Abstract: The invention provides a voltage control apparatus of an engine generator having a simple structure and capable of being made compact, and a control method thereof. Accordingly, in a method of controlling a voltage of an engine generator, the method includes steps of detecting an actually measured value (Ne) of an engine rotational speed at every predetermined time and controlling an output voltage of the power generator (4) in accordance with a deviation value (&agr;1) between a predetermined target value (Ne1) and the actually measured value when the actually measured value is equal to or less than the target value.

Abstract: The present invention is a method of controlling a fuel injection apparatus for an internal combustion engine, and is capable of preventing the breakage of a component which is exposed to high-temperatures, such as an exhaust manifold. To this end, a first set temperature and a second set temperature, higher than the first set temperature, are set in advance, and a temperature of exhaust gas from an internal combustion engine (1) is detected. The number of occasions at which the temperature of the exhaust gas exceeds the first set temperature and the lengths of time during which the temperature of the exhaust gas has exceeded the second set temperature are totaled respectively, and either when the total number of occasions exceeds a predetermined number of occasions or when the total of the lengths of time exceeds a predetermined length, at least one of the following actions are taken: giving an alarm, reducing a fuel injection rate and changing the injection timing.