Novel regenerative braking method for transient torsional oscillation suppression of planetary-gear electrical powertrain

2022 ◽  
Vol 163 ◽  
pp. 108187
Author(s):  
Feng Wang ◽  
Peng Ye ◽  
Xing Xu ◽  
Yingfeng Cai ◽  
Shaoyong Ni ◽  
...  
Keyword(s):  
Torsional Oscillation ◽  
Planetary Gear ◽  
Regenerative Braking ◽  
Oscillation Suppression

A New Powertrain System for Electric Hybrid Vehicles

2014 ◽  
Vol 577 ◽  
pp. 408-411
Author(s):  
Ren Guang Wang ◽  
Ming Jun Zhang ◽  
Chuan Long Shi
Keyword(s):  
Electric Vehicle ◽  
Electric Motor ◽  
Planetary Gear ◽  
Hybrid Vehicles ◽  
Regenerative Braking ◽  
Power Train ◽  
Powertrain System ◽  
Electric Driving ◽  
Left And Right ◽  
Different Parts

A new powertrain system was developed for electric vehicle driving application with adoption of one electric motor and one set of planetary gear set. With the control of fork, the sleeve of synchronizer can mesh two different parts on the left and right side; the system can provide pure electric driving, hybrid driving and regenerative braking operation modes to meet vehicle practical conditions. It can reduce both power train structure size and cost with fewer parts.

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.

New Powertrain Development for Electric Hybrid Vehicles

2014 ◽  
Vol 654 ◽  
pp. 217-220
Author(s):  
Ren Guang Wang ◽  
Ming Jun Zhang ◽  
Chuan Long Shi
Keyword(s):  
Electric Motor ◽  
Lower Cost ◽  
Planetary Gear ◽  
High Energy ◽  
Hybrid Vehicles ◽  
Regenerative Braking ◽  
Operation Modes ◽  
Powertrain System ◽  
Electric Driving ◽  
New Type

A new type of powertrain system was developed for electric hybrid vehicles. It is mainly composed of engine, first electric motor, first shaft, synchronizer mechanism, second electric motor, planetary gear set and second shaft. The adoption of one planetary gear set and synchronizer mechanism make it can be operated in four different operation modes with high energy efficiency and lower cost, its four operation modes are pure electric driving, hybrid driving, independent engine driving and regenerative braking. These four operation modes can fit the vehicle practical conditions according to order from the control system.

Spiral spring and planetary gear based regenerative braking system design for bicycles

2021 ◽  
Author(s):  
Amit Khokhri ◽  
Sachit Agarwal ◽  
Shashwat Salil Yashwardhan ◽  
Bikash Routh
Keyword(s):  
System Design ◽  
Planetary Gear ◽  
Regenerative Braking ◽  
Braking System ◽  
Spiral Spring

Mode Analysis of Power-Split Hybrid Electric Vehicle

2013 ◽  
Vol 791-793 ◽  
pp. 1807-1810
Author(s):  
Qing Nian Wang ◽  
Wen Wang ◽  
Peng Yu Wang ◽  
Feng Li
Keyword(s):  
Hybrid Electric Vehicle ◽  
Hybrid Electric Vehicles ◽  
Maximum Output Power ◽  
Planetary Gear ◽  
Mode Analysis ◽  
Regenerative Braking ◽  
Maximum Output ◽  
Vehicle Speed ◽  
Power Mode ◽  
Hybrid Electric

EVT transmission in Planetary Gear Hybrid Electric Vehicles makes it available that the engine works on the optimal curves; yet because of the speed limitation of motor MG1, the maximum output power of the engine is a function of vehicle speed. The maximum traction and regenerative braking power is also a function of vehicle speed. Based on this, the vehicle drive modes consist of EV mode, economy mode and power mode, and braking modes include the regenerative braking mode and electromechanical braking mode.

