Investigation of cold start emissions from passenger car with di diesel engine using the modal analysis method

The stricter exhaust emission regulation which a new engine construction have to fulfil, causing continuous necessity development of research tools which make possible an analysis of engine operation at an angle of reduction exhaust emission. One of these research tools is the modal analysis method, which with success found application in exhaust emission tests on chassis dyno for testing complete cars and on engine test bed for testing engines as well. The modal analysis method has been used for the analysis of the emissions from passenger car with direct injection (Dr) diesel engine in the initial period of controlled engine operation following start-up. The tests were undertaken in "cold start" mode (temperature of cooling water and lube oil equal to ambient temperature). The paper subject is analysis of cold start emissions of cars powered by DI diesel engine. Exhaust emission tests results presented in the paper were carried out using the modal analysis method at Exhaust Emission Testing Laboratory of BOSMAL Automotive Research and Development Centre in Bielsko-Biala, Poland within research program investigating problem of cold start emissions for SI and CI at normal and low ambient temperature conditions.