Whereas battery autos typically seize the headlines, the interior combustion engine remains to be a significant a part of the power transition within the off-highway sector, with environment friendly diesel, dual-fuel, hydrogen combustion and hybrid options being developed
As the development and mining industries search to scale back their carbon footprint, producers are growing revolutionary engine applied sciences that preserve energy and reliability whereas slicing emissions. From dual-fuel hydrogen options to full hydrogen combustion engines, these developments are accelerating the transition to zero-emissions in off-highway purposes.
Volvo Penta and CMB are collaborating on a dual-fuel hydrogen answer for each land and marine purposes. This partnership builds on profitable pilot tasks courting again to 2017, throughout which Volvo Penta engines have been tailored to run on each hydrogen and diesel utilizing CMB know-how.
The brand new collaboration leverages Volvo Penta’s established Stage V D8 engine platform, enhanced with CMB’s hydrogen injection system. Hydrogen is launched from storage tanks, dropped at low strain, and injected into the engine’s air consumption. This reduces the quantity of diesel required to supply the identical power output, lowering CO2 emissions whereas sustaining efficiency. “The entire Volvo Group is working intensively to discover options to scale back, and finally eradicate, greenhouse fuel emissions,” says Heléne Mellquist, president of Volvo Penta. “We’re teaming up with suppliers, companions, and prospects to speed up the journey into fossil-free fuels for each on land and at sea purposes.”
A bonus of the dual-fuel answer is its fallback functionality. If hydrogen will not be obtainable, the appliance can proceed operating on conventional gas. This makes it significantly appropriate as a transitional know-how whereas hydrogen infrastructure develops. “It is a answer the place you utilize hydrogen and diesel together,” says Ann Parmar, VP advertising and marketing at Volvo Penta. “It’s not the total hydrogen engine, the place you could construct it from scratch.”
“From the preliminary dual-fuel know-how tasks we now have seen reductions of CO2 emissions as much as 80%” says Roy Campe, CTO of CMB. “It’s clear that the power transition is a serious problem in lots of kinds of purposes. With the dual-fuel know-how we now have been growing over the previous few years, we are able to present an economical and sturdy answer for a wide range of purposes.”
Full hydrogen combustion
Whereas Volvo Penta focuses on dual-fuel know-how, JCB is taking a distinct method with its £100 million funding in absolutely hydrogen-powered combustion engines. After three years of improvement by a group of 150 engineers, JCB lately introduced the official certification for its engine for industrial use in 11 European nations. “It’s a vital second for JCB,” says JCB chairman Lord Bamford. “To start out 2025 with certification in place in so many European nations bodes very effectively for the way forward for hydrogen combustion know-how. JCB has proved in recent times that it’s a correct zero emissions answer for a variety of development and agricultural autos.”
JCB has already produced over 130 analysis engines powering backhoe loaders, Loadall telescopic handlers and generator units. Furthermore, 2024 noticed over 50,000 hours of hydrogen engine testing. JCB additionally accomplished greater than 25,000 km of on-road testing on the request of the UK Authorities to display that hydrogen-powered machines are secure to be used on British roads.
“5 years in the past, hydrogen combustion engine know-how was not even on the radar, and now it’s being authorized and endorsed by governments. That is actually exceptional, however it is just the start,” says JCB’s group director for particular tasks, Tim Burnhope.
Pathways to sustainability
Liebherr is pursuing a number of avenues for lowering emissions in off-highway purposes together with an expanded diesel engine portfolio, superior hydrogen engine improvement, and analysis into ammonia instead gas.
At Bauma 2025, Liebherr unveiled its new D9612 diesel engine, delivering a most energy output of 950kW for demanding off-road purposes, significantly specializing in agricultural equipment. The corporate additionally showcased revolutionary know-how like its hydraulic air boosting system which improves engine dynamics and effectivity. “In our machines, we transmit energy utilizing pressurised hydraulic fluid,” says Bouzid Seba, head of pre-development at Liebherr Machines Bulle. “Sure actions require the discharge of strain, which ends up in power loss. Our innovation doesn’t solely enable to get well and retailer this power, but in addition to make use of it subsequently on demand in our hydraulic air booster. When wanted, the air booster pushes giant portions of air into the motor to assist it ship energy rapidly,.
