Active steering system combined with electrical power-assisted steering function and control method thereof

Abstract

The invention relates to an active steering system combined with an electrical power-assisted steering function and a control method thereof, belonging to the field of vehicle steering systems. The system sequentially comprises a steering wheel, a steering input shaft, a planetary gear mechanism, a steering output shaft, a steering engine, a steering tie rod, a steering motor, a steering wheel angle sensor, a yaw velocity sensor, a lateral acceleration sensor and an ECU performing automatic steering control. The system is characterized by further comprising a steering wheel torque sensor mounted on the steering input shaft, a turbine worm retarding mechanism connected with the pinion of the steering engine, and a power-assisted motor connected with the turbine worm retarding mechanism; the ECU further receives the signal of the steering wheel torque measured by the steering wheel torque sensor and the speed signal acquired by a CAN bus so as to perform the steering system assistance and the return control as well as implement the electrically-assisted steering function. The system can improve the operation stability of the whole vehicle according to the operation condition of the vehicle, improve the road-feel of drivers, and ensure the vehicle to have stronger returnability.

Description

technical field [0001] The invention relates to the field of automobile steering systems, in particular to an active steering system used in automobiles. Background technique [0002] Automotive power steering systems include electronically controlled hydraulic power steering systems, electric power steering systems and active steering systems. [0003] Dr. Shen Rongwei's thesis "Research on the Development and Experimental Technology of Electric Power Steering System for Electric Bus" introduced a typical electronically controlled hydraulic power steering system, which introduces the vehicle speed signal into the hydraulic steering system to obtain the speed-sensitive power assist characteristics, and adds a controller and executive body. According to the vehicle speed signal, the controller changes the power assist characteristics of the electro-hydraulic conversion device to achieve greater power assist at low speeds or sharp turns to meet the requirements of steering po...

AI Technical Summary

Problems solved by technology

[0006] At present, the existing BMW and other active steering systems still use the electronically controlled hydraulic power steering system to achieve vehicle speed assist, so they cannot overcome the shortcomings of the traditional electronically controlled hydraulic power steering system. Disadvantages such as torque variation, no steering wheel return control, hydraulic system leakage and poor performance at low temperature

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