scholarly journals Verifying the methodology for speed of ratio changes of continuously variable transmission of a hybrid drivetrain

2018 ◽  
Vol 19 (12) ◽  
pp. 611-614
Author(s):  
Bartosz Radzymiński ◽  
Jarosław Goszczak
Keyword(s):  
Energy Source ◽  
Mechanical Energy ◽  
Continuously Variable Transmission ◽  
Test Stand ◽  
Drive System ◽  
Hybrid Drive ◽  
Secondary Energy ◽  
Variable Transmission

The article presents a test stand used to check the possibility of using a series-produced JATCO CVT7 continuously variable transmission for operating a mechanical energy accumulator which is a secondary energy source of a prototype hybrid drive system.

scholarly journals Analysis of continuously variable transmission for flywheel energy storage systems in vehicular application

2014 ◽  
Vol 229 (2) ◽  
pp. 273-290 ◽  
Author(s):  
Aditya Dhand ◽  
Keith Pullen
Keyword(s):  
Energy Storage ◽  
High Speed ◽  
Power Flow ◽  
Mechanical Energy ◽  
Storage System ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Flywheel Energy Storage ◽  
Energy Storage Devices ◽  
Variable Transmission

Energy storage devices are an essential part of hybrid and electric vehicles. The most commonly used ones are batteries, ultra capacitors and high speed flywheels. Among these, the flywheel is the only device that keeps the energy stored in the same form as the moving vehicle, i.e. mechanical energy. In order to connect the flywheel with the vehicle drive line, a suitable means is needed which would allow the flywheel to vary its speed continuously, in other words a continuously variable transmission (CVT) is needed. To improve the efficiency and speed ratio range of the variators, a power spilt CVT (PSCVT) can be employed. This paper discusses the kinematics of PSCVT used to connect the flywheel to the driveline. A methodology describing the characteristic equations of speed ratio, power flow and efficiency of the PSCVT for various types including power recirculating and multi regime in both directions of power flow has been presented. An example of a PSCVT for a flywheel energy storage system (FESS) is computed using the derived equations and the results compared.

scholarly journals Verification of a method for determining the limit pressure peak in a mechanical continuously variable transmission

2018 ◽  
pp. 76-85
Author(s):  
Bratosz Radzymiński ◽  
Jaroslaw Goszczak
Keyword(s):  
Test Bench ◽  
Mechanical Energy ◽  
Continuously Variable Transmission ◽  
Test Results ◽  
Slip Point ◽  
Extensive Test ◽  
Variable Transmission ◽  
Pressure Peak ◽  
Ratio Change ◽  
Pressure Surge

This research concerns the continuously variable transmission that is to be used in a hybrid drivetrain with a mechanical energy accumulator as a secondary energy source. The purpose of this research is to verify the method of determining the pressure surge which ensures a fast but safe ratio change, from the perspective of the belt slip point of a continuously variable transmission. The obtained results allowed to decide on the design of a more extensive test bench enabling simulation of the load of a continuously variable transmission resulting from the acceleration and braking of the car's mass. In addition, the test results confirmed the possibility of regulating the pressures in two actuators to change the ratio and increase the speed of this change.

scholarly journals Optimal Control for a Hydraulic Recuperation System Using Endoreversible Thermodynamics

2021 ◽  
Vol 11 (11) ◽  
pp. 5001
Author(s):  
Robin Masser ◽  
Karl Heinz Hoffmann
Keyword(s):  
Optimal Control ◽  
Fuel Consumption ◽  
Energy Savings ◽  
Combustion Engine ◽  
Mechanical Energy ◽  
Hydraulic Systems ◽  
Commercial Vehicles ◽  
Hybrid Drive ◽  
Environmental Considerations ◽  
Onboard System

Energy savings in the traffic sector are of considerable importance for economic and environmental considerations. Recuperation of mechanical energy in commercial vehicles can contribute to this goal. One promising technology rests on hydraulic systems, in particular for trucks which use such system also for other purposes such as lifting cargo or operating a crane. In this work the potential for energy savings is analyzed for commercial vehicles with tipper bodies, as these already have a hydraulic onboard system. The recuperation system is modeled based on endoreversible thermodynamics, thus providing a framework in which realistic driving data can be incorporated. We further used dissipative engine setups for modeling both the hydraulic and combustion engine of the hybrid drive train in order to include realistic efficiency maps. As a result, reduction in fuel consumption of up to 26% as compared to a simple baseline recuperation strategy can be achieved with an optimized recuperation control.

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