailer combinations, General Motors of Canada Limited (GM) is researching new active safety systems for the vehicle systems. With expertise from the UOIT team, the active safety system will be designed using an innovative ATDB technique, which is built upon existing technologies of ESC for single-unit vehicles. Collaborating with the GM engineers, the UOIT team will: 1) perform numerical simulations to examine the direction performance of a typical GM passenger car with and without an embedded ESC system when it tows a conventional trailer; and 2) conduct a conceptual design of an ATDB system and evaluate the effectiveness of the safety device by numerical simulations. The research project will address the following issues for the ATDB system design: 1) finding effective ways to determine the threshold limit to actuate the ATDB system; 2) determining effective control strategies to prevent jack-knifing unstable motion mode; and 3) identifying the effects of existing ESC system embedded on a car on the stability of the resulting car-trailer system when the car is towing. The innovative research will lay a solid foundation to fabricate physical ATDB prototypes in the next project.

该项目的目标是开发一个概念设计的主动拖车差动制动（ATDB）系统的汽车拖车组合。尽管电子稳定控制（ESC）系统提供了更高的安全性，但几乎所有这些装置都是为单体车辆设计的，并且没有考虑外部负载，例如拖车。汽车-拖车组合由于其复杂的配置而在高速下表现出降低的稳定性。与单体车辆相比，汽车-拖车组合体具有独特的不稳定运动模式，包括弯折、拖车摆动和侧翻。这些不稳定的运动模式是高速公路上发生事故的常见原因。迄今为止，大多数拖车使用被动机构来提高其在高速下的稳定性。不幸的是，汽车-拖车系统的高速稳定性不能被 由于操作条件变化很大，例如拖车有效载荷、前进速度、道路条件等的变化，因此通过被动机制来保证。为了提高汽车-拖车组合的性能，加拿大通用汽车有限公司（GM）正在研究用于车辆系统的新的主动安全系统。凭借UOIT团队的专业知识，主动安全系统将使用创新的ATDB技术进行设计，该技术建立在现有的单体车辆ESC技术基础上。UOIT团队将与通用汽车工程师合作：1）进行数值模拟，以检查带有和不带有嵌入式ESC系统的典型通用汽车乘用车在牵引传统拖车时的方向性能; 2）进行ATDB系统的概念设计，并通过数值模拟评估安全装置的有效性。本研究将针对ATDB系统设计中的以下问题进行研究： 找到有效的方法来确定启动ATDB系统的阈值限制; 2）确定有效的控制策略来防止弯折不稳定运动模式;以及3）识别当汽车牵引时嵌入在汽车上的现有ESC系统对所得到的汽车-拖车系统的稳定性的影响。该创新性研究为下一步ATDB物理样机的研制奠定了坚实的基础。