As observed from Figure 9 , when the DIT was unchanged, the CO emissions first showed a rapidly decreasing trend; subsequently, it showed an increasing trend, and finally, it showed a decreasing trend with an increase in the NGSR.
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Prediction and Verification of Performance and Emission Characteristics of Diesel/Natural Gas Dual-Fuel Engine Based on Intelligent Algorithm.
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The sentences
Under the same DIT conditions, with an increase in NGSR, CA50 showed a trend of advancing first and then delaying.