Hydraulic auxiliary control electric independent steering system and electric vehicle

Abstract

The invention discloses a hydraulic auxiliary control electric independent steering system and an electric vehicle. The electric independent steering system comprises electric independent steering mechanisms, a hydraulic control system and an electronic control unit. The two sets of electric independent steering mechanisms are symmetrically distributed at the positions of a front shaft and a rearshaft, steering rocker arms of two sets of electric independent steering assemblies are connected with piston connecting rods of locking hydraulic cylinders respectively, and cylinder bodies of the two sets of symmetrically-arranged locking hydraulic cylinders are coaxially and fixedly connected through a central connecting rod. In the hydraulic control system, after an oil outlet of a hydraulic oil pump is connected with a one-way valve, a main oil way is divided into a front branch oil way and a rear branch oil way through a proportional diverter valve, and the branch oil ways are connectedwith the two sets of locking hydraulic cylinders through two three-position four-way electromagnetic valves respectively; the electronic control unit is composed of a steering motor controller, an electromagnetic valve controller, a driving motor controller and a locking hydraulic cylinder linear displacement sensor which are in communication connection through a CAN bus. The driving safety of vehicles and the reliability of the electric independent steering system can be improved at the same time.

Description

technical field [0001] The invention belongs to the technical field of automobile independent steering control, and in particular relates to an electric independent steering system with hydraulic auxiliary control and an electric vehicle. Background technique [0002] With the vigorous development of the global automobile industry, automobile intelligence and electrification have become a trend, and the requirements for automobile performance and technology are also increasing. The traditional mechanical structure of automobiles has changed, and electric independent steering mechanisms should appear in the public eye. . [0003] The electric independent steering mechanism can be applied to various forms of automobiles, especially in distributed in-wheel drive electric vehicles. This kind of vehicle cancels components such as differentials and half shafts, and has a more compact structure and high transmission efficiency. The ideal control algorithm can improve the stability...

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Problems solved by technology

[0005] For example, although the independent steering mechanism proposed by the patent CN206125145U can realize different independent steering function requirements, most of its independent steering mechanism belongs to the unsprung mass, and the arrangement of its steering mechanism will have an adverse effect on the ride comfort and handling stability of the vehicle.

[0006] In addition, although the independent steering mechanism involved in the patent CN1702007A can realize four-wheel independent steering and independent control, and can ensure that the vehicle always rotates around the steering center during the steering process, reducing tire wear, the left and right wheels are independently steered The mechanism cancels the mechanical connection between the steering wheel and the steering mechanism. As a result, when the steering motor on one side fails and loses normal operation ability, the left and right steering wheels cannot be converted from independent movement to overall movement, which greatly reduces the driving safety and ride comfort of the vehicle.

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