Performance Study of Vane Pump Power Split Transmission for a Highway Vehicle

2015 ◽  
Author(s):  
Biswaranjan Mohanty ◽  
Feng Wang ◽  
Kim A. Stelson
Keyword(s):  
Pump Power ◽  
Continuous Variable ◽  
Control Flow ◽  
Output Shaft ◽  
Performance Study ◽  
Hydraulic Motor ◽  
Vane Pump ◽  
Engine Operation ◽  
Power Split ◽  
Variable Displacement

A novel Vane Pump Power Split Transmission (VPPST), applied to a class 1 pickup truck, is demonstrated in this paper. The VPPST, a power split hydraulic transmission consists of Vane Pump Power Split Unit (VPSU) and a variable displacement hydraulic motor. The VPSU is a double acting vane pump with a floating ring. The floating ring is coupled to the output shaft, which is connected to the drive shaft. The input shaft of the VPSU is coupled to the engine. The control flow of the VPSU is fed to a variable displacement motor mounted on the VPSU output shaft. The transmission ratio is adjusted by controlling the displacement of the variable motor. The resulting continuous variable transmission allows for optimum engine operation by decoupling the engine speed from the drive speed. The transmission also has an integral clutch that allows de-clutching the engine from the drive train by retracting the vanes of the VPSU. In this paper, a quasi-static simulation approach is used to study the performance of the transmission.

A Three-Dimensional CFD Methodology to Study Vane-Ring and Vane-Under-Vane Interactions of a Vane Pump Power Split Transmission

2016 ◽  
Author(s):  
Emma Frosina ◽  
Adolfo Senatore ◽  
Dario Buono ◽  
Kim A. Stelson ◽  
Feng Wang ◽  
...  
Keyword(s):  
Pump Power ◽  
Model Building ◽  
Three Dimensional ◽  
Output Shaft ◽  
University Of Minnesota ◽  
Hydraulic Motor ◽  
Vane Pump ◽  
Input Shaft ◽  
Power Split ◽  
The University

This paper presents a study of a novel vane pump power split transmission (VPPST). The transmission incorporates a new component, the Vane Power Split Unit (VPSU). The VPSU is a double-acting vane pump with a floating ring where the input shaft is connected to the engine and the floating ring is connected to the output shaft. The VPSU generates hydraulic oil flow at a rate proportional to the difference in angular velocities between the input and output shafts. This flow enters a hydraulic motor mounted to the output shaft. The vane pump power split transmission (VPPST) is a combination of the double-acting vane pump (VPSU) and the hydraulic motor directly connected to the pump. A CFD model of the VPSU has been created to better understand its performance. The model uses the three-dimensional CFD commercial code PumpLinx®, developed by Simerics® Inc. Thanks to collaboration with the code developers, the model is able to predict the complex fluid dynamics in the pockets in the rotor into which the vanes retract. These pockets are referred to as under-vane volumes. The rotor of the vane pump, in fact, has several internal channels that connect the pumping chambers between the vanes to the under-vane volumes. The combination of the vanes and the internal ducts and volumes of the under-vanes have been modelled as dynamic “valves” that rotate with the rotor. In this way the radial movements of the vanes are computed as a part of the simulation, based on the pressures due to the compression of the volumes on the inner diameter side of the vanes. The study is a result of collaboration between the University of Minnesota and the University of Naples “Federico II” research groups and the code developers of Simerics® Inc. The universities and Simerics® Inc. have all been involved in this project, working in close cooperation for the model building and simulations.

A Novel Pressure-Controlled Hydro-Mechanical Transmission

2014 ◽  
Author(s):  
Feng Wang ◽  
Kim A. Stelson
Keyword(s):  
Fundamental Principle ◽  
Transmission Efficiency ◽  
Control Flow ◽  
Drive System ◽  
Output Shaft ◽  
Mechanical Transmission ◽  
Hydraulic Motor ◽  
Vane Pump ◽  
Variable Displacement ◽  
Pressure Controlled

A novel pressure-controlled hydro-mechanical transmission (PHMT) is studied in this paper. The PHMT consists of a pressure-controlled hydraulic transmission (PCT) and a variable displacement hydraulic motor. The PCT functions like a conventional hydrostatic transmission (HST) but has a different form. It uses a double-acting vane pump with a floating ring. By coupling the floating ring to an output shaft, the vane pump becomes a hydraulic transmission. The PCT combines the pumping and motoring functions in one unit, making it much simpler than a conventional HST. By controlling the pressure in the PCT, the output shaft torque and speed can be adjusted. By feeding the PCT control flow to a variable displacement motor coupled to the PCT output shaft, a PHMT is constituted. In this paper, the fundamental principle of the PHMT is studied. To demonstrate its advantage, the PHMT is applied to a fan drive system and the transmission efficiency is compared to a conventional HST. Preliminary experimental results show that the input power of the fan drive system with a PHMT is lower than that with an HST given the same output fan speed and torque.

