advanced exhaust after treatment system that reduces particulate matter by 90% compared to the previous machine series. The filter traps the particulates and temporarily holds them until there is a sufficient build up to merit 'regeneration'. This is effectively incinerating the particulates at temperatures above 700oC, turning them to ash using a thermal regenerator. The semi-automatic regeneration system used in the Volvo solution will help maximize the uptime of the machine. Unlike other systems, Volvo's regeneration solution can be carried out while the machine continues working, meaning no reduction in productivity.
Fuel type is also important, as new generation machines require ultra low sulphur fuels. Such fuel is not only required by the new Stage IIIB/Tier 4 regulations, it is critical for the emission control technology to work. Using other types of fuel can result in engine damage. Consequently, 'Ultra Low Sulphur Fuel Only' signs will be prominently placed near the fuel inlet. Using the correct engine oil is also important, as special Ultra Diesel Engine Oil VDS-4 is required, which reduces the build up of ash in the regenerator, increasing the time between ash cleaning.
Processing the process
With such sophistication, the new generation V-ACT electronic control unit (ECU) plays a fundamental role. The new EMS version boasts a more powerful processor with the capability to support more functions than its predecessor, at higher speeds and with more control. The ECU controls the entire EGR process, managing the mix of recirculated exhaust gas and fresh air that is so crucial to reducing NOx and PM emissions, while maintaining performance and economy.
Total solution provider
The impact of the EU Stage IIIB and US (EPA) Tier 4 interim legislation cannot be underestimated. There will be a need for additional operator and technician training in order to understand the principles of the new technology, but in terms of the benefit to the environment, it is worth the effort. Lower emissions, better performance, improved operational economy and higher quality are the hallmarks of the new V-ACT generation engine systems, and represent an engineering achievement of the highest calibre.
"If you have any questions on Volvo Construction Equipment's approach to Tier IV please do not hesitate to contact us."