Abstract
Because of the advantages such as the steering sensitivity,handiness, and absorbability of the impulse from the road the power steering system is widely used since 1950's. Now the Hydraulic Powering Steering (HPS) is still mainly used in the automobile drived internal-combustion engine. But it also needs the continuing consume of fuel to keep pump running so it reduces the economy of fuel .And its complex hydraulic system pollutes the environment,makes the repairing difficult and the features couldn't be adjusted conveniently. Compared with HPS, the Electric Powering Steering system (EPS) has its special characters, such as the adjustable features, environment-friendly, energy saving and convenient maintenance, so it is developed quickly since some world famous automotive companies begin to research the EPS powering steering in 1980's.
The overall structure and working principle of the EPS was briefly described.Meanwhile,it detailed the function and principles of the all of every components; thirdly,the procession of mould buiding for three-dimensional software for CATIA;At the end,what standarded the test of EPS was speaken.