The electrohydraulic flow matching (EFM) system is a competitive alternative for the traditional load sensing system to improve the operability and efficiency of mobile machinery. The energy efficiency of the EFM system can be further improved by fully opening the control valve, but the system tends to oscillate since the damping ratio is reduced dramatically. To address this problem, a pump-based compensation method is proposed to improve the dynamic performance under different working conditions. A performance indicator is defined to evaluate the dynamic behavior under the load condition with wide variation range. Using the defined indicator as the fitness function, a parameter searching method based on stability analysis and particle swarm optimization is designed to determine the optimized control parameters for dynamic improvement. A test rig with a 2-ton hydraulic excavator was built up and used to validate the proposed compensator. Boom lifting motions under different loads and speeds were carried out. The results indicated that the proposed compensator reduced velocity and pressure oscillations under different working conditions, with achieving better dynamic improvement than the traditional compensator.
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Cheng et al. (2016) studied this question.
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