Energy Consumption Analysis of Hybrid Continuously Variable Transmission Based on Electric Oil Pump

2018 ◽  
Vol 54 (1) ◽  
pp. 125
Author(s):  
Yunfeng LIU
2018 ◽  
Vol 67 (11) ◽  
pp. 10398-10410 ◽  
Author(s):  
Yunfeng Liu ◽  
Yunshan Zhou ◽  
Jiande Wang ◽  
Daohai Qu ◽  
Feitie Zhang

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2117
Author(s):  
Antti Ritari ◽  
Jari Vepsäläinen ◽  
Klaus Kivekäs ◽  
Kari Tammi ◽  
Heikki Laitinen

This study investigates the potential of improving the energy efficiency and reducing the lifecycle costs of electric city buses with multispeed gearboxes. A two-speed dual clutch gearbox and a continuously variable transmission were studied and compared to a reference fixed gear ratio powertrain. A novel two-level optimization model was introduced. The top level involves an exhaustive search algorithm and quasi-static vehicle dynamic model for optimizing the two-speed gearbox gear ratios, utilizing efficiency maps for the electric motor and the inverter. The second level is an integer programming model, which finds an optimal gear shifting policy subject to constraints on hysteresis and gear shifting induced losses. The model was applied with a standard driving cycle and additionally with three measured cycles acquired from a prototype battery electric city bus operating on a daily schedule on a suburban route in Espoo, Finland. The results showed that a two-speed gearbox reduced energy consumption by 2–3.2%, depending on the driving cycle characteristics. On the other hand, the continuously variable transmission was found to increase consumption by 1.9–4.0% due to large losses of the belt mechanism. It was concluded that the two-speed gearbox is a cost-effective investment for electric city buses characterized by operation profiles with frequent acceleration and braking events.


2019 ◽  
Vol 13 (8) ◽  
pp. 1089-1096 ◽  
Author(s):  
Yunfeng Liu ◽  
Yunshan Zhou ◽  
Daohai Qu ◽  
Feitie Zhang ◽  
Xianqi Bao

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1800
Author(s):  
Linfei Hou ◽  
Fengyu Zhou ◽  
Kiwan Kim ◽  
Liang Zhang

The four-wheeled Mecanum robot is widely used in various industries due to its maneuverability and strong load capacity, which is suitable for performing precise transportation tasks in a narrow environment. While the Mecanum wheel robot has mobility, it also consumes more energy than ordinary robots. The power consumed by the Mecanum wheel mobile robot varies enormously depending on their operating regimes and environments. Therefore, only knowing the working environment of the robot and the accurate power consumption model can we accurately predict the power consumption of the robot. In order to increase the applicable scenarios of energy consumption modeling for Mecanum wheel robots and improve the accuracy of energy consumption modeling, this paper focuses on various factors that affect the energy consumption of the Mecanum wheel robot, such as motor temperature, terrain, the center of gravity position, etc. The model is derived from the kinematic and kinetic model combined with electrical engineering and energy flow principles. The model has been simulated in MATLAB and experimentally validated with the four-wheeled Mecanum robot platform in our lab. Experimental results show that the accuracy of the model reached 95%. The results of energy consumption modeling can help robots save energy by helping them to perform rational path planning and task planning.


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