Investigation of engine's thermal management based on the characteristics of a map-controlled thermostat

Basir, Hamed; Hosseini, Seyed Amirali; Nasrollahnezhad, Saeed; Jahangiri, Ali; Rosen, Marc A.

doi:10.1016/j.icheatmasstransfer.2022.106156

Cited by 9 publications

(6 citation statements)

References 54 publications

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“…As a result, the engine's fuel consumption decreases. According to the results presented in work [3], using a modern electronic thermostat instead of a conventional mechanical one resulted in reducing fuel consumption by 1.7%. The article [16] shows that the use of such thermostat significantly reduces the emission of harmful components (hydrocarbons, carbon monoxide, particulate matter) and greenhouse gases (CO2) in the exhaust gases of light diesel vehicles.…”

Section: Introductionmentioning

confidence: 97%

“…A significant amount, around 22% to 35%, of the energy supplied to the engine with the fuel is lost in engine cooling, mainly through the cooling system [15,23]. The cooling system directly influences engine service life, efficiency, fuel consumption, and emissions [3,12,24]. Work is underway to improve this system through the use of additional electrical and electronic systems: sensors, control units, electric servomotor actuators, smart thermostats or electric coolant pumps [1,3,16,21,24].…”

Section: Introductionmentioning

confidence: 99%

“…The cooling system directly influences engine service life, efficiency, fuel consumption, and emissions [3,12,24]. Work is underway to improve this system through the use of additional electrical and electronic systems: sensors, control units, electric servomotor actuators, smart thermostats or electric coolant pumps [1,3,16,21,24].…”

Section: Introductionmentioning

confidence: 99%

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Diagnosing the thermostat using vehicle on-board diagnostic (OBD) data

Witaszek,

Witaszek

2023

Diagnostyka

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The thermostat is a crucial component of a car's internal combustion engine's cooling system. Failure of the thermostat can result in undercooling or overheating of the engine. Undercooling may increase wear of engine components due to poor lubrication and lead to higher fuel consumption. Conversely, overheating can damage the engine. The engine coolant temperature is one of the fundamental parameters for the proper functioning of the engine. The vehicle's onboard diagnostics system was unable to detect the malfunction of the thermostat. As a consequence, fuel consumption increased, which was especially noticeable in winter. This paper evaluates the possibility of carrying out thermostat diagnostics using data obtained from the OBD system through a diagnostic interface ELM327, which is connected to the OBD-II connector and interfaced with Torque Pro software on a smartphone. Analysis of the data confirmed that the proposed diagnostic method was appropriate. Furthermore, the impact of the thermostat malfunction on different factors such as coolant temperature, cold engine warm-up time, parameters characterising thermostat cycling, and fuel consumption of the car were studied. It was found that, apart from the already mentioned decrease in coolant temperature, the thermostat hysteresis also decreased and the thermostat cycle time increased.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Diagnosing the thermostat using vehicle on-board diagnostic (OBD) data

Witaszek,

Witaszek

2023

Diagnostyka

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“…An extensive literature deals with engine thermal management as a promising option for obtaining reduced emissions and lower fuel consumption via a faster thermal stabilization of the engine [10,11]. Wide margins for enhanced engine performance are associated with a shorter warm up time of the lubricant oil [12,13,14]: a higher temperature of the lubricant is associated with lower viscosity and higher mechanical and organic efficiencies due to lower friction mean effective pressure (FMEP), particularly during engine cold states, when both the power unit and the aftertreatment line provide poor performance [15,16]. In normal conditions, the lube oil heats up by direct contact with metallic parts of the engine.…”

mentioning

confidence: 99%

“…Moreover, any attempt to re-configure the lubricant thermal dynamics in order to meet predefined goals in terms of warm-up time needs to cope with the impossibility to decouple the thermal dynamics of oil and engine coolant. Many options are available for improving the thermal management of the lubricant, ranging from the replacement of the mechanical pump with an electric pump for coolant circulation [19,20], to the use of a map-controlled thermostat [21,22]. The use of waste heat from exhaust gases as the thermal source to heat the lubricant has been discussed [23,24] as well as the reduction of oil mass being circulated during the cold states of the engine to reduce the warm-up time, by splitting the oil sump volume into distinct chambers [15,25].…”

mentioning

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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