These devices look at the pressure drop across the DPF. The computer looks at these temperatures (in conjunction with the differential pressure sensor ) to infer the level of restriction in the system. The exhaust gas temp sensors should indicate the heat production created during proper diesel oxidation catalyst operation (DOC) and the diesel particulate filter (DPF) operation. On top of that, the computer also uses this information to control diesel exhaust fluid dosing (DEF) into the selective catalyst reduction (SCR) chamber. Intake and outlet NOx sensors give NOx information to the computer so it can adjust the timing of fuel injection, VGT rate, and how much EGR flow is needed to manage NOx output.

aftertreatment particulate matter sensor module.exhaust gas temp module (which holds the temp sensors for the diesel oxidation catalyst).On this aftertreatment system are mutiple modules that communicate with the Cummins Computer, these include: These systems are not as simple as one may think. Simple, right? Well, manufacturers have now put in place CAN sub-systems, adding a deeper layer of complexity.Īn overview of the CAN bus components For example, as the title implies, Cummins uses a separate CAN network for its exhaust aftertreatment system. Signals could be processed and outputs would be created accordingly. By this I mean each module for each system on the bus would communicate with each other. For quite some time we have had CAN bus communication systems on cars and trucks that carry information from module to module.

Cummins insite fuel percentage