汽车电动助力转向系统是一种新型的汽车转向系统，与传统液压转向系统相

比，采用电动机直接提供助力，具有多方面优越性。它能够在各种行驶条件下提

供最佳的助力，节省燃油，利于环保．近年来已有许多中高档汽车配备了电动助

力转向系统装置，EPs研究也成为汽车工业的热门课题之一，具有重要研究价值和

巨大潜在应用前景。-Electric power steering system is a new steering system, compared with traditional hydraulic steering system using electric motor to provide assistance, with many advantages. It can be a variety of driving conditions to provide the best help, to save fuel, environmentally friendly. In recent years, there are a number of high-end cars are equipped with electrical power steering device, EPs studies have become a hot topic in automotive industry, has important research value and great potential applications.