Front and rear axle same-direction steering method and steering system

Abstract

The invention provides a front and rear axle same-direction steering method of a 4X4 electromechanical liquid all-wheel steering system. The method is characterized in that a first connector oil way and a third connector oil way in a rear axle steering integrated valve set are smooth, a second connector oil way and a fourth connector oil way in the rear axle steering integrated valve set are smooth, a rod cavity of an unlocking oil cylinder is filled with oil, and a mechanical lock is driven to rotate upwards around a rotating shaft to complete unlocking; a controller makes a two-position two-way electromagnetic valve and a valve be powered on; pressure buildup of a rear axle steering hydraulic cylinder is realized; when a driver turns a steering wheel, a steering wheel angle sensor sendsa steering wheel angle signal to the steering controller; a control system calculates target displacement of the rear axle steering hydraulic cylinder, accurately achieves a displacement stroke of therear axle steering hydraulic cylinder by controlling a current of a three-position four-way proportional reversing valve, pushes a left steering rocker arm to rotate through a ball pin, and drives the rear axle steering rod system to achieve the same-direction steering of a rear axle along with a front axle. A brand-new calculation mode of a piston telescopic target displacement value of the rearaxle steering hydraulic cylinder is researched and developed, and the piston telescopic target displacement value of the rear axle steering hydraulic cylinder is accurately calculated.

Description

technical field [0001] The patent of the invention relates to a high-reliability electromechanical-hydraulic all-wheel steering system suitable for wheeled vehicles, which belongs to the fields of mechanical, hydraulic and motor vehicle applications. Background technique [0002] Wheeled equipment is an important part of the army's weapon equipment system, and it is an important land mobile platform for the land, sea and air forces to realize the development strategy of "global mobility, three-dimensional protection, multi-dimensional and multi-energy". Vehicle mobility, broadly speaking, refers to the ability to quickly reach space and regions, including tactical mobility and strategic / combat mobility. For wheeled vehicles, the improvement of mobility is more focused on improving soft ground and random off-road ground. Passing ability, plateau and mountain driving performance, air transport performance, etc. The essence of the wheeled vehicle steering system is based on th...

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Problems solved by technology

[0004] (2) Compared with engineering vehicles, wheeled vehicles have more complex working conditions and harsher environments. The response characteristics and impact resistance of the follow-up steering axle are common issues that affect vehicle handling stability and safety.

[0006] From the above comparison, the variable vehicle structure, complex application environment, and harsh service conditions of wheeled vehicles have brought great challenges to the reliable application of all-wheel steering technology on wheeled vehicles. The technical framework of the all-wheel steering system of engineering vehicles cannot meet the requirements of use. Therefore, it can simultaneously have the dynamic response and impact resistance of the follow-up steering axle in complex environments, and the median steering stiffness of the follow-up steering axle under nonlinear loads and The all-wheel steering system with the three core capabilities of the active return of the follow-up steering axle under the condition of system failure and vehicle damage will become a high-reliability all-wheel steering system suitable for wheeled vehicles

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