The evolving role of hydraulics in automation
Aaron Blutstein 10 October 2025 
Hydraulics continue to play a vital role in automation, delivering the force and precision required for robotics. As systems become more digital and connected, engineers are integrating smart, sensor-driven hydraulics with advanced control technologies to improve efficiency, reliability, and responsiveness across automated manufacturing environments. Smart Machines & Factories reports.
Hydraulic systems have been part of automated manufacturing for as long as automation itself. But as robotics and digital control continue to reshape production lines, engineers are rethinking how hydraulics fit into systems that now depend as much on data and software as they do on pressure and flow.
In many applications, hydraulics remain the best option when serious force is needed in a compact footprint. Electric actuators can’t always match that power density, especially in heavy forming, pressing, or moulding work. The focus today isn’t on replacing hydraulics with something new, but on making them work more intelligently alongside robotic control systems and automation software.
As automation systems evolve, the challenge isn’t replacing hydraulics but modernising them. Engineers and system designers are now exploring how hydraulics can integrate seamlessly with robotics and control technologies to deliver the best of both worlds — force and finesse.
Smarter hydraulics for smarter automation
The rise of robotics and Industry 4.0 has shifted expectations around how every part of a system should communicate and adapt. Traditional hydraulic systems, once largely mechanical and manual, are now being equipped with sensors, digital controllers, and advanced feedback mechanisms. The result is a new generation of “smart hydraulics” capable of matching the responsiveness of electric drives while retaining their superior power density.
Modern electro-hydraulic actuators can be controlled with remarkable precision through proportional and servo valves, allowing for fine motion control that was once considered the preserve of electric systems. When linked to programmable logic controllers (PLCs) or industrial PCs, these systems can operate as part of wider automation networks, continuously feeding back data on position, pressure, temperature, and flow. That information can then be analysed to improve performance, predict wear, and schedule maintenance before downtime occurs.
This data-driven approach has been a game changer for industries that depend on hydraulic motion. For example, in metal forming or pressing operations, predictive control now allows a press to adjust its force dynamically during each stroke, improving accuracy and reducing material waste. In automated handling or robotics applications, closed-loop hydraulic control can deliver smooth, repeatable motion even under heavy loads – something electric drives can struggle to match without substantial cost or bulk.
Efficiency and energy recovery
Another key area of development lies in energy efficiency. Historically, hydraulic systems have been criticised for their energy use — particularly in systems that rely on constant-speed pumps. However, the introduction of variable-speed drives, efficient pump control, and energy recovery circuits has transformed the picture.
By matching pump speed to system demand, energy can be saved during idle periods without compromising performance. In some advanced systems, regenerative braking or accumulator-based recovery allows energy from deceleration to be stored and reused within the same cycle. This not only reduces energy costs but also helps manufacturers meet tightening sustainability targets.
In integrated robotic environments, where multiple actuators operate in sequence, these improvements can be significant. Coordinating energy flow between actuators and controllers helps balance system load and smooth power demand across the production line. It’s an approach that mirrors the energy efficiency strategies already used in electric drives, bringing hydraulics in line with wider automation goals.
Seamless integration and control
A key challenge for engineers integrating hydraulics into robotic or automated systems has always been control. Early hydraulic systems often required separate control hardware and bespoke wiring. Today, however, integration is much simpler.
Thanks to advances in electro-hydraulic modules and open communication standards such as EtherCAT and IO-Link, hydraulic components can now “speak the same language” as other automation devices. A proportional valve or digital pump controller can be connected directly to a machine’s central PLC, with real-time data exchanged across the same industrial network that handles robotic motion or quality control sensors.
This interoperability has opened new design possibilities. For example, compact self-contained hydraulic actuators can now be deployed as plug-and-play units, complete with integrated sensors, controllers, and communication ports. They can be mounted directly on robotic frames or mobile machinery without the need for a central hydraulic power unit or extensive pipework. This modularity makes it easier to incorporate hydraulic motion where high forces are needed without compromising system flexibility or ease of installation.
Maintenance and skills
As systems become more integrated, the skills needed to maintain them are changing. Where once a hydraulic engineer might have focused primarily on fluid dynamics and mechanical service, today’s technicians need to understand software parameters, network communication, and diagnostic interfaces.
This shift has prompted a wave of new training initiatives and collaboration between manufacturers, automation specialists, and training providers. Service tools are also evolving. Portable diagnostic devices and mobile apps now allow maintenance teams to visualise hydraulic performance in real time, compare it to baseline data, and identify issues before they escalate.
The move towards predictive maintenance — supported by embedded sensors and cloud-based monitoring — has also reduced the need for reactive repairs. Instead of waiting for pressure drops or leaks to signal a problem, systems can automatically flag when filters need replacing or when pump efficiency begins to fall. For manufacturers operating round-the-clock automation lines, that can make the difference between planned downtime and an expensive production halt.
Balancing hydraulics and electrics
One of the most interesting developments in recent years has been the shift towards hybrid actuation — systems that combine hydraulic and electric technologies to deliver the most appropriate performance for each task. In a robotic press, for instance, hydraulics might handle the high-force stage of a cycle, while electric drives manage positioning and light-load movements. This hybrid approach delivers efficiency, control, and compactness, while ensuring the system remains cost-effective and durable.
Hydraulic manufacturers are responding by developing electro-hydraulic servo drives that provide the control and feedback of electric systems with the muscle of hydraulics. These drives are increasingly used in mobile robotics, automated construction machinery, and even collaborative robots for heavy-duty industrial use. The end goal isn’t to replace one technology with another but to design systems that exploit each technology’s strengths in harmony.
A practical path forward
The evolution of hydraulics within automation isn’t about revolution but adaptation. The underlying principles of fluid power remain the same, but the way they are controlled, monitored, and maintained continues to advance. The focus for most manufacturers now is integration — ensuring that hydraulic systems operate as part of an intelligent, interconnected network rather than as isolated components.
The path forward is pragmatic. It’s about understanding where hydraulics add unique value and then using modern control technologies to unlock that potential. With the right mix of digital integration, training, and system design, hydraulics can continue to underpin automation with the reliability and power they’ve always offered — now enhanced by precision, efficiency, and connectivity.
As robotics become more capable and automation more widespread, the demand for hydraulic systems that can work in harmony with digital control will only grow. Those companies that bridge the gap between traditional engineering and modern automation will be best placed to deliver the adaptable, efficient, and data-driven systems that industry increasingly depends on.
