Effect of Station Heights on Energy Efficiency in a Metro Line Using Regenerative Braking

2019 ◽  
Author(s):  
M. F. Ozcan ◽  
S. Acikbas ◽  
S. Boynukalin ◽  
M. T. Soylemez
Keyword(s):  
Energy Efficiency ◽  
Regenerative Braking

Energy efficiency of hydraulic regenerative braking for an automobile hydraulic hybrid propulsion method

2019 ◽  
Vol 16 (13) ◽  
pp. 1046-1053 ◽  
Author(s):  
Wei Wu ◽  
Hui Liu ◽  
Junjie Zhou ◽  
Jibin Hu ◽  
Shihua Yuan
Keyword(s):  
Energy Efficiency ◽  
Regenerative Braking ◽  
Hybrid Propulsion ◽  
Hydraulic Hybrid

Regenerative braking algorithm for the electric vehicle with a seamless two-speed transmission

2018 ◽  
Vol 233 (4) ◽  
pp. 905-916 ◽  
Author(s):  
Zhou Zhou ◽  
Miaohua Huang
Keyword(s):  
Energy Efficiency ◽  
Electric Vehicle ◽  
Planetary Gear ◽  
Front Axle ◽  
Regenerative Braking ◽  
Motor Speed ◽  
Medium Level ◽  
Braking Torque ◽  
Upper Level ◽  
Braking Process

Better energy efficiency can be acquired by an appropriate shift operation during the regenerative braking process. In this work, an electric vehicle equipped with a two-speed automated transmission was used as the target vehicle. The transmission consists of two-stage planetary gear sets, a helical gear set, and two brakes. A hierarchical algorithm is presented for the electric vehicle. The upper-level algorithm was synthesized to assign braking force among regenerative braking, friction braking, front axle braking, and rear axle braking. Based on the motor external characteristic and ECE-R13 regulations, the work designed the dynamic distribution strategy for maximum use of regenerative braking. In the medium-level algorithm, the motor speed, efficiency characteristics, and assigned regenerative braking torque from upper-level algorithm were used to analyze the optimal shift points for improving regenerative efficiency. Then, a shift points table was drawn. In the lower-level algorithm, the linear control for the transmission was given to ensure seamless and smooth shifting. Finally, hardware-in-loop simulations were carried out. The results show that the proposed algorithm can improve performance in energy efficiency in the experimental braking events.

scholarly journals Feasibility of a Clutchless Dual-Shaft Hybrid Transmission System for Performance Applications

2016 ◽  
Author(s):  
Sahil Shah ◽  
Victor Prost ◽  
Zachary Eubanks ◽  
Paige Reiter ◽  
Daria Bondarchuk ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electric Motor ◽  
Combustion Engine ◽  
Regenerative Braking ◽  
Electric Transmission ◽  
High Acceleration ◽  
Viscous Losses ◽  
Hybrid Transmission ◽  
Reverse Gear ◽  
Viable Method

A novel hybrid-electric transmission concept was sought that yields higher acceleration and smoother gear-shifts compared to existing dual-clutch systems while improving the energy efficiency of the vehicle. After evaluating a range of strategies, the elimination of the clutch was identified as a viable method for reducing the vehicle’s effective inertia and viscous losses. The proposed architecture implements a single electric motor, and two separate shafts for odd and even gears, to replace the functions of a clutch. High acceleration rates can be achieved using the electric motor when launching the vehicle. Furthermore, the torque from the electric motor (EM) and internal combustion engine (ICE) can be simultaneously delivered through the two shafts to sustain this high acceleration. A 0 to 100 km/hr time of 3.18 s was simulated for a 1600 kg vehicle using a 180 kW EM and 425 kW ICE. In addition, the EM can be used to match the speeds of consecutive gears on the two shafts to reduce jerk while shifting. Shift durations were found to vary between 0.2 and 0.9 s using this strategy. Other benefits include regenerative braking and the removal of the reverse gear since the EM can rotate in either direction. It was also found that the vehicle can be operated on only electric power in urban settings — represented by the NEDC driving cycle — if the battery is recharged through regenerative braking, and by the ICE the vehicle is stopped.

Analysis of downshift’s improvement to energy efficiency of an electric vehicle during regenerative braking

2016 ◽  
Vol 176 ◽  
pp. 125-137 ◽  
Author(s):  
Liang Li ◽  
Xujian Li ◽  
Xiangyu Wang ◽  
Jian Song ◽  
Kai He ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electric Vehicle ◽  
Regenerative Braking

Development of Parallel Regenerative Braking Controller

2011 ◽  
Vol 219-220 ◽  
pp. 1161-1164
Author(s):  
Jing Ming Zhang ◽  
Wei Nan Du ◽  
Xiu Hu Wang
Keyword(s):  
Energy Efficiency ◽  
Control Strategy ◽  
Energy Recovery ◽  
Regenerative Braking ◽  
Recovery Efficiency ◽  
Hardware In The Loop ◽  
Braking System ◽  
Driving Condition ◽  
Braking Force ◽  
Braking Control

In order to improve hybrid electric vehicle’s energy efficiency, this paper did a research on the regenerative braking system of HEV. In this paper we proposed a new parallel regenerative braking control strategy for HEV and analyzed its characteristics in details. Based on theoretical analysis, we developed a parallel regenerative braking controller for a certain HEV, and built hardware-in-the-loop simulation system to test the controller’s performance. We chose the UDDS driving condition for simulation, and the result shows that the regenerative braking controller we developed is effective and reliable. The controller fulfills the parallel regenerative braking control strategy and distributes the braking force accurately. The energy recovery efficiency reaches 16.7%, which significantly improves the vehicle’s energy efficiency.

scholarly journals METHOD OF EVALUATION OF RECEIVABLY BRAKING EFFICIENCY FOR ELEMENTARY SIMPLIFIED MOVEMENT CYCLE

2021 ◽  
Vol 1 (48) ◽  
pp. 37-43
Author(s):  
Budnichenko V ◽  
◽  
Gordienko M ◽  
Keyword(s):  
Mathematical Model ◽  
Energy Efficiency ◽  
Energy Consumption ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Regenerative Braking ◽  
Vehicle Speed ◽  
Traction Unit ◽  
Electric Traction ◽  
Method Of Evaluation

The article analyzes the elementary simplified cycle of a vehicle with an electric motor during its acceleration and regenerative braking, the dependence of specific energy consumption on vehicle speed and the equation of specific energy consumption, to develop a mathematical model that characterizes the energy efficiency of a vehicle with traction traffic conditions on an elementary simplified cycle. The object of the study is the process of determining the specific energy consumption during the movement of a vehicle with an electric traction unit. The aim of the article is to develop a mathematical model that characterizes the energy efficiency of wheeled and rail vehicles with electric traction. Research methods - information-analytical. According to the results of the study, a method for evaluating the effectiveness of regenerative braking for an elementary simplified motion cycle is obtained. KEY WORDS: ELECTRIC TRACTION INSTALLATION, ENERGY EFFICIENCY, ENERGY CONSUMPTION, RECOVERATIVE INHIBITION, ELECTRODYNAMIC HALAMENE GALAMATE, MATHEMATICAL MODEL

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