Hydraulic loading system and control method for multi-axle vehicle steering performance test bench

Abstract

The invention relates to a hydraulic loading system for a multi-axle vehicle steering performance test board and a control method. The hydraulic loading system comprises a servo proportional valve, an electromagnetic ball valve, an electromagnetic reverse valve, a hydraulic control one-way valve, an overflow valve, and servo loading cylinders; the two independent servo loading cylinders are controlled through the servo proportional valve by adopting different load signals to realize in-situ vehicle static load simulation, in-situ pressure alternating load simulation, in-situ vibration amplitude alternating load simulation and the simulation of eccentric loads suffered by tires on two sides of axles due to gravity center shift on different gradients, so that the practicability of the test board is improved; the servo proportional valve gives given preset pressure values to the servo loading cylinders to realize precise pressure control over the servo loading cylinders; the disturbance is eliminated beforehand through feedforward control, so that the added loads are kept constant in the steering process, and the test authenticity is improved; and through an electric-hydraulic combination control mode, the loading function is realized, and the operability and the test efficiency of the test board are improved.

Description

technical field [0001] The invention relates to a hydraulic loading system and control method for a multi-axle vehicle steering performance test bench, which is suitable for simulating the loading of the multi-axle vehicle steering performance test bench under various road conditions. Background technique [0002] At present, multi-axis steering technology is a key technology in the vehicle industry. Large-scale wheeled vehicles are widely used in infrastructure construction (such as large-tonnage all-terrain cranes, large-scale beam trucks and mining dump trucks and other civilian equipment) and military heavy industry. (such as large-scale missile transport vehicles, heavy-duty electronic launch vehicles and traction vehicles and other special transport vehicles). High-performance multi-axis steering can significantly improve the low-speed maneuverability and high-speed handling stability of large wheeled vehicles, which has become a key technology to measure the developme...

AI Technical Summary

Problems solved by technology

The load fluctuation condition caused by the up and down vibration cannot be effectively simulated. Secondly, the eccentric load condition caused by the inconsistent height of the left and right road surfaces cannot be effectively simulated. Low

[0006] 2) The loading part of the traditional test bench cannot guarantee that the loading force remains constant during the experiment process, resulting in limited experimental accuracy

Therefore, loading methods such as traditional hydraulic jacks and bolts will inevitably cause changes in the load, resulting in low accuracy of the load test

[0007] 3) The loading part of the traditional test bench is inconvenient in the loading operation

Most of the traditional bench test process requires manual operation to apply load to the tire, and the load is easy to change during the test process, so further manual adjustment is required to make the load meet the requirements

Therefore, the traditional bench debugging is more cumbersome, which greatly reduces the efficiency and accuracy of the experiment

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