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Automotive Product Finder Magazine | Continental speaks on efficient electromobility at 32nd Electric Vehicle Symposium

Continental speaks on efficient electromobility at 32nd Electric Vehicle Symposium

Growth of automobile industry expected to generate huge demand
Mahindra new global SUV project codenamed W601 to be branded XUV700

News  /   May

Lyon, May 21, 2019: At the 32nd Electric Vehicle Symposium (EVS32, 20 May-22 May) at Lyon (France) experts from the Continental powertrain business gave presentations on innovations for more efficient electromobility. Thermal management on a system level, for instance, can help to achieve a considerably longer vehicle range despite cold or hot ambient temperatures. A research vehicle, based on an existing mid-size EV, is exhibited by Continental for the first time. Furthermore, solutions for fuel cell vehicles can provide an answer to long distance driving, especially for larger and commercial vehicles. Continental now utilizes Artificial Intelligence (AI) and the principle of swarm intelligence to design optimum fuel cell systems. The demand for higher power density in electronics, with greater power levels and more functions integrated into ever smaller packages will only increase, particularly for smaller EVs and plug-in hybrids. New semiconductor materials like gallium nitride (GaN) are potential solutions which enable such high integration, for example in bi-directional on-board chargers (OBC).

“Electric vehicles, hybrids and fuel cell vehicles will all be an integral part of the future mobility mix. As they offer a new experience to drivers, it is important to get the vehicle practicality right. This extends far beyond driving. To make electromobility a success we must also address the trickier bits, which can spoil the fun of driving, if left unattended. Thermal management and efficient charging rank high on that list because they can add to the usability of driving an EV,” said Stephan Rebhan, Head of Technology & Innovation Powertrain.

Making an EV more than a ‘fair-weather captain’

Every proud new EV owner is in for an eye opener when the first winter season approaches in the northern hemisphere: At below 0°C temperatures, the remaining range of the vehicle can be much smaller than at 20°C. In the interest of usability, it is important to reduce this temperature-induced loss to a minimum. At Lyon, Continental showed solutions to this challenge.

The thermal management research vehicle is equipped with specifically developed multi-port Coolant Flow Control Valves (CFCVs), coolant pumps and the newly developed Electro-Thermal Recuperator (ETR) or smart heater. Working together, these components harvest heat and energy where it originates in the vehicle and transport it to places where it is useful. By doing that, the energy demand from the battery is reduced which increases range. Depending on the temperature level of core components such as the battery, the heat flow can be flexibly re-directed as needed. The smart heater, for instance, can help to either heat up the cabin or the battery when it is too cold for the battery to accept electric energy from recuperation (regenerative braking). For that purpose, the smart heater will turn electricity into heat that is available for appropriate use. “In an EV, both human and machine want to be in their comfort zone. A car that is equipped with our smart heater, for instance, can achieve the comfort zone in a third of the time of a model without smart heater,” Rebhan said.

Gallium nitride, due to its lower conduction and switching losses, is a compelling technology for power electronics. For example, GaN in a bi-directional, air-cooled OBC enables charging efficiency of 95 per cent, thus reducing charging times and increasing overall energy efficiency, which in turn improves the practicality of electrified vehicles.

Artificial Intelligence speeds up fuel cell system design

A fuel cell powertrain is rather complex to design. It consists of two electrochemical power sources (i.e the fuel cell and battery) which are connected via at least one DC/DC link to the inverter and the electric motor. To get the maximum efficiency out of this powertrain, one needs to find the best operating strategy and power split between FC and battery. The powertrain division is using AI and Pontryagin's Minimum Principle (PMP) optimisation algorithms to compute the optimum fuel cell system and powertrain design for a known drive cycle. By harnessing its AI and swarm intelligence know-how the fuel cell experts were able to lower the energy losses in the battery-DC/DC link by around 3.5 per cent, through finding and applying intelligent control principles.

Tags Cloud
  • 32Nd Electric Vehicle Symposium
  • EV
  • Continental
  • Electromobility
  • Plug-In Hybrids
  • ETR
  • CFCV
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