Technical review of opportunities to reduce the warm-up time of lubricant oil in a light-duty diesel engine

Battista, Davide Di; Vittorini, Diego; Fatigati, Fabio; Cipollone, Roberto

doi:10.1063/1.5138798

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…Among them, the cooling system is spotlighted because it has a great effect on fuel economy. During the cold start, the coolant fluid and lubricant oil are cold, therefore engines suffer higher friction and less efficient combustion resulting in higher fuel consumption and higher harmful emissions [6][7][8]. The viscosity of lubricant oil affects mechanical friction whereby at low temperature, the lubricant has high viscosity leading to increasing friction loss [9,10].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Jalal

Yusoff

Hasan

et al. 2021

JMES

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“…Focusing ICE thermal management, it directly concerns the thermal behavior of metal walls of cylinders and engine head [29], optimizing temperature to improve combustion [30], saving fuel and reduce emissions [31,32], avoiding after-boiling of the cooling fluid and mitigating knock [33,34]. Lubrication circuit has been also a main topic of investigation, due to its strict interactions with the engine coolant [35] and the fuel consumption benefits related to faster oil warm up [36], which implies lower oil viscosity at higher temperature and, so, low engine friction: split sump [37,38], heat-to-oil [39], thermal storage and variable flow lubrication [40,41] are the principal technologies available at the moment.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analyses to improve the design of engine coolant pumps

et al. 2020

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In this paper, an experimentally based procedure is presented to re-orient the design point of the pump in order to minimize the energy absorbed during the homologation cycle or during any real driving one. During it, in fact, every benefit on the pump’s efficiency is appreciated and produces fuel consumption and CO2 reduction. The procedure takes the advantage from a dynamic test bench for coolant pump, realized and engineered at University of L’Aquila. It has been linked to a model-based methodology, which evaluates, according to a specified vehicle’s mission profile, the speed and load variation of the engine propelling the vehicle, and, therefore, the pump speed. The knowledge of the engine cooling circuit for closed and fully opened thermostat allows the calculation of the flow rates and pressure delivered in each time instant of the drive cycle. The speed-flow rate-pressure delivered pump profile has been reproduced on the bench, and all the relevant quantities have been measured: an exact evaluation of the scatter of the efficiency of the pump, the instantaneous power and the overall energy absorbed have been obtained. Results show how the pump efficiency is far from its Best Efficiency Point. This conclusion invited the Authors to reorient the design pump considering an operating condition, which has a greater occurrence among all the operating points characteristic of a drive cycle. Four pumps have been designed following this approach, showing a sensible reduction of the energy absorbed: this represents a key point also for pump electrification.

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“…Widely considered for a thermoelectric generation [26,27], on board thermal storage usually involves phase change materials as the storage medium [28,29] or innovative layouts featuring nanostructured materials [30]. Way less attention has been tributed to its potential for direct feeding of thermal energy to the lubricant, even if preliminary numerical analysis [31] and experimental activities [32] invite to investigate that possibility. Furthermore, on board thermal storage provides the additional appealing advantage of decoupling the warm-up of the oil from the engine one, since the thermal energy would be readily available for transfer.…”

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confidence: 99%

Model Parameterized Assessment of a Thermal Storage Unit for Engine Oil Warm-up Improvement

Vittorini

Diomede

Battista

et al. 2022

J. Phys.: Conf. Ser.

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Despite the attention paid to components downsizing and down weighting, as well as to combustion control and exhaust gases after-treatment, friction reduction remains a promising area of intervention when it comes to the reduction of the environmental impact of internal combustion engines. The larger gain must be sought at cold starts, when the viscosity of the lubricant oil is higher and does not allow proper friction reduction. Moreover, during the first phases of engine operation, the metallic masses are not yet warm and do not contribute to the thermal stabilization of the lubricant. Further consequences of unfavourable thermal conditions are increased specific fuel consumption and pollutant emissions. Proper thermal management could effectively speed up the reaching of the design operating temperature of the oil and positively affect both homologation and on-road operation. The abundance of waste thermal energy during normal operation supports the option of on-board thermal storage for faster oil heating: water, heated by exhaust gases or residual thermal energy from previous use or by a combination of the two, can be stored inside a thermally insulated tank and serve as heating fluid in a dedicated water/oil heat exchanger. The paper presents a model based evaluation of this opportunity. The model has been validated thanks to an experimental activity carried out on an IVECO 3.0 L light-duty diesel engine, during a transient cycle (i.e., homologation one) reproduced on a dynamometric test bench. Different configurations in terms of hot storage volume, hot storage initial temperature, and the flow rate of the hot water during operation have been studied, producing optimized values for the hot water and storage unit design.

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Technical review of opportunities to reduce the warm-up time of lubricant oil in a light-duty diesel engine

Cited by 9 publications

References 34 publications

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

Experimental and numerical analyses to improve the design of engine coolant pumps

Model Parameterized Assessment of a Thermal Storage Unit for Engine Oil Warm-up Improvement

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