Four-wheel steering system and control method thereof

Abstract

The invention discloses a four-wheel steering system which comprises an electronic control unit and an executing unit. The electronic control unit comprises a controller ECU and a steering wheel rotation angle sensor, wherein the steering wheel rotation angle sensor is installed on a steering shaft of a steering wheel and is used for transmitting a steering signal to the controller ECU. The executing unit comprises steering transmission mechanisms, a steering motor and a double-arm track rod, wherein the steering transmission mechanisms are arranged on wheels, the steering motor is fixed on a vehicle body or a vehicle frame, an output shaft of the steering motor is provided with a driving gear which is meshed with a driven gear of the steering transmission mechanisms, the top end of a driven gear shaft is fixed on the vehicle body or the vehicle frame through rolling bearings, and the bottom end of the driven gear shaft is connected with the double-arm track rod which is connected with the wheels through a knuckle. The controller ECU outputs the steering signal to the steering motor. The steering system is an electronic control four-wheel steering system which is convenient to arrange and small in occupied space and is mainly composed of the motor and the like.

Description

technical field [0001] The invention relates to an automobile steering system, in particular to an electronically controlled 360-degree four-wheel steering system. Background technique [0002] Automobile steering system is a key component of the vehicle, which not only affects driving comfort, but also is an important part of driving safety. The traditional two-wheel front axle steering system is gradually unable to respond due to slow response, inflexible steering, and poor directional stability when driving at high speeds. To meet people's increasingly higher requirements for vehicle active safety, an efficient steering system is urgently needed to achieve good vehicle steering safety. In this situation, four-wheel steering (Four-Wheel Steering, referred to as 4WS) system came into being. [0003] Its structure of the four-wheel steering system that uses at present is that a set of steering gear is installed on rear suspension, is called rear wheel steering mechanism. W...

AI Technical Summary

Problems solved by technology

[0005] Most of the 4WS systems currently in use are mechanical 4WS systems. Due to the mechanical connection of the front and rear wheel steering systems, this system has a large working force and reliable transmission. However, due to the shortcomings in structural design and vehicle layout, And there are defects such as vibration and noise during the movement of the car, making it difficult for the mechanical 4WS system to adapt to the requirements of modern cars in terms of lightweight and ride comfort

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