This article has described the development of an electric power steering for light commercial vehicles. It has been shown that the energy saving, in comparison with the hydraulic power steering currently in use, is a significant 0.6 litres per 100 km. An EPS can thus both make a contribution to achieving the emission specifications that are being placed on OEMs, and can offer significantly reduced fuel consumption to end users. The EPS system design has been described on the basis of existing components for passenger car steering systems, and necessary changes have been identified. The measurement of the electric power steering carried out in the vehicle confirms that the power capability of present hydraulic steering systems is achieved. The EPS that has been developed also offers many impressive options for actively affecting steering feeling. In addition to the basic software functions, such as compensation for friction and inertia, a particular contribution is made to improving the steering feel of vehicles in this sector by the speed-dependent power support and the active steering wheel return. In order to demonstrate the advantages offered by an electric power steering to the aspects of driving safety and driving comfort, additional functions, such as understeer and oversteer assistance were implemented with this steering system. Thus, if the driver steers too sharply, i.e. steering past the point of maximum lateral steering force at the road wheel, this is resisted by an opposing torque from the EPS. On the other hand, if the vehicle's rear threatens to break away, in other words the vehicle oversteers, an additional steering torque helps the driver to counter-steer and stabilise the vehicle. It is important for these functions that the application of the superimposed steering torque interacts with the driver and can be overridden by the driver at any time. Accordingly, the maximum additional torque is limited by the EPS. A frequent cause of accidents, particularly during cross-country driving and on the motorways, is leaving the traffic lane unintentionally. Lane Departure Warning is a steering function that can contribute significantly to reducing accidents of this sort, and in that way actively increasing the driving safety. For this purpose, the test vehicle was fitted with a camera system, from Robert Bosch GmbH, to determine the position of the vehicle within the lanes. When the vehicle threatens to leave the lane, the driver is warned of the danger by an opposing torque at the steering wheel, and encouraged to correct the steering. If, however, the driver deliberately steers close to the edge of the lane for a certain time, the opposing torque is taken away. Continuous lane monitoring (Lane Keeping Assistance) is also made possible by the EPS, making it easier for the driver to guide the vehicle. In contrast to the lane departure warning assistant, which only acts when the vehicle is about to leave the lane, this function assists the driver continuously when the vehicle is moving above a certain speed. Through a continuous superimposed steering torque, the driver is shown the ideal line to take within the lane, thus improving the safety as well as the comfort of driving.


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    Titel :

    Electric power steering for light commercial vehicles


    Beteiligte:
    Heger, Markus (Autor:in) / Gaedke, Alexander (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    15 Seiten, 6 Bilder, 3 Tabellen, 5 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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