Why do DPF differential pressure sensors fail?Īs with any electrical sensor in an engine, wires to the ECU can be damaged from harsh vibrations or crack and melt from extreme heat. By measuring and comparing the difference in pressure of the exhaust gas before and after the filter, the sensor can estimate the amount of DPM that is trapped in the filter and signal the PCM to start the DPF regeneration process. One hose connects before (upstream) the DPF, the other connects after (downstream) the filter. The sensor is connected to the engine control unit (ECU) by an electrical connector and connected to the DPF via two silicon hoses. The DPF differential pressure sensor is usually mounted in the engine compartment to protect it from heat.
How does a DPF differential pressure sensor work? For some vehicles, PCM relies on data from the DPF differential pressure sensor to initiate the DPF regeneration process. The injected fuel will raise the temperature of the DPF to 600 ☌ (or 1112☏) so the obstructing soot can burn off by converting it into ash.
To keep the filter from clogging, the engine initiates a regeneration process by injecting fuel into the exhaust system. Installed near the beginning of the exhaust system, the wall flow design of the DPF traps on average 85% of the soot coming from the engine, and in certain conditions can even attain 100% efficiency. As stringent emissions regulations increase to reduce emissions, diesel engines use an EGR valve to reduce NOx emissions and a DPF to remove soot from diesel exhaust.
0 kommentar(er)
