Alternative Crankshaft Mechanisms and Kinetic Energy Recovery Systems for Improved Fuel Economy of Light Duty Vehicles

2011 ◽  
Author(s):  
Alberto Boretti ◽  
Houshsng Masudi ◽  
Joseph Scalzo
Keyword(s):  
Kinetic Energy ◽  
Fuel Economy ◽  
Energy Recovery ◽  
Light Duty ◽  
Light Duty Vehicles

scholarly journals Drive cycle simulation of high efficiency combustions on fuel economy and exhaust properties in light-duty vehicles

2015 ◽  
Vol 157 ◽  
pp. 762-776 ◽  
Author(s):  
Zhiming Gao ◽  
Scott J. Curran ◽  
James E. Parks ◽  
David E. Smith ◽  
Robert M. Wagner ◽  
...  
Keyword(s):  
Fuel Economy ◽  
High Efficiency ◽  
Drive Cycle ◽  
Cycle Simulation ◽  
Light Duty ◽  
Light Duty Vehicles

Experimental Investigation of Hydraulic-Pneumatic Regenerative Braking System

2015 ◽  
Author(s):  
A. G. Agwu Nnanna ◽  
Erik Rolfs ◽  
James Taylor ◽  
Karla Ariadny Freitas Ferreira
Keyword(s):  
Experimental Investigation ◽  
Kinetic Energy ◽  
Power Output ◽  
Energy Recovery ◽  
Scale Model ◽  
Regenerative Braking ◽  
Gear Pump ◽  
Braking System ◽  
Light Duty ◽  
Overall Efficiency

Design and development of energy efficient vehicles is of paramount importance to the automobile industry. Energy efficiency can be enhanced through recovery of the kinetic energy lost in the form of waste heat during braking. The kinetic energy could be converted into a reusable energy source and aid in acceleration, hence the braking system would contribute to improving the overall efficiency of a vehicle. Hydraulic-Pneumatic Regenerative Braking (HPRB) systems are a hybrid drive system that works in tandem with a vehicle’s engine and drivetrain to improve efficiency and fuel-economy. A HPRB system functions by recovering the energy typically lost to heat during vehicle braking, and storing this energy as a reusable source that can propel a vehicle from a stop. The major advantages of a HPRB system are that a vehicle would not require its engine to run during braking to stop, nor would the engine be required to accelerate the vehicle initially from a stop. The benefit realized by this system is an increase in fuel-efficiency, reduced vehicle emissions, and overall financial savings. An HPRB system aids in slowing a vehicle by creating a drag on the driveline as it recovers and stores energy during braking. Therefore, HPRB system operation reduces wear by minimizing the amount of work performed by the brake pads and rotors. An experimental investigation of Hydraulic-Pneumatic Regenerative Braking (HPRB) system was conducted to measure the system’s overall efficiency and available power output. The HPRB in this study is a 1/10th lab-scale model of a light-duty four wheel vehicle. The design/size was based on a 3500 lbs light-duty four wheel vehicle with an estimated passenger weight of 500 lbs. It was assumed that the vehicle can accelerate from 0–15 mph in 2 seconds. The aim of this work is to examine the effect of heat losses due to irreversibility on energy recovery. The experimental facility consisted of a hydraulic pump, two hydraulic-pneumatic accumulators, solenoid and relief valves, and data acquisition system. The HPRB system did not include any driveline components necessary to attach this system onto a vehicle’s chassis rather an electric motor was used to drive the pump and simulate the power input to the system from a spinning drive shaft. Pressure transducers, Hall effects sensor, and thermocouples were installed at suction and discharge sections of the hydraulic and pneumatic components to measure hydrodynamic and thermos-physical properties. The measured data were used to determine the system’s energy recovery and power delivery efficiency. Results showed that the HPRB system is capable of recovering 47% of the energy input to the system during charging, and 64% efficient in power output during discharging with an input and output of 0.33 and 0.21 horsepower respectively. Inefficiencies during operation were attributed to heat generation from the gear pump but especially due to the piston accumulator, where heat loss attributed to a 12% reduction in energy potential alone.

Assessing the Fuel Economy Potential of Light-Duty Vehicles

2001 ◽  
Author(s):  
Feng An ◽  
John Decicco ◽  
Marc Ross
Keyword(s):  
Fuel Economy ◽  
Light Duty ◽  
Light Duty Vehicles

Energy Efficiency, Fuel Economy, and Policy Implications

2005 ◽  
Vol 1941 (1) ◽  
pp. 8-17 ◽  
Author(s):  
Nicholas Lutsey ◽  
Daniel Sperling
Keyword(s):  
Energy Efficiency ◽  
Technological Innovation ◽  
Public Interest ◽  
Fuel Economy ◽  
The United States ◽  
Policy Implications ◽  
The Public ◽  
Light Duty ◽  
Consumption Energy ◽  
Light Duty Vehicles

In the past 20 years, the acceleration performance of light-duty vehicles in the United States has improved substantially while vehicles have gotten larger and heavier. Over the same period, fuel economy, measured as miles per gallon, has not improved. These data suggest that technological innovation in vehicles is not lagging but is not being used to improve vehicle fuel economy. This paper quantifies vehicle efficiency improvements in U.S. light-duty vehicles since 1975 as they relate to fuel consumption. Energy efficiency improvements have been strongly positive and relatively constant since 1975. The rapid rise in fuel economy in the late 1970s was due to a mix of efficiency improvements and downgrading of utility in the form of reduced size, power, and elimination of accessories and amenities (such as air conditioning). In contrast, since the mid-1980s, fuel economy has remained constant while the benefits of technological innovation were used to satisfy private desires (more power, size, and amenities), instead of the public interest (reduced greenhouse gas emissions and oil imports). An important policy question is how and to what extent future efficiency innovations might be directed to the public interest.

Synergistic engine-fuel technologies for light-duty vehicles: Fuel economy and Greenhouse Gas Emissions

2017 ◽  
Vol 208 ◽  
pp. 1538-1561 ◽  
Author(s):  
Kai Morganti ◽  
Marwan Al-Abdullah ◽  
Abdullah Alzubail ◽  
Gautam Kalghatgi ◽  
Yoann Viollet ◽  
...  
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Fuel Economy ◽  
Engine Fuel ◽  
Gas Emissions ◽  
Light Duty ◽  
Light Duty Vehicles

Fuel Economy Potential of Variable Compression Ratio for Light Duty Vehicles

2017 ◽  
Vol 10 (3) ◽  
pp. 817-831 ◽  
Author(s):  
Michael H. Shelby ◽  
Thomas G. Leone ◽  
Kevin D. Byrd ◽  
Frank K. Wong
Keyword(s):  
Compression Ratio ◽  
Fuel Economy ◽  
Variable Compression Ratio ◽  
Light Duty ◽  
Light Duty Vehicles ◽  
Variable Compression
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