Active regeneration Many cars don't get the right sort of use for passive regeneration to work so car manufacturers build in ‘active’ regeneration where the engine control software senses that the filter’s getting blocked and injects extra fuel into the engine to raise the exhaust temperature and trigger regeneration. The ash can’t be removed – unless the DPF is removed from the vehicle and – but a DPF in a car used correctly should be good for well over 100,000 miles. ![]() The collected soot is burnt off, leaving only a tiny ash residue. This is usually done passively in a process called 'regeneration': when the exhaust temperature’s high enough, on motorways or fast A-roads. ![]() To maintain performance a DPF has to be emptied regularly. E A Cinta tak mungkin berhenti B E Secepat saat aku jatuh hati A D Jatuhkan hatiku kepadamu G E B E Sehingga hidupku pun berarti E A Cinta tak mudah berganti F Bm Tak mudah berganti jadi benci G Fm Walau kini aku harus pergi A E Tuk sembuhkan hati D Gm Em Hanya kamu yang bisa D C Am Bisa membuatku rela, Bm B Rela menangis karnamu B A Cinta. The aim is an 80% cut in particle emissions but the technology's not without problems and our patrols are often called to cars with a blocked DPF. Modern diesel cars (since 2009) have to be fitted with a Diesel Particulate Filter (DPF) in the exhaust to stop this soot passing into the atmosphere.
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