电动助力转向系统的研制

【作者】 姚胜华；

【导师】 魏建勤；

【作者基本信息】 浙江大学 ， 动力机械及工程， 2004， 硕士

【摘要】 随着高速公路的出现，汽车车速大幅度提高，汽车高速稳定性问题日益凸现。原有的机械系统无法解决这个问题，因而出现了助力转向系统。原有的电液助力系统体积大、能耗高，而电动助力转向系统在能改善操纵稳定性的同时具有体积小、效率高、绿色环保、装配简单等优点，已成为汽车电子系统的一个重要发展方向。 本文的涉及的研究内容主要有： 对电动助力转向系统的发展作简要的说明，在对汽车电动助力转向的原理深入分析的基础上，对汽车电动助力转向的控制策略进行了详细的阐述，并确定本文中所采用的控制方法。 在汽车转向控制策略已经确定的基础上，详细介绍电动助力转向系统方案的确定、硬件电路板的设计以及试验台架的研制。 详细介绍了实现前面的既定的控制策略的软件设计方法。本文控制软件采用汇编语言编写以实现实时控制，在实现了主要控制功能的情况下，增加各附属功能，提高了整个控制系统的可扩展性。 本文最后分析了试验结果及介绍调试软、硬件环境。试验结果表明本文提出的控制策略能够有效的控制电动助力转向，实现了助力控制和回正控制。 本文有两点创新： (1) 确定了电动助力转向系统的控制方案，提出了电动助力转向的控制策略，采用的是电流闭环控制策略，其中反馈电流信号由采样电阻获得； (2) 对模糊控制在电动助力转向控制上的应用做了初步研究，并根据所确定控制方案编制了相应的软件。更多还原

【Abstract】 As the drive speed increased greatly with the highway booming, the problem of vehicle’s high speed stability is becoming more and more serious. Traditional mechanical steering systems can’t solve this problem, so power assistant steering systems have been developed. The existent Power Assistant Steering systems are low effective. Instead, the Electric Power Steering (EPS) has effective handling and stability in high speed and some other advantages. It has become a promising way in vehicle electric systems.The research content and conclusion involved in this paper are as follows:The development history of EPS was introduced. The control strategy of EPSwas studied and certain control strategy was adapted after theory of EPS was analyzed deeply. Fuzzy control used in EPS control strategy was studied in details.The whole EPS system including the hardware design and EPS bench experiment environment was developed on the basis of the adapted control strategy.The software to fulfill the control strategy was studied especially. Because it was a real-time control process, the assemble language was adapted. Besides the fulfillment of the main function required in this control strategy, lots of affiliated functions were added. So, the expansibility of the whole system was improved.At last, the experiment results were analyzed and the debug software and hardware environment was introduced. The results showed that control strategy can make EPS work well and that Power assistant control mode and Returnable control mode were fulfilled.Two Innovative points in this paper were presented:1. The design of EPS was determined, and control strategy was developed. Current closed loop control strategy with current sensor was adapted, andfeedback current was acquired with sampling resistance instead of Hall sensor.2. A preliminary study was done on the application of fuzzy control in EPS. Corresponding software was offered to fulfill the control strategy.更多还原