An experimental investigation of the effects of cyclic transient loads on a turbocharged diesel engine

Yum, Kevin Koosup; Lefèbvre, Nicolas; Pedersen, Eilif

doi:10.1016/j.apenergy.2016.10.138

Cited by 18 publications

(5 citation statements)

References 13 publications

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“…For this reason, shop trials are generally performed by engine manufacturers to measure the SFC characteristics under ideal and stable load conditions using special test facilities because large marine diesel engines have large thermal capacities and delayed turbochargers. Many previous studies on diesel engines have shown that the thermal efficiency is different under transient load conditions versus steady constant load conditions [41]- [44].…”

Section: B Filtering Variation With CVmentioning

confidence: 99%

Efficiency Estimation of Synchronous Generators for Marine Applications and Verification With Shop Trial Data and Real Ship Operation Data

2020

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Three methods were explored to estimate the efficiency for the conversion of mechanical power to electrical power using synchronous generators in ships at low power factors. Generally, the generator efficiency data is provided by manufacturers as shop trial data and is measured by operating generators under power factor of 0.8 and 1.0. However, the efficiency of synchronous generators is not measured under low power factor of less than 0.8. In practice, onboard generators occasionally operate at low power factor and it is desirable to clarify their characteristics for power system designers of large vessels. By substituting the shop trial data into the proposed efficiency estimation formulas, the generator efficiency at low power factor was extrapolated. To evaluate the validity of these methods, the fuel consumption characteristics of diesel engines as prime movers was focused. The estimation of the generator efficiency was indirectly validated using a statistical analysis of long-term observational data of the generator in operation. As a result, the efficiency estimation method based on a power loss mechanism gave the most reliable result among the three estimation methods. The root mean squared error of the calculated specific fuel consumption was 3.5 g/kWh, which is approximately 1.66 % error rate.

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Section: B Filtering Variation With CVmentioning

confidence: 99%

Efficiency Estimation of Synchronous Generators for Marine Applications and Verification With Shop Trial Data and Real Ship Operation Data

2020

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“…Fuel efficiency and NO x emissions were analyzed under cyclic transient loads for a turbocharged diesel engine by Yum et al [26]. Load profile consisting of a series of sinusoidal wave with a fixed amplitude at different frequencies and mean values were applied.…”

Section: Diesel Engine Exhaust Emissions During Transient Operationmentioning

confidence: 99%

Effect of Air Injection Technique on the Emission Characteristics of a CI Engine During Transient Operation

Saad,

Rummana

2024

Preprint

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The performance of turbocharged diesel engine deteriorates during transient operating conditions. Air injection is an effective technique in improving the transient response of the engine. However, the technique is not evaluated for exhaust emissions. To meet the stringent emission regulations, it is important to improve the emission performance of the diesel engine. Present study deals with the effect of air injection technique on exhaust emissions (CO, HC and NOx) under speed and load transients. Optimization of injection pressure based on orifice diameter is performed to ensure that the application of the technology comply with Euro VI standard. The results of the simulation were evaluated for Euro VI standard and 3 bar air injection at 10 mm orifice diameter was found to be the optimum injection pressure for speed transients which brings slight reduction in CO and HC emissions and significant reduction in NOxemissions. For load transients, Emissions werefound to be below Euro VI standard for all the injection pressures and orifice diameters.Quantification of emissions were done and 1.2 bar injection pressure at 10 mm orifice diameter was found to reduce all the three emissions as compared to no air injection.

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“…Many researchers use the engine steady-state fuel consumption map in their simulations. Yum et al 23 have shown that the steady-state map provides an estimation of fuel consumption with good accuracy, even without transient correction. The full displacement of the main pump is 125 cc/rev, and the full displacement of the motor is 140 cc/rev.…”

Section: Simulation Studymentioning

confidence: 99%

An optimal-pressure control strategy for hydrostatic wheel loader

Wang

Zhang

Sun

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part I:

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Mobile machines consume a large amount of fossil fuel each year; therefore, it is critical to reduce their fuel consumption. A wheel loader is a typical mobile machine of great research interest. Most compact wheel loaders are usually equipped with hydrostatic transmissions. To reduce the fuel consumption of the powertrain, a min-rpm strategy where the engine speed is maintained as low as possible is usually applied. It is a rule-based control strategy, however, cannot achieve minimum engine fuel consumption. Therefore, an optimal-pressure control strategy is proposed for hydrostatic wheel loaders, where the minimum fuel consumption is achieved by selecting optimal system pressure at each time step. To show the advantages of the proposed strategy, the powertrain operation and engine fuel consumption are compared with the min-rpm strategy through simulation studies. To further verify the effectiveness of the proposed strategy, comparisons are conducted using three loading cycles (30s, 57s and 90s). Results show the engine fuel savings in three loading cycles, with fuel saving up to 27% in the 90s loading cycle.

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An experimental investigation of the effects of cyclic transient loads on a turbocharged diesel engine

Cited by 18 publications

References 13 publications

Efficiency Estimation of Synchronous Generators for Marine Applications and Verification With Shop Trial Data and Real Ship Operation Data

Efficiency Estimation of Synchronous Generators for Marine Applications and Verification With Shop Trial Data and Real Ship Operation Data

Effect of Air Injection Technique on the Emission Characteristics of a CI Engine During Transient Operation

An optimal-pressure control strategy for hydrostatic wheel loader

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