|
| |
Back
The Two-Stroke Cycle | Up
Mechanical Science Volume 1 of 2 | Next
Power |
DOE-HDBK-1018/1-93
FUNDAMENTALS OF THE DIESEL CYCLE
Diesel Engine Fundamentals
At 43° ABDC, the camshaft starts to close the exhaust valve. At 53° ABDC (117°
BTDC), the camshaft has rotated sufficiently to allow the spring pressure to close the
exhaust valve. Also, as the piston travels past 48°ABDC (5° after the exhaust valve starts
closing), the intake ports are closed off by the piston.
Figure 21 2-Stroke Exhaust
Figure 22 2-Stroke Intake
Compression
After the exhaust valve is on its seat (53° ATDC), the temperature and pressure begin to
rise in nearly the same fashion as in the four-stroke engine. Figure 23 illustrates the
compression in a 2-stroke engine. At 23° BTDC the injector cam begins to lift the
injector follower and pushrod. Fuel injection continues until 6° BTDC (17 total degrees
of injection), as illustrated in Figure 24.
ME-01
Rev. 0
Page 26
|
