is representative of another type of dpf or csf having an additional ceo 2 catalyst that makes it less dependent on no 2 for oxidizing trapped particulate it has a single substrate 50 that combines an oxidation catalyst with a trap thereby eliminating the need for a separate upstream oxidation catalyst as in the dpf 42 shown in fig2 as exhaust gases are passing through substrate 50 dpm is being trapped and the oxidation catalyst is oxidizing hydrocarbons hc and converting no to no 2 with the no 2 being used to oxidize the trapped carbon control of regeneration of the illustrated dpf 42 is implemented through the engine controller in part responsive to data received over a controller area network can 101 from diverse controllers attached to a system bus 18 forming the backbone of the can 101 referring to fig4 it may be seen that engine controller 22 is coupled to receive from a series of sensors data relating to variables required for initiating and controlling filter regeneration the sensors provide throttle position 120 dpf temperature 121 which may be exhaust temperature dpf inlet pressure related to soot loading 122 exhaust mass flow 123 engine speed tachometer 125 typically a cam shaft rotational position sensor which is required for determining injection timing and soot load information 126.