Volvo Trucks North America announced that it will no longer require active diesel particulate filter (DPF) regenerations on its 2010 engines with selective catalytic reduction (SCR).
In extensive field testing, engineers have noted highway trucks with Volvo’s 2010 engines and SCR have been able to regenerate passively 100% of the time. That’s significant, because active regenerations require a dose of diesel fuel. Ed Saxman, drivetrain product manager with Volvo Trucks North America, said the ability to regenerate the DPF passively each and every time is another compelling reason to embrace SCR in 2010.
In vocational applications, Volvo is touting “near zero” active re-gens. It will continue collecting data before declaring it has completely eliminated active regenerations on vocational trucks.
“This is a huge development for our customers, since their drivers no longer have to monitor DPF status or worry about managing DPF regenerations -because a Volvo on-highway truck with SCR will not require active regeneration,” said Scott Kress, senior vice-president of sales and marketing. “Volvo’s advanced SCR technology removes a significant source of the trucking industry’s concerns with emission systems. The truck and driver are more productive, the fleet saves fuel and the environment benefits.”
Volvo is the first truck maker to lay claim to completely eliminating active DPF regenerations. It felt confident in doing so after collecting millions of miles of real-world testing data without a single active regeneration.
Saxman explained that NOx plays a vital role in facilitating passive DPF regenerations. Since Volvo is eliminating NOx downstream in the SCR catalyst, it can allow the optimum amount of NOx to leave the engine cylinder, improving DPF regeneration efficiency. Passive regenerations occur at about 500oF, according to Saxman, while active regenerations occur at significantly higher temperatures and require a burst of fuel.
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