Assuming speed has less effect on emissions than air-tofuel
ratio (AFR), a speed of 1800 rpm, corresponding to
a typical engine speed when a vehicle is being tested over
the NEDC cycle, is chosen. Inlet temperature, port-induced
cylinder motion, cam timing, and combustion chamber
shape are held constant throughout the experiments. Target
parameters such as compression ratio, air-to-fuel ratio and
pressure boosting (manifold air pressure) are thoroughly
examined. Experiments and computations have been performed
for manifold air pressure 90–190 kPa, total equivalence
ratio 0.170–0.734, ratio of jet ignition to total hydrogen
0.024–0.519, and spark advance 48 to þ3 crank angle
ATDC. Other engine operating conditions are engine speed
1800 rpm, compression ratio 11, jet ignition injection timing
90 BTDC, water temperature 100 C and air pressure (dry)
99.5 kPa. Other engine speeds and compression ratios
formed part of the experimental matrix and spark advances
were not necessarily those for maximum brake torque
(MBT).
Assuming speed has less effect on emissions than air-tofuelratio (AFR), a speed of 1800 rpm, corresponding toa typical engine speed when a vehicle is being tested overthe NEDC cycle, is chosen. Inlet temperature, port-inducedcylinder motion, cam timing, and combustion chambershape are held constant throughout the experiments. Targetparameters such as compression ratio, air-to-fuel ratio andpressure boosting (manifold air pressure) are thoroughlyexamined. Experiments and computations have been performedfor manifold air pressure 90–190 kPa, total equivalenceratio 0.170–0.734, ratio of jet ignition to total hydrogen0.024–0.519, and spark advance 48 to þ3 crank angleATDC. Other engine operating conditions are engine speed1800 rpm, compression ratio 11, jet ignition injection timing90 BTDC, water temperature 100 C and air pressure (dry)99.5 kPa. Other engine speeds and compression ratiosformed part of the experimental matrix and spark advanceswere not necessarily those for maximum brake torque(MBT).
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