The significant reduction of intake pressure
along with the changing valve overlap during the tip-out results in a large increase of internal residual.
Figure 3 shows that in this study the residual gas level ranged from a maximum of 7% at a throttled, 60 kPa intake pressure
condition, to a minimum of 2% at a boosted 146 kPa intake pressure
In order to ensure that the test is comparable, an automatic constant-pressure valve is installed onto the intake airline between the mixer and the engine to ensure that intake pressure
is in consistency with that under normal inlet running condition.
This may be due to increase in intake pressure
and temperature of charge entering in to the cylinder along with the steam through inlet manifold.
The intake pressure
is regulated by pressure control unit.
Parameter Description Value 1 Q Cooling capacity 300 W (1023.6 Btu * h-1) 2 n Motor speed 1800 rpm 3 [T.sub.eva] Evaporation 5[degrees]C (41[degrees]F) temperature 4 [T.sub.con] Condensation 46[degrees]C temperature (114.8[degrees]F) 5 [P.sub.in] Intake pressure
0.35 MPa (50,763 psi) 6 [P.sub.out] Back pressure 1.20 MPa (174,045 psi) Table 2.
That causes an air leak and a loss of intake pressure
. Then the engine doesn't get enough cool air to keep it running smoothly--especially in hot weather.
As the pressure ratio ([p.sub.e]/[p.sub.i]) and the compression ratio are varied, the fraction of the cylinder volume occupied by the residual gas at the intake pressure
To that effect, the test gun came with a special adapter to limit the intake pressure
to 125 psi.
Sensor input is provided regarding yaw rate, wheel speed, steering angle, throttle position, lateral g forces, and front/rear g forces, as well as the engine rpms, intake pressure
, and transmission gear ratio.
The volume of the manifold's plenum is tuned to resonance together with the length of the inlet passages to amplify intake pressure
waves thereby assisting charge, air filling of each cylinder.