Vane Pump Power Split Transmission: Three Dimensional Computational Fluid Dynamics Modeling

2015 ◽  
Author(s):  
Emma Frosina ◽  
Adolfo Senatore ◽  
Dario Buono ◽  
Kim A. Stelson ◽  
Feng Wang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Pump Power ◽  
Three Dimensional ◽  
University Of Minnesota ◽  
Dynamics Modeling ◽  
Vane Pump ◽  
Hydraulic Test ◽  
Pump Operation ◽  
Power Split ◽  
The University

A three dimensional CFD analysis of a novel vane pump power split transmission is studied in this paper. The model was built using PumpLinx®, a three-dimensional CFD commercial code developed by Simerics Inc.® The Mathers Hydraulics® vane pump is a double-acting vane pump with a floating ring. By coupling the floating ring to an output shaft, the vane pump becomes a hydrostatic transmission. The focus of this activity is the optimization of the vane pump analyzing the internal fluid dynamics of each part during the pump operation and redesign. The study is a result of collaboration between the University of Minnesota and the University of Naples “Federico II” research groups. The universities involved in this project worked in close cooperation on these simulations. A prototype pump will be tested on a hydraulic test bench at the University of Minnesota, and the experimental data will be used to validate the simulation model.

A Novel Digitalized Hydrostatic Drive Solution for Modern Wind Turbine

2017 ◽  
Author(s):  
Jincheng Chen ◽  
Feng Wang ◽  
Kim A. Stelson
Keyword(s):  
Wind Turbine ◽  
Cost Effective ◽  
Continuous Variable ◽  
Power Converter ◽  
Maintenance Cost ◽  
Hydraulic Motor ◽  
Hydrostatic Transmission ◽  
Wind Speeds ◽  
Cost Of Energy ◽  
Variable Displacement

Gearbox is a concern in modern wind turbines, increasing the maintenance cost and therefore the cost of energy (COE). A hydrostatic transmission (HST) improves the turbine drivetrain reliability by using slightly compressible mineral oil as the working medium rather than a rigid gearbox. An HST eliminates the power converter since it is a continuous variable transmission (CVT), making the turbine simpler and more cost effective. The turbine operates below the rated wind speed for a considerable time in a year, making the variable hydraulic motor run at partial displacement for the most common configuration of a hydrostatic wind turbine, a fixed displacement pump and a variable displacement motor. This results in low drivetrain efficiency. Moreover, large variable displacement motors for megawatt turbine are commercially unavailable. A digitalized hydrostatic drive for a modern wind turbine is proposed to improve the drivetrain efficiency at low wind speeds. The digital coding method for hydrostatic wind turbine is studied. A dynamic simulation model of the digitalized hydrostatic (dHST) wind turbine has been developed in Simulink. A widely used efficiency model for the hydrostatic pump and motors is used in the simulation to make the study practical. The proposed digitalized hydrostatic solution has been compared with a conventional hydrostatic solution. Simulation results show the benefits of digitalized hydrostatic transmission over conventional hydrostatic transmission in drivetrain efficiency, system complexity and cost.

Modeling and Experimental Study of a Novel Power Split Hydraulic Transmission

2018 ◽  
Author(s):  
Haoxiang Zhang ◽  
Feng Wang ◽  
Bing Xu
Keyword(s):  
Flow Rate ◽  
Experimental Studies ◽  
Friction Torque ◽  
Output Shaft ◽  
Mechanical Power ◽  
Vane Pump ◽  
Input Shaft ◽  
Power Split ◽  
Outlet Flow ◽  
Shaft Torque

The characteristics of a novel power split hydraulic transmission are studied in this paper. The new hydraulic transmission is built from a balanced vane pump with a floating ring. By coupling the floating ring to the output shaft, it becomes a hydraulic transmission, converting the mechanical power on the input shaft into the hydraulic power at the outlet and the mechanical power on the output shaft. By controlling the pressure at the outlet (control pressure), the power ratio transferred through mechanical and hydraulic path can be adjusted. One important feature of the new transmission is that the internal friction torque of the transmission, e.g., friction torque between vane tips and floating ring, helps to drive the output shaft whereas is wasted and turned into heat in a conventional vane pump. This increases the transfer efficiency from input shaft to output shaft. In this study, the characteristics of the input shaft torque, output shaft torque and the outlet flow rate are investigated through experimental studies. Results show that the shaft torques and the outlet flow rate are functions of control pressure and differential shaft speed. The mathematical models have been developed from the analytical and experimental results. The study provides a comprehensive understanding of the new transmission.

