Optimized Design of the Lubrication System of Modern Combustion Engines

Haas, A. R. C.; Esch, Thomas; Fahl, E.; Kreuter, Peter; Pischinger, Franz

doi:10.4271/912407

Cited by 20 publications

(7 citation statements)

References 2 publications

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“…The test was executed by measuring the time required to fill a 200 cc burette with oil leaking from the pump 1 . The relationship between flow and pressure in case of laminar regime should be linear, while the measured leakage flow is nearly proportional to the square of the pressure and this behavior can only be justified by an increment of the clearance.…”

Section: Fig 8 External Leakage Flow As Function Of Pressurementioning

confidence: 99%

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Energy Consumption in ICE Lubricating Gear Pumps

Rundo¹

2010

SAE Technical Paper Series

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Scope of this work is the analysis of the energy consumed by lubricating gear pumps for automotive applications during a driving cycle. This paper presents the lumped parameter simulation model of gerotor lubricating pumps and the comparison between numerical outcomes and experimental results. The model evaluates the power required to drive the pump and the cumulative energy consumed in the driving cycle. The influence of temperature variations on leakage flows, viscous friction torque and lubricating circuit permeability is taken into account. The simulation model has been validated by means of a test rig for hydraulic pumps able to reproduce the typical speed, temperature and load profiles during a NEDC driving cycle. Experimental tests, performed on a crankshaft mounted pump for diesel engines, have confirmed a good matching with the simulation model predictions in terms of instantaneous quantities and overall energy consumption. The study allowed a proper screening of the power waste due to the pressure relief valve, the friction torque and the leakage losses during different stages of the engine warm-up. The outcomes from the simulation have brought to evidence that the main contribution to the consumed energy is due to the viscous friction torque, above all during the first urban cycle. Moreover, the influence of some parameters, such as the pressure setting of the relief valve and the temperature rate has been analyzed. Finally the model has been applied to an off-axis mounted gerotor pump with smaller gears diameters to quantify the improvement in power saving due to the reduction of viscous friction.

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Section: Fig 8 External Leakage Flow As Function Of Pressurementioning

confidence: 99%

“…It is known that friction represents a not negligible contribution to the effective pump torque. In references [1] and [2] new rotors geometries were proposed for improving mechanical efficiency. Authors claimed a relevant reduction of friction losses, but it is not clear in what operating condition such improvement was obtained.…”

Section: Introductionmentioning

confidence: 99%

Energy Consumption in ICE Lubricating Gear Pumps

Rundo¹

2010

SAE Technical Paper Series

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“…From the above calculation, it can be concluded that the oil pump displacement is proportional to Eccentricity distance [2].…”

Section: Van Pump Displacement Calculationmentioning

confidence: 99%

Two Types of Variable Displacement Oil Pump Development

OuYang

Cai

et al. 2012

Lecture Notes in Electrical Engineering

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Regulations in fuel consumption and emission become more and more strict, it is required to give more research on finding methods of saving energy and reducing emissions, also, reducing energy loss of engine attachments is an effective method. Oil pump play a key role in engine lubrication system, it provides power to make oil flow for lubrication and cooling of moving parts in engine. Due to discharge effect of the pressure relief valve in oil pump, thus, traditional oil pump loses a lot of energy as engine works in a high speed period. On the contrary, variable displacement oil pump has a certain effect on energy-saving by reducing oil pump displacement directly when an engine is running in a high speed period. This article gives research on the structural characters and energy-saving effect on both rotor type and vane type of variable displacement oil pump.

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“…The life test of the gearbox has also been conducted together to investigate the lubrication quality at the worst case, that is, the ''Hot Idle'' condition (idle speed and high oil temperature). 21 …”

Section: Optimal Design Of the Lubrication Systemmentioning

confidence: 99%

“…Based on the statement mentioned above, XFlow can provide a proprietary fully Lagrangian particlebased kinetic approach which dramatically reduces the time to solution for a given level of solution accuracy. 21 Moreover, the software just requires the target scale resolved for the geometry or the shapes, and the time-consuming manual labor work of meshing can be eliminated. Therefore, XFlow is particularly suitable for calculating transient flow rate through each outlet in the capillary lubrication network.…”

Section: Flow Field Analysis Of the Capillary Lubrication Network In mentioning

confidence: 99%

Optimized design of the flow network in the lubrication system for the heavy vehicle transmission

Jiang³

et al. 2017

Advances in Mechanical Engineering

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An accurate simulation model of the lubrication system is essential for early design of the heavy truck transmission. In this article, a detailed computational method for the flow network analysis of the lubrication circuit is developed based on the hydraulic theory, and the flow resistance through the oil pipes and orifices is also taken into consideration. Then, the Next Limit Technologies' XFlow, a potential new three-dimensional computational fluid dynamics software based on lattice Boltzmann method, is adopted to obtain the relationship between the oil delivery and the lubrication effect in the low-pressure capillary lubrication network of the rear auxiliary gearbox. To achieve the best overall lubricating performance of the flow network, the optimized design of the diameter for each oil supply orifice is determined by a detailed sensitivity analysis on the contribution of each parameter to the volumetric flow rate. The bench tests for the volumetric flow rate have been performed for validating the computation model by comparing the predicted volumetric flow rate through each oil supply bore with the experimental data at various pump speeds. The endurance tests have further conducted and the test results indicate a remarkable reduction in mechanical weariness when the best solution of the flow network design for the transmission lubrication system is adopted.

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Optimized Design of the Lubrication System of Modern Combustion Engines

Cited by 20 publications

References 2 publications

Energy Consumption in ICE Lubricating Gear Pumps

Energy Consumption in ICE Lubricating Gear Pumps

Two Types of Variable Displacement Oil Pump Development

Optimized design of the flow network in the lubrication system for the heavy vehicle transmission

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