Marine emergency diesel generators is the forced cooling fan, water tank, intelligent unit with double energy start and automatic start function. And can realize the automatic / manual / emergency stop function selection, alarm and protection function: the advantages of starting failure, overspeed, low oil pressure, Gao Shuiwen alarm, overspeed emergency. When the unit is in the self starting condition, unit detection to the main power failure, automatically start unit, acceleration, issued a switching signal, from unit detects main power failure signal to the output signal of the switching time less than 45 seconds. When the detection to the main power supply is normal, the unit automatically tripping, deceleration, stop. Is the security of ship navigation.