International Journal of Environment (ISSN: 2186-0009)  

Efficient Eco-driving Strategies at Signalized Intersections Based on Engine Fuel Cut-off of a Vehicle
Md. Abdus Samad Kamal and Md. Tawhidul Islam Khan
In urban road networks, traffic flows at intersections are regulated by traffic lights or signs that distribute passing rights to vehicles coming from different directions, and thereby, ensure collision free intersection operation. However, steady driving of a vehicle is often interrupted by such red traffic signals at intersections. Avoiding aggressive braking to utilize kinetic energy of a vehicle before stopping it at a red signal is one of the rules for eco-driving that aims at minimizing fuel consumption and reducing CO2 emission. The eco-drive method can be made more efficient by maximizing the fuel-cut period of the engine during such stops. With high engine velocity, the fuel is not injected into the engine if the driver does not depress the throttle pedal of a vehicle. This paper presents a simple method to determine the desired deceleration strategy of an individual vehicle that minimizes the fuel consumption during stops. A simple experiment was conducted to determine the engine fuel cut-off period and the corresponding deceleration model of the vehicle. Based on the deceleration model, the optimal stopping strategy in terms of speed-distance map is constructed. This map can be used to train a driver for eco-driving, or to develop an on-board eco-driving assistance system specific to a vehicle. The proposed stopping strategy is numerically tested and the estimated fuel consumption of the vehicle is compared with traditional driving for an example case-study. Significant improvement in fuel consumption is confirmed from the test results.
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