ALS - Adaptive Load Sensing System
The Adaptive Load Sensing system is able to modulate stand-by pressure according to the real working needs of a machine, automatically varying it only when and how required.
How the ALS system works
Hydraulic systems are an essential part of the most modern and widespread agricultural machinery, especially telehandlers, which have now become irreplaceable for most companies.
In order to ensure the simultaneous control of movements in these systems, the hydraulic pump generates a pressure higher than what is really necessary, a predetermined value called "stand-by pressure differential" which has been considered acceptable until now, but which implies a considerable loss of energy, limiting the overall performance of the vehicle and unnecessarily increasing wear and consumption, to the detriment of efficiency and environmental impact.
To give a solution to this problem, Walvoil has created Adaptive Load Sensing, a patent-pending system able to modulate the stand-by pressure value according to the real working needs of the machine, automatically varying it only when and how required.
In partnership with Dieci, the ALS system has been successfully tested on an AGRIPLUS telehandler, one of the top machines in the Dieci range for Agriculture.
ALS is made of a directional control valve, an electronic joystick, and an electronic control unit, with customizable modular software developed by Walvoil. The control unit collects information from the operations on the controls and from the machine sensors, and acts on the load sensing device, adapting the hydraulic pressure differential to the maximum efficiency value required by the vehicle.
The differential pressure value can also be selected by means of two push buttons on the joystick, the "precision function", which increases the movement controllability and precision, and the "boost function", which increases the pressure value for a higher movement speed without need to install pumps with higher flow rates.
During the tests, the Walvoil-Dieci Technical Team found on the AGRIPLUS a drop in energy dispersion values equal to 28% during boom operations, and up to 45% during traveling phases, with a significant improvement in the overall machine performance at various speeds.
The tests highlighted also further important advantages, first of all in terms of safety: by acting directly on the hydraulic signal, the ALS avoids the functional complexity associated with the digital signal. Furthermore, in case of failures, the original operation is automatically restored, avoiding machine downtime. Then in terms of stability: the control of the pressure value allows to improve the machine stability, with a consequent more comfortable use.
And finally, in terms of modernization: the few elements of the ALS kit can be easily installed even on older telehandlers, extending their operational life and improving their performance.
The development of the ALS system takes advantage of the collaboration of TASC, "Smart and Clean Agricultural Tractors Project", a project including the participation of the main university research laboratories of the Emilia Romagna Region - Italy, created with the aim of minimizing the environmental impact of agricultural mechanization.
More energy efficiency, more productivity, greater control, high customization possibilities, higher safety and stability and the possibility of modernizing older machines represent all the advantages obtainable from the ALS system and the confirmation of the achievements through the collaboration of two Emilian and world excellences, now also recognized by the prestigious awards by EIMA 2020-21.
