Cycle-to-Cycle Transient Characteristics of Exhaust Gas Emissions from a Diesel Engine with Different Increasing and Decreasing Load Patterns

970750

02/24/1997

Event
International Congress & Exposition
Authors Abstract
Content
Cycle-to-cycle changes in diesel exhaust gas emissions were investigated under two transient operation patterns: One, “an interval step decreasing and increasing load”, where the fuel amount is rapidly decreased from high to low loads, and after an interval, Δtint the fuel amount is abruptly returned to the initial level. The other is “a ramp increasing load”, where the fuel amount is increased gradually. Except just after the step increase in fuel amounts, the THC emissions were almost completely determined by the piston wall temperature and fuel amount. However, the THC concentrations immediately after the step increase in fuel amounts were much higher than the value of the corresponding steady state operation with the same piston wall temperature. This overshoot concentration, ΔTHC, was almost constant at different intervals, Δtint and it can be suppressed by ramp increased loading. The other emission components were mainly determined by the fuel amount while NOx increased slightly with increases in piston wall temperature.
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Details
DOI
https://doi.org/10.4271/970750
Pages
12
Citation
Miyamoto, N., Ogawa, H., lemura, A., and Reksowardojo, I., "Cycle-to-Cycle Transient Characteristics of Exhaust Gas Emissions from a Diesel Engine with Different Increasing and Decreasing Load Patterns," SAE Technical Paper 970750, 1997, https://doi.org/10.4271/970750.
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Publisher
Published
Feb 24, 1997
Product Code
970750
Content Type
Technical Paper
Language
English