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Much attention has been paid to the emissions from diesel transit coaches culminating in the 1990 EPA bus standard.(1)* A primary pollutant that has been singled out for advanced controls is diesel particulate. In order to meet the low levels of particulate emissions in the standard, diesel particulate filters are one of the principle methods being studied. To this end, the Ministry of Transportation and Communications of Ontario and Engine Control Systems Ltd. entered into a cooperative development program for a low cost, simple and retrofitable diesel particulate control system.(2) The paper outlines the various components of the system and the results of field testing.

Following considerable laboratory studies concerning particulate control systems for underground use, a program was commenced to develop practical real life implementation systems. This program covers the implementation in seven mines of particulate system to 14 engine models from four engine manufacturers in 18 different vehicle types, a total of 23 vehicles. Partially funded by the Canadian National Research Council, under its IRAP program, this program requires detailed analysis of operating cycles, maintenance variabilities and installation implementation problems. This paper summarizes the work carried out todate to define real world targets for practical underground particulate control.

Considerable work has been carried out to develop particulate control systems for light duty vehicles. These systems are required to operate under widely varying conditions of service. Examination of the extremes of operation shows the importance of the regeneration ability of the control system employed. In addition, a major requirement for a practical control system is minimum complexity. Discussed here is a catalyst system and the extension of the technology to allow for minimum complexity and the ability to operate at the defined extremes of use. The theory of the TRIM System and the results of evaluations on vehicles and test benches are given.