DSD to present alternative EV transmission strategies at CTI Shanghai Symposium

Relative benefits of single or multi-speed to be compared to direct drive 

Leamington Spa, UK, 18 August 2016 – As electric vehicle (EV) popularity increases, there is much debate over whether to use a single-speed, multi-speed or no transmission at all. At the 5th annual CTI Symposium in Shanghai (21-23 Sept) driveline engineering specialist Drive System Design (DSD) will help delegates understand how and when an electric vehicle can benefit from including a transmission in the driveline.

In a presentation entitled ‘EV Transmissions: Lessons Learnt’, DSD’s Technical Director, Alex Tylee-Birdsall, will share some of the company’s experience of transmission and driveline applications on a number of EV projects. The benefits and drawbacks of each solution will be reviewed against the vehicle attributes required and insight provided into key issues, such as efficiency and NVH.

“There is no ‘one-size-fits-all’ solution,” explained Tylee-Birdsall. “Individual vehicles have different priorities, such as interior package space, performance or range; the order of these priorities determines the optimum transmission arrangement. An autonomous city ‘pod’ can be effectively powered by wheel hub motors; a modest vehicle might use a single speed reduction of around 10:1; a more demanding application, such as a commercial vehicle or a performance car, easily justifies the use of a more sophisticated transmission.”

DSD’s presentation will quantify the advantages of introducing a geared transmission, in terms of torque availability, motor efficiency and vehicle speed, while outlining the precautions required for a successful application. In particular, the presentation will show how techniques developed by DSD can eliminate potential NVH issues and how the company’s powershift expertise is used to avoid torque interruption during gear shifts.

The paper will be presented on September 23rd in the Transmission and Drivetrain NVH Session at 16:40pm at the Marriot Hotel Parkview, Shanghai.

About DSD
Drive System Design (DSD) is an award winning engineering consultancy specialising in the engineering, development and control of transmission and future driveline systems.

The company’s staff has experience working with vehicle manufacturers and Tier 1s around the world, designing new technologies and solving problems to make their products more competitive. It has the engineering, test, analysis and project management skills necessary to deliver projects to demanding timescales. Working closely with its customers through technical centres in Europe and North America, DSD is recognised as a world leading expert in driveline refinement, efficiency improvement and hybrid and electric vehicle transmissions.


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