Whereas battery autos typically seize the headlines, the interior combustion engine continues to be a significant a part of the vitality 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 cut back their carbon footprint, producers are growing progressive engine applied sciences that preserve energy and reliability whereas chopping emissions. From dual-fuel hydrogen options to full hydrogen combustion engines, these developments are accelerating the transition to zero-emissions in off-highway functions.
Volvo Penta and CMB are collaborating on a dual-fuel hydrogen resolution for each land and marine functions. This partnership builds on profitable pilot tasks relationship again to 2017, throughout which Volvo Penta engines had 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, delivered to low stress, and injected into the engine’s air consumption. This reduces the quantity of diesel required to supply the identical vitality output, decreasing CO2 emissions whereas sustaining efficiency. “The entire Volvo Group is working intensively to discover options to cut back, and in the end eradicate, greenhouse fuel emissions,” says Heléne Mellquist, president of Volvo Penta. “We’re teaming up with suppliers, companions, and clients to speed up the journey into fossil-free fuels for each on land and at sea functions.”
A bonus of the dual-fuel resolution is its fallback functionality. If hydrogen will not be out there, the applying can proceed operating on conventional gas. This makes it significantly appropriate as a transitional know-how whereas hydrogen infrastructure develops. “It is a resolution the place you utilize hydrogen and diesel together,” says Ann Parmar, VP advertising at Volvo Penta. “It’s not the complete hydrogen engine, the place you might want to 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 vitality transition is a significant problem in lots of sorts of functions. With the dual-fuel know-how we now have been growing over the previous few years, we are able to present a cheap and sturdy resolution for a wide range of functions.”
Full hydrogen combustion
Whereas Volvo Penta focuses on dual-fuel know-how, JCB is taking a unique method with its £100 million funding in totally hydrogen-powered combustion engines. After three years of growth by a workforce of 150 engineers, JCB not too long ago introduced the official certification for its engine for industrial use in 11 European international locations. “It’s a important second for JCB,” says JCB chairman Lord Bamford. “To begin 2025 with certification in place in so many European international locations bodes very properly for the way forward for hydrogen combustion know-how. JCB has proved in recent times that it’s a correct zero emissions resolution for a variety of building 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 show 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 accredited and endorsed by governments. That is really exceptional, however it’s only the start,” says JCB’s group director for particular tasks, Tim Burnhope.
Pathways to sustainability
Liebherr is pursuing a number of avenues for decreasing emissions in off-highway functions together with an expanded diesel engine portfolio, superior hydrogen engine growth, 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 functions, significantly specializing in agricultural equipment. The corporate additionally showcased progressive 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 stress, which ends up in vitality loss. Our innovation doesn’t solely enable to get better and retailer this vitality, but additionally 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 shortly,.
Liebherr’s parts product section has additionally invested considerably in hydrogen engine growth and testing amenities. Since 2020, prototype engines have undergone rigorous testing, and the corporate is presently evaluating completely 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 decreased 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 growth
Caterpillar Industrial Energy Methods is advancing its electrification technique with the introduction of its Sequence Hybrid Energy Growth powertrain, combining diesel-electric and battery know-how to optimise energy effectivity and cut back emissions.
Additionally launched at Bauma, the brand new powertrain operates via an built-in system the place a Cat engine drives a generator to transform mechanical vitality 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 vitality for peak energy calls for, enhancing system effectivity.
“This is a perfect resolution to fulfill the present wants of a lot of our clients,” says Steve Ferguson, senior vp of Caterpillar Industrial Energy Methods. “Combining the engine and battery supplies increased 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 decreased downtime, improved gas effectivity, and lowered restore frequency, minimising the entire price of possession.”
The hybrid powertrain system consists of 5 key parts working in concord. The engine serves as the first energy supply, offering mechanical energy to the generator. This technique is designed to be suitable with engines throughout the Caterpillar vary, together with future developments operating on various 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 vitality from the generator or battery and distributes it to the motors. It could additionally settle for recuperated vitality from the motors to recharge the battery. The motor converts electrical output from the inverter into the required torque and velocity. Moreover, the motors are able to absorbing mechanical vitality and rework it into electrical output for braking and regeneration.
Finishing the system is the battery, which shops extra vitality from the engine or regenerative vitality from the motors, offering fast energy response to fulfill essential cycle necessities. It could complement engine energy or act as the only real energy supply when wanted.
The hybrid functionality permits for zero-exhaust emissions when operating on battery energy. Moreover, with applicable gear, the Sequence Hybrid Energy Growth 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 workforce of engineers is testing varied various fuels, together with hydrogen, methane, methanol and ethanol. “We’re doing this work now. This implies when our clients are prepared to maneuver to hydrogen or different fuels, we will 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 growth progress via a simulated take a look at cell setting 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 various fuels within the evolving vitality panorama. We’re utilizing what we’ve realized from this know-how for our different engines in growth,” says Bennett.
A greener future
It’s clear that whether or not via enhancing the effectivity of diesel combustion, implementing various 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 completely different approaches will be taken to reaching the identical objective: decreasing emissions whereas sustaining efficiency and reliability. What unites them is the popularity that the business 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 business.”
This text first appeared within the June problem of iVT
