基于乘用車電動助力轉向系統(tǒng)研究

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目 錄
摘要 汽車電動助力轉向（EPS）系統(tǒng)是汽車行業(yè)近期年出現(xiàn)的新型動力轉向系統(tǒng)。與傳統(tǒng)的動力轉向系統(tǒng)相比較，EPS具有更加簡單的結構、低成本、高靈活性、更能滿足汽車轉向性能的要求，在轉向操作的安全性、舒適性和環(huán)保、節(jié)能等方面具有顯著的優(yōu)越性。EPS主要由扭矩傳感器、車速傳感器、電控單元（ECU）、助力電動機、電磁離合器以及減速機構等部分組成。在特定的控制算法協(xié)助下，從而實現(xiàn)助力轉向的功能。
EPS可解決小型汽車轉向輕便性和靈敏性的矛盾, 使駕駛員在汽車低速行駛時獲得較大助力, 高速行駛時獲得較強的路感。由ECU根據(jù)轉向盤轉矩信號控制電動機離合器, 使電動機在不需要助力時停止工作, 降低了能量消耗，該系統(tǒng)能滿足不同車速下獲得不同助力特性的要求。
本文首先介紹了目前EPS在國內外的發(fā)展現(xiàn)狀和趨勢，以及國內外研究的熱點和難點。然后，本文闡述了電動助力轉向系統(tǒng)的機械結構和組成，描述了電動助力轉向系統(tǒng)分類以及優(yōu)缺點。然后然后對EPS的硬件系統(tǒng)進行了設計，其中包括驅動電路，傳感器采集電路等。最后，本文對EPS的控制策略進行了探討，并且對EPS軟件部分進行了設計，通過流程圖的形式表現(xiàn)出來。

關鍵詞：EPS,電動助力轉向,控制策略,控制算法


Based on vehicle electric power steering system research
Abstract Electric power steering (EPS) system is a new power steering system in recent years. Steering and traditional dynamic comparison, EPS has the advantages of simple structure, low cost, good flexibility, can fully meet the performance requirements of automotive steering, showed a significant superiority insteering operation comfort, safety and energy saving, environmental protection etc.. The EPS system consists of the torque sensor, speed sensor,electronic control unit, brushless DC motor, electromagnetic clutch and gear box parts. In the software and the corresponding control algorithm under the assistance, to realize the power steering function.
The electric power steering (EPS) system can solve the contradiction between steering handiness and delicacy that exists in small type of cars. It enable the driver to obtain stronger road sense when drive in high speed and bigger assist when drive in slow speed. According to by ECU to dish torque signal control motor clutch, make the motor when in need not stop working, reduce boost of energy consumption, this system can satisfy different speeds get different dynamical characteristics requirement.
This paper first introduces the current EPS in the domestic and foreign development status and trends, as well as the domestic and foreign research hotspots and difficulties. Then, this paper expounds the electric power steeringmechanical structure and composition of the system, describes the electric power steering system classification and the advantages and disadvantages of. Then the hardware system of EPS is designed, including the drive circuit,sensor circuit etc.. Finally, the control strategy of EPS are discussed, and the EPS software was designed, through the form of flow charts show.

Key words EPS,Electric power steering,Control strategy,Control algorithm