Multi-axle vehicle as well as electro-hydraulic servo steering system and steering control method thereof

Abstract

The invention discloses an electro-hydraulic servo steering system and a steering control method of a multi-axle vehicle and the multi-axle vehicle with the steering system. The electro-hydraulic servo steering system comprises a hydraulic steering system and an electric control system, wherein the hydraulic steering system comprises a variable pump, power-assisted steering oil cylinders and a servo proportional valve; the power-assisted steering oil cylinders are at least arranged on various rear steering axles; the servo proportional valve is used for controlling the trend of an oil path and the flow adjustment; the electronic control system comprises a lower controller and an upper controller; the lower controller is in signal connection with the servo proportional valve on each steering axle and forms closed loop control; and the upper controller is used for calculating a target corner of each steering axle according to a first axle corner and a steering mode. According to the invention, the electronic control systems of a two-stage controller is optimized, so that the servo proportional valve and the lower controller form a small closed loop; the lower controller with high frequency response is matched with the servo proportional valve to ensure the precision; and a programmable logic controller is used for main calculation work and transmitting a corner instruction to the each lower controller. The invention has the advantages of simple structural arrangement, safety, reliability and favorable control stability.

Description

technical field [0001] The invention relates to a steering system and a steering control method of a multi-axle vehicle, and also relates to a multi-axle vehicle with the electro-hydraulic servo steering system. Background technique [0002] The steering system of a vehicle is directly related to the safety, maneuverability and handling stability of the vehicle. [0003] With the development of heavy-duty vehicles, the load of the whole vehicle is getting bigger and bigger, which requires an increase in the number of axles, and the body is getting longer and longer. In order to reduce the minimum steering radius and driving resistance, and reduce tire wear, on the one hand, the number of steering bridges must be increased, and on the other hand, the steering wheels are required to coordinate with each other when turning. [0004] Traditional multi-axle vehicles use a hydraulic power-assisted rod system transmission and steering system, which occupies space for the layout of...

AI Technical Summary

Problems solved by technology

[0004] Traditional multi-axle vehicles use a hydraulic power-assisted rod system transmission and steering system, which occupies space for the layout of the frame, and the rod system is easily deformed, and the vehicle may swing when driving at high speed and has poor stability.

In recent years, with the rapid development of electro-hydraulic technology, the electro-hydraulic control steering system has been used in multi-axle vehicles. However, due to the limitation of the response frequency of the general electro-hydraulic proportional solenoid valve, the steering error is relatively large, especially High dynamic error, which greatly affects steering performance and tire life

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