were ensemble averaged to yield a representative cylinder pressure
trace, which was used to calculate the apparent heat release
rate (AHRR) by the AVL 612 IndiSmart combustion analyzer. AHRR
curve was captured by use of a flexible basis of B-splines whose
knots density was automatically selected from the data. A shaft
encoder with 720 pulses per revolution was used to send engine
speed, which supplied a resolution of 0.5 crank angle (CA). The
diesel injection timing was controlled by the ECU of original engine
and was unable to be changed. The methanol injection system was
independent of the diesel ECU. Although the diesel injection timing
controlled by the original engine ECU was unable to be changed,
injection timing varied with the change of accelerator positions.
The accelerator positions pulls back as the MSP increased, thus
injection timing at diesel mode and DMDF mode was different.
Special conditions at each bound and its injection timing are
shown in Table 2. Diesel and methanol fuel consumption were
independently measured gravimetrically using two coriolis meters
with a precision of 0.1 g. Engine coolant temperature, exhaust
temperature, and inlet air temperature were recorded using K type
thermocouples with an accuracy of 1 C. The diesel used in the test
was commercial 0# diesel fuel, while the methanol used was
industrial grade with a purity of 99.9%. The main fuel properties
of diesel and methanol are given in Table 3.
were ensemble averaged to yield a representative cylinder pressure
trace, which was used to calculate the apparent heat release
rate (AHRR) by the AVL 612 IndiSmart combustion analyzer. AHRR
curve was captured by use of a flexible basis of B-splines whose
knots density was automatically selected from the data. A shaft
encoder with 720 pulses per revolution was used to send engine
speed, which supplied a resolution of 0.5 crank angle (CA). The
diesel injection timing was controlled by the ECU of original engine
and was unable to be changed. The methanol injection system was
independent of the diesel ECU. Although the diesel injection timing
controlled by the original engine ECU was unable to be changed,
injection timing varied with the change of accelerator positions.
The accelerator positions pulls back as the MSP increased, thus
injection timing at diesel mode and DMDF mode was different.
Special conditions at each bound and its injection timing are
shown in Table 2. Diesel and methanol fuel consumption were
independently measured gravimetrically using two coriolis meters
with a precision of 0.1 g. Engine coolant temperature, exhaust
temperature, and inlet air temperature were recorded using K type
thermocouples with an accuracy of 1 C. The diesel used in the test
was commercial 0# diesel fuel, while the methanol used was
industrial grade with a purity of 99.9%. The main fuel properties
of diesel and methanol are given in Table 3.
การแปล กรุณารอสักครู่..
