Reciprocating internal combustion engines -- Exhaust emission measurement -- Part 9: Test cycles and test procedures for test bed measurement of exhaust gas smoke emissions from compression ignition engines operating under transient conditions

This document establishes a specific set of procedures for testing exhaust smoke emissions from compression-ignition engines mounted on test benches under transient operating conditions. It serves as an integral component within a broader series concerning measurements for exhaust emissions of reciprocating internal combustion engines. The defined test cycle and associated procedures provide a standardized method to evaluate the performance and compliance of such engines during dynamic load changes, rather than under steady-state conditions. This framework ensures that test results are consistent, reproducible, and comparable across different facilities and regions. By specifying the operational sequences, measurement instrumentation requirements, and data reduction techniques, the document facilitates a uniform approach to assessing black smoke emissions generated by these engines. The methodology described is essential for regulatory assessments and manufacturer evaluations where accurate characterization of transient exhaust behavior is required to meet environmental and performance criteria.