CVT-Based Full Hybrid Powertrain Offering High Efficiency at Lower Cost Punch Powertrain

Format:

Conference/Event

Author/Creator:

Debal, Debal, author.

Contributor:

Bervoets, Steven

Faid, Saphir

Tricoche, Laurent

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

In 2007 Punch Powertrain started the development of a fullhybrid powertrain concept based on its CVT. A performance andefficiency analysis proved that a post-configuration offered thebest solution. In parallel to the mechanical and electricaldevelopment an advanced, Matlab/Simulink® simulation system wasestablished. A robust powertrain strategy was developed andimplemented into the simulation system. Results show a potential of30% to 70% fuel efficiency improvement depending on the cycle (typeapproval and real-world cycles). A higher saving potential ispossible as a plug-inchesThe fuel efficiency improvement is reached while meeting otherimportant targets. First of all, the powertrain cost premium needsto match the saving. Next to keeping the transmission cost undercontrol the electric drive technology and the batteries arecornerstones of the powertrain development. A dedicated switchedreluctance electric motor/generator is developed at a partner.Switched reluctance combines high efficiency and dynamic behaviorwith a low cost potential. Special care has been taken to iron outsome drawbacks like torque ripple and noise. LiFePO₄ is thepreferred battery chemistry. It offers the best combination ofperformance and cost without the safety risk of classic lithium ionor polymer cells.Additionally, the powertrain size is very restricted. Thedevelopment team at Punch Powertrain managed to keep the powertrainlength, width and height within the size of the conventionalcounterpart. This enables a straightforward integration into mostengine bays. As such, Punch Powertrain offers a fairly easyhybridization path for conventional cars.During the development project the search for auxiliarycomponents was a continuous effort to find affordable componentsthat do not jeopardize the development targets for mass, space andefficiency. For most components a "hybrid compatible"solution was found. The hydraulic pump for the transmission was oneexception. A parallel development was initiated during theproject.A demonstrator vehicle is being built to drive as EV mid 2009and as full hybrid by the end of 2009. In parallel a secondpowertrain will undergo a series of test on bench to validate andoptimize the powertrain strategy. By exchanging powertrain controlmodifications between the demonstrator and the test benchdriveability will be guaranteed while further optimizing the fueleconomy. Experience from both test platforms will be used in theindustrialization project. This project will result in aproduction-ready powertrain design as well as a flexible productionsystem for small to medium production series

Notes:

Vendor supplied data

Publisher Number:

2010-01-1313

Access Restriction:

Restricted for use by site license