Engine Oil Aging Effects on Fuel Economy as Measured by the EPA FTP Vehicle Dynamometer Test in a GM Engine

In-cylinder flows such as tumble and swirl have an important role on the engine combustion efficiencies and emission formations. In particular, the tumble flow, which is dominant in-cylinder flow in current high performance gasoline engines, has an important effect on the fuel consumptions and exhaust emissions under part load conditions. Therefore, it is important to know the effect of the tumble ratio on the part load performance and optimize the tumble ratio of a gasoline engine for better fuel economy and exhaust emissions. First step in optimizing a tumble flow is to measure a tumble ratio accurately. In this research the tumble flow was measured, compared and correlated using three different measurement methods: steady flow rig, 2-Dimensional PIV, and 3-Dimensional PTV. Engine dynamometer test was performed to find out the effect of the tumble ratio on the part load performance. Dynamometer test results of high tumble ratio engine showed faster combustion speed, retarded MBT timing, higher exhaust emissions, and a better lean burn combustion stability. Lean limit of the baseline engine was expanded from A/F=18:1 to A/F=21:1 by increasing a tumble ratio using MTV.

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Effect of Engine Oil Viscosity on Low-Temperature Cranking, Starting, and Fuel Economy

The Relationship Between Engine Oil Viscosity and Engine Performance—Part V and Part VI ◽

10.1520/stp27335s ◽

2009 ◽

pp. 53-53-18

Author(s):

F Caracciolo ◽

ML McMillan

Keyword(s):

Low Temperature ◽

Fuel Economy ◽

Engine Oil ◽

Oil Viscosity

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Efficiency Improvement in Small Internal Combustion Engine Using Exhaust Heat Recovery System

Volume 8A: Heat Transfer and Thermal Engineering ◽

10.1115/imece2018-87565 ◽

2018 ◽

Author(s):

Shashank Rai ◽

Selin Arslan ◽

Badih Jawad

Keyword(s):

Fuel Economy ◽

Power Output ◽

Heat Recovery ◽

Internal Combustion Engines ◽

Internal Combustion ◽

Engine Oil ◽

Exhaust Heat ◽

Recovery System ◽

Heat Recovery System ◽

Exhaust Heat Recovery

Strict regulations are set up in various parts of the world with respect to vehicular emissions by their respective government bodies forcing automakers to design fuel-efficient vehicles. Fuel economy and carbon emission are the main factors affecting these regulations. In this competitive industry to make fuel efficient vehicles and reduce Green House Gas (GHG) emissions in internal combustions has led to various developments. Exhaust Heat Recovery System (EHRS) plays a vital role in improving powertrain efficiency. In this system, heat rejected by the engine is reused to heat the vehicle fluids faster (like engine coolant, engine oil, etc) also reducing harmful gases emitted. In internal combustion engines, generally only 25% of the fuel energy is converted into useful power output and approximately 40% of it is lost in exhaust heat. Certain studies show that by using the EHRS, the power output can be increased to 40% and the heat loss can be reduced to as much as 25%. The purpose of this study is to make use of this lost energy and convert most of it into useful energy. The thermodynamic properties and fuel consumed during the warmup period were analyzed to measure the improvement in the engine efficiency. The design was implemented on a Briggs and Stratton Junior 206cc engine. This system includes the use of heat exchangers. The main goal of this study is to develop a robust EHRS design and compare it with the baseline engine configuration to see the thermal and fuel economy improvement.

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