Liebherr’s elements product phase has additionally invested considerably in hydrogen engine improvement and testing amenities. Since 2020, prototype engines have undergone rigorous testing, and the corporate is at present evaluating totally different injection and combustion applied sciences. This contains port gas injection (PFI) and direct injection (DI).
To future-proof its portfolio additional, Liebherr showcased an idea ammonia engine at Bauma 2025. Inexperienced ammonia serves as a hydrogen service, providing lowered transportation and storage prices. The corporate means that turbines and off-highway powertrains fuelled by inexperienced ammonia may present low- or zero-emission options, significantly for mining.
Hybrid energy enlargement
Caterpillar Industrial Energy Programs is advancing its electrification technique with the introduction of its Sequence Hybrid Energy Enlargement powertrain, combining diesel-electric and battery know-how to optimise energy effectivity and scale back emissions.
Additionally launched at Bauma, the brand new powertrain operates by an built-in system the place a Cat engine drives a generator to transform mechanical power into electrical energy. An inverter then manages energy distribution from each the generator and battery to the electrical motors that drive the machine. This setup permits the battery to retailer unused power for peak energy calls for, enhancing system effectivity.
“This is a perfect answer to fulfill the present wants of lots of our prospects,” says Steve Ferguson, senior vp of Caterpillar Industrial Energy Programs. “Combining the engine and battery offers greater energy functionality than utilizing both an engine or battery alone. This enables for management optimisation to distribute energy from a number of sources, maximising powertrain effectivity. Clients profit significantly from lowered downtime, improved gas effectivity, and lowered restore frequency, minimising the full price of possession.”
The hybrid powertrain system consists of 5 key elements working in concord. The engine serves as the first energy supply, offering mechanical energy to the generator. This technique is designed to be appropriate with engines throughout the Caterpillar vary, together with future developments operating on different fuels. The generator is intently coupled to the engine and chosen to align with engine capabilities to supply electrical energy.
On the coronary heart of the system is the inverter, the central element that manages power from the generator or battery and distributes it to the motors. It could actually additionally settle for recuperated power from the motors to recharge the battery. The motor converts electrical output from the inverter into the required torque and pace. Moreover, the motors are able to absorbing mechanical power and rework it into electrical output for braking and regeneration.
Finishing the system is the battery, which shops extra power from the engine or regenerative power from the motors, offering speedy energy response to fulfill important cycle necessities. It could actually complement engine energy or act as the only energy supply when wanted.
The hybrid functionality permits for zero-exhaust emissions when operating on battery energy. Moreover, with acceptable gear, the Sequence Hybrid Energy Enlargement powertrain can perform as a cellular energy supply with export functionality.
Past hybrid know-how, Caterpillar is actively growing hydrogen options for its engines. A group of engineers is testing varied different fuels, together with hydrogen, methane, methanol and ethanol. “We’re doing this work now. This implies when our prospects are prepared to maneuver to hydrogen or different fuels, we can present them with our deep experience and studying to make sure a clean adoption,” says Luke Bennett, Caterpillar product specialist.
At Bauma, Caterpillar demonstrated its hydrogen improvement progress by a simulated check cell surroundings for the C18, a fuel engine transformed to run on hydrogen.
“We’ve been working it on high and low ambient temperatures and looking out on the vibration results of the engine, which is how we examine different fuels within the evolving power panorama. We’re utilizing what we’ve realized from this know-how for our different engines in improvement,” says Bennett.
A greener future
It’s clear that whether or not by enhancing the effectivity of diesel combustion, implementing different gas options or combining electrical energy in hybrid powertrains, the interior combustion engine nonetheless has a vital function to play within the drive to decarbonise off-highway.
The event of those applied sciences highlights how totally different approaches will be taken to attaining the identical objective: lowering emissions whereas sustaining efficiency and reliability. What unites them is the popularity that the trade wants sensible, dependable options that may be carried out within the real-world, as Burnhope highlights: “It’s not nearly what’s written on paper; it’s about actual machines engaged on actual job websites, making an actual distinction to the trade.”
This text first appeared within the June subject of iVT
