The program which simulates the crash astern ability of direct coupled two stroke diesel engine was developed especially on the point of engine performance. And for the various kinds of ships the simulations were carried out with good accuracy. As the results of the simulations, the importance of various parameters which have the influence on the crash astern was found. We have selected three parameters as below.
•Specified engine revolution when brake air is put into
•The air pressure of air reservoir
•The open and close timing of starting valve
The valve timing is regulated by the distributor cam and the valve is opened by the elevated air pressure. So, the timing on the point of crank angle is delayed more when the revolution is higher.
We must consider both starting from 0 revolution and starting and braking from some revolution such as crash astern. And for these the time delay should not be ignored.