2 Exhaust gas return Engine description 1 Additional cams for exhaust gas recirculation TD/TCD 2012/2013L04 Inlet valve opens briefly during the outlet cycle and emits an exhaust gas partial flow to the suc- tion system. This partial volume is sucked back in in the next suction cycle. TCD 2012/2013L06 The outlet valve opens briefly in the intake stroke. 2 Outlet valve 3 Inlet valve 21 Internal exhaust gas recirculation 2 3 1 1 [°] [mm] 3 2