A Novel Three-Planetary-Gear Power-Split Hybrid Powertrain for Tracked Vehicles

2018 ◽  
Author(s):  
Zhaobo Qin ◽  
Yugong Luo ◽  
Zhong Cao ◽  
Keqiang Li
Keyword(s):  
Planetary Gear ◽  
Hybrid Powertrain ◽  
Tracked Vehicles ◽  
Power Split

Automated Schematic Design of Power-Split Hybrid Vehicles With a Single Planetary Gear

2014 ◽  
Author(s):  
Toumadher Barhoumi ◽  
Dongsuk Kum
Keyword(s):  
Electric Vehicles ◽  
Design Methodology ◽  
Systematic Approach ◽  
Hybrid Electric Vehicles ◽  
Planetary Gear ◽  
Hybrid Vehicles ◽  
Relative Location ◽  
Hybrid Powertrain ◽  
Power Split ◽  
Toyota Prius

Most of the previous research in the field of power-split hybrid electric vehicles focused on the powertrain topology optimization. However, depicting a given or found topology in the form of schematic diagram, required for the advanced steps of vehicles’ design, has not yet been studied. In this paper, we propose a systematic approach to automatically generate all feasible stick diagrams for all twelve split-hybrid powertrain topologies with a single planetary gear (PG). The stick diagram is a simplified cartoon layout that schematically illustrates the connections, arrangements, and positions of the powertrain components. The proposed process is divided into three steps. First, we introduce the placement diagram, which specifies the position of the components with respect to the planetary gear. Secondly, for each placement diagrams, all positioning diagrams are generated where the relative location of each component is determined. The use of positioning diagrams guarantees dealing with all the possible arrangements. Lastly, the feasible stick diagrams are selected by filtering out infeasible ones from the entire pool of candidate stick diagrams using a set of feasibility rules. The proposed method is used for several topologies, such as Toyota Prius and GM Volt, and it is found that the patented stick diagrams are a subset of all the feasible stick diagrams. Therefore, one can systematically generate all the feasible stick diagrams for any given single PG powertrain topology using the proposed design methodology.

Optimal Design of Single-Mode Power-Split Hybrid Tracked Vehicles

2018 ◽  
Vol 140 (10) ◽  
Author(s):  
Zhaobo Qin ◽  
Yugong Luo ◽  
Keqiang Li ◽  
Huei Peng
Keyword(s):  
Optimal Design ◽  
Degrees Of Freedom ◽  
Single Mode ◽  
Topology Design ◽  
Hybrid Powertrain ◽  
Tracked Vehicles ◽  
Power Split ◽  
Skid Steering ◽  
Design Selection ◽  
Low Efficiency

Hybrid tracked vehicles are common in construction, agriculture, and military applications. Most use a series hybrid powertrain with large motors and operate at a relatively low efficiency. Although some researchers have proposed power-split powertrains, most of these would require an additional mechanism to achieve skid steering. To solve this problem and enhance drivability, a single-mode power-split hybrid powertrain for tracked vehicles with two outputs connected to the left and right tracks is proposed. The powertrain with three planetary gears (PGs) would then be able to control the torque on the two tracks independently and achieve skid steering. This powertrain has three degrees-of-freedom (DOF), allowing for control of the output torques and the engine speed independently from the vehicle running speed. All design candidates with three PGs are exhaustively searched by analyzing the dynamic characteristics and control to obtain the optimal design. Efficient topology design selection with parameter sizing and component sizing is accomplished using the enhanced progressive iteration approach to achieve better fuel economy using downsized components.

Rapid Optimization of Multiple-Planetary-Gear Power-Split Hybrid Powertrains

2015 ◽  
Author(s):  
Weichao Zhuang ◽  
Xiaowu Zhang ◽  
Huei Peng ◽  
Liangmo Wang
Keyword(s):  
Design Space ◽  
Planetary Gear ◽  
Optimization Method ◽  
Exhaustive Search ◽  
Combination Method ◽  
Hybrid Powertrain ◽  
Operating Modes ◽  
Hybrid Powertrains ◽  
Power Split ◽  
Computationally Intensive

In recent years, clutches have been used to create multi-mode power-split hybrid electric vehicles (HEVs). Designing an HEV for optimal performance is computationally intensive because of the enormous design space. For single planetary gear (PG) or a double-PG hybrid powertrains, the design with the best fuel economy and launching performance can be identified through exhaustive search. Exhaustive search for a hybrid powertrain with 3PGs is computationally expensive, because of the astronomical number of design candidates. To address the design problem with extremely large design space, a rapid structure optimization method is proposed, which is based on combining different operating modes. A case study compares several different schemes against the results of the exhaustive search. The results show that the proposed mode combination method can identify almost 90% of the best designs. The proposed method shows great potential when applied to hybrid systems with three or more PGs.

scholarly journals Configuration optimization for improving fuel efficiency of power split hybrid powertrains with a single planetary gear

