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| Research on Control Parameters and Performance of Variable Nozzle Turbocharger Common Rail Diesel Engine at Different Altitudes |
| DOI：10.13949/j.cnki.nrjgc.2022.03.006 |
| Key Words:diesel engine plateau environment turbocharger matching powerrecovery |
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| Abstract:The atmospheric pressure simulation system and engine bench were used to target diesel engine power performance to solve the problems of diesel engine power reduction， fuel economic deterioration and supercharger overspeed in plateau environment. The diesel engine boost pressure， fuel injection advance angle， rail pressure and fuel injection volume were coordinated and calibrated at altitudes of 0 m， 1 000 m， 2 000 m and 2 400 m. The results showed that the power output of the diesel engine in the plateau environment could be recovered to a great extent under the limitation of the turbocharger speed， cylinder pressure， exhaust temperature and smoke limit， by controlling the target pressure， advancing the injection timing， increasing the common rail pressure and reducing the injection volume. The maximum torque at altitudes of 1 000 m、2 000 m、2 400 m decreased by 2.71%， 6.67% and 11.16% respectively compared with that at 0 m. The maximum power decreased by 0.57%， 3.24% and 10.09% respectively. The lowest specific fuel consumption increased by 2.13%， 4.62% and 5.62% respectively. And the corresponding specific fuel consumption of maximum power increased by 0.51%， 1.74% and 2.29% respectively. The change of NOx emissions with altitude was related to engine operating conditions. When the speed was lower than 2 000 r/min， NOx emissions decreased with the increase of altitude. And when the speed was higher than 2 000 r/min， NOx emissions increased significantly. As the altitude increased， the smoke of diesel engine gradually increased， especially at low speeds. |
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