When the vehicle is maintaining a constant speed and requires low engine output, CVVD opens the intake valve from the middle to end of the compression stroke
. This helps to improve fuel efficiency by reducing the resistance caused by compression, said the statement from Hyundai.
A critical issue in such methodologies is the description of the flow structure decay during the compression stroke
, due to the shear stresses.
This study explores the ability to use a high compression ratio GDI engine and open the exhaust valve at the end of the compression stroke
immediately before fuel injection to bleed off pressure.
Finally, momentum in the crankshaft drives the piston back up for a compression stroke
, and new air and fuel fill the crankcase from the carburetor.
Through the intake stroke and early part of the compression stroke
, the particle temperatures drop, consistent with the heat transfer to the much cooler fuel-air mixture for an intake air temperature of 20[degrees]C.
The upgraded fuel can withstand a greater rise in temperature during the compression stroke
of an internal combustion engine without auto-igniting.
When in the compression stroke
, the process is a little more complicated and the flow process can be divided into two parts:
In consideration of the relationship between the velocity of midpoint and the resulting TDC position that is close to linear correlation , this paper proposes a combustion optimization control strategy which varies the electromagnetic resistance force based on the velocity of midpoint(the half-stroke point in the compression stroke
), and the block diagram for control logics is shown as Fig.
Then there is a compression stroke
that presses the resin through the preform so that it is entirely saturated.
In figure 1A, the piston is at the end of the suction stroke about to start compression and in figure IB, the compression stroke
has just been completed.
During the compression stroke
of a spark ignition engine the pressure, density, and temperature are increased.