The effect of the back pressure on the engine power loss is analyzed at different rotating speeds using GT-POWER simulation software.
The motor is there to boost torque at low revs, critical for one-tonne payloads, consequently taking pressure off of the engine and improving fuel economy.
In calculations, the temperature and pressure cannot exceed the maximum allowable temperature and pressure of the conventional engine, i.e., constant compression ratio, which are 2,100 K and 10.7 MPa, respectively.
Therefore, with the use of the near α and α/β variants for safety critical components in the low and high pressure compressor sections of the engine, the potential effects of "cold dwell" continue to compromise design.
The design injection-pressure of the diesel engine, for the turbocharger and pre-combustion chamber used, is 150 bar.
"We believe the cracking is caused by the variety of pressures the engine is undergoing," said Mark Sullivan, a spokesman for Pratt & Whitney, a unit of United Technologies.
Then time responses of the rail pressure of a real engine and of the simulator are compared in order to check the accuracy of the model.
The huge extra pressure of an engine surge can damage the engine intake.
These pressure waves force parts of the engine to vibrate, which produces an audible knock.