2018 ◽  
Vol 214 ◽  
pp. 103-116 ◽  
Author(s):  
Huanxin Pei ◽  
Xiaosong Hu ◽  
Yalian Yang ◽  
Xiaolin Tang ◽  
Cong Hou ◽  
...  
Keyword(s):  
Fuel Efficiency ◽  
Planetary Gear ◽  
Configuration Optimization ◽  
Hybrid Powertrains ◽  
Power Split

scholarly journals Simulation Study of Advanced Variable Displacement Engine Coupled to Power-Split Hydraulic Hybrid Powertrain

2009 ◽  
Author(s):  
Fernando Tavares ◽  
Rajit Johri ◽  
Zoran Filipi
Keyword(s):  
Hybrid Powertrain ◽  
Cylinder Deactivation ◽  
Integrated Simulation ◽  
Engine Model ◽  
Hydraulic Hybrid ◽  
Wide Range ◽  
Power Split ◽  
Variable Displacement ◽  
Mode Transitions ◽  
And Control

The simulation-based investigation of the variable displacement engine is motivated by a desire to enable unthrottled operation at part load, and hence eliminate pumping losses. The mechanism modeled in this work is derived from a Hefley engine concept. Other salient features of the proposed engine are turbocharging and cylinder deactivation. The cylinder deactivation combined with variable displacement further expands the range of unthrottled operation, while turbocharging increases the power density of the engine and allows downsizing without the loss of performance. While the proposed variable displacement turbocharged engine (VDTCE) concept enables operations in a very wide range, running near idle is impractical. Therefore, the VDTCE is integrated with a hybrid powertrain allowing flexibility in operating the engine, elimination of idling and mitigation of possible issues with engine transients and mode transitions. The engine model is developed in AMESim using physical principles and 1-D gas dynamics. A predictive model of the power-split hydraulic hybrid driveline is created in SIMULINK, thus facilitating integration with the engine. The integrated simulation tool is utilized to address design and control issues, before determining the fuel economy potential of the powertrain comprising a VDTCE engine and a hydraulic hybrid driveline.

Loaded Tooth Contact Analysis of Power-Split Gear Drives Considering Shaft Deformation and Assembly Errors

2015 ◽  
Author(s):  
Siang-Yu Ye ◽  
Shyi-Jeng Tsai
Keyword(s):  
Power Transmission ◽  
Planetary Gear ◽  
Load Sharing ◽  
Contact Analysis ◽  
Influence Coefficient ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Power Split ◽  
Loaded Tooth Contact Analysis ◽  
Compact Design

The power-split gear mechanisms is widely applied in power transmission because of the advantages of compact design, lighter weight and high power density. The load sharing and the load distribution are the important performance issues while designing the power split mechanisms. The paper propose a computerized approach based on the influence coefficient method for loaded tooth contact analysis of such the gear transmission. Not only the load sharing of the multiple contact tooth pairs and the loaded transmission errors, but also the distributed contact stresses and the corresponding contact patterns on all the engaged tooth flanks can be calculated by using the proposed LTCA approach. Some analysis results are also discussed with a study case of the first planetary stage of a compound cycloid planetary gear drive.

Optimal design of power-split hybrid tracked vehicles using two planetary gears

2018 ◽  
Vol 77 (1/2) ◽  
pp. 43
Author(s):  
Zhaobo Qin ◽  
Yugong Luo ◽  
Keqiang Li ◽  
Ziheng Pan ◽  
Huei Peng
Keyword(s):  
Optimal Design ◽  
Planetary Gears ◽  
Tracked Vehicles ◽  
Power Split

Robust optimisation of dynamic and NVH characteristics for compound power-split hybrid transmission

2019 ◽  
Vol 233 (4) ◽  
pp. 817-826
Author(s):  
Han Guo ◽  
Jianwu Zhang ◽  
Haisheng Yu
Keyword(s):  
Acoustic Radiation ◽  
Radiation Power ◽  
Numerical Procedure ◽  
Planetary Gear ◽  
Gear Train ◽  
Optimal Control Strategy ◽  
Numerical Predictions ◽  
Power Split ◽  
Hybrid Transmission ◽  
Noise Vibration

In this paper, vibro-acoustic characteristics of a power-split hybrid transmission including a compound planetary gear set are investigated by numerical procedure and refined system dynamics modelling. For validation of the numerical predictions, bench tests are performed for dynamic and acoustic responses of the hybrid transmission, contribution rates of acoustic radiation power induced due to the planetary gears, support bearings, transmission shafts and the gearbox housing are estimated. In improving the noise, vibration and harshness (NVH) performance of the transmission during hybrid vehicle acceleration, traction torques of the motors against the planetary gear parametric resonance are formulated and an optimal control strategy is proposed. By real road NVH test results acquired on board of the midsize hybrid car, it is demonstrated that a significant reduction of the planetary gear whine noise is achieved. As a result, numerical approaches applied to establish relationships between torques of the two traction motors and parametric excitations of the compound planetary gear train are experimentally validated.

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