Electric loading test device and method for automobile steering system

Abstract

The invention provides an electric load test device for automobile steering system. A driving speed signal and a steering wheel rotation angle which is detected by a rotation angle sensor or a displacement sensor are inputted in a controller. According to a vehicle model, the controller calculates and generates a dynamic steering system loading command force signal in real time. The loading command force signal, a practical loading force signal detected by a tension and pressure sensor, and the rotation angle or displacement signal detected by the rotation angle sensor or the displacement sensor are all together inputted in a feedforward compensation module and a PID force closed-loop control module (control scheme 1) or a two freedom degree internal mold force control module (control scheme 2) of the controller to calculate a loading force control signal which is used for loading rectilinear moving force on the gear rack of the steering device of the steering system. The electric load test device has quick system response speed, and can correctly simulate the returnable force of the steering system and high frequency (20Hz-40Hz) vibratory force caused by a plurality of interference factors such as the shimmy of the steering wheel and uneven road surface and so on under varieties of running conditions.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and relates to a loading test device, in particular to an electric loading test device for an automobile steering system. Background technique [0002] Currently, the loading systems for testing the performance of automobile steering systems such as EPS systems mainly use passive loading methods, such as spring loading, etc., and active loading methods, such as hydraulic loading or pneumatic loading. Spring loading simulates the ground resistance when the car turns by adjusting the preload of the spring. However, the ground resistance simulated by spring loading is linearly related to the displacement of the spring and does not change with the speed of the vehicle. During the test, it cannot reflect the tires and the ground in real time. contact relationship between them. The steering system loading device that uses hydraulic or pneumatic loading can make up for the shortcomings of the above...

AI Technical Summary

Problems solved by technology

Spring loading simulates the ground resistance when the car turns by adjusting the preload of the spring. However, the ground resistance simulated by spring loading is linearly related to the displacement of the spring and does not change with the speed of the vehicle. During the test, it cannot reflect the tires and the ground in real time. contact relationship between

The steering system loading device that uses hydraulic or pneumatic loading can make up for the shortcomings of the above-mentioned passive loading device, but due to the strong nonlinearity and poor dynamic response of the hydraulic and pneumatic loading device itself, it will have an adverse effect on the performance of the loading system. It cannot meet the requirements of subjective and objective evaluation of the steering system under various driving conditions

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