Abstract
To improve the accuracy and actual road equivalence of vehicle performance testing using test benches, a double-drum test bench that meets the test requirements of vehicle control system prototypes and in-use vehicles was designed. Dynamic models of the single-wheel test bench and the vehicle test bench were established, and mechanisms were theoretically analyzed for single-wheel variable adhesion and vehicle load transfer for equivalent testing using the variable placement angle. The mechanism of electromechanical inertia compensation was studied to realize stepless simulation of vehicle inertia and simulate dynamic load while braking. The simulation model of the vehicle test bench system was established based on MATLAB/Simulink. Simulations were carried out to verify the anti-lock braking system (ABS) performance test functionality of the test bench under high adhesion, bisectional, and low adhesion conditions. Referring to the simulation conditions, ABS tests under actual test bench and road conditions were carried out. Results demonstrated that the mechanism of variable load transfer simulation by electromechanical inertia compensation improves the equivalent accuracy compared to that of its road test equivalent, verifying the feasibility of the simulation mechanism. This study could help further improve the accuracy and reduce the cost of vehicle performance testing, thus greatly benefitting the vehicle development and testing industry.
Highlights
Vehicle performance testing is an effective method for evaluating the technical status of vehicles for both new vehicle development and testing in-use vehicles, which helps improve new vehicle development and reduces the cost of research and development
A double-drum test bench was designed based on the electromechanical integration of measurement and control that can satisfy development testing of anti-lock braking system (ABS)/acceleration slip regulation (ASR) controller prototypes and the performance testing of in-use vehicles
A matching relationship between variable placement angle and equivalent peak adhesion coefficient was obtained, which can meet the requirements of single-wheel testing
Summary
Vehicle performance testing is an effective method for evaluating the technical status of vehicles for both new vehicle development and testing in-use vehicles, which helps improve new vehicle development and reduces the cost of research and development. Semi-physical simulation provides a real-time coupling method between physical hardware and computer virtual simulation, providing a low test cost and good real-time performance, but the test accuracy is relatively low While it is suitable for initial research of the control algorithm and prototype trial production, it is insufficient by itself. A double-drum test bench was developed in this paper based on the mechanism of variable load transfer simulation using electromechanical inertia compensation. Based on this low-cost and low-energy method, vehicle dynamic load could be simulated in a real time testing process, and the accuracy of the road test equivalence could be improved.
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