Volvo Construction Equipment has adopted a combination of “in-cylinder” and “external” solutions to meet Stage IIIB and Tier 4 interim regulations for its new generation of V-Act engine systems that feature ultra-high-pressure variable fuel-injection systems, cooled-exhaust gas recirculation, precise control of the turbochargers and an integrated exhaust after-treatment system featuring a particulate filter and thermal regenerator. Volvo’s regeneration solution can be carried out while the machine continues working. The electronic control unit controls the entire EGR process.