Hydraulics play a pivotal role in excavator operation, allowing the operator to use simple levers to manipulate the cylinders that control the boom and bucket. And now, in the ever-evolving realm of heavy equipment technology, Volvo Construction Equipment has introduced an electro-hydraulic innovation known as Independent Metering Valve Technology (IMVT). This advancement aims to redefine the capabilities of excavators used in construction and general excavation applications. IMVT is currently available on Volvo’s latest 50-ton excavator models, providing improved control, efficiency, versatility, and operator experience.
The evolution of excavator technology
IMVT marks a departure from the traditional mechanically coupled hydraulic systems and introduces intelligent electronic control with numerous variables. The results are up to 25 percent improved fuel efficiency and enhanced operator controllability.
One key difference is the closed-centre valve control system, which can stop or minimize hydraulic flow going through the main control valve (MCV) when there is no demand for a hydraulic actuator. Other control systems have an open-centre valve control system so hydraulic flow goes through the MVC no matter what. This is one of reasons why IMVT lowers fuel consumption and eliminates the need for an ECO mode.
The second main differentiator is that IMVT senses and controls each side of the chamber of a cylinder without hydraulic spools and hydraulic pilot lines for more precise control.
IMVT also replaces traditional spools with poppet and electro-hydraulic valves in the MCV, reducing pressure losses and optimizing valve control based on load conditions. This leads to faster cycle times, improved regeneration, and reduced flow loss.
Finally, by eliminating hydraulic pilot lines, IMVT significantly reduces the risk of leaks and damage. The absence of spools and pilot lines simplifies maintenance and service, while integrated sensors enhance diagnostics through a dedicated service tool.
The power of IMVT in excavation
IMVT significantly enhances excavator performance, particularly in general excavation and truck-loading scenarios where maximum productivity is crucial. Resulting features include:
Creep mode: Ideal for utility and piping applications, creep mode separates the two main hydraulic pumps, ensuring a constant travelling speed regardless of other hydraulic actuator activations.
Motion priority functions: Operators can customize settings for boom-up, swing, and other functions, optimizing hydraulic priority based on the task and reducing loading cycle times, especially in close proximity to trucks.
Reduced bouncing: IMVT addresses operator fatigue caused by bouncing because it enhances the precision of the excavator’s movements, which is crucial when handling delicate or heavy loads in the bucket.
Improved Comfort Drive Control (CDC): CDC transforms the operator experience by enabling precise track control using only an index finger on roller proportional switches. This reduces fatigue and increases efficiency – especially in challenging terrains.
Auto warmup: In cold working environments, IMVT’s auto warmup feature efficiently warms up the hydraulic circuit without external heaters, ensuring quick readiness without burdening the hydraulic system.
Customizable control functions: IMVT offers a range of customizable functions, including boom up – swing priority; boom up – travel priority; and boom down speed control. These features empower operators to tailor the excavator’s performance to specific tasks, enhancing both efficiency and operator satisfaction.
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