Volvo Penta has introduced a new 8-litre diesel off-road industrial engine with an after-treatment system as the next model in its EU Stage V range. It becomes part of the spectrum of Stage V D5, D8, D11, D13 and D16 engines from Volvo, offering a total power range from 105 to 565 kW.

The new engine has a power output of up to 235 kW. The Stage V version of this engine, TAD880-883VE, is of compact design and has a perfectly matched exhaust after-treatment system, to meet new EU Stage V emissions regulations. It has been developed for the future needs of customers and offers what Volvo says is ‘world class fuel efficiency with maximised uptime via the optimised regeneration strategy’.

Stage V regulations for Europe will be implemented in 2019, requiring new emission limits for diesel and spark-ignited engines. The scope of the legislation is set to widen as engines below 19 kW and above 560 kW will be regulated for the first time. And while current Stage IV regulations limit the overall mass of particle emissions, Stage V will also constrain the number of particles emitted.

Design aspects

The D8 Stage V engine has been equipped with a fixed geometry turbo which contributes to reduced complexity. It has the excellent fuel economy that comes with its efficient common rail fuel injection, and achieves maximum power and torque at low revs, thereby operating at a low noise level.

The air inlet throttle, together with the uncooled exhaust gas recirculation (EGR), and the electrical exhaust pressure governor (EPG) deliver highly effective heat management of the engine. This enables the system to function without the need to inject fuel into the exhaust stream to raise the temperature.

With this approach, the exhaust gas has an optimal temperature when it passes through the exhaust after-treatment system (EATS). Low heat rejection from the complete system means that less cooling is required.

The EATS includes the following components: diesel oxidation catalyst (DOC), diesel particulate filter (DPF), diesel exhaust fluid (DEF)/AdBlue injection, selective catalytic reduction (SCR), and ammonia slip catalyst (ASC).

Regeneration strategy

The new engine and EATS are designed to work together to maximise passive regeneration during normal operation. With Volvo’s Stage V approach, there is no high-temperature regeneration due to the fact that sulphur regeneration in the SCR catalyst is not required; only soot regeneration is needed to clean the DPF. Neither is an additional fuel injector (7th injector) for sulphur regeneration needed. This leads to increased fuel efficiency and uptime for operators.

“With our EATS solution, there is no need for daily stand-still regeneration,” says says Johan Carlsson, chief technology officer for Volvo Penta. “Passive regeneration enables increased efficiency and maximises uptime for customers. This has been a major driver in our product development in order to provide a solution that helps maximise productivity for the end-users of our products in all the different applications where they operate.”