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| Injection Strategy Optimization of Auxiliary Power Unit Engine for an Electric Vehicle |
| DOI：10.13949/j.cnki.nrjgc.2019.05.008 |
| Key Words:auxiliary power unit model fitting injection strategy emission |
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| Download times: 2267 |
| Abstract:In order to study the effect of rail pressure, main injection timing, pre-injection timing and pre-injected fuel amount on the fuel consumption and NOx emission characteristics of the auxiliary power unit(APU) engine for an electric vehicle, according to the operating characteristics of the APU engine under different operating conditions, together with the vehicle's power demand and optimal operating area of the matched generator, the basic control strategy of multi-mode was adopted, and three steady-state operating points were selected as the operating conditions of the APU engine. Then, based on the space filled+V optimal design method, the hybrid test was adopted, and an engine performance and emission fitting model was established by using the regression calculation and neural network model. Under the given conditions of engine performance optimization conditions and optimization objectives, the normal boundary intersection optimization method was used to optimize the double target with minimum fuel consumption and NOx emissions, and the optimal fuel injection strategy for three steady-state operating points was determined. Results show that compared to the original engine, the optimized fuel consumption of each mode is reduced by 4.03% on average, and the average NOx emissions is reduced by 30.51%. |
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