Characteristics and Control of Low Temperature Combustion Engines by Rakesh Kumar Maurya

Author:Rakesh Kumar Maurya
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The partial fuel stratification (PFS) is another strategy to achieve higher engine loads in LTC regime (see Sect. 2.2.4.6 of Chap. 2). In PFS, some portion of fuel is injected directly in the cylinder to create the stratification, which lowers the pressure rise rate due to sequential autoignition of the charge. Figure 6.16 shows the effect of single and dual direct injection on HRR in HCCI combustion different amount of direct fuel injection quantity. In single fuel injection case, fuel is injected at start of injection (SOI) timing 60° CA from start of intake stroke. This injecting timing is found to have higher thermal efficiency. In case of dual direct fuel injection case, injection timing is held constant at 60° and 305° CA position from intake TDC for constant combustion phasing (CA50) at 372ºCA. The charge equivalence ratio (φ m ) is constant for all the test. Hence, fuel fraction of first injection proportionally decreases, when second injection amount is increased (0 to 35%). Constant combustion phasing is maintained by adjusting amount of EGR. Experiments are conducted at intake pressure of 2.4 bar as fuel is found to be strongly φ-sensitive at this boost pressure.

Fig. 6.16The effect of single and dual direct injection on HRR at constant combustion phasing in HCCI engine at 1200 rpm (Adapted from [26])

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