Lost-Motion VVA Systems for Enabling Next Generation Diesel Engine Efficiency and After-Treatment Optimization

Schwoerer, John; Kumar, K. Ashok; Ruggiero, Brian; Swanbon, Bruce

doi:10.4271/2010-01-1189

Cited by 30 publications

(24 citation statements)

References 16 publications

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“…Models for the impact of EEVO on TOT and fuel consumption increase (equations (19) and (9), respectively) Table 2 for condition details). have been described and validated with data obtained from experiments.…”

Section: Eevo Impact On Other Operating Pointsmentioning

confidence: 99%

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Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

Roberts

Magee

Shaver

et al. 2014

International Journal of Engine Research

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In response to strict emissions regulations, engine manufacturers have implemented aftertreatment technologies to reduce the tailpipe emissions from diesel engines. The effectiveness of most of these systems is limited when exhaust temperatures are below 250°C. This is problematic during cold start and at low-load engine operation when the exhaust gas temperature is too low to keep the aftertreatment working effectively. The implementation of variable valve actuation strategies, including early exhaust valve opening, has been proposed as a means to elevate exhaust temperatures. Early exhaust valve opening results in hotter exhaust gas; however, more fueling is needed to maintain brake power output. This article outlines an analysis of the impact of early exhaust valve opening on exhaust temperature (measured at the turbine outlet) and the required fueling. An experimentally validated model is developed, which relates fueling increase with the timing of exhaust valve opening. This model is used to generate expressions for brake thermal efficiency and turbine out temperature as a function of exhaust valve opening. These expressions are used to evaluate the impact of early exhaust valve opening over the entire low-load operating space of a diesel engine. The model predicts an approximate 30°C-100°C increase in turbine out temperature at a given commanded exhaust valve opening of 90°b efore nominal, which is sufficient to raise many low-load operating conditions to exhaust temperatures above 250°C; however, the analysis also predicts penalties in brake thermal efficiency as large as 0.05 points.

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Section: Eevo Impact On Other Operating Pointsmentioning

confidence: 99%

“…TOT values were calculated using equation (19) and compared with the experimentally measured temperatures, as shown in Figure 26. This one-to-one comparison demonstrates a good correlation with some amount of over-prediction at condition 1.…”

Section: Tot Increase With Eevo Modelmentioning

confidence: 99%

Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

Roberts

Magee

Shaver

et al. 2014

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Jacobs Vehicle Systems Inc. also developed its own version of the lost-motion VVA system, with emphasis on diesel engine efficiency and after-treatment optimization [57]. It includes the capability of on-off control of secondary events for IEGR and engine braking, high load capacity for early exhaust opening and engine braking, and inherent protection against valve-to-piston contact.…”

Section: Lost-motion Vva (Lmvva)mentioning

confidence: 99%

Review of Advancement in Variable Valve Actuation of Internal Combustion Engines

Lou

Zhu

2020

Applied Sciences

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The increasing concerns of air pollution and energy usage led to the electrification of the vehicle powertrain system in recent years. On the other hand, internal combustion engines were the dominant vehicle power source for more than a century, and they will continue to be used in most vehicles for decades to come; thus, it is necessary to employ advanced technologies to replace traditional mechanical systems with mechatronic systems to meet the ever-increasing demand of continuously improving engine efficiency with reduced emissions, where engine intake and the exhaust valve system represent key subsystems that affect the engine combustion efficiency and emissions. This paper reviews variable engine valve systems, including hydraulic and electrical variable valve timing systems, hydraulic multistep lift systems, continuously variable lift and timing valve systems, lost-motion systems, and electro-magnetic, electro-hydraulic, and electro-pneumatic variable valve actuation systems.

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“…One recent method is to apply VVT on engine systems and increase the aftertreatment inlet exhaust gas temperature [16]. There is an ongoing research to define the positive effects of VVT on diesel engine exhaust temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of application of variable valve timing on the exhaust gas temperature improvement in a low-loaded diesel engine

Başaran

Özsoysal

2017

Applied Thermal Engineering

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Lost-Motion VVA Systems for Enabling Next Generation Diesel Engine Efficiency and After-Treatment Optimization

Cited by 30 publications

References 16 publications

Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

Review of Advancement in Variable Valve Actuation of Internal Combustion Engines

Effects of application of variable valve timing on the exhaust gas temperature improvement in a low-loaded diesel engine

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