What does it mean when the carbon loading value of JMC's DPF increases?
4 Answers
The installation of a Diesel Particulate Filter (DPF) is a crucial measure for vehicle diesel engines to comply with emission regulations. The key challenges in the industrialization and practical application of DPFs are to prevent carbon particle clogging under various operating conditions of the diesel engine and to safely and effectively complete the regeneration process. Below is more related information: Methods for calculating carbon loading: 1. A method for calculating the carbon loading of a diesel engine DPF based on pressure drop involves estimating the internal carbon loading using parameters such as the exhaust temperature before and after the DPF. The carbon loading value based on back pressure is calculated through the DPF back pressure model. Among various DPF regeneration technologies, except for continuous regeneration, it is necessary to determine the timing for regeneration. Essentially, determining the regeneration timing involves assessing whether the carbon loading in the particulate filter meets the requirements for regeneration. 2. The most direct method to determine the carbon loading of a DPF is to weigh the DPF when it is unloaded and after loading. However, during the actual operation of the vehicle, it is impractical to frequently dismantle the DPF, making this method unfeasible. Currently, mainstream regeneration control strategies use carbon loading as the direct control parameter to trigger active DPF regeneration. However, during the actual operation of the diesel engine, accurately estimating the carbon loading of the DPF using real-time detectable parameters (such as engine speed, load, exhaust temperature, and DPF pressure drop) and precisely controlling the start and stop of regeneration remain areas for further research.
Recently, my Jiangling vehicle has also experienced an increase in DPF soot loading, simply put, there's more carbon buildup in the particulate filter in the exhaust pipe. Diesel vehicle owners know that the DPF acts like a filter for exhaust gases, specifically capturing carbon particles from black smoke. A rising value indicates excessive carbon buildup, at which point the system should automatically trigger a regeneration process to burn off this carbon at high temperatures. But if you frequently drive short distances where exhaust temperatures don't get high enough, or if the regeneration function fails to initiate successfully, the numbers will keep climbing. From my experience, driving on the highway for about half an hour, keeping the RPM steady around 2,500, can raise the exhaust temperature enough to initiate active regeneration. If that doesn't work, you'll have to visit a 4S shop for a forced regeneration. Never ignore it, or the DPF could get completely clogged, requiring a full replacement that would cost several thousand yuan.
When repairing Jiangling vehicles, the issue of increased DPF carbon loading is frequently encountered, which essentially means excessive soot accumulation in the particulate filter. Diesel vehicles produce carbon particles when combustion is incomplete, and the DPF is specifically designed to collect these particles. Normally, the values increase after driving for a while, but they should automatically burn off once they reach the set threshold. Abnormal increases in values usually indicate one of three situations: either the sensor is giving false readings, the regeneration system is malfunctioning, or the vehicle has been driven at low speeds for extended periods, resulting in insufficient exhaust temperatures. Addressing this isn't difficult—first, check the fault codes to rule out sensor issues, then drive at high speeds to trigger regeneration. If the regeneration indicator on the dashboard lights up and no action is taken, the filter may become permanently clogged. I recommend driving at high speeds at least once a month as a preventive measure, which is more effective than repairing after the fact.
An increase in the Jiangling DPF soot loading value indicates that the carbon soot accumulation in the particulate filter has exceeded the standard. The DPF acts like an exhaust gas mask for diesel vehicles, specifically designed to capture carbon particles emitted by the engine. There are two types of value increases: normal accumulation occurs after driving a few hundred kilometers and is resolved through regeneration; abnormal spikes require attention. A common cause is regeneration failure, such as prolonged low-speed city driving where the exhaust temperature is insufficient to burn off the soot. I once encountered this situation—driving to the suburbs and maintaining high RPMs for half an hour gradually reduced the value. Poor fuel quality or a faulty mass airflow sensor can also cause false increases. Daily prevention is simple: avoid prolonged idling and occasionally drive at highway speeds.
