A Status Report on the Development of the 1973 California Diesel Emissions Standards 700671

This paper is a summary of the cooperative effort by the California Air Resources Board Staff, the Engine Manufacturers Association, and the SAE Diesel Emissions Subcommittee to develop the test procedures and measurement methods needed before adoption of emissions standards for unburned hydrocarbons, carbon monoxide, and nitrogen oxides from diesel engines. Emphasis is placed on the development of the 13-mode test cycle and on the philosophy and reasoning behind the use of new or different procedures such as brake specific emissions (gm/bhp-hr) and the expression of oxides of nitrogen as nitric oxide. An unapproved working draft of the Test Procedure is included as an Appendix.


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