Intelligent control enables efficient assisted steering

Posted By : Barney Scott
Intelligent control enables efficient assisted steering

Subsidised by Germany's Federal Ministry for Education and Research (Bundesministerium Für Bildung und Forschung - BMBF), the Intelligent Assisted Steering System with Optimum Energy Efficiency for Electric Vehicles (e²-Lenk) project, jointly undertaken by the Karlsruhe Institute for Technology (KIT) and Schaeffler, focuses on a novel assisted steering concept.

In conventional vehicles, the internal combustion engine not only accelerates the car but also supplies on-board assistace systems with energy, such as the power assisted steering system, which reduces the strain on the driver at the wheel. In electric vehicles, this energy comes from the battery and also reduces the range as a result. In this research project, the steering system is assisted in an energy-efficient manner by intelligent control of the drive torques transmitted to the individual wheels. The project is being sponsored by BMBF with a budget of around €600,000 over 3 years and was started in January 2015.

“The assisted steering system would require less system components in an electric vehicle, this would mean savings in terms of weight and energy in an electric vehicle,” explained project managers Dr. Marcel Mayer, Schaeffler, and Dr. Michael Frey, KIT. “This would mean that an electric car would be cheaper and have a greater range.” Materials and production steps can be saved due to the potential optimisation of the design and weight.

The basic idea of the e²-Lenk project is simple: The wheels in an electric car will be driven individually by electric motors in contrast to a car with an internal combustion engine where all the wheels are provided with equal force. If the wheels on the left side transmit more drive torque to the road than those on the right side, this will result in acceleration of the vehicle to the right without the need to turn the front wheels or consume additional energy for steering. Tracked vehicles or quadrocopters steer using the same principle.

“Steering assistance can be provided while driving by means of an intelligent control system and suitable wheel suspension,” says engineer Mayer, Manager of the Automatic Driving Working Group, which is carrying out research as part of the collaborative research project SHARE (Schaeffler Hub for Automotive Research in E-Mobility) at KIT. “Only steering when stationary remains a challenge with conventional designs.”

“The assisted steering system is part of the drive train with our approach,” explains Frey, who is researching at KIT's Institute of Vehicle Systems Technology. Steering the front wheels is carried out without using additional energy. “We also want to significantly increase the quality of driving. Customer benefit, comfort, safety and reliability go hand in hand here.”

As part of the project, functional demonstrators are being built, with which the concepts can be validated and optimised in experiments. It is also planned to implement the system in last year's Formula Student racing car KIT built by the university group KA-RaceIng with the participation of the students.

e²-Lenk is the first publicly subsidised joint project as part of the collaborative re-search project SHARE at KIT between Schaeffler Technologies and KIT. This joint project is being managed at KIT's East Campus in a joint project management office run by SHARE at KIT and the Institute of Vehicle Systems Technology (FAST).

Schaeffler and KIT are partners in the Leading Edge Cluster Electric Mobility South-West (ESW), which connects over 80 stakeholders from science and economics in the region Karlsruhe – Mannheim – Stuttgart – Ulm. The cluster strategy of the ESW cluster aims to achieve intensive regional collaboration in the field of electric mobility by means of new approaches and forms of cooperation. As a result, knowledge is developed, consolidated and ultimately advantages are achieved in international competition.

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