A New Power Train System of Electric Hybrid Vehicle

2013 ◽  
Vol 321-324 ◽  
pp. 1558-1561 ◽  
Author(s):  
Ren Guang Wang ◽  
Zhen Lin Yang ◽  
Lin Tao Zhang ◽  
Chao Yu ◽  
Guang Kui Shi ◽  
...  
Keyword(s):  
Planetary Gear ◽  
Coupling Mechanism ◽  
Hydraulic Motor ◽  
Power Train ◽  
Electric Generator ◽  
Power Split ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Hydraulic Accumulator ◽  
Train System

A new hybrid power train using variable displacement pump/motor was developed for electric vehicle. It mainly includes engine, brake, clutch, variable displacement pump/motor, hydraulic accumulator, output gear, planetary gear set, controller. The planetary gear set, brake, clutch, output gear, power output shaft are integrated to form power split and coupling mechanism. In this new power train, the hydraulic variable displacement pump/motor is used instead of the electric generator/motor with different operation modes, which are pure hydraulic motor driving, pure engine driving, parallel hybrid driving, and compound hybrid driving.

An Energy Efficient Power-Split Hybrid Transmission System to Drive Hydraulic Implements in Construction Machines

2021 ◽  
Author(s):  
Mateus Bertolin ◽  
Andrea Vacca
Keyword(s):  
Fuel Consumption ◽  
Pollutant Emissions ◽  
Engine Operation ◽  
Construction Machinery ◽  
Load Sensing ◽  
Parallel Hybrid ◽  
Power Split ◽  
Truck Loading ◽  
Hybrid Transmission ◽  
Efficient Power

Abstract This paper proposes a novel hybrid power-split transmission to drive hydraulic implements in construction machinery. The highly efficient power-split hybrid transmission is combined with displacement controlled (DC) actuators to eliminate throttling losses within the hydraulic system and achieve higher fuel savings. The architecture design, sizing and power management are addressed. Simulation results considering a realistic truck-loading cycle on a mini excavator demonstrate the feasibility of the idea. A systematic comparison between the proposed system and the previously developed series-parallel hybrid is also carried out. The paper compares engine operation and fuel consumption of the previously mentioned hybrid system with the original non-hybrid load-sensing machine. It is shown that by implementing an efficient engine operation control, the proposed system can achieve up to 60.2% improvement in fuel consumption when compared to the original machine and consume 11.8% less than the previously developed series-parallel hybrid with DC actuation. Other advantages of the proposed solution include a much steadier engine operation, which opens to the possibility of designing an engine for optimal consumption and emissions at a single operating point as well as greatly reduce pollutant emissions. A steadier prime mover operation should also benefit fully electric machines, as the battery would not be stressed with heavy transients.

Support vector regression methodology for wind turbine reaction torque prediction with power-split hydrostatic continuous variable transmission

Energy ◽  
2014 ◽  
Vol 67 ◽  
pp. 623-630 ◽  
Author(s):  
Shahaboddin Shamshirband ◽  
Dalibor Petković ◽  
Amineh Amini ◽  
Nor Badrul Anuar ◽  
Vlastimir Nikolić ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Support Vector Regression ◽  
Continuous Variable ◽  
Support Vector ◽  
Continuous Variable Transmission ◽  
Power Split ◽  
Variable Transmission ◽  
Reaction Torque

Investigation on the Energy Management Strategy for Hydraulic Hybrid Wheel Loaders

2013 ◽  
Author(s):  
Feng Wang ◽  
Mohd Azrin Mohd Zulkefli ◽  
Zongxuan Sun ◽  
Kim A. Stelson
Keyword(s):  
Energy Management ◽  
Hydraulic System ◽  
Management Strategy ◽  
Energy Management Strategy ◽  
Road Vehicles ◽  
Engine Operation ◽  
Wheel Loader ◽  
Hydraulic Hybrid ◽  
Power Split ◽  
Wheel Loaders

Energy management strategies for a hydraulic hybrid wheel loader are studied in this paper. The architecture of the hydraulic hybrid wheel loader is first presented and the differences of the powertrain and the energy management system between on-road vehicles and wheel loaders are identified. Unlike the on-road vehicles where the engine only powers the drivetrain, the engine in a wheel loader powers both the drivetrain and the working hydraulic system. In a non-hybrid wheel loader, the two sub-systems interfere with each other since they share the same engine shaft. By using a power split drivetrain, it not only allows for optimal engine operation and regenerative braking, but also eliminates interferences between driving and working functions, which improve the productivity, fuel efficiency and operability of the wheel loader. An energy management strategy (EMS) based on dynamic programming (DP) is designed to optimize the operation of both the power split drivetrain and the working hydraulic system. A short loading cycle is selected as the duty cycle. The EMS based on DP is compared with a rule-based strategy through simulation.

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.

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