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In this paper, optimization problem of after treatment system is investigated for diesel engines with lean NOx trap (LNT). First, a control-oriented LNT model is developed based on energy and mass balancing rules. Then, the optimization problem is formulated as a dynamic programming (DP) problem under developed dynamical model constraint and a trade-off between fuel economy and NOx emission is considered...
With the requirement of the emission regulations for the transient working condition of the vehicle diesel engine and the increasing demand of the public to the energy saving, the optimization of the transient performance of the engine based on DSPACE is very important. To this end, this study carried out on a turbocharged diesel engine under transient operating conditions of the test and analysis...
Usually electric tugboats are equipped with diesel engine based electric generator for power production, battery for supplying power to auxiliary loads and electric motors for propulsion. This paper proposes control strategies for diesel engine and electric generators used in electric tugboat to improve energy efficiency of the system. Doubly fed induction machine (DFIM), asynchronous in nature, is...
Recovering energy from exhaust gas is seen as the promising solution to save fuel consumption of diesel engines, where the key issue in maximizing fuel economy benefits is the management of energy flows in the optimal way. This paper proposes a systematic control strategy on both energy management and air path regulation of an electrified turbocharged diesel engine (ETDE). The Energy management and...
This paper presents optimal generation scheduling for minimization of fuel consumption (FC) in an offshore support vessel with a dynamic positioning system and diesel generator (DG) sets of 8000 kW total capacity. FC is analyzed for equal load sharing among equal capacity DGs, optimal load sharing among equal capacity DGs, and optimal load sharing among unequal capacity DGs. Due to nonlinear specific...
With the application of multiple-pulse fuel injection profiles, the performance of diesel engines is enhanced in terms of low fuel consumption and low engine-out emission levels. However, the calibration effort increases due to a larger number of injection timing parameters. The difficulty of controlling the combustion phase also increases because of coupling between individual fuel injection pulses...
The fuel efficiency and emission reductions are the two consistent drivers for diesel engine development. Although many control devices mounted in diesel engine and in addition to the development of individual emission control methods, optimization techniques are required to utilize these methods in finding optimal engine operating conditions efficiently. This research was focused on the minimization...
In the test, the engine run at a specific speed when fuel consumption (Be) and torque remained constant. An ETAS calibration system is used to control the Maps for adjusting the rail pressure and injection timing. Experimental data show that when fuel injection is delayed, fuel consumption, CO and HC increase while formation of NOx reduces. The formation rate of pre-mixed gas is proportional to the...
Tests were performed with a light-vehicle diesel engine. Four representative operating conditions in 1600r/min speed have been considered. The influence of injection pressure, injection timing, and multiple injection strategies on the diesel engine emission characteristics and fuel consumption has been investigated. The results show that low NOx and soot emissions can be obtained in the condition...
The key technologies of single-cylinder-air-cooled diesel (SCACD) include the aspects of small size, high mechanical efficiency, high volumetric efficiency, optimized combustion system and cooling system. The SCACD was high-strengthened better at the performance of mechanical efficiency, fuel consumption, noise as well as emission with the technologies mentioned above, and that is authenticated by...
A four-stroke direct injection diesel engine is taken as the study object, and a cylinder-jacket-coolant-piston coupling model is built up. With the research method of fluid- solid-heat coupling, the computational regions of both fluid and solid are coupled, which are separated in traditional temperature-field computation, and the puzzle of iterating difficultly due to the differences of temperature...
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