Optimizing Diesel Emission Controls through Advanced Software Solutions for HC Desorb Fault in Diesel Oxidation Catalysts

After the implementation of BS-VI emission standards, effective exhaust after-treatment has become critical in minimizing harmful emissions from diesel engines. One significant challenge is the accumulation of hydrocarbons (HC) in the Diesel Oxidation Catalyst (DOC). Certain hydrocarbons may adsorb onto the catalyst surface yet remain unreactive, leading to potential operational inefficiencies. This phenomenon necessitates the desorption of unreactive hydrocarbons to allow space for more reactive species, thereby enhancing oxidation efficiency and overall catalyst performance. The process of desorption (DeSorb) is vital to maintaining the balance of reactive hydrocarbons within the DOC. When a vehicle is idling, unburnt fuel produces hydrocarbons that accumulate in the DOC. Upon acceleration, these hydrocarbons can lead to an uncontrolled rise in temperature, resulting in DOC push-out, catalyst damage, and downstream impacts on the Diesel Particulate Filter (DPF). To mitigate these risks, a dedicated software solution has been implemented to monitor HC levels and trigger a HC desorb mode. This proactive approach initiates regeneration before hardware failure occurs, ensuring the longevity of the DOC and maintaining compliance with emission regulations. This innovative approach not only addresses immediate operational concerns but also contributes to the broader goal of sustainable automotive engineering.