EMS is an electronic system that makes it possible to programme each individual engine to meet the operator's specific demand for parameters such as rpm and workload. In running the engine, Scania EMS monitors and processes thousands of pieces of data every second, evaluating the information to adjust injection timing and the amount of fuel injected to ensure optimum combustion and fuel consumption in response to operating conditions.

'The reason for using electronic engine management is to optimise fuel consumption while keeping emissions as low as possible, said Mr Hjelte. 'It makes the engines more complex but it also makes it possible to manage and control the performance.'

Another important function provided by EMS is the possibility to log engine performance. The owner can get information on how the engine has been used, such as power output at a specified engine speed, how long the engine has been running, plus water temperature and oil pressure during a cycle. The system also reports any problems that might have arisen. The EMS software has been developed in-house by Scania and can communicate with other systems via the CAN-bus interface.

The six cylinder in-line DI12 EMS engine is a turbocharged, air cooled four stroke diesel featuring four valves per cylinder and individual cylinder heads.

It will be available in an output range of from 400 to 650hp when production begins this autumn. It is equipped with one unit injector per cylinder, with the injection electronically actuated and the fuel injected into the combustion chamber under very high pressure. The engine has been developed to comply with all foreseeable future emission regulations and meets US Tier 2 standards as well as the European Stage 3 rules, which go into force in 2007.

The DI 12 EMS is part of Scania's modular engine range, with 12 and 16 litre models sharing major components such as pistons, connecting rods, cylinder heads and cylinder liners. This results in easier parts handling and distribution as well as a commonality of workshop methods which makes maintenance work more efficient.

MJ Information No: 19641