Siemens VDO Automotive, has begun to think about the time after the current hybrid vehicle. Siemens VDO consider the electric motor to be the actual long-term drive solution that will meet even the most stringent future emissions regulations. So the supplier is expecting drive-by-wire automobiles, based on its eCorner technology, to become a common sight on the roads within 15 years. However, purely electric propulsion is just one aspect of the concept. This new type of drivetrain also offers a technical platform for a high level of driver assistance functions. Siemens is thinking of uncooled wheel hub motors with 150Nm torque each. In a four-wheel drive car a format the supplier favours because it has the broadest control and driver assistance possibilities, this would offer the driver 600Nm torque. Completely replacing the combustion engine would be a big change indeed and big changes tend to happen in steps. On the way to the eCorner Siemens VDO foresees three steps: Individual sub-modules will mark the beginning of by-wire-technology. Siemens VDO sees the electronic wedge brake (EWB) as the first big step. The completely electric braking system will open the way for other elements to be integrated into the wheel in the second step of development, named the 'integrated corner module'. This level of partial integration or semi-by-wire is planned to include ABS sensors and buffer control devices in the wheel drive unit. The full by-wire level includes wheel hub drive, EWB, regenerative braking (generator braking), steer-by-wire and electric suspension. It is timed for the second decade of this century. This fully integrated eCorner will offer maximum flexibility to precisely control die dynamics of steering, acceleration and braking. So where does the electric energy for the 100Nm wheel hub motors come from? Very powerful battery packs for city mode-only cars and highly efficient fuel cells in the car underbody are a very likely energy source for long distance cars. It would also be possible to use a next generation combustion engine, fuelled with diesel or some future kind of sun-derived fuel. In this light the eCorner concept spans a whole range of potential drivetrain solutions ranging from an electric car to hybrids that replace the transmission-integrated electric motor by wheel hub motors. Switching from nickel metal hydride (NiMH) batteries to lithium-ion (Li-Ion) technology may mean doubling the battery capacity, but will this be enough? So the eCorner is more closely related to hybrid technology than it seems at first sight.


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    Titel :

    Integration is just around the corner


    Beteiligte:

    Erschienen in:

    Automotive Engineer ; Sep. ; 21-22


    Erscheinungsdatum :

    2006


    Format / Umfang :

    2 Seiten, 3 Bilder



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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