Vanja Ranogajec

Vanja Ranogajec
OMCO Croatia

PhD

About

15
Publications
853
Reads
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135
Citations
Education
March 2013 - July 2014
University of Zagreb
Field of study
  • Mechatronics and robotics
September 2009 - February 2013
University of Zagreb
Field of study
  • Mechatronics and robotics

Publications

Publications (15)
Article
The paper presents a detailed numerical and algebraic analysis of potential for improving the step ratio automatic transmission (AT) upshift performance by means of modulating the off-going clutch during the inertia phase. The numerical analysis is based on Pareto optimal frontiers obtained by using the previously developed methods for AT shift con...
Article
In advanced automatic transmissions (ATs) with a high number of gears, a multi-step, double-transition downshifts (DTS) occur, in which typically two pairs of clutches change their state. This paper proposes different definitions of piecewise linear control profiles for performing such downshifts, which are determined based on insights gained by ut...
Conference Paper
New generation of torque converter automatic transmissions (ATs) include a large number of forward gears for improved fuel economy and vehicle performance. In order to realize a mass- and packaging-efficient ATs, designers are turning to complex gearbox structures that may be characterized by prominent inertia cross-coupling. The inertia coupling i...
Conference Paper
A new generation of torque converter automatic transmissions (ATs) includes an increased number of forward gears, in order to allow for additional fuel efficiency gains and emission reduction. With the aim of providing good drivability, advanced shifts methods are introduced in such transmissions, including double-transition shifts (DTSs). Since DT...
Article
In the new generation of torque converter automatic transmissions (ATs), characterized by a high number of gears, multi-step gear shifts may be executed frequently in order to improve the driving performance. They include double- transition shifts (DTSs), which require close coordination between multiple control inputs (e.g. torque capacities of fo...
Conference Paper
Determining shift scheduling maps plays important role in the development of both conventional and hybrid automatic transmission powertrains. In order to meet ever demanding requirements on fuel economy and performance, modern optimisation methods are commonly used for generating optimal shift scheduling maps. This study focuses on the development...
Article
In order to meet ever demanding requirements on powertrain efficiency and performance improvement, new concepts of automatic transmissions have been introduced recently, including electrified conventional transmissions. A representative example of electrified transmission system is a hybrid dual clutch transmission. The paper presents an optimisati...
Article
The ever-present pressure on shortening the development cycle of transmission systems requires development of numerical methods and tools that would speed up those processes. This paper contributes to the field by proposing a method for automated generation of the full-order automatic transmission (AT) model from a bond graph model that directly re...
Article
New generation of torque converter automatic transmissions (AT) include a large number of gears for improved fuel economy and performance. Control requirements for such a transmission become more demanding, which calls for the development of new shift control optimization tools. A pseudospectral collocation method is used in the paper to optimize A...
Article
New generation of torque converter automatic transmissions (AT) includes a large number of gears for improved fuel economy and vehicle performance, which leads to exponentially increasing number of shift types and shift events. In order to facilitate various numerical/simulation analyses of AT dynamics, shift control optimization, and control strat...
Conference Paper
In order to improve performance of automatic transmissions (ATs), new concepts of ATs are introduced, such as torque converter ATs with a large number of gears and hybrid dual clutch transmission (HDCT). The paper first presents a powertrain model of an advanced 10-speed torque converter AT, and outlines the use of a modern control trajectory optim...
Article
New generation of torque converter automatic transmissions (AT) include a large number of gears for improved fuel economy. Control requirements for such transmissions become more demanding, which calls for the development of new shift optimization and analysis tools. This paper presents two contributions to the field of transmission dynamics analys...
Conference Paper
The paper first describes the previously proposed control strategy for a series-parallel hybrid electric vehicle (HEV) and an Extended Range Electric Vehicle (EREV), which combines a heuristic RB controller with an instantaneous optimisation strategy. The optimisation algorithm is based on the equivalent consumption minimisation strategy (ECMS), wh...

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