SCANIA’S SUPER POWER

MAKING A SUPER ENGINE

Scania’s R&D team on being the beating heart of the Swedish truck and busmaker’s new powertrain and beyond

For the past five years, Scania’s super-dedicated R&D teams have turned over every stone to develop the most energy-efficient and sustainable combustion engine platform the heavy transport industry has ever seen. Here’s how they came up with the super-efficient Scania Super.

How do you improve an engine platform that has won the European Green truck award five years in a row? How do you develop a powertrain that will strengthen Scania’s industry-leading position within sustainable transport for the rest of this decade? How do you secure wins in future fuel consumption tests, an area in which Scania has a proud record that it doesn’t want to lose?

The developers at Scania Technical Centre who were given these assignments say the answers are: determination, innovation and customer focus.

Completely new platform

“We had the privilege to start with a blank slate and develop a completely new 13-litre engine platform,” says Assistant chief engineer Linda Pukk Berggren.

“Starting from scratch meant we could concentrate all our design work with the customers’ needs in focus, without restraints. That’s why we can now present a product that the transport industry really needs here and now to take the necessary steps towards a sustainable future,” she adds.

With the Super engine platform, Scania’s engineers struck the perfect (and delicate) balance between a high-performing engine and an aftertreatment system that is as efficient as possible in limiting emissions but at the same time is “non-intrusive” for the engine and lets it fulfil its potential.

“We reach up to 50% in brake thermal efficiency. This is quite remarkable and means that a whole new level of energy is going directly to the wheels. What is also important is that fuel consumption is significantly reduced for a very broad part of the engine speed and load area. This means that many different applications, such as long-haul, construction and forestry vehicles, will all benefit from the improvements and emit less CO2,” says Magnus Nilsson, technical mnager within Aftertreatment.

Thanks to this outstanding energy efficiency and other major updates in Scania’s powertrain – such as a new gearbox and a new range of driven rear axles – fuel system, which has been proven to offer excellent fuel saving capacity and increased productivity and uptime, has been remade from the ground up. The system has earned a name of its own: Scania Twin SCR.

“Our new Twin SCR aftertreatment system is an inventive ‘chemical factory’ designed to utilise the limited heat that exits the efficient engine. It is capable of dramatically reducing emissions of nitrogen oxides and particulates. The concept is also future-proof for stricter environmental legislation in the years ahead,” says Nilsson.

A BLANK SLATE

The engine teams at the Scania Technical Centre had a completely clean slate when they started development of the 1.3 engine platform..

savings of eight% or more can be reached for long-haulage operations. And that’s in comparison with Scania’s already industry-leading performance levels. Efficient just became super-efficient.

So, what’s ‘under the hood’ of the new 13-litre engine? Quite a lot, in fact.

New features include dual over-head camshafts, optimised injectors, improved combustion, an optimised high-pressure fuel pump, improved cooling and lubrication, increased turbocharger efficiency, and a state-of-the-art engine management system.

Not only that; Scania’s successful dual dosing Selective Catalytic Reduction

We had the privilege to start with a blank slate”

Dual over-head

Both Nilsson and Pukk Berggren say they have vivid memories of the five-year long development process. And, at more than two billion euros, it is one of Scania’s largestever investments in a new powertrain.

In 2019, Nilsson says the developer teams were quite puzzled when testing trucks with the new engine platform in the heat and high altitude of the Sierra Nevada mountains in southern Spain. The data indicated a significant reduction in fuel consumption of approximately 10% in some tests – compared to the current award-winning Scania product that will be replaced by the new platform.

“We were fault-checking the test equipment because we questioned the readings, especially as the exhaust flow was comparatively low. Exhaust flow is an important parameter for designing the aftertreatment system and for the catalyst

A TRUCK-LOAD OF NEW FEATURES

New features include dual over-head camshafts, optimised injectors, improved combustion, an optimised high-pressure fuel pump, improved cooling and lubrication, increased turbocharger efficiency, and a state-of-the-art engine management system.