Cooperative Brake Control Strategy for Electric Vehicle Equipped With a Two-Speed Uninterrupted Mechanical Transmission

2017 ◽  
Author(s):  
Yuzhuo Tai ◽  
Jian Song ◽  
Liangyao Yu ◽  
Shengnan Fang ◽  
Truong Sinh Nguyen
Keyword(s):  
Electric Vehicle ◽  
Urban Areas ◽  
Cooperative Control ◽  
Fuel Efficiency ◽  
Planetary Gear ◽  
Regenerative Braking ◽  
Mechanical Transmission ◽  
Lagrange Equations ◽  
Braking System ◽  
Dynamic Simulation Model

Regenerative braking of EV (electric vehicle) can enhance fuel efficiency to a great extent in urban areas. In addition, transmission plays a great role on the vehicle fuel economy and comfort and there are some research focus on the multi-speed transmission on EV. However, only limited number of scholars discussed about the influence of multi-speed transmission system on regenerative braking system. This paper focus on the effects of Electric Vehicle equipped with a Two-speed Uninterrupted Mechanical Transmission., which consist of a set of planetary gear, band brake and friction clutch. The transmission is capable of achieving seamless downshift which indicates that it can still transfer torque while downshifting. At the same time, as traction interruption of shift exerted an influence on the comfort during brake, this article put forward with a cooperative control algorithm considering the real response of electrohydraulic braking system in order to compensate the traction interruption and established an dynamic simulation model to testify the algorithm. The transmission dynamic model is developed by utilizing Euler-Lagrange equations to derive the motion while the other models are some simplified models. The whole model is applied by using the SimDriveline library of the MATLAB/Simulink. The simulation results of EV which commit a downshift while brake and the EV keep the gear are compared at the last demonstrate that the downshift strategy can save more energy without excessive oscillations.

Helicopter main reduction planetary gear fault diagnosis method based on SVDD

2020 ◽  
Vol 64 (1-4) ◽  
pp. 137-145
Author(s):  
Yubin Xia ◽  
Dakai Liang ◽  
Guo Zheng ◽  
Jingling Wang ◽  
Jie Zeng
Keyword(s):  
Fault Diagnosis ◽  
Planetary Gear ◽  
Gaussian Kernel ◽  
Support Vector ◽  
Support Vector Data Description ◽  
Vector Data ◽  
Energy Characteristics ◽  
Gear Fault ◽  
Channel Information ◽  
Diagnosis Method

Aiming at the irregularity of the fault characteristics of the helicopter main reducer planetary gear, a fault diagnosis method based on support vector data description (SVDD) is proposed. The working condition of the helicopter is complex and changeable, and the fault characteristics of the planetary gear also show irregularity with the change of working conditions. It is impossible to diagnose the fault by the regularity of a single fault feature; so a method of SVDD based on Gaussian kernel function is used. By connecting the energy characteristics and fault characteristics of the helicopter main reducer running state signal and performing vector quantization, the planetary gear of the helicopter main reducer is characterized, and simultaneously couple the multi-channel information, which can accurately characterize the operational state of the planetary gear’s state.

Fore-Aft Forces in Tire-Wheel Assemblies Generated by Unbalances and the Influence of Balancing

1991 ◽  
Vol 19 (3) ◽  
pp. 142-162 ◽  
Author(s):  
D. S. Stutts ◽  
W. Soedel ◽  
S. K. Jha
Keyword(s):  
Mathematical Model ◽  
Elastic Foundation ◽  
Torsional Oscillation ◽  
Vertical Direction ◽  
Torsional Stiffness ◽  
Rolling Motion ◽  
Vertical Force ◽  
Horizontal Force ◽  
Wheel Rim ◽  
Open Question

Abstract When measuring bearing forces of the tire-wheel assembly during drum tests, it was found that beyond certain speeds, the horizontal force variations or so-called fore-aft forces were larger than the force variations in the vertical direction. The explanation of this phenomenon is still somewhat an open question. One of the hypothetical models argues in favor of torsional oscillations caused by a changing rolling radius. But it appears that there is a simpler answer. In this paper, a mathematical model of a tire consisting of a rigid tread ring connected to a freely rotating wheel or hub through an elastic foundation which has radial and torsional stiffness was developed. This model shows that an unbalanced mass on the tread ring will cause an oscillatory rolling motion of the tread ring on the drum which is superimposed on the nominal rolling. This will indeed result in larger fore-aft than vertical force variations beyond certain speeds, which are a function of run-out. The rolling motion is in a certain sense a torsional oscillation, but postulation of a changing rolling radius is not necessary for its creation. The model also shows the limitation on balancing the tire-wheel assembly at the wheel rim if the unbalance occurs at the tread band.

Sign in / Sign up

Export Citation Format

Share Document