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DEUTZ has manufactured air-cooled Diesel engines since the 1940s. The basic design of some of the air-cooled engines in production today dates back to the 1970s, a time when fuel economy, reliability and durability were the greatest concern. Extremely stringent U.S. and European heavy-duty on-highway standards have been implemented resulting in very clean engines for truck and bus applications that are now in the market. Meanwhile, the U.S. EPA, the State of California and the European countries have developed (or are in the process of developing) exhaust emission regulations for industrial engines. These requirements are being finalized and will be implemented in the mid 1990s. It is very encouraging to recognize that there have been definitive steps towards an international harmonization of the emission legislation between Europe and North America.

Diesel engines have become the “workhorse” of industry. They are the prime power source for many industrial and commercial applications because of their reliability, rugged construction and fuel economy. The presence of particulate matter in the exhaust gas, however, has “tarnished” the diesel engine's image. Soiling, visibility reduction and potential health effects are some of the problems being associated with diesel particulates. Extremely stringent U.S. and European heavy-duty on-highway standards have been implemented, resulting in clean burning diesel engines for truck and bus applications. Some engines are just below, or slightly exceed, the legislated particulate standards. Meanwhile, the U.S. EPA, the State of California and the European countries have developed (or are in the process of developing) exhaust emission regulations for industrial engines, to be implemented in the mid/late 1990s, which also contain particulate standards.

This paper addresses the subject of engines for non coal non-gassy mine applications and presents a proposal for worldwide harmonized emission standards. Diesel-powered equipment is extensively utilized in underground hard rock and coal mines. This is due, to a great extent, to the efficiency and safety characteristics of the Diesel engine. Regulations are in place addressing the emission quality of these engines. Furthermore, sufficient mine ventilation must be provided in order to ensure that pollutant levels in the working environment don't exceed permissible levels. Historically, Diesel engines featuring Indirect Injection (IDI) combustion systems have been preferred for underground mining operation due to their cleaner exhaust gas characteristics. The ever increasing stringency of the emission requirements applicable to on-highway trucks has resulted in Direct Injected (DI) Diesel engines with emission characteristics equal to, or in some areas, better than IDI engines.

The development of European emission regulations for automotive heavy-duty Diesel engines began in the mid 1970s; the latest modifications to test procedures and standards have been in place since 1988. Presently, the emphasis of the European regulatory activities is in the areas of increasing the stringency of the gaseous standards and developing particulate standards. For non-automotive industrial engines, test procedures and standards are presently under consideration. Implementation of these requirements is anticipated in a two-stage approach beginning in the mid 1990s. This paper provides an overview of the present and future European exhaust emission requirements.

Diesel engines have become the prime power source for many industrial and commercial applications thanks to their reliability, rugged construction and fuel economy. However, concerns over the effect of diesel exhaust (health, visibility, soiling, ect.) have “tarnished” the image of these engines. Regulatory agencies in North America and Europe have published stringent emission requirements. Increased stringency is anticipated in the years to come, which make necessary the use of diesel particulate filters. This paper describes a fully automatic particulate trap system developed by Klöckner-Humboldt-Deutz AG (KHD), which offers a solution to the problem of particulate emission. Such a system is suitable for installation in new vehicles as well as retrofitting of existing ones.

High speed Deutz Diesel engines are characterized by modular design and air cooling. Turbocharged, charge air cooled engines feature an air-to-air cooler which is an integral part of the engine cooling system. Engine air cooling allows for two basically different charge air cooling system arrangements, whereby the cooler can be placed in-line or parallel to the engine cooling system. In this study, the characteristics of both arrangements are highlighted and their influence on the emission quality of the engine assessed. The comparison between both systems, related to the same engine rating, is based on the U.S. Transient Test Procedures. Furthermore the influence of different engine configurations and the engine temperature control system is described.