Experimental Heat Flux Analysis of an Automotive Diesel Engine in Steady-State Operation and During Warm-Up

Donn, Christian; Zulehner, Wolfgang; Ghebru, Daniel; Spicher, Ulrich; Honzen, Matthias

doi:10.4271/2011-24-0067

Cited by 16 publications

(4 citation statements)

References 5 publications

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“…13 When the engine is warmed up in idling condition, the ratio of heat absorbed by coolant from cylinder head to engine block is basically kept at 2:1. 14 When the ambient temperature is low, the stability of idling speed can be improved by pre-injection; with the increasing of idling speed, the outlet temperature of engine coolant increases, which is conducive to the improving for system temperature of post-treatment. The exhaust advance angle can realize the emission reduction of pollutants such as NOx and micro particles when the idling speed increases.…”

Section: Introductionmentioning

confidence: 99%

Development of control strategy for fast idling condition of diesel engine based on target torque

Jian

Lin

Ren

et al. 2021

Advances in Mechanical Engineering

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This article puts forward the concept of fast idling condition. The comparative experiments of idling and fast idling warming up engine show that: during cold start, the warm-up of fast idling condition whose maximum speed is 1350 r/min is the most fuel-efficient, fuel-saving about 4.5%, time-saving about 32.5%; at normal temperature, warming up engine of fast idling condition does not save fuel. The warm-up experiments of fast idling condition that accelerations are different in the descent phase show that when the engine is cold, the smaller the acceleration in the descent phase of fast idling condition is, the more time and fuel are saved; at normal temperature, the bigger the acceleration in the descent phase of fast idling condition is, the better the fuel economy is. Therefore, it is inferred that the engine should be warmed up under fast idling condition when the engine is cold and idling condition is used to warm up engine at normal temperature. To sum up, when the engine is cold, the engine should be warmed up under the fast idling condition whose maximum speed is 1350 r/min; at normal temperature, it should be warmed up in idling condition to save fuel.

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Section: Introductionmentioning

confidence: 99%

Development of control strategy for fast idling condition of diesel engine based on target torque

Jian

Lin

Ren

et al. 2021

Advances in Mechanical Engineering

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“…The three EGR methods examined were as follows: a baseline HP EGR case, HP EGR with increased swirl and HP EGR under constant l conditions. Note that while FLAs on internal combustion engines are not new, with many examples available in the literature, [14][15][16][17][18][19][20][21][22][23] the application of FLA to EGR application methods is novel and the results of this work are expected to guide the development of future EGR strategy.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of exhaust gas recirculation techniques on a high-speed direct injection diesel engine using first law analysis

Papaioannou

Leach

Davy

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effects of different exhaust gas recirculation (EGR) strategies on engine efficiency and the resulting energy flows at two speed/load conditions (1500 r/min/6.8 bar net indicated mean effective pressure (nIMEP) and 1750 r/min/13.5 bar nIMEP) were studied using a first law analysis approach. The EGR strategies tested were as follows: cooled high-pressure exhaust gas recirculation (baseline), the application of exhaust gas recirculation with the swirl flap closed and the use of exhaust gas recirculation under constant λ conditions. The closed swirl flap exhaust gas recirculation strategy reduced brake efficiency under high load conditions and increased heat transfer to the coolant for both load cases. Soot and CO emissions increased at high load, however, with an increase in NOx relative to the baseline case. The constant λ exhaust gas recirculation strategy reduced brake efficiency under low load, as well as the heat flow to the coolant for both load cases. The constant λ exhaust gas recirculation strategy benefited smoke emissions and increased combustion exhaust gas recirculation tolerance, albeit with a penalty in NOx emission.

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“…A lot of researchers have developed a numerical model for the global energy balance, 5,6 others presented it for the part and full load, 7 and others for the coolant circuit heat source only. 8 Some authors used the energy balance to assess the influence of the coolant and the intake air temperature on the engine efficiency. 5 Studies showed a detailed engine energy balance for both transient and steady-state phases, and highlighted the transient phase by dividing it into three different parts.…”

Section: Introductionmentioning

confidence: 99%

“…26 Many studies assessed the warm-up time gain behind this strategy. 8,16,27 Other studies proposed different strategies, such as exhaust heat recovery to warm-up the coolant or the oil, 22,28–30 and heat recovery from the EGR. 31 (The latter is defined in the Appendix, together with other notation.)…”

Section: Introductionmentioning

confidence: 99%

Evaluation of hot water storage strategy in internal combustion engine on different driving cycles using numerical simulations

Sara

Chalet

Cormerais³

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Since the main interest worldwide of green environment companies is to reduce pollutant emissions, the automotive industry is aiming to improve engine efficiency in order to reduce fuel consumption. Recently, studies have been shifted from upgrading the engine to the auxiliary systems attached to it. Thermal management is one of the successful fields that has shown promise in minimizing fuel consumption and reducing pollutant emissions. Throughout this work, a fourcylinder turbocharged diesel engine model was developed on GT-Power. Also, a thermal code has been developed in parallel on GT-Suite, in which the different parts of the coolant and lubricant circuits were modeled and calibrated to have the best agreement with the temperature profile of the two fluids in the system. Once the model was verified, hot coolant storage, a thermal management strategy, was applied to the system to assess the fuel consumption gain. The storage tank was located downstream the thermostat and upstream the radiator with three valves to control the coolant flow. The place was chosen to avoid negative impact on the cold start-up of the engine when the tank is at the ambient temperature. This strategy was applied on different driving cycles such as the NEDC, WLTC, CADC (urban and highway), and an in-house developed driving cycle. The ambient temperature was varied between 27°C to represent the coldest winter and 20°C. The results of this study summarize the ability of the hot coolant storage strategy in reducing the fuel consumption, and show the best driving cycle that needs to be applied on along with the influence of the different ambient temperatures.

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Experimental Heat Flux Analysis of an Automotive Diesel Engine in Steady-State Operation and During Warm-Up

Cited by 16 publications

References 5 publications

Development of control strategy for fast idling condition of diesel engine based on target torque

Development of control strategy for fast idling condition of diesel engine based on target torque

Evaluation of exhaust gas recirculation techniques on a high-speed direct injection diesel engine using first law analysis

Evaluation of hot water storage strategy in internal combustion engine on different driving cycles using numerical simulations

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