Drive-by-wire chassis multi-mode electro-hydraulic steering system and control method

Abstract

The invention discloses a drive-by-wire chassis multi-mode electro-hydraulic steering system and a control method. The system comprises a main steering wheel, a main steering column assembly, an auxiliary steering control mechanism, a road sensing assembly, an electric hydraulic power-assisted module, a steering control unit, an infrared sensor capable of measuring distance, a pressure sensor, aninfrared camera, an electromagnetic clutch, a steering tie rod, a steering trapezoid and steering wheels. The method comprises the steps inputting a steering wheel angle according to driving conditions; enabling an information processing unit to receive, calculate and transmit signals to a working mode decision-making unit and a steering decision-making unit; enabling the working mode decision-making unit to obtain a current working mode through comparison and input a signal into a steering decision-making unit; and entering a subsequent working mode according to a result that whether an emergency accident occurs, and driving a motor to work and completing steering. According to the invention, the hybrid advantages of electro-hydraulic power and single-motor electric power can be fully exerted, so that the main driving position is labor-saving, the reliability of the auxiliary driving position is improved, the advantages of good energy-saving characteristic, high steering control precision and the like are achieved, and the occurrence rate of accidents is reduced.

Description

technical field [0001] The invention relates to the technical field of automobile steering systems, in particular to a multi-mode electro-hydraulic steering system and a control method for a chassis controlled by wire. Background technique [0002] In order to make the motion mode of the vehicle more flexible and improve the intelligence of the vehicle, the research on the control-by-wire chassis has become a hot spot at present. However, the current control-by-wire chassis is mainly designed to optimize the traditional single steering wheel vehicle, that is, the single-mode steering system; for vehicles with multi-mode steering systems, there is no example of the application of the control-by-wire chassis technology. For vehicles that can be equipped with multiple steering wheels and steering systems, such as special engineering vehicles, coach vehicles, and off-road vehicles, the wire-control chassis can also greatly improve its performance. There has been no public report...

AI Technical Summary

Problems solved by technology

[0004] The existing co-pilot emergency intervention method usually adopts a mechanical structure. For example, Chinese patent application number 201811173388.X discloses that when an emergency occurs, the co-pilot instructor steps on the sub-brake pedal, and the main driving trainee cannot operate the main steering wheel. The practice car dual steering wheel steering control cut-off device

However, this kind of mechanical structure can only rely on the operational response ability of the co-pilot, once a mistake occurs, it will cause an accident; at the same time, vehicles with dual steering wheels on the market usually use dual hydraulic power steering or dual electronically controlled hydraulic power steering , for example, a dual steering wheel electronic control system for an electric forklift disclosed in Chinese Patent Application No. 201821765488.7, a new auxiliary direction is added, and a high-performance potentiometer is used to control the steering signal. Low power consumption, high hydraulic energy consumption, etc., and because the co-pilot position is not always manipulated, it is very likely that it will be touched by mistake and affect the running direction of the vehicle, which will affect the reliability of the vehicle steering

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