Abstract
Background: The shock absorber is an important component of vehicle suspension that attenuates the vehicle vibration. It is used widely in vehicle engineering. Its running state directly affects the performance of the vehicle suspension. The test platform for developing shock absorber is the key equipment in this literature, furthermore, the controller design is the key part of the test platform.
Objective: The purpose of this study is to provide an overview of controller design and realization of test platform from many literatures and patents, and propose a novel controller development method for ensuring precision and rapidity of shock absorber test platform.
Methods: The power mechanism mathematical model of the hydraulic test platform is established to analyze the bandwidth of the test system, and the three-state feedback and feed-forward compound control strategy is proposed to increase the system bandwidth. The embedded controller with high speed digital signal processing chip as the core processor is developed to realize the real-time control of hydraulic shaking system. The embedded controller shares data with the monitoring computer through the Ethernet. The control strategy of the hydraulic system developed from the high-level language named Matlab/Simulink can generate C code executed on embedded controller.
Results: The improved hydraulic shaking platform control method is fully evaluated by simulation and experiments. The results show that the proposed compound control strategy greatly extends the system bandwidth, and the reliability and effectiveness of the developed embedded controller is verified.
Conclusion: The improved hydraulic shaking platform control algorithm has improved the precision and speed of the test platform of shock absorber. But because the executing efficient of the C code generated by Matlab/Simulink is lower than the control strategy programmed by direct C language, the stronger computing power chip must be selected as the core processor and the control strategy will be coded by low-level programming language in the future.
Keywords: Control strategy, digital signal processor (DSP), embedded control system, hydraulic test platform, rapid control prototype, shock absorber, three variable controller (TVC).
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