As Improvement on Performance in Marine Diesel Engines by Use of Electronic Control Systems

In recent years, electronic control systems have been widely used for the engine. The authors developed a new system using hydraulic-actuated mechanisms, and applied to the fuel injection control and the drive control of he suction valve/exhaust valve of the medium-speed four-stroke test engine. Then, it was applied to the fuel injection control system and the exhaust valve drive system of the largebore, two-stroke test engine, and it was confirmed that it is possible to achieve the same or higher engine performance as compared to the case with conventional cam system. Moreover, combining "Electronically Controlled Exhaust Valve system'' and ‘‘Scavenging Controlled Valve system" as a mechanism of a new concept, the authors were able to control freely the scavenging air and exhaust timing of engine. As a result, the effective work of the engine was increased, and the specific fuel oil consumption was improved by 8g/kwh.