An investigation of multiple spark discharge using multi-coil ignition system for improving thermal efficiency of lean SI engine operation

D Jung, N Iida - Applied energy, 2018 - Elsevier
Lean spark ignition (SI) engine operation can provide improvement of the thermal efficiency
relative to that of stoichiometric SI operation. However, the cycle-to-cycle variations of SI …

Energy-saving cost-effectiveness analysis of improving engine thermal efficiency and extending all-electric range methods for plug-in hybrid electric vehicles

X Liu, F Zhao, Z Liu - Energy Conversion and Management, 2022 - Elsevier
Improving the engine peak thermal efficiency (Method 1) and extending PHEV'all-electric
range (Method 2) are the main methods to improve the fuel economy of PHEVs after the …

Experiments and simulations of a lean-boost spark ignition engine for thermal efficiency improvement

S Ratnak, J Kusaka, Y Daisho, K Yoshimura… - … International Journal of …, 2016 - JSTOR
Primary work is to investigate premixed laminar flame propagation in a constant volume
chamber of iso-octane/air combustion. Experimental and numerical results are investigated …

0D/1D turbulent combustion model assessment from an ultra-lean spark ignition engine

R Sok, K Yamaguchi, J Kusaka - 2019 - sae.org
This paper focuses on an assessment of predictive combustion model using a 0D/1D
simulation tool under high load, different excess air ratio λ, and different combustion …

Thermal efficiency improvement of a lean-boosted spark ignition engine by multidimensional simulation with detailed chemical kinetics

R Sok, J Kusaka, Y Daisho, K Yoshimura… - International Journal of …, 2015 - jstage.jst.go.jp
This paper aims to improve thermal efficiency of spark ignition engine by numerical
calculation with detailed chemistry. Experimental results from a four-stroke-single-cylinder …

Experimental investigation of direct fuel injection into low-oxygen recompression interval in a homogenous charge compression ignition engine

R Sok, J Kusaka - Journal of Energy Resources …, 2022 - asmedigitalcollection.asme.org
This work analyzed measured data from a single-cylinder engine operated under the
gasoline direction injection homogenous charge compression ignition (GDI-HCCI) mode …

Numerical Methods on VVA and VCR Concepts for Fuel Economy Improvement of a Commercial CNG Truck

R Sok, K Takeuchi, K Yamaguchi, J Kusaka - 2020 - sae.org
Natural gas has been used in spark-ignition (SI) engines of natural gas vehicles (NGVs) due
to its resource availability and stable price compared to gasoline. It has the potential to …

Validation of Gasoline Surrogates Through Thermodynamic Analysis of Spark-Ignition Engine

V Patil, P Singh, S Sonage… - Journal of …, 2023 - asmedigitalcollection.asme.org
The investigation aims to evaluate the impacts of commercial gasoline and gasoline
surrogates on energy and exergy efficiencies in a spark-ignition (SI) engine. In this …

[PDF][PDF] A Modeling Study on Fuel Consumption Improvement of a Light-Duty CNG Truck Equipped With a Hybrid Powertrain

R Sok, J Kusaka, H Nakashima, M Akaike - ASTFE Digital Library, 2021 - researchgate.net
Increasing the driving ranges of compressed natural gas (CNG) trucks is also one solution to
promote an alternative and green fuel. One major issue is that the trucks have short-driving …

Thermoelectric Exhaust Heat Recovery to Maximize Brake Thermal Efficiency of Advanced Diesel Engines: Modeling and Baseline Analysis

R Sok, J Kusaka - Internal Combustion Engine …, 2022 - asmedigitalcollection.asme.org
This work demonstrates the enhancement of brake thermal efficiency (BTE) of an advanced,
turbocharged, production-intent 2.2 L diesel engine with a thermoelectric waste heat …