【作者】

Keiichi Tsujimoto

【摘要】

论文已在中国上海举行的第27届CIMAC大会上发表。论文的版权归CIMAC所有。For diesel engines, which are commonly used as the main engines of domestic vessels the electronic control technology is recently considred as effective to environmental issues. In order to meet environmental regulations and to satisty customer needs, Yanmar has developed the EUP(Electronic controlled Unit Pump) system for medium speed four-stroke diesel engines. EUP system consists of jerk type fuel injection pump, solenoid valve, ECU and sensors. In this system, fuel injection pressure is depending on cam speed. However, solenoid valve can control fuel injection timing and fuel injection quantity depending on engine operating condition. Then, this system can improve fuel consumption, NOx emission improvement of trade-off relation), smoke generation and ship handling As to improving fuel consumption combustion was improved and fuel injection timing map was optimized. Smoke generated at the engine start and acceleration has been reduced to less than 50% in comparison with conventional engine by con trolling injection timing and fuel limiter. ECU has the function to improve ship handling like clutch engaging and crash astern maneuver. At a moment of engaging the clutch, high load is put on the engine and engine peed goes down. Increasing engine speed just be fore engaging the clutch and controlling fuel injection quantity reduce the drop of engine speed. As result of this, ship handling during docking and undocking is improved. For the marine propulsion engine, high reliability is required especially for the ship with one shaft and one engine. In this case EUP system has 2 ECU and 2 important sensors. When main ECU or important sensors fail, system is switched immediately from the main to the backup. Basic structure of fuel injection pump is same as conventional mechanical engine and conventional fuel injection nozzle is available to us therefore EUP system is easy to retrofit. First delivery of this system to the market was in October 2009 as a propulsion engine. As of November 2012, this engine has been operated more than 4,000 hours. As the next step, Yanmar is developing EUP for the marine auxiliary engines which heavy fuel is used for. Auxiliary en-ne is main product of Yanmar and it is used in world wide marine transportation. In 2013, CO2 regulation by IMo will go into effect and EEDI (Energy Efficiency Design Index)is applied to indicate the energy efficiency of the ship, which is calculated in design stage From the point of view of the ship builder, the technol ogy like solar power, wind power, air lubrication sys-tem and re-designing the shape of the ship are considered. On the other hand, the engine manufacturers improve EEDI by developing gas engine, heat recovering system and improving fuel consumption. Of these fuel consumption is a biggest concern. Therefore, they make great effort to improve it. In latest test result of Yanmar, 2-3% of fuel consumption was reduced at the partial load of auxiliary engine. Yanmar believes EUP system is one of the solutions to improve EEDL

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

返回