1978-01-01

The Diesel and the Environment: Optimisation for Clean Efficient Power 785063

Recent legislative pressures aimed at improving the environment together with an escalation in fuel prices have rendered the diesel engine the optimum prime mover in the Commercial Vehicle Market. In turn, the diesel has been the subject of intensive development. However, such is the magnitude of these pressures that development has often been aimed at isolated features of the engine, the outcome being an imbalance between sometimes conflicting operating parameters. This paper discusses the development of the high speed diesel engine across a wide front, establishing the improvements in terms of overall vehicle performance and environmental acceptability.
A scenario of the success of the diesel engine in the commercial vehicle sector is presented. This highlights the superior efficiency of the diesel engine relative to the gasoline alternative, which has been primarily responsible for the diesel's penetration in the commercial vehicle market.
The various parameters which have been subject to development are discussed on a inter-related basis. Technical and quality improvements associated with smoke compliance are discussed, along with the latest developments on emission control. Consideration is given to the continued enhancement of power within the confines of environmental legislation. Advances made in turbocharger matching within the restraints of cost relative to the engine family concept, ensure that vehicle flexibility is maintained at the high power. Short and long term approaches to noise reduction, together with factors that minimise total installation noise are presented
The relationship between engine life and load factor is explored for varying types of vehicle usage, to establish design parameters and duty cycles. These relationships are further developed by the utilisation of computer techniques that ensure option engine/vehicle matching, relative to gross vehicle weight, transmission and frontal area.
It is concluded that continued refinement of the diesel engine and its matching to the commercial vehicle will result in extended life, improved fuel economy and a more socially acceptable product

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