2013 DOE Annual Merit Review - ACCESS - Department of Energy
2013 DOE Annual Merit Review - ACCESS - Department of Energy
2013 DOE Annual Merit Review - ACCESS - Department of Energy
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<strong>2013</strong> <strong>DOE</strong> <strong>Annual</strong> <strong>Merit</strong> <strong>Review</strong> – <strong>ACCESS</strong> – Technical Accomplishment<br />
Cam Pr<strong>of</strong>ile Design for SACI & HCCI<br />
Trapped R esidual R equirement – SACI vs. HCCI<br />
• Wide range <strong>of</strong> trapped internal res iduals<br />
requires large cam phas er a uthority<br />
• Lower trapped internal res iduals with<br />
increas ing load res ults in later E V C s<br />
Cam Pr<strong>of</strong>ile R equirement– SACI vs. HCCI<br />
• Later exhaust valve closing results in later exhaust<br />
valve opening potentia lly a fter B DC<br />
• Delayed E V O can res ult in s ignificant pumping los s<br />
• E xtended cams haft pr<strong>of</strong>ile duration can avoid this<br />
250 270 290 310 330 350<br />
Extended cam duration and timing range required for optimized NA HCCI/SACI<br />
Relative Frequency [%]<br />
50<br />
0<br />
50<br />
0<br />
50<br />
0<br />
PMEP [bar]<br />
EVC Timing over Operating Range<br />
Supercharged HCCI<br />
Turbocharged HCCI<br />
250 270 290 310 330 350<br />
NA SACI<br />
250 270 290 310 330 350<br />
EVC [CAD]<br />
0.5<br />
0.45<br />
0.4<br />
0.35<br />
S ACI<br />
2500 R PM<br />
4 bar B ME P<br />
305 310 315 320 325 330<br />
EVC [CAD]<br />
36<br />
Gasoline S ystems | 5/17/<strong>2013</strong> | © <strong>2013</strong> R obert Bosch LLC and affiliates. All rights reserved.
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