DOE Approach for Optimizing the Combustion Parameters with Multiple Injection Strategy in Light Duty Diesel Engine

Multiple Fuel Injection Strategies for Compression Ignition Engines

“…A load dependency has also been observed, albeit with a lessened effect of favorable behavior as compared to pilot injections. Overall, it has been reported that main injection splits can be effective at all loads, with generally dampened effects at high load [45,52,78].…”

“…The original notion that NO x reduction could be attributed to a decrease in peak heat release rate has been confirmed many times [18,46,50,51,53,58]; however, a strong load dependency has also been reported [29,46,50,51,58,68,78]. Every pilot quantity has been explored that can still be considered a "pilot" injection (i.e., quantities less than 50%), and pilot injection timing has been tested as early as 90 • BTDC (i.e., the compression stroke) [54].…”

“…Concurrently, Barman et al [78] used a design of experiment (DOE) approach to optimize the multiple injection strategy for their light-duty CI engine. The engine speed was varied from 700 to 2600 rpm over a range of loads and employed up to four injections.…”

“…At medium load, it has been reported that pilot influence starts to lessen and requires a larger pilot quantity (around 18-30%) [17,18,21]. At high loads, pilot injections are often reported to have little to no influence on combustion [46,51,58,78]; however, some researchers had success with NO x and noise reduction at high loads [19,52,65]. This lessened pilot influence as load progresses has been thought to be a function of the decreasing premixed combustion phase, whereas low load is predominately premixed.…”

“…While some researchers found a growth in PM emissions while using pilot injections [19,20,75], many have experienced reductions in PM with little to no penalty in NO x production [50,77,79,82]. Conversely, researchers have seen NO x reductions with little to no penalty in PM levels [35] and even simultaneous NO x and soot reduction [21,42,51,59,65,72,78,83] as compared to a single injection event.…”