Abstract
In this paper, a digital hydraulic variable control method based on multi-way valve spool displacement feedback is proposed, which combines the advantages of low cost and high reliability of the loader fixed displacement pump hydraulic system, and the distinguished energy saving effect of the loader variable pump hydraulic system. Based on the principle of hydraulic resistance, the mathematical model of flow-pressure of multi-way valve was established. Meanwhile, the theoretical structure of a valve spool suitable for digital hydraulic system was deduced. On this basis, an improvement scheme of the valve spool was proposed in combination with machining feasibility. The simulation model of multi-way valve was established, the correctness of which was verified by experiment with the significance test method, and the valve port parameters of the multi-way valve were optimized by genetic algorithm. The simulation model before and after optimization was analyzed by AMESim software. The simulation results showed that the digital hydraulic system can basically realize the function of a variable system, and the energy consumption was significantly reduced compared with the fixed displacement pump hydraulic system. The optimized valve spool structure of the digital hydraulic system had more stable load characteristics than the fixed displacement pump system and a larger speed range. The increase range accounts for about 27% of the total stroke.
Highlights
The construction machinery hydraulic system control methods such as fixed displacement pump systems or multi-way valve hydraulic systems occupy a certain market with its cost advantage [2], due to the inevitable massive throttling and overflow losses, it does not meet the trend of energy saving and will eventually be eliminated
(3) The simulation model of a multi-way valve was established, the correctness of which was proved by experiments with the significance test method, and the valve port parameters of the multi-way valve were optimized by genetic algorithm
The digital hydraulic system configuration of loaders based on multi-way valve spool displacement feedback was proposed, and the valve spool theoretical structure suitable for the digital hydraulic system was deduced
Summary
Construction machinery is commercial operation equipment that is much more concerned with system cost and energy saving than performance and comfort. Researchers at home and abroad have focused more on system configuration and energy saving characteristics [1]. The construction machinery hydraulic system control methods such as fixed displacement pump systems or multi-way valve hydraulic systems occupy a certain market with its cost advantage [2], due to the inevitable massive throttling and overflow losses, it does not meet the trend of energy saving and will eventually be eliminated. The cost of the load sensing system, positive flow system, and negative flow system is more than five times higher than that of a fixed displacement pump system. The complex system and high maintenance difficulty limit its application fields and application models
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