The Mitsubishi UEC-LS II /LSE Engine Development Program
Katsuhiko SAKAGUCHI* and Osamu MOTOMURA*
Mitsubishi Heavy Industries Ltd. has been developing the UE diesel engines with its own technology since l955. The UEC75LS II type diesel engine, which is the first arrow of the UEC-LS II series engines, was completed in 1987 based on the excellent service results of the conventional UEC-LS type diesel engines. Since then, the development of UEC-LS II series engines has been proceeded step by step and the verification on test bed of UEC37LS II type diesel engine, which is the latest model of UEC-LS II series, was satisfactorily executed in the beginning of this year.
The UEC-LSE type, which is the next generation of UEC-LS II engines, was started with its development in 1998. Up to now, the UEC52LSE and the UEC68LSE type diesel engines have revealed their figures. Four sets of UEC52LSE engines were ordered and the verification test of the first engine will be carried out in the beginning of 2001.
In this paper, we would like to introduce the verification test result of the UEC37LS II engine and also the design features such as high reliability, excellent performance and low emissions of UEC-LSE engines which are well supported by proven UEC-LS II engines.
Key words: UEC-LS II, UEC-LSE, High reliability, Excellent performance, Low emissions
The development history and output range of UEC-LS II and UEC-LSE diesel engines are shown in Fig.1 and Fig.2 respectively.
The line-up of UEC-LS II series engines has now expanded through the completion of UEC37LS II type diesel engine.
The UEC37LS II engine was developed as the main engine of various small ships such as handy bulk carrier, multipurpose carrier, product carrier and chemical tanker, etc.
The first UEC37LS II verified its high reliability, excellent performance and the compliance with IMO NOx regulation through the measurement on test bed in the beginning of this year.
At present three sets of UEC37LS II engines are on order with AKASAKA DIESELS Ltd. which is one of MHI's licensees in Japan.
The UEC-LSE engines have been developed based on the long period good service results of UEC-LS II engines.
The low emissions complying with the environmental guideline in the 21st century is added as one of the design concepts to the previous high reliability and excellent performance.
The output of UEC-LSE engines is decided to be at the level of 19bar brake mean effective pressure (BMEP) as the results of the verification such as high BMEP test in UEC-LS II and test engines in MHI's laboratory and computer aided engineering (CAE), etc.