Evaluation of Exhaust Odor in a Direct Injection Diesel Engine.

Tsunemoto, Hideyuki; Ishitani, Hiromi; Kudo, Ryuji

doi:10.1299/kikaib.62.4268

Cited by 3 publications

(4 citation statements)

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“…Almost all workers in the field of odour research have used the human nose as the primary exhaust odorant measurement technique [22][23][24][25][26][27][28][29][30][31]. In this method, the nose is used as a detector of smell.…”

Section: Human Assessmentmentioning

confidence: 99%

“…The odour threshold method does not include any evaluation of discomfort from exhaust gas and is time consuming. Undiluted exhaust gases have been checked with an odour intensity scale in some studies [26][27][28]. There are some studies where the odour intensity method and the odour threshold method both are investigated and a correlation is shown [1,6,[29][30][31].…”

Section: Human Assessmentmentioning

confidence: 99%

“…There is a significant scatter in the results recorded by human assessors when the test personnel are inexperienced, but reliable results can be obtained with experienced test personnel [28,31]. This study used three experienced assessors, and the average value of odour ratings from these three assessors has been used throughout the study.…”

Section: Human Assessmentmentioning

confidence: 99%

“…Odour rating scale A good correlation of odour with aldehydes, especially with HCHO, and THCs has been reported[1,28,31].…”

mentioning

confidence: 99%

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Effect of an oxidation catalyst and a three-way catalyst on odorous emissions in internal combustion engines

Roy

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study investigated the effect of an oxidation catalyst on odorous emissions in a direct-injection diesel engine at idling. In cold or low-temperature idling, where engines are started from cold condition at ambient temperatures, the effectiveness of the oxidation catalyst to reduce total hydrocarbons (THCs) and aldehydes is low owing to the low catalyst temperatures, and the odour reduction is insignificant. In hot or high-temperature idling, where exhaust temperatures exceed 200 uC, THCs and aldehydes are reduced by more than 90 per cent and the odour reduction is more than one point, a significant odour reduction. Below a catalyst temperature of 200 uC, objectionable exhaust odour appears.The gasoline engine also emits a strong exhaust odour when the catalyst condition is poor or there is a mismatch of air-fuel ratio. The effect of a three-way catalyst on the exhaust odour was investigated in a gasoline engine. In rich engine operation condition, there are more THCs, carbon monoxide (CO), and nitrogen oxides (NO x ) before the catalyst. After the catalyst in this condition, the THCs, CO, and NO x are significantly reduced, but there is a very sharp and unpleasant odour of ammonia, which is produced inside the catalyst owing to the reduction of NO x .

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