Research on the Energy Efficiency Indicators of Transport Diesel Engines under Transient Operation Conditions

Sergejus Lebedevaspaulius,Rima Mickevicienė,Paulius Rapalis

doi:10.31217/p.32.2.8

Abstract

In this study, we have investigated the efficiency of transport diesel engines CAT3512B-HD in transient braking and acceleration modes in 2M62M locomotives. A comparative analysis of the diesel engine performance has been performed at speeds of power increase and braking ranging from 4–5 kW/s to 17–18 kW/s. A decrease in the fuel economy occurred, and the main reason for it (compared with the steady-state operating condition at qcycl = idem) has been found to be the deterioration of the mechanical efficiency coefficient due to the loss of the additional equipment kinetic energy of the engine. The efficiency decreased by 3–3.5% under power increase operations and by 10–14% in the braking modes. The original methodology for the evaluation of the diesel engine parameters registered by the engine control units (ECU) in the engine operating conditions, mathematical modelling application AVL BOOST, and analytical summaries in artificial neural networks (ANNs) have been used. The errors in the obtained results have been 5–8% at a determination coefficient of 0.97–0.99.

Highlights

The energy characteristics and optimization research of a diesel engine (DE) during operation are some of the most effective approaches for improving the efficiency, reliability, and ecological indicators
The transport DE operation often results in transient operation modes which are related to the energy efficiency deterioration [22, 36]
In the research on the transient modes, steady-state operation tests have been performed on a rheostat and an improved more accurate mathematic model of the CAT3512B-HD engine has been developed in the AVL BOOST programme

Summary

Introduction

The energy characteristics and optimization research of a diesel engine (DE) during operation are some of the most effective approaches for improving the efficiency, reliability, and ecological indicators. Numerous studies have been carried out in the area of DEs via experimental and mathematical modelling research, with an increased attention to transient operation modes [2, 11, 22, 25, 34, 35, 36]. The transport DE operation often results in transient operation modes which are related to the energy efficiency deterioration [22, 36]. The filling is either insufficient during the fuel portion increase or excessive during the fuel portion reduction. Both cases, i.e. lack or excess of air, have a detrimental effect on the engine efficiency

Methods

Results

Conclusion