The second term on the RHS of (18) accounts for the decrease in NO concentration as a result of the increasing cylinder volume during the expansion stroke
Looking at Figures 11, 12, 13, the vortex chamber shows a higher pressure and continually rising cumulative apparent heat release in the expansion stroke
compared to the non-vortex counterpart.
Also, from Figure 20, it can be seen that, at the engine speed of 3000 rev/min, the heat release rate curve rises during the expansion stroke
. This indicates a late heat release in this case.
The average torque in the compression stroke and the expansion stroke
are approximately equal in the second stroke period for a crank angle of between 180 to 360 degrees.
"Linear free piston engines can capture a much greater proportion of the energy contained in the fuel burnt, not only because the linear gas expander extracts electrical power directly from the expansion stroke
, but also by optimising the motion of the piston to improve combustion efficiency."
The computer program calculates in discrete crank angle incremental steps from the start of the compression, combustion and expansion stroke
. The program configuration allows through subroutines to improve the clarity of the program and its flexibility.
The unit underwent a full model change in 2011 as MCHP1.0K2, featuring Honda's EXlink (Extended Expansion Linkage Engine)(2), featuring an expansion stroke
longer than its intake stroke, resulting in a high expansion ratio for greatly increased thermal and fuel efficiency.
At low crankshaft revolutions values (under 2500rpm) the top pressure decrease is caused mainly by the considerable increase of the fast combustion phase duration, the point in which the top pressure occurs moving towards the expansion stroke
Regenerating the filter requires altering the amount of air and fuel fed into the engine, and can be supplemented by feeding unburned fuel into the NOx catalyst during the expansion stroke
. This raises exhaust temperatures above the 600[degrees]C necessary to burn the ash trapped by the filter.
C-Brake makes use of a hydraulic circuit to open cylinder exhaust valves during the engine's expansion stroke
. With the retarder in place, the fuel supply to the cylinder is stopped.
The challenge of the split cycle combustion system can therefore be summarised as: get the air into the chamber in the shortest possible time, mix with the fuel and initiate combustion before the piston begins the expansion stroke