Engine, engine exhaust temperature controlling apparatus, and controlling method

Abstract

The present invention has been realized in order to keep the cylinder exhaust temperature of a gas engine within a predetermined range, and thereby prevent the generation of misfire and knocking. In the present invention, in S, when the number of rotations of the engine is greater than a predetermined number, in S, the exhaust temperatures of the cylinders are sampled at predetermined intervals, in S, an average of the exhaust temperatures is calculated, in S, the load factor at that point is determined, in S, the average exhaust temperature Tis compared with the exhaust temperature T() of each cylinder, and it is determined whether the deviation ΔTis greater or smaller than the set deviation Tfor that load factor. When the deviation ΔTis smaller, the exhaust temperature is within the set deviation and there is no need to adjust the fuel spray period, and therefore the sequence returns to S. When the deviation ΔTis greater, in S, it is determined whether to increase or reduce the opening period of the electronic fuel spray valve. When increasing the opening period, the sequence shifts to S, and when reducing the opening period, the sequence shifts to S. Then, in S, if the engine exceeds the predetermined number of rotations, the processes of Sto Sare repeated; in S, if the engine is below the predetermined number of rotations, the control operation ceases.