Diesel Particulate Filter Regeneration Fuel Injection Strategy

The fuel injection process is segmented into multiple distinct phases: a main fuel injection event, followed by a first heat post-injection event, and then a second heat post-injection event. Each phase serves a specific function in controlling exhaust temperature while managing fuel dilution. The segmentation allows precise control over when fuel is introduced and how it combusts, enabling temperature management without excessive fuel dilution.

The fuel injection strategy dynamically adjusts the timing, duration, and quantity of fuel injections based on real-time engine operating conditions and regeneration requirements. The control system monitors exhaust gas temperature and particulate matter accumulation, then dynamically modifies the injection parameters to achieve optimal regeneration while preventing excessive fuel dilution. This dynamic control enables adaptation to varying engine loads and operating conditions.

The main fuel injection event is designed to occur before the heat post-injection events, creating a preliminary combustion that establishes baseline exhaust gas temperature and oxygen consumption patterns. This preliminary action prepares the exhaust environment for the subsequent heat post-injections, ensuring that the additional fuel from post-injections burns more completely and contributes to temperature control rather than simply increasing unburned fuel and dilution.

The injection strategy changes multiple parameters including injection timing, injection duration, and fuel quantity across the three injection events. The heat post-injections use different timing and quantity parameters compared to the main injection, allowing optimization of combustion efficiency. By carefully adjusting these parameters, the system achieves enhanced particulate oxidation while maintaining acceptable fuel dilution levels and minimizing unburned fuel.