Water Jacket Spacer for Improvement of Cylinder Bore Temperature Distribution

Matsutani, Takashi; Nakada, Takanori; Shinpo, Yoshikazu; Hatano, Makoto

doi:10.4271/2005-01-1156

Cited by 12 publications

(3 citation statements)

References 1 publication

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“…The oil temperature affected the camshaft friction, crankshaft friction and the oil pump friction. The coolant temperature affected the engine cylinder wall friction which was consistence with previous studies [26,27]. The friction reduced 0.15% at the maximum bypass electric water pump speed increase.…”

Section: Oil Temperature Engine Friction and Fuel Consumptionsupporting

confidence: 85%

Simulation of bypass electric water pump to reduce the engine warm-up time

Jalal

Yusoff

Hasan

et al. 2021

JMES

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There are several strategies have been developed in the automotive cooling system to improve engine thermal management. Basically, these designs use controllable actuators and mechatronic components such as electric water pump, controllable thermostat, and controllable electric fan to improve engine temperature control on most operating ranges. Most of the strategies are complicated and costly. This paper introduced a different approach to improve coolant temperature warm-up during cold start. The new strategy was by promoting a higher coolant flow rate inside the engine block by just installing an electric water pump in the bypass hose. The new approach’s cold start performance was studied using GT-SUITE on a transient model, complete with finite-element of engine block design, lubrication system, components friction model, engine with combustion model and vehicle system. The proposed strategy clearly showed faster coolant temperature increase (18 seconds faster compared to the conventional cooling system). The strategy not only increase the coolant temperature faster, but also increases the oil temperature faster, lower Friction Mean Effective Pressure (FMEP), and lower fuel consumption at certain condition during the warm-up period.

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Section: Oil Temperature Engine Friction and Fuel Consumptionsupporting

confidence: 85%

Simulation of bypass electric water pump to reduce the engine warm-up time

Jalal

Yusoff

Hasan

et al. 2021

JMES

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“…Piston assembly friction is the highest friction component in an engine, contributing between 30% and 40% of the overall engine friction losses [9]. This suggests that reducing the piston assembly friction is a good way to improve engine efficiency which can be achieved through thermal management [1].…”

Section: A Combustion Wall Temperature Effectsmentioning

confidence: 99%

SI engine combustion wall thermal management potential without the presence of control limitation

Jalal

Steffen

Williams

2014

2014 UKACC International Conference on Control (CONTROL)

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Tight future CO 2 emission targets have encouraged extensive research in options for improving internal combustion engine efficiency. Amongst those, engine thermal management is a promising area to improve fuel economy, engine power and even reliability. Earlier studies have shown that engine thermal management was not just protecting engine from overheating but it also can improve engine performance, fuel consumption and even emissions. However, the effects and limits of thermal management are highly complex, and a better understanding is required to reach the full potential.The aim of this paper is to demonstrate the potential of manipulating combustion wall temperature for improving engine efficiency. A 1D numerical model of a 2.2L natural aspirated engine was developed using GT-Suite software for this purpose. The spark timing and fuelling in the engine model was also recalibrated to explore the indirect influence of thermal management influence on engine efficiency. The model assumes that the optimal temperature can be achieved at all times, ignoring some of the control implementation issues for now.The results show that optimized combustion wall temperature produces significant fuel consumption improvements at low to medium engine speed at both low and high load. The comparison with conventional temperature control was made using 7 legislated and academic test cycles. The highest fuel economy improvement of about 4% was recorded in urban test cycles. A smaller improvement of more than 2% was found for motorway driving. The results are due to improved combustion and lubrication only, not including reduced hydraulic losses.

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“…Mesh model is shown in the Fig.2. Grid number is about 1,600,000, which are mainly made up of Hex cells as well as a small number of Pyramid cells and Prism cells [3,4]. …”

Section: A Mesh Generationmentioning

confidence: 99%

Optimization Design for Water Jacket of 4G24 Gasoline Engine

Zhang

Gao

et al. 2011

2011 Asia-Pacific Power and Energy Engineering Conference

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Use CFD (Computational Fluid Dynamics) technique to simulate the water jacket of 4G24 gasoline engine is an effective way to look into the internal flow status of the water jacket. After calculation analysis, it is found that part of regional flow rate is too low in the cylinder head and block water jacket, where is easy to form dead areas. The HTC (Heat Transfer Coefficient) on cylinder block intake side is low, and needs to be improved. Total pressure loss of water jacket surface is too large. Based on above calculation analysis, as optimized schemes, place a baffle at the inlet in front of the cylinder, add some holes on the top of cylinder block by use of clear sands holes to guide water from cylinder block to cylinder head and form better water flow lines. After optimization, dead areas were eliminated, heat transfer effect of cylinder block intake side is improved. Total pressure loss of water jacket surface is basically unchanged or slightly increased. By comparing some optimized schemes, place a baffle at inlet is found to be the best one.

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Water Jacket Spacer for Improvement of Cylinder Bore Temperature Distribution

Cited by 12 publications

References 1 publication

Simulation of bypass electric water pump to reduce the engine warm-up time

Simulation of bypass electric water pump to reduce the engine warm-up time

SI engine combustion wall thermal management potential without the presence of control limitation

Optimization Design for Water Jacket of 4G24 Gasoline Engine

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