Factors Affecting Automotive Fuel Economy

1975 ◽  
Author(s):  
J. Dillard Murrell
Keyword(s):  
Fuel Economy ◽  
Factors Affecting ◽  
Automotive Fuel

On the estimation of optimal state-of-charge trajectory for plug-in hybrid electric buses using trip information

2021 ◽  
pp. 095440702110410
Author(s):  
Naser Sina ◽  
Vahid Esfahanian ◽  
Mohammad Reza Hairi Yazdi
Keyword(s):  
Fuel Economy ◽  
Dynamic Programming Algorithm ◽  
Optimal Solution ◽  
State Of Charge ◽  
Estimation Accuracy ◽  
Programming Algorithm ◽  
Factors Affecting ◽  
Optimal State ◽  
Energy Management Systems ◽  
Hybrid Electric

Plug-in hybrid electric buses are a viable solution to increase the fuel economy. In this framework, precise estimation of optimal state-of-charge trajectory along the upcoming driving cycle appears to play a pivotal role in the way to approach the globally optimal fuel economy. This paper aims to conduct a parametric study on the key factors affecting the estimation of optimal state-of-charge trajectory, including trip information availability and trip segment distance, and to provide a guideline for the design and implementation of predictive energy management systems. To accomplish this, the dynamic programming algorithm is employed to obtain the solution of optimal control problem for the sampled driving cycles in a particular bus route. A large database comprising of driving features of the cycles and the optimal solution is developed which then is used to construct a neural network based estimator for obtaining the optimal state-of-charge trajectory. The main results show promising performance of the proposed method with about 76% reduction in the root mean square error of the estimated trajectory comparing to the linear state-of-charge trajectory assumption. Moreover, the robustness of the estimator is verified through simulation and it is observed that appropriate choice of trip segment distance is vital to improve the estimation accuracy, especially in case of uncertain prediction of trip information.

Liquid Methane as a Motor Fuel

1949 ◽  
Vol 3 (1) ◽  
pp. 155-166 ◽  
Author(s):  
M. Pearce
Keyword(s):  
Fuel Economy ◽  
Chemical Engineering ◽  
Motor Fuel ◽  
Imperial College ◽  
Engine Test ◽  
Test Results ◽  
Fuel System ◽  
Long Distance ◽  
Factors Affecting ◽  
Liquid Methane

A comprehensive programme of work on the development of liquid methane as a motor fuel was started in 1938 in the Department of Chemical Engineering and Applied Chemistry, Imperial College. This paper describes some of the work concerned with the actual utilization on the vehicle. The factors affecting power output and fuel economy are discussed, and engine test results obtained at the laboratories of Messrs. Ricardo and Company, Engineers (1927), Ltd., are presented. Work on the development of a suitable vacuum-insulated fuel tank is described with particular reference to “neck losses”. The vehicle fuel system and its components as finally developed are described, and the results of long-distance service trials of a motor ‘bus with the normal and a higher compression ratio are given. A disadvantage of liquid methane with the fuel system used so far is the loss of fuel by evaporation; the paper ends with a description of fuel systems which enable this loss to be virtually eliminated.

Light Duty Automotive Fuel Economy-Trends through 1977

1976 ◽  
Author(s):  
J. D. Murrell ◽  
R. G. Pace ◽  
G. R. Service ◽  
D. M. Yeager
Keyword(s):  
Fuel Economy ◽  
Automotive Fuel ◽  
Light Duty

Automobile Fuel Economy and Greenhouse Gas Emissions Standards

2017 ◽  
Vol 1 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Grady Killeen ◽  
Arik Levinson
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Electric Vehicles ◽  
Fuel Economy ◽  
Environmental Benefits ◽  
Costs And Benefits ◽  
Gas Emissions ◽  
Automotive Fuel ◽  
History Of

In March 2017, EPA Administrator Scott Pruitt reopened an evaluation of the automotive fuel economy and greenhouse gas emissions standards that the EPA had finalized in January. This case provides a history of the rules, along with assessments of their costs and benefits. It addresses numerous debates, including the environmental benefits of the rules, the role of electric vehicles, whether the standards should be less strict for larger cars, and tradeoffs between fuel economy and safety.

Sign in / Sign up

Export Citation Format

Share Document