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The variable frequency hydraulic system is characterised by high efficiency, high reliability and low cost, but has a critical disadvantage, poor low speed stability due to the limit of the minimum stable speed of pumps and low frequency of inverters. Aiming to improve the low-speed performance, a variable frequency hydraulic system in parallel valve control is proposed, in which a proportional throttle...
To improve low-speed stability and dynamic response of traditional variable speed pump control systems, this study proposes a variable speed pump control system in valve-pump parallel variable structure control, where a proportional flow valve is parallel to a variable speed pump and could work at leaking status and replenishing status, and then establishes its mathematical model and then analyses...
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