Assisted steering system with active steering function and control method thereof

Abstract

The invention discloses an auxiliary steering system with an active steering function and a control method thereof. The system comprises a steering mechanical module, a steering angle control module,an electro-hydraulic assist module, an ECU control module and a vehicle-mounted sensor which are sequentially connected. The control method of the system is as follows: a drive transmits a driving intention by turning the steering wheel, the ECU control module determines a steering intervention is required according to that vehicle speed, yaw angular velocity, lateral acceleration, center-of-masslateral deflection angle, pavement information and the like, a certain steering angle is added to the steering system through the steering angle control module (the direction is determined accordingto the control system) if so, the steering system is assisted by the electro-hydraulic assisting module according to the actual steering angle of the steering system, and the rotational speed of the driving motor of the hydraulic pump is calculated and determined by the ECU control module; The intelligent steering system of the auxiliary steering function provided by the invention can help the driver to improve the road feeling, improve the active safety of the vehicle, and ensure the safety of the life and property of the driver through the auxiliary active steering.

Description

technical field [0001] The invention relates to the field of automobile intelligent steering systems, in particular to an auxiliary steering system with an active steering function and a control method thereof. Background technique [0002] The steering system is an important component of the vehicle control system, and plays an important role in the safe driving of the vehicle. The development of the steering system has gone through mechanical steering, hydraulic power steering, electronically controlled hydraulic power steering, electric power steering, active steering, wire control steering, etc. Among them, the electronically controlled hydraulic power steering system has both variable power assist characteristics and the ability to provide large power assist. Advantages, it is widely used in commercial vehicles with large front axle load. [0003] However, most commercial vehicle steering systems currently on the market are constant flow electronically controlled hydra...

AI Technical Summary

Problems solved by technology

[0003] However, most commercial vehicle steering systems currently on the market are constant-flow electronically controlled hydraulic power steering, and the speed of the motor is not controlled.

In this way, when driving at high speed or in a straight line, the motor is still running at high speed, resulting in waste of energy. The power steering is based on the natural characteristics of the motor, and the driver feels poor in driving. It is impossible to control the variable transmission ratio according to the various conditions encountered by the car during driving, so it cannot take into account the steering sensitivity of the car at low speeds and the stability of the steering at high speeds, and it cannot be used in emergency conditions. Ensure the active safety of the car; Third, the existing research on automatic driving is mainly aimed at cars with small front axle loads, and less research on commercial vehicles with large front axle loads, while electric buses, long-distance trucks, etc. The market demand for driving is increasing

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