Driving Forward

Coach and Bus Week’s Industry Guide to Engines and Transmissions features the advantages of Envirox™ DPF Assist:

Envirox DPF Assist in Use

Since the World Health Organisation last year confirmed diesel exhaust fumes as carcinogenic, the spotlight has once more fallen on measures to reduce the emissions from diesel engines. Requirements such as the London Low Emission Zone have already led to many vehicles being retrofitted with Diesel Particulate Filters (DPFs). The Euro VI emissions limit is expected to make almost all new buses and coaches factory fitted with a soot filter.

  In June this year, the government set up a new £5 million fund to reduce pollution from buses outside of London through methods such as retrofitting vehicles with DPFs. Local Transport Minister Norman Baker announced, ‘Improving air quality is important for the coalition government. This £5 million scheme will help clean up emissions from older buses in some of our most polluted urban areas.’

  To keep the exhaust clean of particulates (soot), however, the DPF itself needs to be kept clean. But the filter will rapidly block up unless a process called regeneration occurs to clear out the soot that it is designed to trap. Soot or carbon particles will burn completely away – like charcoal on a BBQ – provided they reach a temperature of around 600°C, and DPFs rely upon exhaust gas temperatures becoming hot enough for this to happen. Vehicles regularly run at high speed and carrying significant loads produce enough heat in their exhaust gases to achieve this but this is not always the case. 

Read more: Industry Guide – Engines and Transmissions – Driving Forward