When designing hydraulic systems, you aim to get as much work done as possible while using less energy. You’ve got many design choices – from more traditional circuits to specialized arrangements like load sensing. High-end load sensing hydraulic systems offer better control and energy efficiency. Load sensing systems have become increasingly popular and widely accepted, introducing greater sophistication and simplicity in hydraulic controls.
The book on Load Sensing Hydraulic Systems by the Author is really helpful in understanding load sensing systems. It explains these systems’ important components, like load sensing variable-displacement pumps and pump displacement control elements. When the system demands flow, a load sensing variable-displacement pump with a swash plate design delivers only the flow required by the associated system at a pressure required to move the connected load. The displacement control elements, including pressure controllers and load sensing compensators, are used to efficiently control the swash plate angle. For easy understanding, the book provides simple examples that clearly illustrate different modes of operation for load sensing systems. The SI system of units is employed throughout the book.
A conventional hydraulic system with a fixed-displacement pump provides a constant flow through the system. When the system develops the set pressure, the pump flow is bypassed through the associated pressure relief valve. As a consequence, the system generates tremendous amount of heat. Even when a variable-displacement pump is employed, the system produces considerable heat. A sophisticated solution to improve the efficiency is to add a load sensing feature to the system.
The hydraulic system with a load sensing feature provides only the flow and the pressure as required by the connected load. Controlling both the pressure and the flow allows for a significant reduction in losses, improvement of circuit efficiencies, and enhancement of the service life of the system. The principle of load sensing is widely used in mobile hydraulic systems, including tractor systems, trucks, and cranes. It is also…
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